Panasonic U-96ME1U9 Datasheet

Panasonic U-96ME1U9 Datasheet
2WAY VRF System
U-72ME1U9
U-72ME1U9E *
U-96ME1U9
U-96ME1U9E *
Model No.
Outdoor Unit
Class
Model Name
72
U-72ME1U9
U-72ME1U9E*
96
U-96ME1U9
U-96ME1U9E*
Refrigerant R410A is used in the outdoor units.
* Salt-Air Damage Resistant Specifications.
Indoor Units
Class
7
9
12
15
18
U1 4-Way Cassette
S-12MU1U6
S-18MU1U6
Y1 4-Way Cassette 60×60
S-12MY1U6
S-18MY1U6
D1 1-Way Cassette
19
24
36
48
54
S-24MU1U6 S-36MU1U6
S-07MD1U6 S-09MD1U6 S-12MD1U6
F1 Low Silhouette Ducted S-07MF1U6 S-09MF1U6 S-12MF1U6 S-15MF1U6 S-18MF1U6
S-24MF1U6 S-36MF1U6 S-48MF1U6 S-54MF1U6
M1 Slim Low Static Ducted S-07MM1U6 S-09MM1U6 S-12MM1U6 S-15MM1U6 S-18MM1U6
E1
High Static Pressure
Ducted
T1 Ceiling
S-36ME1U6 S-48ME1U6
S-12MT1U6
S-18MT1U6
S-24MT1U6
S-18MK1U6 S-19MS1U6** S-24MK1U6
K1 Wall Mounted
S-07MK1U6 S-09MK1U6 S-12MK1U6
P1 Floor Standing
S-07MP1U6 S-09MP1U6 S-12MP1U6 S-15MP1U6 S-18MP1U6
S-24MP1U6
S-07MR1U6 S-09MR1U6 S-12MR1U6 S-15MR1U6 S-18MR1U6
S-24MR1U6
R1
Concealed Floor
Standing
** Necessary to install the External Electronic Expansion Valve Kit (Optional:CZ-P56SVK1U)
85464849299000
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REFERENCE NO. SM830199-00
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IMPORTANT!
Please Read Before Starting
This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an
important part of your job to install or service the system so
it operates safely and efficiently.
For safe installation and trouble-free operation, you must:
Carefully read this instruction booklet before beginning.
Follow each installation or repair step exactly as shown.
Observe all local, state, and national electrical codes.
Pay close attention to all warning and caution notices
given in this manual.
This symbol refers to a hazard or
unsafe practice which can result
WARNING
in severe personal injury or death.
CAUTION
This symbol refers to a hazard or
unsafe practice which can result
in personal injury or product or
property damage.
When Installing…
Select an installation location which is rigid and strong
enough to support or hold the unit, and select a location
for easy maintenance.
…In a Room
Properly insulate any tubing run inside a room to prevent
“sweating” that can cause dripping and water damage to
walls and floors.
CAUTION
Keep the fire alarm and the air outlet at
least 5 feet away from the unit.
…In Moist or Uneven Locations
Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents
water damage and abnormal vibration.
…In an Area with High Winds
Securely anchor the outdoor unit down with bolts and a
metal frame. Provide a suitable air baffle.
If Necessary, Get Help
These instructions are all you need for most installation
sites and maintenance conditions. If you require help for a
special problem, contact our sales/service outlet or your
certified dealer for additional instructions.
…In a Snowy Area (for Heat Pump-type Systems)
Install the outdoor unit on a raised platform that is higher
than drifting snow. Provide snow vents.
When Connecting Refrigerant Tubing
In Case of Improper Installation
The manufacturer shall in no way be responsible for
improper installation or maintenance service, including failure to follow the instructions in this document.
• Ventilate the room well, in the event that is refrigerant
gas leaks during the installation. Be careful not to allow
contact of the refrigerant gas with a flame as this will
cause the generation of poisonous gas.
SPECIAL PRECAUTIONS
• Keep all tubing runs as short as possible.
WARNING
• Use the flare method for connecting tubing.
When Wiring
• Apply refrigerant lubricant to the matching surfaces of
the flare and union tubes before connecting them, then
tighten the nut with a torque wrench for a leak-free connection.
ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH.
ONLY A QUALIFIED, EXPERIENCED
ELECTRICIAN SHOULD ATTEMPT TO
WIRE THIS SYSTEM.
• Check carefully for leaks before starting the test run.
• Do not supply power to the unit until all wiring and tubing
are completed or reconnected and checked.
• Highly dangerous electrical voltages are used in this
system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and inadequate grounding can cause accidental injury or death.
• Ground the unit following local electrical codes.
• Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard.
• To prevent possible hazards from insulation failure,
the unit must be grounded.
When Transporting
WARNING
• When performing piping work
do not mix air except for specified refrigerant (R410A) in
refrigeration cycle. It causes
capacity down, and risk of
explosion and injury due to high
tension inside the refrigerant
cycle.
• Refrigerant gas leakage may
cause fire.
• Do not add or replace refrigerant
other than specified type.
It may cause product damage,
burst and injury etc.
• Do not leak refrigerant while piping work for an
installation or re-installation, and while repairing
refrigeration parts.
Handle liquid refrigerant carefully as it may cause
frostbite.
Be careful when picking up and moving the indoor and
outdoor units. Get a partner to help, and bend your knees
when lifting to reduce strain on your back. Sharp edges or
thin aluminum fins on the air conditioner can cut your fingers.
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When Servicing
CAUTION
• Turn the power OFF at the main power box (mains)
before opening the unit to check or repair electrical
parts and wiring.
• Ventilate any enclosed areas when
installing or testing the refrigeration
system. Escaped refrigerant gas, on
contact with fire or heat, can produce
dangerously toxic gas.
• Keep your fingers and clothing away from any moving
parts.
• Clean up the site after you finish, remembering to check
that no metal scraps or bits of wiring have been left
inside the unit being serviced.
WARNING
• Do not touch the air inlet or the
sharp aluminum fins of the
outdoor unit. You may get injured.
• Confirm after installation that no
refrigerant gas is leaking. If the gas
comes in contact with a burning stove,
gas water heater, electric room heater
or other heat source, it can cause the
generation of poisonous gas.
• Do not clean inside the indoor and
outdoor units by users. Engage
authorized dealer or specialist for
cleaning.
• In case of malfunction of this
appliance, do not repair by yourself.
Contact to the sales dealer or service
dealer for a repair.
Others
CAUTION
• Do not touch the air inlet or the
sharp aluminum fins of the
outdoor unit. You may get injured.
• Do not sit or step on the unit,
you may fall down accidentally.
• Do not stick any object into the
FAN CASE.
You may be injured and the
unit may be damaged.
Check of Density Limit
The room in which the air conditioner is to be
installed requires a design that in the event of refrigerant gas leaking out, its density will not exceed a set
limit.
The refrigerant (R410A), which is used in the air conditioner, is safe, without the toxicity or combustibility of ammonia,
and is not restricted by laws imposed to protect the ozone
layer. However, since it contains more than air, it poses the
risk of suffocation if its density should rise excessively. Suffocation from leakage of refrigerant is almost non-existent.
With the recent increase in the number of high density
buildings, however, the installation of multi air conditioner
systems is on the increase because of the need for effective use of floor space, individual control, energy conservation by curtailing heat and carrying power, etc.
Most importantly, the multi air conditioner system is able
to replenish a large amount of refrigerant compared to
conventional individual air conditioners. If a single unit of
the multi air conditioner system is to be installed in a
small room, select a suitable model and installation procedure so that if the refrigerant accidentally leaks out, its
density does not reach the limit (and in the event of an
emergency, measures can be made before injury can
occur).
ASHRAE and the International Mechanical Code of the
ICC as well as CSA provide guidance and define safeguards related to the use of refrigerants, all of which
define a Refrigerant Concentration Level (RCL) of 25
pounds per 1,000 cubic feet for R410A refrigerant.
For additional guidance and precautions related to
refrigerant safety, please refer to the following
documents:
International Mechanical Code 2009 (IMC-2009)
(or more recently revised)
ASHRAE 15
ASHRAE 34
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Precautions for Installation Using New Refrigerant
1. Care regarding tubing
1-1. Process tubing
Material: Use C1220 phosphorous deoxidized copper specified in JIS H3300 “Copper and Copper Alloy Seamless
Pipes and Tubes.”
For tubes of ø7/8"(ø22.22 mm) or larger, use C1220 T-1/2H material or H material, and do not bend the tubes.
Tubing size: Be sure to use the sizes indicated in the table below.
Use a tube cutter when cutting the tubing, and be sure to remove any flash. This also applies to distribution joints
(optional).
When bending tubing, use a bending radius that is 4 times the outer diameter of the tubing or larger.
CAUTION
Use sufficient care in handling the tubing. Seal the tubing ends with caps or tape to
prevent dirt, moisture, or other foreign substances from entering. These substances
can result in system malfunction.
Unit: in. (mm)
Material
Copper tube
O
Outer diameter
1/4 (6.35)
3/8 (9.52)
1/2 (12.7)
5/8 (15.88)
3/4 (19.05)
Wall thickness
1/32 (0.8)
1/32 (0.8)
1/32 (0.8)
5/128 (1.0)
over 5/128 (1.0)
Material
Copper tube
Unit: in. (mm)
1/2 H, H
Outer diameter
7/8 (22.22)
1 (25.4)
Wall thickness
5/128 (1.0)
5/128 (1.0)
1-1/8 (28.58) 1-1/4 (31.75)
5/128 (1.0)
3/64 (1.1)
1-1/2 (38.1)
1-5/8 (41.28)
over 3/64 (1.15) over 3/64 (1.20)
1-2. Prevent impurities including water, dust and oxide from entering the tubing. Impurities can cause R410A refrigerant deterioration and compressor defects. Due to the features of the refrigerant and refrigerating machine oil, the
prevention of water and other impurities becomes more important than ever.
2. Be sure to recharge the refrigerant only in liquid form.
2-1. Since R410A is a non-azeotrope, recharging the refrigerant in gas form can lower performance and cause defects
in the unit.
2-2. Since refrigerant composition changes and performance decreases when gas leaks, collect the remaining refrigerant and recharge the required total amount of new refrigerant after fixing the leak.
3. Different tools required
3-1. Tool specifications have been changed due to the characteristics of R410A.
Some tools for R22- and R407C-type refrigerant systems cannot be used.
Item
New R407C tools
tool? compatible
with R410A?
Manifold gauge
Remarks
Manifold gauge
Yes
No
Types of refrigerant, refrigerating machine
oil, and pressure gauge are different.
Charge hose
Yes
No
To resist higher pressure, material must be changed.
Vacuum pump
Yes
Yes
Use a conventional vacuum pump if it is equipped
with a check valve. If it has no check valve,
purchase and attach a vacuum pump adapter.
Leak detector
Yes
No
Leak detectors for CFC and HCFC that
react to chlorine do not function because
R410A contains no chlorine. Leak detector
for HFC134a can be used for R410A.
Flaring oil
Yes
No
Vacuum pump
Outlet
Inlet
For systems that use R22, apply mineral oil (Suniso oil)
to the flare nuts on the tubing to prevent refrigerant
leakage. For machines that use R407C or R410A, apply
synthetic oil (ether oil) to the flare nuts.
* Using tools for R22 and R407C and new tools for R410A together can cause defects.
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— CONTENTS —
Section 1:
CONTROL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
Section 2:
OUTDOOR UNIT REPAIR PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Section 3:
Removing Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Removing Electrical Component Box and Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Discharging Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Backup Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Recovering Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Checking for Leakage After Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Evacuating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Charging Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Pumping Out Refrigerant from Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
High and Low Pressure Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35
Replacing 4-way Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36
OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER . . . . . . . . . . . . 3-1
1.
2.
3.
4.
5.
6.
Section 4:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Selecting Outdoor Unit for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Special Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Other Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Operation of Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Outdoor Unit Electronic Thermostatic Expansion Valves [MOV1, MOV2 & MOV4] . . . . . 1-17
Outdoor Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Demand Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Indoor Unit Control of the Electronic Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
Rap Valve Kit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Indoor Unit Refrigerant Oil Self Recovery Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
Discharge Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
Current Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
Pressure Sensor Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
Backup Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
Service Maintenance Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
Other Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Ordinary Display Controls and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Monitoring Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Outdoor Unit Alarm History Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Mode Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
REMOTE CONTROLLER FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
1.
2.
3.
Simple Settings Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Detailed Settings Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Remote Controller Servicing Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
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Section 5:
TROUBLE DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
1.
2.
3.
Contents of Remote Controller Switch Alarm Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Outdoor Unit Control Panel LED Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Remote Controller Servicing Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
4.
5.
6.
7.
8.
2WAY VRF Alarm Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Blinking Inspection Display on the Remote Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-27
Inspection of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28
Test Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-29
Thermister Characteristics Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-30
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2WAY VRF SYSTEM
Control Functions
Contents
1. CONTROL FUNCTIONS
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2. Selecting Outdoor Unit for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3. Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
4. Special Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
1
5. Other Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
6. Operation of Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
7. Outdoor Unit Electronic Thermostatic Expansion Valves [MOV1, MOV2 & MOV4] . . . 1-17
8. Outdoor Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
9. Demand Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
10. Indoor Unit Control of the Electronic Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
11. Rap Valve Kit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
12. Indoor Unit Refrigerant Oil Self Recovery Control . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
13. Discharge Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
14. Current Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
15. Pressure Sensor Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
16. Backup Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
17. Service Maintenance Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
18. Other Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32
1-1
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2WAY VRF SYSTEM
Control Functions
1. Introduction
The 2WAY VRF is a system that allows multiple outdoor units to be connected. The outdoor units all contain
inverter compressors, and the system does not utilize the sub units that were used in earlier systems.
The outdoor unit where the unit No. is set to “1” includes the CCU (command controller unit) functions that are
used to control the entire system. As a result, the system will not operate if no outdoor unit has been set as unit
No. “1.”
Required settings for Test Run
1
System address
No. of indoor units
No. of outdoor units
Unit No.
Outdoor unit No.1
Outdoor unit No. 2
On-site
setting
At time of shipment
At time of shipment On-site setting
Not necessary
1
1
System 1 ~ 30
Not necessary
1 ~ 40 units
1
1
1
1
Not necessary
1 ~ 3 units
Unit No. 2
1
1
Unit No. 1
This system can be expanded to connect a maximum of 3 outdoor units. (The max. system capacity shall be within
24 Ton.)
The CCU functions are disabled at all units except the unit that is set as unit No. 1. Therefore no problems will
result even if the system address, No. of indoor units, and No. of outdoor units settings are made at the other units.
However, making these settings may be convenient for manual backup operation, as it eliminates the necessity of
making the settings again if unit No. 1 fails.
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2. Selecting an Outdoor Unit for Operation
2WAY VRF SYSTEM
Control Functions
2-1. Outdoor Unit Operating Rules
Because in this system all outdoor units contain an inverter compressor, ordinarily there is no absolute order of
priority for compressor operation. Therefore there is no order of priority for the outdoor units.
However, it is possible to operate the outdoor units in sequence, beginning with unit No. 1, by using the outdoor
unit maintenance remote controller to change the outdoor unit EEPROM settings.
* For information concerning EEPROM settings, refer to the field application functions.
1
2-2. Delayed Start of Outdoor Units
(1) Delayed start of outdoor units in the same system
If it is necessary to operate the compressors simultaneously at multiple outdoor units, each outdoor unit will
start, beginning with unit No. 1, after a delay of a number of seconds equivalent to the outdoor unit address.
The units do not start simultaneously.
This is in order to reduce the load on the power receiving equipment.
Outdoor unit
address 1
Outdoor unit
address 2
Starts after 1 second
Starts after 2 seconds
(2) Delayed start for each system
At the time of factory shipment, delayed start for each system is not set to occur. Therefore when systems are
linked and multiple systems are selected for start simultaneously by the central control device, all systems will
begin operating simultaneously. For this reason, a function is included to delay the start time for each system
address when systems are linked and multiple systems are selected for start by the central control device.
In order to enable this delay time, it must be set in the EEPROM for each system. Those systems where this
setting has been made will start after a delay according to their system addresses.
* For information concerning EEPROM settings, refer to the field application functions.
2-3. Outdoor Unit Stop Rules
(1) Simultaneous stop of multiple outdoor units
When all outdoor units, or multiple outdoor units, must stop, the units stop at the same time. However, depending on the communications timing, a difference of approximately 10 seconds may occur.
(2) Stopping individual outdoor units
The last unit to stop operating is the outdoor unit that contains the inverter compressor with the shortest
amount of operating time.
In cooling mode, all inverter compressors in the outdoor units are designed to operate simultaneously.
Therefore, all the outdoor units will stop at a time when any one unit is stopped. In heating mode, the out door unit which has the inverter compressor with the shortest amount of operating time continues to run and
rest of the other outdoor units may be stopped.
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2WAY VRF SYSTEM
Control Functions
3. Compressor Control
3-1. Compressors Mounted in the Outdoor Units
[U-72ME1U9(E), U-96ME1U9(E)]
72
96
Rotary
DC Inverter
DC Inverter
Scroll
–––
5 hp
Capacity
Compressor 1
Installed
compressor
Compressor 2
1
hp = horsepower
Constant
speed INV
INV
Compressor 1
Type 72
Compressor 2 Compressor 1
Type 96
3-2. Compressor Selection Rules
In cooling mode, all inverter compressors in the outdoor units are designed to operate simultaneously. All the
inverter compressors will stop at a time when the outdoor is stopped accordingly. Constant-speed compressors
run in order of the shortest amount of operating time. In heating mode, the inverter compressor with the shortest
amount of operating time runs at first followed by the compressors in order of the shortest amount of operating
time including inverter units.
* Immediately after installation, all compressors have an operating time of zero. In this case, the compressors
start in the following sequence: Inverter compressor > Constant-speed compressor 1.
Examples of accumulated operating time: ODU=Outdoor Unit
Suppose the following tentative system.
Comp 1
Comp 2
ODU 1
ODU 2
100 hrs.
150 hrs.
70 hrs.
160 hrs.
Compressor Selection Sequence in Cooling Mode:
All the inverter compressors are firstly selected simultaneously.
ODU 1
Comp 1
Comp 2
ODU 2
1st
1st
3rd
4th
Compressor Selection Sequence in Heating Mode:
First, the inverter compressor with the shortest amount of operating time is selected. And then, the remained
other compressors are selected and start in the order of shortest amount of operating time.
Comp 1
Comp 2
ODU 1
ODU 2
3rd
4th
1st
2nd
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2WAY VRF SYSTEM
Control Functions
3. Compressor Control
3-3. Compressor Capacity Control
The compressor operating conditions vary depending on the indoor unit operating conditions and the effects of
indoor heat load, outdoor temperature and other factors. Unit No. 1 (CCU) calculates the required capacity according to these operating conditions, and allocates the capacity requirement among the outdoor units, according to the
compressor start/stop rules. Fine adjustments to system capacity control are made by the inverter compressors.
(Depending on the conditions, all inverter compressors may be operating for fine adjustment.)
1
3-4. Inverter Compressor Capacity Control
(1) The inverter compressor has a center limit value and upper limit value for the operating frequency. These limits
are set for each outdoor unit capacity.
(2) The inverter frequency during operation may be lower than the frequency listed above due to overload current
protection control.
* If Quiet mode is selected, the inverter may stabilize at a frequency lower than those stated above.
For information about Quiet mode, refer to the field application functions.
* If the Power Demand Mode is selected, the inverter may stabilize at a frequency lower than those stated
above. Refer to the Field Application Function for the detail.
3-5. Forced Compressor Stop
Once a compressor stops, it will not start for a period of 3 minutes (3-minute forced OFF). However, this does not
apply when the compressor was forced to stop as the result of a control operation during the special controls (start
control, defrost control, refrigerant oil recovery control, etc.) which are described later.
3-6. Roadmap Control
(1) The below mentioned Roadmap Control are performed according to the pressure sensor on the outdoor unit,
and the 2 temperature sensors attached to the indoor unit heat exchanger coil.
* With the roadmap control in heating mode, the pressure detected by the pressure sensor at high pressure
side is converted to the saturation temperature. This converted saturation temperature is called the “High
Pressure Saturated Temperature”.
(2) This control is performed every 15 seconds.
(3) The evaporation temperature control and the temperature used to determine the area (A, AB, B, C) for the condensation control shown in the figure on the next page, may vary depending on the relationships among factors
including the difference between the room temperature setting and the air intake temperature (=air intake temperature difference) and the difference between the air discharge temperature setting and the air discharge
temperature (=air discharge temperature difference).
(4) Definitions of evaporation temperature and condensation temperature
Evaporation temperature (Te):
Lowest heat exchanger temperature (E1, E3) at any indoor unit
Condensation temperature (Tc): Highest temperature among the outdoor unit pressure sensor temperature and
the heat exchanger temperatures (E1) at all indoor units where the heating
thermostat is ON.
Ordinarily, this is the outdoor unit pressure sensor temperature. (If multiple
outdoor units are connected, this is the highest outdoor unit pressure sensor
temperature. )
* E3 temperature in heating mode is not used for the condensation temperature detection, because it may indicate the temperature of superheated gas.
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2WAY VRF SYSTEM
Control Functions
3. Compressor Control
3-6-1. Evaporation Temperature (Te) Control: Control of Indoor Units Operating in Cooling Mode
60.8
°F
51.9
Horsepower increase
permitted
Area A
53.6
51.8
51.8
1
Horsepower increase
41.1 permitted
Area AB
45.5
41.0
41.0
Horsepower increase
prohibited
Area B
35.6
35.4 Horsepower decrease
35.6
Area C
0
15
30
Maximum requirement level [L]
* Depending on the maximum requirement level of the indoor unit, the judgement
temperatures for each area may vary as shown in the figure.
(1) For indoor units that are operating in Cooling Mode, if one unit is selected for a test run mode, the room temperature control by the set temperature cannot be performed. Areas B and C are assumed to be area A for control
purposes, instead. By this reason, the compressor continues its operation regardless of the low evaporation
temperature (This is used for additional charging of refrigerant, test run checking etc.) Vapor may be discharged
if the test run continues for a long time. However, this does not indicate problems.
(2) Even within the same area, the compressor capacity varies depending on the refrigerant temperature.
(3) For 6 minutes after the compressors start, area C is considered to be area B for control purposes.
(4) During special control, control of the compressor capacity according to Te is not performed.
(5) If the thermostat turns OFF while Te is within area C, the next time the compressor starts it may restart from a
lower capacity.
(6) When the area changes to area C, area C is considered to be area B for control purposes for the first 6 minutes, even if the horsepower is the minimum value within the range where capacity control is possible (operation with inverter frequency of 25 Hz only). Subsequently if C area continues, the thermostat turns OFF.
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2WAY VRF SYSTEM
Control Functions
3. Compressor Control
3-6-2. Condensation Temperature (Tc) Control:
Control of Indoor Units Operating either in Cooling Mode or Heating Mode
PX=125.6°F Thermostat OFF
Area D
PX –0.1
Horsepower decrease
Area C
118.5
118.4
1
118.4
Horsepower increase
prohibited
Area B
116.6
116.6
116.4
Horsepower increase
113.0 permitted
Area AB
112.8 Horsepower increase
permitted
Area A
109.4
100.4
* Depending on the maximum requirement level
of the indoor unit, the judgment temperatures
for each area may vary as shown in the figure
(example).
107.6
98.6
0
15
30
Maximum requirement level [L]
(1) For indoor units which are operating in Heating mode, if one unit is selected for a test run, the air intake temperature difference is ignored, however Tc control is performed according to the figure above in order to prevent excessive load. (This is used for test run checks, etc.)
(2) Even within the same area, the compressor capacity varies depending on the refrigerant temperature.
(3) Temperature PX is the coefficient value used to correct for any deviation with the high pressure or condensation temperature. It may vary. (At the time of shipment it is 127°F.)
(4) If the condensation temperature (Tc) enters area D and the thermostat turns OFF, the next time the compressor
starts it may restart from a lower capacity.
3-6-3. Protection control
Protection control consists of 2 types of protection: discharge temperature protection and current protection. The limit
values from this protection control are incorporated into the output compressor capacity increase/decrease values that
were calculated from control based on the temperature at the indoor unit heat exchanger coil (roadmap control).
* In some cases, the control shown below may stop the compressor, issue a warning, or reduce the compressor
capacity.
(1) Discharge Temperature Protection
During operation when only a single outdoor unit is installed, the air discharge temperature level is determined
(the highest value is used), and the compressor capacity is limited, by using the air discharge temperature of
the operating compressor (as shown in the tables below).
Air discharge temperature level: Highest level among the air discharge temperature levels of all compressors
Horsepower limit
Air discharge temp. level Discharge temp. °F
5
Decrease by 2 horsepower
221
4
219
Decrease by 1 horsepower
3
Decrease by 0.5 horsepower
217
2
212 ~ Less than 217
Prohibit horsepower increase
1
208 ~ Less than 212 Permit horsepower increase (slowly)
Less than 208
No control
0
The values shown in the table above are reduced to the values calculated by roadmap control.
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2WAY VRF SYSTEM
Control Functions
3. Compressor Control
(2) Current Protection
Inverter compressor current control is composed of primary current control and secondary current control.
Current protection control for the inverter compressor is performed by self-protection in the inverter circuit, and
does not increase or decrease the compressor capacity.
Primary current
1
16.0A~
14.5A~
13.5A~
Control
Secondary current
75.0A or (302°F)
Inverter compressors stop (HIC auto. protection)
Inverter compressors stop (When 100ms is detected,
current protection works.)
16.5A
Hz decrease in the inverter compressor
13.5A
13.0A
12.5A
12.0A
Prohibit Hz increase in the inverter compressor
Permit Hz increase in the inverter compressor
80Hz
90Hz
3-6-4. Roadmap Control after Trip
When restarting after the trip stop occurs, the horsepower may increase slowly depending on the trip counter value.
(1) If trip counter =1, the horsepower increases at a speed that is 1/2 of ordinary roadmap control.
(2) If trip counter =2, the horsepower increases at a speed that is 1/3 of ordinary roadmap control.
The trip counter will be cleared if no trip occurs within 10 minutes after operation starts.
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2WAY VRF SYSTEM
Control Functions
4. Special Controls
In addition to ordinary heating and cooling operation, this system also includes the following 3 types of special controls for control of the system as a whole.
1. 4-way Valve Adjustment Control
2. System refrigerant oil recovery control
3. Defrost control
4-1. 4-way Valve Adjustment Control
When the microcomputer is initialized immediately after power-ON, after warning output, and all outdoor units are
kept stopped for a preset period (standard = 60 minutes) , the 4-way Valve Adjustment Control will be performed.
This control is intended to changeover the 4-way valve of outdoor unit. When the unit has been stopped for long
period, and if refrigerant has accumulated somewhere in the tubing, recovery of the refrigerant is performed. This
control can also compensate for tubing thermal loss by radiation during heating start as well as for oil recovery.
1
(1) Cooling control when the outdoor unit heat exchanger is acting as a condenser
Control time
Outdoor units
Electronic Thermostat
Expansion Valve
Indoor
units
RAP valve kit
Fan
60 seconds
All outdoor units operate at the maximum horsepower.
Valves at all indoor units operate at a fixed pulse according to the indoor unit capacity.
Valve kits at all indoor units operate in Cooling mode (OFF status).
Fan operates at the set fan speed or stops, depending on the indoor unit operation
mode.
* When the above operation is finished, normal operation starts at the horsepower determined by the indoor units where
thermostats are ON.
(2) Heating control when outdoor unit heat exchanger is acting as an evaporator
Control time
Outdoor units
Electronic Thermostat
Expansion Valve
Indoor
units
RAP valve kit
Fan
Minimum 1 min - Maximum 10 min [until max (pressure sensor temp., E1)
All outdoor units operate at the maximum horsepower.
95°F ]
Valves at all indoor units operate at 250 pulses as a default.
Valve kits at all indoor units operate in heating mode (ON status).
Fan operates at the set fan speed, stops or operates at a very low speed,
depending on the indoor unit operation mode.
* When the above operation is finished, normal operation starts at the horsepower determined by the indoor units
where thermostats are ON.
4-2. System Refrigerant Oil Recovery Control
4-2-1. System refrigerant oil recovery cycle
This control is performed using the cooling cycle during cooling operation and using the heating cycle during heating operation.
4-2-2. Start of System Refrigerant Oil Recovery Control
When the oil level in an operating compressor is detected as 0 (zero), the compressor stops in 120 seconds. If this
compressor repeats this operation 3 times and the oil level does not reach 2, system refrigerant oil recovery control is started.
* When the compressor has stopped because the oil level is 0, a count is added to the alarm counter. The counter
for this compressor is not cleared unless the oil level for that compressor reaches 2, or else alarm output occurs.
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2WAY VRF SYSTEM
Control Functions
4. Special Controls
4-2-3. Refrigerant Oil Recovery Control between Systems
(1) Simplified flow of system refrigerant oil recovery control
Refrigerant oil recovery control between systems shall be performed as the flow mentioned below.
Normal operation
3-minute stop
Refrigerant oil recovery control between systems (Max. 3 minutes)
minute stop
Normal operation
3-
(2) Cooling cycle
1
Control time
Outdoor units
Electronic Thermostat
Expansion Valve
Indoor
units
RAP valve kit
Fan
Maximum 3 minutes (Stops once before and once after control.)
All outdoor units operate at maximum horsepower.
Valves at all indoor units operate at a fixed pulse according to the indoor unit capacity.
Valve kits at all indoor units operate in Cooling mode (OFF status.)
Fan operates at the set fan speed, or stops depending on the operation mode of the
indoor unit.
(3) Heating cycle
Control time
Outdoor units
Electronic Thermostat
Expansion Valve
Indoor
units
RAP valve kit
Fan
Maximum 3 minutes (Stops once before and once after control.)
All outdoor units operate at maximum horsepower.
Valves at all indoor units operate at 480 pulse.
Valve kits at all indoor units operate in Heating mode (ON status.)
Fan operates at the set fan speed, stops or operates at a very low speed.
4-3. Defrost Control
4-3-1. Defrost Methods
This system uses the following 2 defrosting systems.
System employs
Defrost control method
1 outdoor unit in the refrigerant system
Reverse cycle defrost
2 outdoor units in the refrigerant system
Outdoor unit cycle defrost
4-3-2. Constraint conditions
(1) Frost detection does not occur for 5 minutes after operation starts.
(2) Defrost does not begin again for 35 minutes of A/C operation after defrost was once completed.
(3) If all indoor units are stopped while defrost control is in effect, or if the outdoor unit is stopped due to protection
control or another reason, then defrost control will not start for a minimum of 10 minutes after restart occurs.
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2WAY VRF SYSTEM
Control Functions
4. Special Controls
4-3-3. Frost detection
(A) Frost detection does not occur for 5 minutes after operation starts.
(B) Frost is detected when either condition 1 or 2 below is met.
Condition 1: L2 line or below is detected twice, each time continuously for 4 minutes, when the compressor is
operating.
Condition 2: L1 line or below is detected for a total of 60 minutes when the compressor is operating.
Heat exchange liquid temperature °F
Defrosting operation
end temperature
50
50
–6.5
1
(The end temperature
is different from the
above detection
temperature.)
External temperature °F
30
L1
26
17
L2
14
The frost detection area is
located under the thick lines
–9
–13
4-3-4. Outdoor units where defrost occurs
Even if the total time has not reached 35 minutes, if there is 1 or more outdoor units that fulfills the defrost detection conditions, all operating outdoor units perform defrost control at the same time.
* Defrost control is also performed at outdoor units where the outdoor unit heat exchanger is not functioning as an
evaporator (such as stopped outdoor units).
4-3-5. Reverse Cycle Defrost
If there is 1 outdoor unit and no thermal storage tank in a refrigerant system, a reverse cycle defrost will be carried out.
• Defrost flow
E: Evaporator operation
C: Condenser operation
E C: Switching from evaporator operation to condenser operation
C E: Switching from condenser operation to evaporator operation
Outdoor unit status
Stopped indoor units
Indoor units where fan is operating
Thermostat ON
Cooling mode
Thermostat OFF
indoor units
Thermostat ON
Heating mode
Thermostat OFF
indoor units
Compressor
Time
Defrost preparation
E C
E C
C E
E
E
C E
C E
E
E
C E
E
C E
E
C E
Stopped Operating
1 min
1 min
Defrost in progress
C
E
E
Defrost
end
E
judgment
E
E
E
Operating
Defrost end
C E
E C
E C
E C
E C
E C
E C
Stopped
Max. 10 min
1 min
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2WAY VRF SYSTEM
Control Functions
4. Special Controls
4-3-6. Outdoor unit cycle defrost
Outdoor unit cycle defrost is performed in systems where 2 outdoor units are connected to the refrigerant system.
1
(1) Description of outdoor unit cycle defrost
With this defrost method, when 1 outdoor unit operates in defrost mode (heat exchanger operating as a condenser), another outdoor unit operates as an evaporator in the same way as in ordinary heating mode.
In this way, the other outdoor unit is heating the unit where defrost is occurring. When 1 outdoor unit completes
defrost, the other outdoor unit performs defrost in the same way.
Because the amount of time that the unit operates as an evaporator is very short, there is little danger of frost
forming again quickly. Rather, because the heat source is very powerful, it is possible to shorten the defrost
operating time.
(2) Defrost sequence
Outdoor unit cycle defrost is always completed in 2 defrost operations.
(A) When there are 2 outdoor units
Switch
Defrost
outdoor unit
Evaporator
outdoor unit
Evaporator
outdoor unit
First operation
• Defrost flow
Defrost
outdoor unit
Second operation
E: Evaporator operation
C: Condenser operation
S: Shut off
E
C: Switching from evaporator operation to condenser operation
C
E: Switching from condenser operation to evaporator operation
Defrost
preparation
Outdoor unit(s) where defrost occurs first
E C
Outdoor compressor(s) where defrost occurs first
OFF
Outdoor unit(s) where defrost follows later
E
Outdoor compressor(s) where defrost follows later
ON
Stopped indoor unit(s)
S
Indoor units where fan is operating
S
Thermostat ON
C
Heating mode indoor
Thermostat OFF
units
C
1 min
Time
Defrost in
Switch
progress
C
C E
ON
OFF
E
C
E
ON Defrost
OFF
end
S
S
judgment
S
S
C
C
C
C
Max. 6 min
1 min
Defrost in
progress
Defrost
preparation
E
ON
C
ON Defrost
end
S
judgment
S
C
C
Max. 6 min
E or S
OFF
C E or S
OFF
S
S
C
C
1 min
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2WAY VRF SYSTEM
Control Functions
4. Special Controls
4-3-7. Defrost end judgment conditions
Defrost ends when either of the below defrost end judgment conditions is met.
Condition 1: The temperatures are 50°F or higher at all temperatures sensors installed on the outdoor unit heat
exchanger coils.
However, if there is any other outdoor unit where the defrost end condition has not been met, defrost
control continues for all outdoor units, and system defrost control is not ended.
Condition 2: The maximum defrost time listed in the table above has elapsed.
1
4-3-8. System defrost end
When all outdoor units where defrost control is in effect have met the defrost end conditions, defrost control is
ended for the system.
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2WAY VRF SYSTEM
Control Functions
5. Other Controls
5-1. Oil Control
5-1-1. Oil level
Oil level
Meaning
Conditions of oil
Judgement
Sufficient
The compressor contains oil more than
the oil level which is necessary and
sufficient for normal operation.
There is no problem.
2
1
Slightly low
The compressor contains sufficient oil
but there is a possibility of shortage
against the required oil level.
Confirm that oil is returned after
performing the oil control operation.
0
Extremely low
The compressor oil is short against
the required oil level sufficient for normal
operation.
Confirm that oil level is recovered to the
required level after performing the oil
recovery control between systems.
1
At the time immediately after the oil level changes from 2 to 1, there is a specified amount of oil in the compressor.
Namely, soon after the oil level is changed to 1, the oil in the compressor is not empty. If the oil level “0” indication
continues for more than 5 to 10 minutes, it seems short of oil in the system. Check for any oil leakage as well as the
refrigerant tubing.
5-1-2. Oil level detection
Excess oil in the compressor is sent by bypass via a capillary tube to the low-pressure circuit. The temperature
detected by a temperature sensor is used to determine whether it is oil (warm) or refrigerant (cold).
5-1-3. Self-separator oil recovery control
* When a low oil level is detected, this control recovers the oil which has accumulated in that oil separator and
sends it to the compressor.
(1) Operation when oil level is not 2.
30 seconds after the oil level changes from 2 to 1, the recovery valves turn ON.
However, if the oil level becomes 2, this control is stopped.
5-1-4. Unit refrigerant oil recovery control – utilizing balance tubes
* If the low oil level continues, that outdoor unit (oil-receiving outdoor unit) receives a supply of oil from operating
outdoor units where the oil level is not low (oil-supply outdoor units).
(1) Control at the oil-supply outdoor unit begins 3 minutes after the oil level at the outdoor unit dose not become 2.
Oil supply is performed for a maximum of 5 minutes from each unit.
(2) When oil supply is ended, oil supply from that outdoor unit will not occur again for a period of [(No. of outdoor
units minus1) x 5 minutes]. In addition, oil supply is ended if the oil-receiving outdoor unit oil level changes to 2,
or if the oil-supply outdoor unit oil level becomes low.
(3) The supply of oil is received from 1 unit at a time, in sequence, according to the order of priority of their inverter
compressors.
(4) Operation during unit refrigerant oil recovery
(A) Oil-receiving outdoor unit
The recovery valve turns ON and remains ON.
(B) Oil-supply outdoor unit
The balance valve turns ON and remains ON.
The bypass valve repeatedly turns ON and OFF according to a constant cycle.
5-1-5. Indoor unit refrigerant oil self-recovery control
Refer to the items concerned with indoor unit special control.
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2WAY VRF SYSTEM
Control Functions
6. Operation of Solenoid Valves
6-1. Refrigerant Control Valve [RCV]
The main purpose of this valve is to detect the flow of refrigerant (refrigerant volume) on the indoor-unit side when
the outdoor unit heat exchanger is functioning as a condenser. When the valve determines that there are signs of
a low refrigerant level, refrigerant is supplied from the receiver tank to the system.
(1) The OFF conditions take priority over the ON conditions for this valve.
(2) This valve is OFF when the outdoor unit is stopped.
(3) This valve is ON when special control is in progress.
1
Hp
(4) Control during normal operation
(A) Cooling operation
This valve turns ON when symptoms of insufficient refrigerant gas occur at an
indoor unit.
This valve turns ON when the outdoor air temperature is 59°F or below. (Under
these conditions the high pressure is low and refrigerant flow becomes poor.)
This valve turns OFF when symptoms of refrigerant overcharge are detected at
the outdoor unit.
(B) Mixed cooling/heating operation
The RCV turns ON at stopped outdoor units when the heat exchanger at another outdoor unit is functioning as a condenser.
6-2. Refrigerant Balance Valve [RBV] – Gas Purge Valve
The main purpose of this valve is to detect the flow of refrigerant (refrigerant volume) on the indoor-unit side when
the outdoor unit heat exchanger is functioning as an evaporator. When the valve determines that there are signs of
excess refrigerant, refrigerant is recovered at the receiver tank.
This valve is ON during heating operation and when the outdoor unit heat exchanger is functioning as an evaporator during mixed heating/cooling operation. It also turns ON in order to recover refrigerant at the outdoor unit after
heating operation is stopped.
* This valve is never turned ON at the same time with the RCV.
(1) The OFF conditions take priority over the ON conditions for this valve.
(2) This valve turns ON for 30 – 50 seconds after the outdoor unit stops, and then turns OFF.
(3) This valve turns ON once after the outdoor unit starts.
(A) Heating operation
This valve is ON during heating operation and when it turns ON for the purpose
of recovering refrigerant in the outdoor unit at the end of the heating operation.
After the valve turns from ON to OFF, it will not turn ON again for 15 minutes.
This valve turns ON when poor refrigerant flow at an indoor unit is detected,
and when symptoms of overcharge are detected, if the heat exchanger at the
outdoor unit is functioning as an evaporator.
Lp
(4) This valve turns OFF when an abnormal drop in discharge gas temperature is detected.
(5) This valve turns OFF when a drop in the detected receiver tank temperature continues for a set length of time, and when liquid back-flow is judged to be occurring.
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Control Functions
6. Operation of Solenoid Valves
6-3. Recovery Valve (ORVR)
This valve recovers refrigerant oil from the balance tube to the compressor.
(1) When unit is stopped
This valve is always OFF.
(2) When unit is operating
(A) This valve turns ON when separator oil self-recovery control is in progress.
1
(B) This valve is ON when unit refrigerant oil recovery control is in progress (oil-receiving unit).
(C) This valve is ON when control the system in case of insufficient refrigerant gas.
(D) This valve turns ON for 60 seconds after a constant-speed compressor starts.
(E) This valve turns ON for 120 seconds after defrost control ends.
(F) This valve turns ON for 10 seconds after the outdoor unit stops.
(G) This valve remains OFF at all times other than (A) through (F) above.
6-4. Bypass Valve (BPV)
This valve flushes the oil from the balance tubes. In addition, it is used for recovering refrigerant from stopped outdoor units during cooling operation.
(1) When unit is stopped
This valve is always OFF.
(2) When unit is operating
This valve is ON at the oil-supply outdoor unit when unit refrigerant oil recovery control is in progress.
* This valve repeatedly turns ON/OFF at regular intervals during unit refrigerant oil recovery control. (It is not
constantly ON.)
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2WAY VRF SYSTEM
7. Outdoor Unit Electronic Thermostatic Expansion Valves[MOV1, MOV2 & MOV4] Control Functions
7-1. Types of Electronic Thermostatic Expansion Valves
[U-72ME1U9(E), U-96ME1U9(E)]
Capacity
Electronic
control valve 1
Electronic
Electronic
control valve control valve 2
Electronic
control valve 4
72
Heat exchanger
1 valve
Heat exchanger
2 valve
96
Heat exchanger
1 valve
Heat exchanger
2 valve
For SC circuit
For SC circuit
1
7-2. Power Initialization
If no indoor units have started (even once) after the power was turned ON, the outdoor unit electronic control valve
operates at 480 pulses.
7-3. Heat Exchangers which are controlled by each Electronic Thermostatic Expansion Valve
The configuration of heat exchangers is as shown in the figure below. MOV3 is excluded.
Heat
exchanger 1
Heat exchanger 2
Front
Operation of Electronic Thermostatic Expansion Valve during normal unit operation
If any one compressor in the outdoor unit is operating, the outdoor heat exchanger coil is used.
In cooling operation, all the inverter compressors are designed to operate, therefore, all the outdoor heat
exchangers in the outdoor units will be used.
SH control controls the difference between the liquid temperature and gas temperature to 2°F ~ 10°F.
During heating mode SH operation in the heat exchanger 2 side, in order to prevent a liquid-back or high load
operation from occurring a control may be implemented so that refrigerant may not flow intentionally to the heat
exchanger.
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2WAY VRF SYSTEM
7. Outdoor Unit Electronic Thermostatic Expansion Valves[MOV1, MOV2 & MOV4] Control Functions
7-4. SC Circuit Electronic Control Valve [MOV4]
1
(1) SC Control (Cooling Mode only)
During cooling operation, the liquid refrigerant which condenses at the outdoor unit heat exchanger flows into
the receiver tank, and SC (sub-cool = supercooling) approaches 0°F. When SC is small and the length of the
tubing connecting the indoor and outdoor units is long, the refrigerant flow in the indoor unit will be reduced significantly. To prevent this trouble from occurring, MOV4 operates so as to increase supercooling in the double
tube coil near the outlet of the outdoor unit.
MOV4 controls refrigerant so that it will not flow back to the compressor in the liquid state with a suction temperature sensor near the accumulator and a low pressure sensor.
Liquid refrigerant (SC = 0°F)
Gas refrigerant returns
to the accumulator.
Refrigerant on the outer side evaporates,
cooling the liquid refrigerant on the inner side.
Liquid refrigerant
(large SC)
Electronic control valve 4
(expansion valve) controls the flow.
(2) Operation when discharge temperature is high
When the discharge temperature increases, the SC circuit electronic thermostatic expansion valve opens to
480 pulses to cool down the compressor. This operation takes priority over operation intended to increase SC.
It is performed at top priority in all operating modes. In addition, the valve opening adjustment will be made
when the discharge temperature falls.
Liquid refrigerant
Liquid refrigerant returns
to the accumulator.
Does not fully evaporate,
resulting in liquid back-up.
Liquid refrigerant
Electronic control valve
4 opens to 480 pulses.
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2WAY VRF SYSTEM
Control Functions
8. Outdoor Fan Control
8-1. Fan mode
These outdoor units utilize a DC fan motor that can be controlled in a maximum of 16 steps (16 modes).
However, fan modes 15 and 16 can only be used if high static-pressure mode has been set.
* For information concerning EEPROM settings, refer to the field application functions.
8-2. Outdoor Fan Min. Fan Mode and Max. Fan Mode
Cooling operation
Min. fan mode
Outdoor air temp. > 59°F: 1
Outdoor air temp. < 59°F: 0
Heating operation
Max. fan mode
1
14
14
1
* Even if the fan mode is 0 during cooling operation, the fan mode may change to 1 at regular intervals for temperature protection of the inverter hybrid IC.
8-3. Fixed Initial Fan Mode
For the first 30 seconds after operation starts, the mode is fixed at the initial mode which was calculated from the
relationship between the outdoor air temperature and the outdoor unit horsepower.
If the outdoor unit horsepower changes dramatically, say for about 2 hp, the initial mode may be recalculated and
may be again fixed for 30 seconds.
8-4. Operation after Fixed Initial Fan Mode
After the fixed initial fan mode, the fan mode is increased or decreased according to the operating conditions.
(1) When all indoor units are operating in cooling mode
(A) Fan mode is increased when the high pressure satulation temperature sensed by the pressure sensor is
high, and is decreased when the pressure sensor temperature is low.
* The fan mode is always increased when the high pressure satulation temperature sensed by the pressure
sensor is 113°F or higher.
(B) The fan mode may be decreased when symptoms of insufficient refrigerant gas are detected at an indoor unit.
(2) When all indoor units are operating in heating mode
(A) If the condensation temperature is low, the fan mode is increased at regular intervals.
(B) If the condensation temperature is high, the fan mode is decreased in order to prevent excessive loads.
(C) The fan mode may be increased when the outdoor liquid temperature drops to 44°F or below.
8-5. Snow Removal Control
(1) When the outdoor air temperature is 50°F or below, the fan operates for 30 seconds every 2 hours in fan mode
8, even when the outdoor unit is stopped or the heat exchanger is not in use. This control is intended to prevent
snow from accumulating on stopped fans. (Because the outdoor air temperature cannot be accurately detected
when the unit is stopped, a higher outdoor air temperature is used for the control condition, in order to ensure
correct operation.)
(2) If the fan mode becomes 0 during cooling operation, the fan mode is changed to 1.
* This control is predictive control. Use a snowfall sensor as necessary according to the installation conditions.
8-6. When the Compressor Magnet Switch Seizing Alarm Occurs
Because there is the possibility that the high pressure has increased, the fan operates in Max. fan mode.
8-7. Other
This unit includes settings for high static-pressure and for Quiet mode.
For information about these settings, refer to the field application functions.
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2WAY VRF SYSTEM
Control Functions
9. Demand Control
Serial-parallel I/O must be connected in order to perform demand control. The below input is received by serialparallel I/O, and demand control is performed.
The demand values can be set as needed with this device. For more information, refer to the field application functions.
1
Demand setting
Contact 1 Contact 2
Demand meaning
Control
No control
Operates to the upper limit for the rated current.
Operates to 70% of the upper limit for the rated current.
Always in stop condition.
: Input present
Operates to maximum capacity.
-
: Input not present
* The rated current indicates the current value that is listed in the catalog or similar material.
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Control Functions
10. Indoor Unit Control of the Electronic Control Valve
10-1. Normal Control
(1) Cooling operation
Stopped
Fan
Thermostat
OFF
Cooling
Thermostat
ON
Position of electronic control valve
Outdoor unit
Outdoor unit operating
stopped
20
20
20
20
20
1
20
Performs SH control in the range of 55 – 480
pulses.
–
* The SH target value is controlled so that the E3 - E1 becomes between 2°F to 6°F, depending on the operating
conditions.
However, a decline in the required level may cause the SH target value to increase. Be aware that in this case, the
electronic control valve closes slightly. This can be easily identified incorrectly as insufficient gas.
(2) Heating operation
(A) Except Type D
Position of electronic control valve
Outdoor unit operating
Stopped
Fan
Heating
Thermostat
OFF
Thermostat
ON
Liquid refrigerant is gradually returned to the outdoor unit
at pulses ranging from 55 to 80.
Liquid refrigerant is gradually returned to the outdoor unit
at pulses ranging from 55 to 80.
Liquid refrigerant is gradually returned to the outdoor unit
at pulses ranging from 55 to 80.
Performs SC distribution control within the range of 55–
480 pulses.
Outdoor unit
stopped
85
85
85
–
* The SC target value is controlled so that the high pressure saturated temp. - E1 becomes between 10°F to
40°F , depending on the operating conditions.
(B) Type D
Position of electronic control valve
20
20
Outdoor unit
stopped
20
20
20
20
Outdoor unit operating
Stopped
Fan
Thermostat
OFF
Heating
Thermostat
ON
Performs SC distribution control within the range of 55 –
480 pulses.
–
* The SC target value is controlled so that the high pressure saturated temp. - E1 becomes between 10°F to
40°F, depending on the operating conditions.
However, if installation is combined with except Type D, the high pressure saturated temp. - E1 may be
controlled between 10°F to 80°F.
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10. Indoor Unit Control of the Electronic Control Valve
2WAY VRF SYSTEM
Control Functions
10-2. Special Control
1
Reverse cycle
defrost control
Outdoor cycle
defrost control
System refrigerant
oil recovery control
Subject indoor units
Cooling
All indoor units
Heating
All indoor units
Stopped
Fan
Thermostat
ON
Heating
Cooling/
heating
Heating
4-way valve
adjustment control
Operating
mode
Heating
Control
Thermostat
OFF
Stopped
Fan
Thermostat
ON
Thermostat
OFF
Cooling
All indoor units
Heating
All indoor units
Position of electronic control valve
Fixed pulse for cooling, according to indoor unit
capacity
250
Cooling control, according to indoor unit capacity
Cooling control, according to indoor unit capacity
Fixed pulse for heating, according to indoor unit
capacity
Heating control, according to indoor unit capacity
However, position is 20 pulses for Type E1.
60 pulses
60 pulses
60 pulses
60 pulses
Fixed pulse for cooling, according to indoor unit
capacity
250
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2WAY VRF SYSTEM
Control Functions
11. Rap Valve Kit Control
A gas tube valve kit may be connected to the Type E1 indoor unit. When the gas tube valve kit is connected,
operations of gas tube valve kit and indoor unit electronic thermostatic expansion valve are as shown in the
table.
OFF
OFF
Electronic thermostatic
expansion valve
20 pulses
20 pulses
ON
20 pulses
ON
Superheat control (65 – 480)
OFF
20 pulses
OFF
Superheat control (50 – 480)
Heating
Cooling
Gas tube valve
Stopped
Fan
Thermostat
ON
Thermostat
OFF
Thermostat
ON
Thermostat
OFF
1
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12. Indoor Unit Refrigerant Oil Self Recovery Control
2WAY VRF SYSTEM
Control Functions
This control is carried out regularly in cooling mode only.
(1) During stopped, fan or thermostat OFF condition, indoor unit expansion valve is opened regularly for 1 to 2 minutes regularly (at an interval of once every 2 hours.)
(2) During the thermostat ON, the indoor unit electronic thermostatic expansion valve is opened about 10 pulses
from the current status.
1
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Control Functions
13. Discharge Temperature
<Alarm Information>
(1) Discharge temperature protection alarm
This device sets an upper limit discharge temperature of 222°F for all compressors. When the discharge temperature reaches 222°F, that compressor is stopped and restarted. If the same high discharge condition occurs
4 times, then an alarm occurs.
After a compressor has stopped, that compressor will not operate until the temperature has dropped to or
below the start-prohibit temperature.
Discharge temperature protection list
Compressor No.
Type
Stop temp.
Start-prohibit temp.
Alarm display
Compressor 1
Inverter
222°F
158°F
P03
1
Compressor 2
Constant-speed
222°F
158°F
P17
(2) Discharge sensor trouble detection control
An alarm occurs if the discharge temperature remains abnormally high (above 158°F), when the system has
been stopped for 60 minutes.
* In this case, possible causes include sensor failure and compressor overheating caused by an insufficient
level of refrigerant.
The alarm also occurs if the sensor temperature is at or above the abnormal temperature (176°F) when 20 minutes have passed after the compressor stopped.
* In this case, it is possible that the discharge temperature from a different outdoor unit is being detected, due
to an error in the installation of the discharge thermistor.
Discharge sensor failure list
Compressor No.
Type
Alarm display
Compressor 1
Inverter
F04
Compressor 2
Constant-speed
F05
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Control Functions
14. Current Protection
(1) Fan motor
Alarm
P22
Description
Occurs when the fan motor detects over current, or when the motor is locked and
does not turn.
(2) Inverter compressor
1
Alarm
P16
P26
P29
H31
Description
Occurs during ordinary operation when overcurrent (27 A) is detected.
Occurs under the same conditions as P16 when the inverter compressor is operating
at or above 80 Hz.
Occurs when missing phase or overcurrent (48 A) is detected at inverter compressor
start. (the alarm at frequencies below 25 Hz)
Occurs when HIC detects overcurrent (75 A), or when an abnormal high temperature
(302°F) is reached.
The inverter current includes a primary current and secondary current. The alarm judgment utilizes both currents. Generally, the secondary current is larger that the primary current.
(3) Constant-speed compressor
An alarm occurs when overcurrent or lock current is detected.
List of overcurrent and lock currents
Outdoor unit
type
96
Constant-speed
compressor
Compressor 2
Overload
current [A]
23.1
Lock current
[A]
27.3
List of Alarms
Compressor
No.
Detected
current
Alarm display
Compressor 2
Overcurrent
H11
Lock
current
H12
(4) CT circuit detection trouble
Compressor 1 (inverter
compressor)
Compressor 2 (constantspeed compressor)
Alarm
H03
H13
Description
Occurs when an open CT circuit is detected in the inverter
compressor.
Occurs when a current value of 1.5 A or less is detected
when the constant-speed compressor is operating.
If the inverter compressor operating frequency is low, the current value is also low. Therefore this alarm is
detected only when the compressor is stopped.
The operating current of the constant-speed compressors is always higher than 1.5 A. Therefore, this alarm
occurs as the result of an open circuit or failure.
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Control Functions
15. Pressure Sensor Failure
This system contains 2 types of pressure sensors: a high-pressure sensor and a low-pressure sensor.
(1) High-pressure sensor failure
Alarms are emitted when the high-pressure sensor becomes an electrical open-circuit or a short-circuit conditions, and a broken wiring, short-circuit or poor connection to the PCB in the high-pressure sensor circuit.
(2) Low-pressure sensor failure
Alarms are emitted when the low-pressure sensor becomes an electrical open-circuit or a short-circuit conditions, and a broken wiring, short-circuit or poor connection to the PCB in the low-pressure sensor circuit.
Alarm display
High-pressure sensor failure
F16
1
Low-pressure sensor failure
F17
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2WAY VRF SYSTEM
Control Functions
16. Backup Operation
<Field Application Functions>
Backup Operation
16-1. Automatic Backup Operation
This system includes a function for automatic backup operation. An alarm is also displayed to inform the operator
that a failure has occurred.
1
(1) Alarms that result in automatic backup operation
When compressor trouble or fan motor trouble makes emergency continued operation impossible, automatic
backup operation mode is engaged. Automatic backup mode is not engaged in cases of communications
alarms, automatic reset alarms, and other instances when emergency operation is possible by pressing the
remote controller buttons or changing other conditions.
The alarms that result in automatic backup mode are P16, P22, P26, P29, H11, H12, and H31.
(2) Start of automatic backup operation
If the above alarms occur, the alarm is displayed on the control device. Pressing the control device button again
starts automatic backup mode.
(3) Operation
[1] When 1 outdoor unit is installed
When 1 compressor has failed, backup operation is possible using the other compressors (only in the 96 type
(8 Ton)). However, operation does not occur when the outdoor fan is unable to operate as a result of alarm P22.
[2] When multiple outdoor units are installed
When automatic backup mode is engaged, the outdoor unit where the above alarm occurred stops operating.
However, if one or more of the compressors is able to operate, then this outdoor unit operates only when the
operation of all outdoor units is required for special control (such as 4-way valve adjustment) or other system
purposes.
(4) Alarm display
If a wired remote controller is present,
display blinks during operation.
(5) Canceling automatic backup operation
Repair the outdoor unit where the failure occurred. When repairs are completed, reset the power on outdoor
unit No.1.
<Caution>
After automatic backup mode has been engaged, it will not be canceled automatically when the repair of the
failed outdoor unit is completed. Automatic backup mode will be canceled only when the power on outdoor unit
No.1 is reset. Therefore, after repair work is completed, be sure to check whether or not automatic backup
mode has been canceled.
How to check: [1] Use test run or other means to verify that all outdoor units operate continuously.
[2] If a wired remote controller is present, check that
display has disappeared.
16-2. Manual Backup
If an alarm that does not result in automatic backup occurs frequently, possible causes include failure (such as
refrigerant leakage) of a functional part at an outdoor unit other than the unit where the alarm occurs.
In this case, because the outdoor unit service valve must be closed, backup operation must be performed manually.
(1) Backup operation procedure
[1] Disconnecting the failed outdoor unit
(A) Reduce the number of outdoor units set at outdoor unit No.1 by the number of failed outdoor units.
(B) At the S010 switch on the PCB of the failed outdoor unit, turn ON the switch for the compressor to dis
able, and turn ON the “backup” switch.
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2WAY VRF SYSTEM
Control Functions
16. Backup Operation
Outdoor unit tonnage
Switches to turn ON
8 Ton
INV+AC1+BU
(C) Close all service valves at the failed outdoor units.
(D) Reset the power at outdoor unit No.1.
* When the PCB of the main unit is normal, by implementing the above settings while leaving the communication lines between indoor and outdoor units as they are, backup operation of units are possible. In this case,
the outdoor unit that backed up all compressors is not identified as an outdoor unit, however, it can work as
the command controller.
1
[2] Disabling operation of 1 compressor
At the S010 switch on the PCB of the failed outdoor unit, turn ON the switch for the compressor to disable, and
turn ON the “backup” switch.
<S010 switch>
INV
(*)
AC2
AC1
Backup
ON
S010
OFF
(A) Compressor 1 backup
ON
OFF
(B) Compressor 2 backup
ON
OFF
* AC2 switch is not available.
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2WAY VRF SYSTEM
Control Functions
17. Service Maintenance Functions
The outdoor unit EEPROM settings can be used for the following functions.
17-1. Outdoor Unit Noise Countermeasure: EEPROM 05 (set at each outdoor unit)
This unit includes 3 types of Quiet modes. (However, when they are engaged, operation is in Quiet mode 24 hours
a day.) Selecting a Quiet mode results in operation that gives priority to reducing noise. Because these modes
involve restrictions on outdoor unit fan modes and the operation frequency, the capacity will be somewhat reduced.
1
Setting
Max. fan mode
Effect
Amount of capacity reduction
0
14
Normal operation (setting at time of
factory shipment)
1
12
Noise reduced by approx. 1 – 2 dB from
the catalog value.
Approx. 0.5 hp
2
11
Noise reduced by approx. 2 – 3 dB from
the catalog value.
Approx. 1.2 hp
3
10
Noise reduced by approx. 5 dB from the
catalog value.
Approx. 1.8 hp
0
* If Quiet mode is set, the capacity will begin to decrease during heating operation at low outdoor temperatures,
when the outdoor air temperature is below standard conditions.
17-2. Anti-slime countermeasures ... EEPROM setting 0C (set only on the main unit)
This setting controls the operation of the drain pump.
Setting
Description
0
Normal control (setting at time of factory ship ment)
1
The drain pump operates for 20 minutes at 2-hour intervals.
2
The drain pump operates for 20 minutes at 20-minute intervals.
3
The drain pump operates constantly.
17-3. Delayed Start for Each System: Outdoor EEPROM 3E (set only on outdoor unit No. 1)
The operation start time can be delayed according to the set system addresses.
This setting reduces the voltage drop by preventing multiple systems from starting at the same time when operation is restarted after multiple operating systems were stopped due to a power outage or other cause.
Effect
Setting
0
No delayed start (setting at time of factory shipment)
1
Start begins after [1 second x System address]
2
Start begins after [2 seconds x System address]
3
Start begins after [3 seconds x System address]
17-4. Automatic Backup: Outdoor EEPROM 48 (set only on outdoor unit No. 1)
Automatic backup is set to occur at the time the unit is shipped from the factory. However, the automatic backup
function can be disabled by changing this setting to 1.
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2WAY VRF SYSTEM
Control Functions
17. Service Maintenance Functions
17-5. Optional Solenoid Valve Control Operation Setting:
Outdoor EEPROM C0 (set at each outdoor unit)
Operation
Setting
0
No output (setting at time of factory shipment)
1
Refrigerant shut-off valve control
(for cooling when the outdoor air temperature is below standard conditions)
2
External liquid valve control
(used in special cases when the discharge gas temperature is especially likely to rise)
1
17-6. High Static Pressure Mode: Outdoor EEPROM 8F (set at each outdoor unit)
This product can be made compatible with high static pressure by changing the settings.
By changing the setting item 8F to “6,” this product can be made compatible with outdoor unit static pressure of
approximately 0.0085 psi (96 type only).
Setting No.
0
1
Compatible static
pressure (psi)
0.0014
0.0026
Speed
600
630
2
3
4
0.0037
0.0050
0.0061
0.0074
0.0085
670
710
740
770
800
5
6
17-7. Compressor Operating Sequence: Outdoor EEPROM 46
(set at outdoor units which include CCU functions)
When this setting is set to “1,” the compressors start in sequence beginning from the No. 1 outdoor unit.
(The setting is “0” at the time of shipment. With this setting, compressors with lower operating time are started
first in order to balance the compressor operating times.)
17-8. Demand Value Setting: Outdoor EEPROM 1A, 1B
(set at outdoor units that include CCU functions)
Demand setting
Control
Contact 1
Demand meaning
Contact 2
No limit
Operates to the maximum
capacity.
Demand can be set from 40 – 200% at
EEPROM 1A.
Current is limited to the set
values.
Demand can be set from 40 – 200 % at
EEPROM 1B.
Current is limited to the set
values.
Remains stopped.
–
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2WAY VRF SYSTEM
Control Functions
18. Other Functions
18-1. Snowfall Sensor Functions: Outdoor EEPROM 04
A unit identified as having a snowfall sensor attached will periodically send a signal indicating the snowfall sensor
input status to all outdoor units in the same system (or all wired outdoor units in the case of linked systems). It is
therefore unnecessary to install and wire multiple snowfall sensors.
(1) Snow fall sensor settings
Operation
Setting
1
0
Sensor input not present. Control is performed. (Setting at time of factory shipment)
1
Sensor input present. Control is performed.
2
Sensor input not present. Control is not performed.
3
Sensor input present. Control is not performed.
* If the snowfall sensor is used, then depending on the circumstances it is necessary to make the correct setting at
all outdoor units in the system.
* If “control is not performed” is set, control by the above signal is ignored. This setting is used in order to conserve
energy at outdoor units that include a snowfall-protection hood.
Recommended: If a low-speed fan mode is required (for all-year cooling or other reasons), install a snowfall-protection hood and set this setting to ON.
(2) Control operation
[1] Outdoor units where “sensor input present” is set send the snowfall sensor input information every 10 minutes to all linked systems if the system wiring is linked.
[2] At systems where “control is performed” is set, the above information is used to control operation of the outdoor fan.
[3] At systems where “control is not performed” is set, the snowfall sensor input and above information ignored,
and the outdoor fan does not operate.
[4] In case of 2WAY VRF system, control can be performed when snowfall sensor input is connected to
any outdoor unit.
<Caution>
Snowfall sensor input information is detected once every 10 minutes. Therefore, the outdoor fan may continue
operating for up to 10 minutes even when there is no snowfall sensor input.
In addition, the outdoor fan may remain stopped for up to 10 minutes when snowfall sensor input is present.
18-2. Function for Automatic Judgment of Insufficient Refrigerant Gas and Overcharge
This system includes a simple function for judging the level of refrigerant. However, be aware that false judgments
may occur if the control elements of the outdoor unit or indoor unit fail.
(1) Starting refrigerant level judgment mode
Short-circuit the CHECK pin on the No. 1 outdoor for 4 seconds or longer to engage this mode. (The LED on
the outdoor unit PCB begins blinking.)
(2) Conditions for refrigerant level judgment
After judgment mode starts, judgment occurs when all outdoor units in the system have been operating continuously for 30 minutes or longer.
* Refrigerant level judgment requires that all outdoor units operate continuously for 30 minutes or longer. This is
in order to prevent incorrect adjustment of the refrigerant level based on false detection caused by refrigerant
accumulation or recovery at stopped outdoor units, which is due to failures of functional elements.
After the judgment is displayed, repeated judgment will occur under new operating conditions if all outdoor
units continue operating. Therefore, the judgment display may change when later judgments occur.
* Judgment mode is automatically canceled after 4 hours.
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2WAY VRF SYSTEM
Control Functions
18. Other Functions
(3) Outdoor unit PCB LED indications in judgment mode
Judgment items
LED1
LED2
Recommended response
Judgment mode
Blinking
Blinking
-
ON
ON
-
Blinking
OFF
OFF
Blinking
Normal
Insufficient gas
Overcharge
Judgment not
possible
Charge with refrigerant a little at a time.
1
Recover refrigerant a little at a time.
-
Blinking alternately
When judgment mode is not engaged, the LED indicates the normal display (OFF), or else indicates alarms or
other information.
If the insufficient gas or overcharge judgment is not stable, then recover refrigerant a little at a time when the
overcharge display appears. End refrigerant adjustment when the normal or insufficient gas display appears.
(4) Canceling judgment mode
When judgment mode is cancelled, the LED returns to the standard status display (OFF unless an alarm or
other event has occurred).
[1] Automatic cancel
Judgment mode is canceled automatically when 4 hours have passed after it was started.
[2] Forced cancel
Short-circuit the CHECK pin while the judgment mode display is active in order to cancel judgment mode.
<Reference> General Guidelines for Insufficient Gas and Overcharge
Judgment in automatic judgment mode can be problematic in some cases. Therefore, the following guidelines
are provided for general judgment of the refrigerant amount.
• Symptoms of insufficient gas
Cooling
operation
There is an indoor unit where the position of the electronic control valve is much higher (open by
300 pulses or more) than it was at start, and the difference [E3 – E1] at that indoor unit is large
(30°F or more).
Heating
operation
There is an outdoor unit where the position of the electronic control valve is much higher (open by
300 pulses or more) than it was at start, and the difference [Liquid temp. – Gas temp.] at that
outdoor unit is large (30°F or more).
• Symptoms of overcharge
Cooling
operation
The high-pressure sensor temperature is 134°F or higher, and the difference [Pressure sensor
temp. – Liquid temp.] at that outdoor unit is large (30°F or more).
Heating
operation
There is an indoor unit where the position of the electronic control valve is much higher (open by
300 pulses or more) than it was at start, and the difference [Pressure sensor temp. – E3] at that
indoor unit is large (50°F or more).
These are only guidelines, therefore the judgment may vary depending on the installation conditions, load characteristics, and other elements.
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Outdoor Unit Repair Procedures
Contents
2. OUTDOOR UNIT REPAIR PROCEDURES
1. Removing Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2. Removing Electrical Component Box and Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
3. Discharging Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
4. Backup Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
5. Recovering Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
6. Checking for Leakage After Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
7. Evacuating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
8. Charging Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2
9. Pumping Out Refrigerant from Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
10. Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
11. High and Low Pressure Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35
12. Replacing 4-way Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36
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2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
1. Removing Panels
Procedures:
2
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Removing Panels
Removing Electrical Component Box and Duct
Discharging Compressor Oil
Backup Operation
Recovering Refrigerant
Checking for Leakage After Repair
Evacuating System
Charging Compressor Oil
Pumping Out Refrigerant from Outdoor Unit (when repairing parts other than compressor)
Compressor
High and Low Pressure Sensors
Replacing the 4-way Valve
(1) Front panel removal (Fig. 1)
• Remove the front panel (remove 11 screws).
Front panel
Fig. 1
(2) Power outlet panel & valve cover removal (Fig. 2)
• Remove the power outlet panel (remove 2 screws).
• Remove the tubing cover (remove 2 screws).
Power outlet panel
Tubing cover
Fig. 2
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2. Removing Electrical Component Box and Duct
2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
Be sure to turn off the power before removing the electrical component box. Then check that the power LED (D53)
on the control PCB of the outdoor unit is not lit.
(1) Remove the electrical component box cover
(remove 6 screws). (Fig. 3)
• When closing the cover after the repair work,
set the upper fringe of the cover should come
to align inside the electrical component box.
(Fig. 3A)
A
2
Electrical component
box cover
Fig. 3A
Fig. 3
(2) Remove power and control wires from terminals.
(3) Remove internal wires with extended connectors
on the outdoor control PCB.
(Solenoid valves, thermistors, crankcase heaters
and others)
(4) Disconnect power lines connected to the secondary terminals of the magnetic contactor for
the compressor.
(5) Remove the electrical component box (remove 2
screws). (Fig. 4)
Electrical
component box
Fig. 4
CAUTION
Be sure to release the locking mechanism
before disconnecting each connector.
Upper duct
(6) Remove the center duct. (Fig. 5)
Center duct
• The center duct is fitted into the upper and lower
ducts, and held in place by the electrical component
box, an arrangement that makes possible independent removal of the center duct.
Lower duct
Fig. 5
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2. Removing Electrical Component Box and Duct
2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
(7) Remove the lower duct: (remove 2 screws, and
a hook)
Lower duct
2
Fig. 6
(8) Remove the upper duct: (remove 3 screws)
(Fig. 7)
Upper duct
Fig. 7
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Outdoor Unit Repair Procedures
3. Discharging Compressor Oil
Discharged oil can be used for checking the condition of the system. Based on the appearance and color of the
discharged oil, a judgment can be made on whether the system is operating normally or not.
3-1. Discharging Oil from Oil Separator
Recover the refrigerant from the outdoor unit following the procedure given in “5. Recovering Refrigerant.” Install
hoses as indicated on the equipment and feed nitrogen gas gradually to provide pressure to the system from the
low-pressure outlet and collect oil in a pan or container. (Fig. 8)
CAUTION
• The low-pressure outlet port is at the Lo side of the right side.
• A faulty outdoor unit may remain pressurized. The oil outlet port employs a
Schrader-type push-to-release valve. Be careful to avoid accidental oil release
when using the port.
2
Packless valve or the like
Container
Oil outlet port
(For 1/4" (6.35mm)
-dia. connector)
Manifold gauge
Lo
Hi
Nitrogen gas
Fig. 8
Low-pressure outlet port
(For 5/16" (7.94mm)-dia. connector)
3-2. Discharging Oil in Compressor
Recover the refrigerant in the outdoor unit following the procedures in “5. Recovering Refrigerant.” Remove the
compressor and discharge the oil in it. Refer to “10. Compressor” for detailed procedures.
3-3. Checking the Oil
Acceptance/rejection criteria for the oil
Condition of oil
Judgment criteria for changing oil*
Condition of
refrigeration cycle
Color
Odor
Total acid value
Hue
Normal
Yellowish
None
0.02 or less
3.5 or less
Abnormal overheatoperation
Smells somewhat
(not as strong as below)
0.06 or over
4.0 or over
Brownish
Motor burnout
Brownish /
blackish
Pungent / burnt odor
Changing the oil and system cleaning
with dry-cores are necessary.
Changing the oil and system cleaning
with dry-cores are necessary.
* It is difficult to measure the total acid value in the field, therefore oil hue and odor are the rule of thumb. Checking
for carbon deposits and abrasive metal powder can additionally be used to assess the system condition.
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Outdoor Unit Repair Procedures
4. Backup Operation
This system includes an emergency automatic backup function that allows the A/C to operate during the period
after trouble occurs until repairs are made. However, during repair and at other times, use manual backup operation.
4-1. Automatic Backup
For details, refer to the control functions section.
After the alarm details are sent to the control device, control for automatic backup operation begins when the
ON/OFF button of the wired remote controller is pressed again (operation is started after the alarm is cleared).
During this operating mode, “CHECK” flashes on the wired remote controller only to inform the user that operation
is in backup mode. However this is not displayed on any other control devices.
• In order to cancel automatic backup mode, it is necessary to reset the power on the control PCB of the outdoor
unit where the outdoor unit No. setting (S007) on the control PCB is set to No. 1 (main unit).
(It is also available by resetting power of all the outdoor units.)
2
CAUTION
If the power is not reset on the control PCB of the No. 1 outdoor unit (main unit),
backup mode operation will continue after the repairs are completed.
Backup operation is intended as emergency operation until repairs are made. Have repairs made as soon as possible.
4-2. Manual Backup
This backup operation is the conventional method of backup operation. It involves disconnecting the failed outdoor
unit from the system, and operating only the normal outdoor units.
4-2-1. Backup operation by disconnecting the outdoor unit
(1) Changing the outdoor unit control PCB settings
<If the failed outdoor unit is not the No. 1 unit>
• Settings at No. 1 unit (main unit)
Switch on outdoor unit control PCB
Action
System address (S003, S002)
No change
No. of indoor units (S005, S004)
No change
No. of outdoor units (S006)
Subtract the number of failed units from the current setting.
Outdoor unit No. (S007)
No change
• Settings at normal outdoor units other than the No. 1 unit
No particular changes
• Settings at the failed outdoor unit
No particular changes
However, close all service valves (gas tubes, liquid tube, and balance tube) at the failed outdoor unit, and disconnect the wiring between the outdoor units.
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Outdoor Unit Repair Procedures
4. Backup Operation
<If the failed unit is the No. 1 outdoor unit (main unit)>
If the No. 1 unit (main unit) has failed, a different outdoor unit must be set as the No. 1 unit (main unit).
• Settings at the failed No. 1 outdoor unit
– No particular changes
– However, close all service valves (gas tube, liquid tube, balance tube) at the failed outdoor unit, and disconnect the wiring between the outdoor units.
• Settings at No. 1 unit (main unit)
Switch on outdoor unit control PCB
Action
System address (S003, S002)
Make the same settings as on the failed No. 1 unit.
No. of indoor units (S005, S004)
Make the same settings as on the failed No. 1 unit.
No. of outdoor units (S006)
Subtract the number of failed units from the current setting.
Setting outdoor unit No. (S007)
Change to “1.”
2
To this outdoor unit, connect the inter-unit communication line which was previously connected to the
No. 1 unit (main unit).
CAUTION
After recovery work is completed, wire the communication lines between
indoor and outdoor units again. If it not finished yet, an alarm is emitted
immediately.
• Settings at other outdoor units
No particular changes.
(2) Adjusting the refrigerant for backup operation
During backup operation, all of the service valves on the failed unit are closed. However, if a check of the
backup operating conditions shows that the level of gas is low, recover the refrigerant from the failed outdoor
unit. If the level of gas is too high, collect refrigerant at the failed outdoor unit.
Recovering refrigerant
With the normal outdoor units operating, monitor the operating condition and open/close the gas tube service valve on the failed outdoor unit where all the service valves were closed. In this way, recover refrigerant from the failed outdoor unit in order to adjust the amount of refrigerant in the system.
After adjusting the amount of refrigerant, close the gas tube valve at the failed outdoor unit.
Collecting refrigerant in the failed outdoor unit
• Short-circuit the vacuum application pin (CN102) on the control PCB of the failed outdoor unit where the
service valves are closed, then turn the power ON. Also disconnect the wiring between the outdoor units.
• With the normal outdoor units operating, monitor the operating condition and open/close the liquid tube service valve on the failed outdoor unit where all the service valves were closed. In this way, collect refrigerant
in the failed outdoor unit in order to adjust the amount of refrigerant in the system.
• After adjusting the amount of refrigerant, turn OFF the power at the failed outdoor unit, release the shortcircuit at the vacuum application pin, and close the liquid tube valve at the failed outdoor unit.
* Refrigerant recovery is not affected by the power status of the failed outdoor unit. However, collecting
refrigerant in the failed outdoor unit is affected by whether the power at that outdoor unit can be turned ON.
If the power cannot be turned ON, use a refrigerant recovery device and recover the refrigerant into a
recovery cylinder in order to adjust the amount of refrigerant in the system.
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Outdoor Unit Repair Procedures
4. Backup Operation
4-2-2. Backup operation by setting the failed compressor not to operate
Backup operation settings for each compressor
INV compressor
AC1 compressor
Setting for backup operation
OK
Failed
DIP switch S010:
Turn BACK UP and AC1 ON.
Failed
OK
DIP switch S010:
Turn BACK UP and INV ON.
Failed
Failed
DIP switch S010:
Turn BACK UP, INV, and AC1 ON.
2
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Outdoor Unit Repair Procedures
5. Recovering Refrigerant
The following equipment and tools are required:
Jumper wire with clips, adjustable wrench, set of manifold gauge valves specially designed for refrigerant R410A
only, vacuum pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flathead screwdriver, and
outdoor unit maintenance remote controller.
5-1. Refrigerant Recovery Procedures (from outdoor unit)
(1) Turn off the power of the outdoor unit beforehand (at power mains).
(2) Fully close each service valve on the liquid tube, gas tubes, and the balance tube of the outdoor unit.
(3) Connect the outdoor unit’s high-pressure and low-pressure outlet ports with the Hi and Lo sides of the manifold
gauge valves using hoses. (Fig. 9)
CAUTION
The remaining refrigerant in the faulty outdoor unit may create internal pressure.
Before connecting hoses, be sure to confirm that each of the manifold gauge
valves is tightly closed. Note that the connection ports employ Schrader-type
push-to-release valves.
2
(4) Connect the manifold gauge valves, refrigerant recovery unit, and recovery cylinder using hoses. To avoid the
entry of air into the refrigerant tubing, carry out this connection work carefully. (Fig. 9)
CAUTION
For detailed procedures such as connecting the refrigerant recovery unit with the
recovery cylinder and methods used for recovery, follow the specific instructions
that came with the refrigerant recovery unit.
(5) Locate the AP (Air Purge) pins on the control PCB in the faulty outdoor unit and short them using the clips of
the jumper wire. Then restore electrical power to the outdoor unit.
CAUTION
By short-circuiting the AP pins, each solenoid valve in the outdoor unit is forcibly
opened as soon as power comes on, which releases all remaining refrigerant into
the recovery cylinder. Since neglecting this procedure may leave some refrigerant
in the system, it is important that you carry out this step.
(6) Carry out refrigerant recovery.
CAUTION
To determine the completion of refrigerant recovery, follow the instructions that
came with the refrigerant recovery unit.
Manifold
gauge
Lo
Hi
High-pressure outlet
port (For 5/16" (7.94mm)
-dia. connector)
Refrigerant
recovery unit
Refrigerant recovery cylinder
Low-pressure outlet port
(For 5/16" (7.94mm)-dia. connector)
Fig. 9
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2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
5. Recovering Refrigerant
5-2. Refrigerant Recovery Procedures (Indoor Unit)
The flowchart below shows the refrigerant recovery procedures you must follow when replacing or repairing the
indoor unit due to trouble in the refrigerant circuit.
START
5-2-1. Cooling operation (for all units)
Ball valve is provided in the indoor unit
5-2-3. Refrigerant recovery
procedures (2)
NO
YES
5-2-2. Refrigerant recovery
procedures (1)
Replace or repair faulty unit
Check for leakage in repaired unit
Turn off all equipment in system
2
Turn off all equipment in system
Evacuate air from repaired unit
When replacing or repairing a faulty
unit, let other normal indoor units run
(excluding indoor unit where refrigerant
is recovered)
YES
NO
Power can independently be turned off
for indoor unit where refrigerant is
recovered
YES
NO
Fig.8
Charge refrigerant in repaired unit
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Modify power to permit turning off
power to refrigerant-recovered
indoor units independently
Ready for operation
END
Change controllable number of indoor
units (including changes in group
control and integrated-control settings)
Other indoor units can operate normally
Replace or repair faulty unit
Check for leakage in repaired unit H
Replace or repair faulty unit
Evacuate air from repaired unit H
Check for leakage in repaired unit H
Charge refrigerant in repaired unit H
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Evacuate air in repaired unit H
Change controllable number of indoor
units (including changes in group
control and integrated-control settings)
Charge refrigerant in repaired unit H
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Open ball valve
Open the ball valve
Ready for normal operation
Ready for normal operation
END
END
Service work performed on indoor units is done simultaneously using the service ports at the liquid (narrow tube) side
and the gas (wide tube) side ball valves. Refer to each section in the “Installation Instructions” on refrigerant charging,
leak checking, and evacuation procedures.
5-2-1. Cooling operation (for all units)
(1) If the remote controller (CZ-RTC2) is used for maintenance of the outdoor unit
1 Connect the outdoor unit maintenance remote controller to the RC connector (CN006) (3P) (BLU) on any
one of the outdoor unit control PCBs. Then start a test run of all units. (Press and hold the
(CHECK)
button for 4 seconds or longer.)
2
Press the
(MODE) button and change to cooling operation and ensure that the cooling is performed.
Refer to the test run service manual for the detail of the outdoor maintenance remote controller operation.
It may be possible to determine whether operation is cooling or heating by touching the gas tubing.
Cooling : low temperature (68 °F or lower)
Heating : high temperature (140 °F or higher)
CAUTION
The gas tubing becomes hot (140 °F or higher) in heating mode. Be careful so as
not to be burnt when touching the tubing.
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Outdoor Unit Repair Procedures
5. Recovering Refrigerant
(2) If the remote controller (CZ-RTC2) is not available for maintenance of the outdoor unit
1 Determine the outdoor unit where the unit No. setting (S007) (3P DIP switch) (Blue) on the outdoor unit
control PCB is set to No. 1.
2
Short-circuit the test-run pin (CN023) on the PCB to start test run operation.
3
Leave the unit running for a while, and touch the gas tubing with fingers to determine whether the unit is
running in cooling or heating mode.
If it is in heating, follow the step 4 and later procedures.
Cooling : low temperature (68 °F or lower)
Heating : high temperature (140 °F or higher)
CAUTION
The gas tubing becomes hot (140 °F or higher) in heating mode. Be careful so as
not to be burnt when touching the tubing.
4
Release the short-circuit at the test-run pin (CN023) on the outdoor unit control PCB of the No. 1 unit. Then
short-circuit the stop pin (CN104) to stop operation.
5
Short-circuit the mode-change pin (CN101) on the outdoor unit control PCB of the No. 1 unit.
* Switching of the 4-way valve occurs immediately before operation starts. Therefore it does not change at
this time. (Mode change cannot be judged from the sound.)
Short-circuit the test-run pin (CN023) on the PCB to start test run operation. Leave the unit running for a
while, and touch the gas tubing with fingers to determine that the unit is running in cooling mode.
6
2
5-2-2. Refrigerant recovery procedures (1) (using indoor unit ball valve)
(1) If a ball valve with a service port has been provided in the indoor unit as shown in Fig. 10, follow the instructions
given in (2) through (6) below. If the service port is instead located in the outdoor side, follow the instructions in
“5-2-3. Refrigerant recovery procedures (2).”
(2) After running the unit in Cooling mode for about 5 minutes as described in “5-2-1. Cooling operation (for all
units),” fully close the liquid tube ball valve.
(3) Run the unit in Cooling mode for 10 to 20 minutes more.
(4) Fully close the gas tube ball valve, and stop the operation of all units.
(5) Use hoses to connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder
with each other. (Fig. 10)Do each connection quickly to prevent air from entering the tubing.
CAUTION
Remaining refrigerant may create internal pressure, therefore care should be
taken when connecting the hoses.
(6) Recover the remaining refrigerant from the indoor unit using the refrigerant recovery unit.
NOTE
Manifold
gauge
Lo
To determine completion of refrigerant
recovery, follow the instructions that
came with the refrigerant recovery unit.
Hi
Refrigerant
recovery
unit
Refrigerant recovery cylinder
Ball valve (separately purchased)
Gas tube
Service port
Outdoor
unit
side
Indoor unit
Liquid tube
Fig. 10
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2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
5. Recovering Refrigerant
5-2-3. Refrigerant recovery procedures (2): Indoor unit with no ball valve equipped
Refrigerant in all indoor units and the refrigerant tubing circuit must be pumped into the outdoor unit. The maximum
refrigerant storage capacity per a single outdoor unit is approx. 529 oz. Thus, in order to collect all refrigerant from
the system, a separate refrigerant recovery unit is necessary. Follow these procedures to correctly perform pump
down.
Perform work correctly, according to the work procedures given below.
1 Connect the manifold gauge to the high- and low-pressure outlet ports on the outdoor unit where pump down
will be performed. Be sure that no air enters the tubing at this time.
2
Follow the instructions in “5-2-1. Cooling operation (for all units)” and operate all units in Cooling mode for
approximately 5 minutes. Then fully close the liquid tube valve on the outdoor unit where pump down will be
performed.
3
When the high-pressure gauge reaches 406.1 psi or higher, or the low-pressure gauge reaches 72.5 psi or
below, at the outdoor unit where pump down is being performed, press the ON/OFF button on the outdoor unit
maintenance remote controller to stop operation at all units. Then immediately fully close the suction tube valve
on the outdoor unit where pump down is being performed.
2
* If the outdoor unit maintenance remote controller is unavailable, follow the procedure below to stop all of the
units.
Pull out the SCT connector (2P) (YEL) (CN231) on the outdoor unit control PCB of the unit where pump down
is being performed. When the SCT connector is pulled out, immediately alarm F12 (sensor trouble) occurs
and all outdoor units stop operating. Be sure that you do NOT grasp the lead wire when pulling out the connector. Removing any other connector may not cause the units to stop. Therefore be sure to pull out the SCT
connector only.
CAUTION
It is not necessary to recover the refrigerant from the balance tube. Therefore do
not operate the balance tube valve.
4
Turn off power to all equipment in the system. Then pull out the RC1 connector (4P) (BLU) (CN106) on the outdoor control PCB in the outdoor unit for which pump down has been completed.
* By pulling out the RC1 connector, communication between the main and the sub outdoor units will be isolated.
5
Change the setting of controllable outdoor unit numbers (reduce by 1 unit).
* If the setting is incorrect, the E30 alarm (outdoor unit serial communication signal error) occurs and the unit
will not operate.
6
Turn on power for all equipment in the system and let the remaining outdoor units run in Cooling mode.
7
Repeat steps 1 and 2 and complete pump down for all outdoor units.
8
Using hoses with Schrader-type push-to-release valves, connect the manifold gauge valves to the suction line
service port, the discharge line service port and the liquid line service port in the next outdoor unit to undergo
pump down. (Fig. 11)
Remaining refrigerant in the system may cause internal pressure. Check that each
CAUTION
valve on the manifold gauge is tightly closed. A Schrader-type push-to-release
valve is provided for each connection port.
9
Use hoses to connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder.
Quickly connect each part to prevent air from entering the tubing.
10
Recover remaining refrigerant from the inter-unit tubing and indoor units using the refrigerant recovery unit.
NOTE
To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery
unit.
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Outdoor Unit Repair Procedures
5. Recovering Refrigerant
Manifold
gauge
Hi
Lo
Liquid tube service port
(For 5/16" (7.94mm)-dia.
connector)
Refrigerant
recover unit
2
Refrigerant
recovery cylinder
Gas tube service port
(For 5/16" (7.94mm)-dia. connector)
Fig. 11
5-3. Recovery of Refrigerant from Entire System
(1) Turn off power to the entire outdoor system.
(2) Short-circuit the AP (Air Purge) pins (CN102) on the outdoor control PCB of all outdoor units, then supply power
to the outdoor units.
* By short-circuiting the AP pins and supplying power to the outdoor units, the solenoid valve in each unit is
forcibly opened and all remaining refrigerant can be recovered.
(3) If any unit has encountered a power failure, follow the instructions in “5-1. Refrigerant Recovery Procedures
(from Outdoor Units)” and perform refrigerant recovery for the faulty outdoor unit.
(4) Connect the manifold gauge to the high- and low-pressure outlet ports (Schrader-type valves) on any outdoor
unit. (Fig. 11)
CAUTION
Remaining refrigerant may cause internal pressure. Check that each valve on the
manifold gauge valves is tightly closed. The connection port uses a Schrader-type
push-to-release valve.
(5) Connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder. Quickly connect
each part to prevent air from entering the tubing.
(6) Check that each service valve of the gas tubes, liquid tube, and the balance tube for the outdoor unit has opened,
then perform refrigerant recovery.
* If only a single outdoor unit is installed, the balance tube is not used. Therefore, leave this valve closed.
NOTE
To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery
unit.
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Outdoor Unit Repair Procedures
6. Checking for Leakage After Repair
6-1. Pressure Check for Leakage of Outdoor Unit
After completing repair of the outdoor unit, carry out the following leakage check.
(1) Check that all service valves for gas tubes, liquid tube, and balance tube in the repaired outdoor unit (units
necessary to carry out the pressurized leak check) are fully closed.
(2) Connect the manifold gauge valves to the high- and low-pressure outlet ports of the outdoor unit.
(3) Feed nitrogen gas into the circuit until 72.5 psi pressure is reached. If it is apparent that the nitrogen gas is not
entering the repaired section, interrupt the feeding. Short-circuit the AP pins (CN102) on the outdoor unit control
PCB, turn on power to run the outdoor unit, then resume feeding nitrogen.
(4) Apply soapy water to the repaired part (such as a newly brazed part), and briefly inspect for any leakage. If there
are any leaks, bubbles will show on the tubing surface.
2
* To continue the air-tight check after the brief leak inspection, turn on power while short-circuiting the AP pins.
Again feed nitrogen gas to obtain a system pressure of 72.5 psi. Then measure both the outdoor ambient
temperature and the pressure in the system. Leave the system in this state for 1 full day and night, and again
measure the outdoor ambient temperature and pressure (to determine any reduced values). During the
inspection, it is recommended that an awning or cover be used to shield the unit in case of rain. If no problem
is found, purge all nitrogen from the system.
Manifold
gauge
Lo
Hi
High-pressure outlet port
(For 5/16" (7.94mm)-dia.
connector)
Nitrogen gas
Low-pressure outlet port
(For 5/16" (7.94mm)-dia. connector)
Fig. 12
6-2. Checking for Leakage in Refrigerant Tubing Between Indoor and Outdoor Units
Refer to the “Installation Instructions” that came with the outdoor unit.
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Outdoor Unit Repair Procedures
7. Evacuating System
This procedure is carried out to ensure there is no remaining refrigerant or other gases (nitrogen, etc.) in the
repaired outdoor unit and tubing.
7-1. Evacuating Repaired Outdoor Unit
(1) Check that each service valve of the gas tubes, liquid tube, and balance tube in the outdoor unit are fully closed.
(2) Connect the manifold gauge valves to the high-pressure and low-pressure sensor outlets of the outdoor unit.
(Fig. 13)
(3) Connect the manifold gauge valves to the vacuum pump.
* If the AP pins (CN102) on the outdoor control PCB have already been short-circuited, step (4) is not necessary.
(4) Turn off power to the repaired outdoor unit and short-circuit the AP (Air Purge) pins on the outdoor control PCB.
CAUTION
By short-circuiting the AP pins and turning on power to the outdoor unit, all electronic valves in the outdoor unit are forcibly opened and any remaining nitrogen
gas can be recovered. Failure to perform this procedure may result in nitrogen gas
remaining in the refrigerant circuit and causing operating problems. Therefore,
never skip this step.
2
(5) Turn the power ON at the outdoor unit where vacuum will be applied. Then run the vacuum pump and continue
evacuation until the vacuum condition falls to less than –14.7 psig (5 Torr).
CAUTION
To ensure proper evacuation, refer to the operating instructions that came with the
vacuum pump.
Manifold
gauge
Lo
Hi
High-pressure outlet port
(For 5/16" (7.94mm)-dia.
connector)
Vacuum pump
Low-pressure outlet port
(For 5/16" (7.94mm)-dia. connector)
Fig. 13
7-2. Evacuating Refrigerant Tubing Between Indoor and Outdoor Units
Refer to the “Installation Instructions” that came with the outdoor unit.
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Outdoor Unit Repair Procedures
8. Charging Compressor Oil
8-1. If Refrigerant Has Already Been Charged to Outdoor Unit
Be sure to use an exclusive oil-charging tank for charging compressor oil. Prior to charging, carry out vacuum drying
inside the tank and take care that no air (in the form of bubbles) is permitted to enter the tank.
The oil charging procedures are given below.
* The receiver tank used for maintenance may be used as an exclusive oil-charging tank.
2
When installing the oil-charging
tank to the refrigerant system to
serve as a safety bypass circuit for
refrigerant, connect it to the gas
tube service port carefully to
avoid releasing refrigerant into the
atmosphere.
CAUTION
Perform oil charging
work carefully so that no
liquid refrigerant enters
the charging tank.
(DPR : CV623-081-7937)
Nipple
(Receiver-tank:
CV638-015-2988)
Packless valve
Fig. 14
(1) Evacuation drying in oil-charging tank
With the lower side valve fully closed, open the upper side valve and connect it to the vacuum pump via the
manifold gauge valves as shown below. Run the vacuum pump and evacuate the tank until the pressure falls to
below –14.7 psig (5 Torr) for the evacuation drying. After the evacuation drying is finished, fully close the upper
valve. Next, fully close the manifold gauge valves and stop the vacuum pump.
CAUTION
To ensure proper evacuation, refer to the operating instructions that came with the
vacuum pump.
Open
Manifold
gauge
Hi
Lo
Close
Upper side
valve
Close
Lower side
valve
Vacuum pump
Fig. 15
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Outdoor Unit Repair Procedures
8. Charging Compressor Oil
(2) Charging compressor oil into oil-charging tank
Connect a piece of pipe to the lower valve and then insert the other end deeply into the bottom of the oil container. Make sure you avoid letting any air be sucked into the tube. Next, run the vacuum pump and open the
manifold gauge valves, then open the upper and lower valves to begin charging oil into the charging tank.
Manifold
gauge
Close
Open
Close
Open
Upper valve
2
Lower valve
Vacuum pump
Oil
Fig. 16
When the predetermined amount of oil has been charged into the oil-charging tank, immediately close the lower
valve. Next, run the vacuum pump until the system pressure reaches lower than -14.7 psig (5 Torr).
Close the upper valve and then, stop the vacuum pump.
CAUTION
Do this operation quickly because compressor oil easily absorbs moisture from
the air.
(3) Charging compressor oil into outdoor unit
Connect the lower valve to the low-pressure outlet (with Schrader-type push-to-release valve) in the outdoor
unit to be oil-charged, and then connect the high-pressure outlet (with push-to-release valve) to the upper valve
via the manifold gauge valves (at Hi-pressure gauge side). In addition, connect the gas tube service port (with
push-to-release valve) to the DPR (Discharge Pressure Regulator). Carry out the connection work quickly to
avoid letting air enter.
• The hoses may be subject to internal pressure from the refrigerant inside the out
CAUTION
door unit. A Schrader-type push-to-release valve is provided at each connection
port.
• Since the DPR valve opens at pressures of 362.6 psi and above, be sure to connect the DPR to the gas tube service port (low-pressure side).
High-pressure
outlet port
(For 5/16"
(7.94mm)dia. connector)
Low-pressure
outlet port
(For 5/16"
(7.94mm)dia. connector)
DPR
Gas tube
service port
(For 5/16"
(7.94mm)dia. connector)
Upper valve
Lo
Manifold
gauge
Hi
se
Clo
Lower valve
se
Clo
Fig. 17
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Outdoor Unit Repair Procedures
8. Charging Compressor Oil
Next follow the instructions in “5-2-1. Cooling operation (for all units)” at the outdoor unit where oil will be charged,
and start cooling operation at all units. When the operating conditions have stabilized, perform steps 1, 2, and 3 in
sequence and open the valves. When this is done, the refrigerant pressure from operation forces the oil out of the
oil charge tank, and oil is charged into the outdoor unit from the low-pressure outlet port. From time to time close
the upper valve on the top of the oil charge tank (only this valve) and shake the tank to check the amount of
remaining oil.
High-pressure
outlet port
(For 5/16"
(7.94mm)dia. connector)
Low-pressure
outlet port
(For 5/16"
(7.94mm)dia. connector)
DPR
Gas tube
service port
(For 5/16"
(7.94mm)dia. connector)
2
Upper valve
Lo
Manifold
gauge
Hi
Procedure 2: Open
Procedure 1: Open
Lower valve
Connect from here to
refrigerant recovery unit
Procedure 3: Open
Fig. 18
To terminate the oil charging work, do as follows:
To end the charge process, first close the valve on the high-pressure side of the manifold gauge. Then wait several
tens of seconds after the pressure display on the manifold gauge low-pressure gauge stabilizes (in order to equalize
the pressure with the low-pressure outlet port and to vaporize the refrigerant in the charge tank). Then perform steps
1 and 3 in sequence and fully close the valves. Finally, connect the refrigerant recovery unit to the Lo-gauge side,
shut down all indoor and outdoor units, and then recover the remaining refrigerant in the oil-charging tank, manifold
gauge valves, and connecting hoses. Perform these procedures quickly and securely so that no air can enter.
After, charge the necessary amount of new refrigerant by referring to the “Installation Instructions” that came with the
outdoor unit.
NOTE
To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery
unit.
8-2. If Outdoor Unit Has Not Been Charged with Refrigerant
When a compressor has been replaced or in any other case where the outdoor unit has not been charged with
refrigerant, first charge with refrigerant then follow the instructions in “8-1. If Refrigerant Has Already Been
Charged to Outdoor Unit” and charge with oil.
Or, alternatively, follow the procedure below.
(1) Connect a tube to the oil outlet port on the outdoor unit to be charged with oil. Insert the other end of the tube
into the oil container.
(2) Follow the instructions in “7. Evacuating System,” and apply vacuum to the outdoor unit to be charged with oil.
When this is done, oil is charged into the outdoor unit through the oil outlet port.
(3) When the unit has been charged with the designated amount of oil, stop the vacuum pump.
CAUTION
The oil absorbs moisture readily. This work must be completed quickly.
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Outdoor Unit Repair Procedures
8. Charging Compressor Oil
Oil tube outlet port
(For 1/4" (6.35mm)-dia. connector)
High-pressure
outlet port (For 5/16"
(7.94mm)-dia.
connector)
Oil
Manifold
gauge
Hi
Lo
Vacuum pump
Fig. 19
2
Low-pressure outlet port
(For 5/16" (7.94mm)-dia. connector)
8-3. Charging Additional Compressor Oil (after replacing compressor)
The rated amount of oil is pre-charged in the compressors as given below:
Model name
Compressor model
Q'ty
Pre-charged amount of oil (liters)
U-72ME1U9
U-72ME1U9E
C-9RVN273H0S
(Inverter-controlled rotary compressor)
1
1.9
U-96ME1U9
U-96ME1U9E
C-9RVN273H0S
(Inverter-controlled rotary compressor)
1
1.9
JT160G-KTTJ
(Constant-speed scroll compressor)
1
2.1
When replacing a faulty compressor, be sure to first measure the amount of remaining oil in the compressor.
Charge additional new oil equal to the difference in the remaining oil and the rated amount as listed above.
For example: Type of replaced compressor: JT160G-KTTJ
Remaining oil in the removed compressor: 0.58 gal
Additional oil to be charged:
0.58 gal (remaining oil in the removed compressor) – 0.55 gal (rated oil amount) = 0.026 gal
* If the result is a negative amount (remaining oil in the removed compressor is less than the rated amount), it is
not necessary to discharge the extra oil from the system.
For the method used for additional oil charging after compressor replacement, refer to “8-1. If Refrigerant Has
Already Been Charged to Outdoor Unit.”
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9. Pumping Out Refrigerant from Outdoor Unit
2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
Required equipment and tools: Jumper wire with clips, adjustable wrench, set of manifold gauge valves for the
refrigerant R410A, refrigerant recovery unit, pre-purged refrigerant cylinder for
recovery, flat-head screwdriver, and outdoor unit maintenance remote controller.
This work is performed in order to collect the refrigerant from an outdoor unit where repairs (other than compressor
replacement) will be performed into other outdoor units and indoor units, and the refrigerant tubing.
9-1. If Remote Controller (CZ-RTC2) is Used for Maintenance of Outdoor Unit
(1) Refer to “4. Backup Operation” and perform backup operation.
(2) Connect the manifold gauge valves at the Lo side to the low-pressure outlet port of the outdoor unit to be
repaired. Also connect the refrigerant recovery cylinder to any one of the normal outdoor units at the liquid line
service port (Schrader-type push-to-release valve). Perform the connection work quickly so that no air is
allowed to enter. (Fig. 20)
2
* Connecting the refrigerant recovery cylinder is done to prevent pressure from rising excessively during backup
operation by recovering the refrigerant from the outdoor unit to be repaired.
(Measure the weight of the refrigerant and cylinder itself beforehand and provide sufficient safety measures,
such as installing a high-pressure cutout in the circuit.)
CAUTION
The hoses may be subject to internal pressure from the refrigerant inside the outdoor unit. Check that the manifold gauge valves are fully closed beforehand.
A Schrader-type push-to-release valve is provided at each connection port.
(3) Connect the outdoor unit maintenance remote controller to the RC connector (CN006) (3P) (BLU) on the outdoor unit control PCB of the outdoor unit to be repaired. Then start a test run of all units. (Press and hold the
(CHECK) button for 4 seconds or longer.)
(4) Use the outdoor unit maintenance remote controller to check the operating status of the indoor units. Check
that all units are operating in Heating mode. For details concerning operation of the outdoor unit maintenance
remote controller, refer to the “Outdoor unit maintenance remote controller” item. It is also possible to check the
operating conditions either in cooling or heating mode by touching the gas tube.
Cooling mode : low temperature (68 F or lower)
Heating mode : high temperature (140 F or higher)
CAUTION
The gas tubing becomes hot (140 F or higher) in heating. Be careful so as not to be
burnt when touching the tubing.
(5) Close the suction tube and balance tube on the outdoor unit to be repaired. Then slowly close the liquid tube
service valve.
(6) When the low pressure at the outdoor unit to be repaired reaches 72.5 psi or below, press the ON/OFF button
on the outdoor unit maintenance remote controller to stop all the units. Then immediately fully close the gas
tube valve on that outdoor unit.
CAUTION
While closing the valves, the rise in discharge temperature or another factor may
cause a protective device to activate, stopping the operation of the outdoor unit.
If this occurs, immediately fully close the gas tube valve on the outdoor unit to be
repaired.
(7) Connect the high-pressure gauge side of the manifold gauge to the high-pressure outlet port on the outdoor unit
to be repaired, and connect the manifold gauge to the refrigerant recovery device. Be sure that no air enters the
tubing at this time.
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9. Pumping Out Refrigerant from Outdoor Unit
2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
(8) Short-circuit the vacuum application pin on the outdoor unit control PCB of the unit to be repaired. Then turn ON
the outdoor unit power.
CAUTION
When the vacuum application pin is short-circuited and the power is turned ON, all
solenoid valves in the outdoor unit are forced open, allowing the refrigerant to be
recovered from all tubes which are separated by solenoid valves. If this work is not
performed, it will not be possible to recover all of the refrigerant at the refrigerant
recovery device. Be sure to perform this step.
Open both Hi- and Lo-side valves on the manifold gauge valves, and recover the refrigerant remaining in
the outdoor unit. After that, measure the amount of recovered refrigerant.
NOTE
To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery
unit.
2
9-2. If Remote Controller is Not Available for maintenance of Outdoor Unit
(1) Refer to “4. Backup Operation” and perform backup operation.
(2) Connect the manifold gauge valves at the Lo side to the low-pressure outlet port of the outdoor unit to be
repaired. Also connect the refrigerant recovery cylinder to any one of the normal outdoor units at the liquid line
service port (Schrader-type push-to-release valve). Perform the connection work quickly so that no air is
allowed to enter. (Fig. 20)
* Connecting the refrigerant recovery cylinder is done to prevent pressure from rising excessively during the
backup operation by recovering the refrigerant from the outdoor unit to be repaired.
(Measure the weight of the refrigerant and cylinder itself beforehand and provide sufficient safety measures,
such as installing a high-pressure cutout in the circuit.)
CAUTION
The hoses may be subject to internal pressure from the refrigerant inside the outdoor unit. Check that the manifold gauge valves are fully closed beforehand.
A Schrader-type push-to-release valve is provided at each connection port.
(3) Determine the outdoor unit where the unit No. setting (S007)(3P DIP switch)(BLU) on the outdoor unit control
PCB is set to No.1.
(4) Short-circuit the test-run pin (CN023) to start operation.
(5) Leave the unit running for a while, and then touch the gas tubing with fingers to determine whether the unit is
running in cooling or heating mode. If it is in heating, follow the step (6) and later procedures.
Cooling : low temperature (68 F or lower)
Heating : high temperature (140 F or higher)
CAUTION
The gas tubing becomes hot (140 F or higher) in heating mode. Be careful so as
not to be burnt when touching the tubing.
(6) When the unit is operating in heating mode, release the short-circuit at the test-run pin on the outdoor unit control PCB of the No. 1 unit. Then short-circuit the stop pin (CN104) to stop operation.
(7) Short-circuit the mode-change pin (CN101) on the outdoor unit control PCB of the No. 1 unit.
* Switching of the 4-way valve occurs immediately before operation starts. Therefore it does not change at this
time. (Mode change cannot be judged from the sound.)
(8) Short-circuit the test-run pin (CN023) to start operation, leave the unit running for a while. Touch the gas tubing
with fingers to determine whether the unit is running in cooling.
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9. Pumping Out Refrigerant from Outdoor Unit
2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
(9) Close the gas tube and balance tube on the outdoor unit to be repaired. Then slowly close the liquid tube service valve.
* When the low pressure at the outdoor unit to be repaired reaches 72.5 psi or below, pull out the SCT connector (2P) (YEL) (CN231) from the outdoor unit control PCB of that outdoor unit. Then immediately fully close
the gas tube valve on that outdoor unit.
* Pulling out the SCT connector immediately stops all of the outdoor units.
CAUTION
While closing the valves, the rise in discharge temperature or another factor may
cause a protective device to activate, stopping the operation of the outdoor unit.
If this occurs, immediately fully close the gas tube valve on the outdoor unit to be
repaired.
(10) Connect the high-pressure gauge side of the manifold gauge to the high-pressure outlet port on the outdoor
unit to be repaired, and connect the manifold gauge to the refrigerant recovery device. Be sure that no air
enters the tubing at this time.
2
(11) Open both Hi- and Lo-side valves on the manifold gauge valves, and recover the refrigerant remaining in the
outdoor unit. After that, measure the amount of recovered refrigerant.
NOTE
To determine the completion of refrigerant recovery, follow the instructions that came with the
refrigerant recovery unit.
Faulty outdoor unit
High-pressure outlet port
(For 5/16" (7.94mm)-dia.
connector)
Other outdoor unit
Low-pressure outlet port
(For 5/16" (7.94mm)-dia.
connector)
Liquid tube service port
(For 5/16" (7.94mm)-dia.
connector)
Manifold
gauge
Refrigerant
recovery
cylinder
Measuring scale
Connect from here to
refrigerant recovery unit
Fig. 20
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Outdoor Unit Repair Procedures
10. Compressor
10-1. Compressor Trouble Diagnosis and Check Methods
Generally, compressor failures can be classified into the following categories.
(1) Mechanical trouble
(A) Locking (intrusion of foreign objects, galling, etc.)
(B) Pressure rise failure (damaged valve, seal, bearing, or other component)
(C) Noise (damaged stator rotor, valve, or other component)
(2) Electrical trouble
(A) Coil burning
(B) Open circuit
(C) Insulation failure
(D) Short circuit
Trouble diagnosis is based on the following remote controller displays: [H03] (Compressor 1: INV compressor,
center), [H11] [H12] [H13] (Compressor 2: constant-speed compressor 1, left side when viewed from front), [H21]
[H22] [H23]. A judgment is made based on factors that include the following: coil resistance (varies depending on the
compressor), insulation resistance, current, leakage breaker operation, oil and refrigerant fouling, odor, pressure,
and noise.
2
Reference: Insulation resistance (Use a DC 500 V insulation resistance meter and measure the insulation resistance between the electrified and non-electrified parts.)
(a) Motor
Min. 300 M
(b) Compressor
Min. 100 M
(c) Unit
Min. 10 M (This is due to the presence of refrigerant, which decreases the
insulation resistance.)
(servicing part)
* Minimum insulation resistance as required by generally accepted requirements is 1 M .
JUDGMENT START
Is there burning of the failed
compressor motor?
NO
YES
Follow the instructions in
“3. Discharging Compressor Oil” and
drain the oil from all compressors in the
same system. Then inspect.
Follow the instructions in
“3. Discharging Compressor Oil”
and drain the oil from the failed
compressor. Then inspect.
YES
Is the color phase 4.0 or above, or is a
sharp odor present?
NO
Are there 2 or more outdoor units where
the compressor oil color phase is 4.0 or
higher or where a sharp odor is
NO
present?
YES
Go to “10-2-3. Replacing all
compressors in a system.”
Go to “10-2-2. Replacing all
compressors in a failed unit.”
Follow the instructions in “10-2-4. Dry
core cleaning” and perform dry core
cleaning of all outdoor units.
Follow the instructions in
“10-2-4. Dry core cleaning” and
perform dry core cleaning of the
failed outdoor unit.
Go to “10-2-1. Replacing only the
failed compressor.”
Reference: Symptoms of motor burning
1. Ground fault results in breaker operation.
2. Short circuit results in different coil resistance at different phases.
3. Open circuit
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Outdoor Unit Repair Procedures
10. Compressor
10-2. Replacing the Compressor(s)
10-2-1. Replacing only the failed compressor
(1) If backup operation is required, follow the instructions in “4. Backup Operation” and engage backup operation.
(2) Follow the instructions in “10-3. Removing and Installing Compressors” and replace the failed compressor.
(3) Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump.
(4) Disconnect the manifold gauge from vacuum pump. Connect the manifold gauge to the cylinder where the
refrigerant was recovered. At this time, be careful that air does not enter the tubing.
2
(5) Open the valve on the refrigerant recovery cylinder and the high-pressure gauge valve on the manifold gauge
to charge with refrigerant. At this time, the low-pressure gauge valve on the manifold gauge remains fully
closed.
If the recovered refrigerant becomes mixed with another refrigerant or another gas
CAUTION
(such as nitrogen or air), do not use the recovered refrigerant for charging. Charge
with the designated amount of new refrigerant.
(6) When charging has been completed with an amount of new refrigerant equal to the amount of recovered
refrigerant, or when charging with the same amount of new refrigerant has not been completed but no more
refrigerant will enter the unit, fully close the high-pressure gauge valve on the manifold gauge. Next, turn the
power OFF at the repaired outdoor unit, then remove the short circuit at the AP pin (CN102). Finally, fully
open all valves on the gas tube, liquid tube, and balance tube.
However, leave the balance tube fully closed if only a single outdoor unit is installed.
(7) If backup operation was engaged, follow the instructions in “4. Backup Operation” and perform backup operation recovery.
(8) If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was not possible,
fully close the high-pressure gauge valve on the manifold gauge. Then, while the unit is operating in “5-2-1.
Cooling operation (for all units)”, open the low-pressure gauge valve on the manifold gauge and charge with
the designated amount of refrigerant.
CAUTION
When charging with liquid refrigerant, add refrigerant a little at a time in order to
prevent liquid back-flow.
(9) Fully close the low-pressure gauge valves on the manifold gauge, follow the instructions in “8. Charging Compressor Oil,” and charge with oil if necessary.
(10) Remove the manifold gauge.
CAUTION
The connecting port employs a Schrader-type push-to-release valve. When disconnecting the hose, pressure will be applied from the refrigerant in the outdoor unit.
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2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
10. Compressor
10-2-2. Replacing all compressors in a failed unit
(1) Follow the instructions in “3. Discharging Compressor Oil” and drain the oil from the oil separator in the failed
unit. Measure the amount of drained oil.
(2) If backup operation is required, follow the instructions in “4. Backup Operation” and engage backup operation.
(3) Follow the instructions in “10-3. Removing and Installing Compressors” and replace all compressors in the
failed unit.
(4) Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump.
(5) Disconnect the manifold gauge from the vacuum pump. Connect the manifold gauge to the refrigerant cylinder.
At this time, be careful that air does not enter the tubing.
CAUTION
Do not reuse the recovered refrigerant. Use a refrigerant cylinder that contains new
refrigerant.
(6) Open the valve on the refrigerant cylinder, and open the high-pressure gauge valve on the manifold gauge (with
the low-pressure gauge valve closed). When charging has been completed with an amount of new refrigerant
equal to the amount of recovered refrigerant, or when charging with the same amount of new refrigerant has
not been completed but no more refrigerant will enter the unit, fully close the high-pressure gauge valve on the
manifold gauge. Next, turn the power OFF at the repaired outdoor unit, then remove the short circuit at the AP
pin (CN102). Finally, fully open all valves on the gas tube, liquid tube, and balance tube.
However, leave the balance tube fully closed if only a single outdoor unit is installed.
2
(7) If backup operation was engaged, follow the instructions in “4. Backup Operation” and perform backup operation recovery.
(8) If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was not possible,
fully close the high-pressure gauge valve on the manifold gauge. Then, while the unit is operating according
to “5-2-1. Cooling operation (for all units),” open the low-pressure gauge valve on the manifold gauge and
charge with the designated amount of refrigerant.
CAUTION
When charging with liquid refrigerant, add refrigerant a little at a time in order to
prevent liquid back-flow.
(9) Fully close the low-pressure gauge valves on the manifold gauge, follow the instructions in “8. Charging Compressor Oil,” and charge with the necessary amount of oil. Also add an amount of oil that is equivalent to the
amount that was drained from the oil separator.
(10) Remove the manifold gauge.
CAUTION
The connecting port employs a Schrader-type push-to-release valve. When disconnecting the hose, pressure will be applied from the refrigerant in the outdoor unit.
(11) Follow the instructions in “10-2-4. Dry core cleaning” and perform dry core cleaning of the outdoor unit that
failed.
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Outdoor Unit Repair Procedures
10. Compressor
10-2-3. Replacing all compressors in a system
(1) Follow the instructions in “3. Discharging Compressor Oil” and drain the oil from the oil separators in all outdoor units. Measure the amount of drained oil.
(2) Follow the instructions in “10-3. Removing and Installing Compressors” and replace all compressors in the
system.
(3) Follow the instructions in “6. Checking for Leakage After Repair” and check for leaks at all outdoor units and
in the tubing.
(4) Follow the instructions in “7. Evacuating System” and apply vacuum to all outdoor units and tubing.
(5) Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump.
(6) Disconnect the manifold gauge from vacuum pump. Connect the manifold gauge to the refrigerant cylinder.
Be especially careful that air does not enter the tubing.
2
CAUTION
Do not reuse the recovered refrigerant. Use a refrigerant cylinder that contains unused refrigerant.
(7) Open the valve on the refrigerant cylinder, and open the high-pressure gauge valve on the manifold gauge.
When charging has been completed with an amount of new refrigerant equal to the amount of recovered refrigerant, or when charging with the same amount of new refrigerant has not been completed but no more refrigerant will enter the unit, first turn the power OFF at the repaired outdoor unit, then remove the short circuit at the
AP pin (CN102). Then fully open all valves on the gas tube, liquid tube, and balance tube.
However, leave the balance tube fully closed if only a single outdoor unit is installed.
(8) If backup operation was engaged, follow the instructions in “4. Backup Operation” and perform backup operation recovery.
(9) If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was not possible,
fully close the high-pressure gauge valve on the manifold gauge. Then, while the unit is operating in Cooling
mode, open the low-pressure gauge valve on the manifold gauge and charge with the designated amount of
refrigerant.
CAUTION
When charging with liquid refrigerant, add refrigerant a little at a time in order to
prevent liquid back-flow.
(10) Fully close the low-pressure gauge valves on the manifold gauge, follow the instructions in “8. Charging Compressor Oil,” and charge with the necessary amount of oil. Also add an amount of oil that is equivalent to the
amount that was drained from the oil separators.
(11) Remove the manifold gauge.
CAUTION
The connecting port employs a Schrader-type valve. When disconnecting the hose,
pressure will be applied from the refrigerant in the outdoor unit.
(12) Follow the instructions in “10-2-4. Dry core cleaning” and perform dry core cleaning of all outdoor units.
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Outdoor Unit Repair Procedures
10. Compressor
10-2-4. Dry core cleaning
If burning or other failures occur repeatedly at compressors within the same system, in many cases the cause is
acid, sludge, carbon, or other substances that remain in the refrigeration cycle as the result of insufficient cleaning.
If, when the oil is inspected, there is an outdoor unit where the oil color phase is 4.0 or higher, or where a sharp
odor is present, carry out all steps below to perform dry core cleaning.
And use the bidirectional dry core for refrigerant R410A.
(A) If a ball valve is installed on the outdoor unit
(1) Refer to “5-2-1. Cooling operation (for all units)” and operate all outdoor units in either Heating or Cooling mode.
(2) If all units are operated in Cooling mode, close first the liquid tube service valve then the ball valve on all outdoor units where dry cores will be attached.
If all units are operated in Heating mode, close first the ball valve then the liquid tube service valve on all outdoor units where dry cores will be attached.
* This step is performed in order to expel refrigerant from the tubing between the liquid tube service valve and
the ball valve. Approximately 4 – 5 seconds is a sufficient interval between closing each of the 2 valves.
2
(3) Press the ON/OFF button on the outdoor unit maintenance remote controller to stop the operation of all units.
* If the outdoor unit maintenance remote controller is not available, use the following method to stop the operation of all units:
Pull out the SCT connector (2P) (YEL) (CN231) from the outdoor unit control PCB of the unit where pump-down
is being performed. When the SCT connector is pulled out, alarm F12 (sensor trouble) immediately occurs and
all outdoor units stop operating. Be sure that you do NOT grasp the lead wire when pulling out the connector.
Removing any other connector may not cause the units to stop. Therefore be sure to pull out only the SCT
connector.
(4) Connect a refrigerant recovery device to the liquid tube service port (Schrader-type valve) of all outdoor units
where dry cores will be attached, then recover the refrigerant from the tubing. Be sure that no air enters the
tubing at this time.
When the hose is connected, internal pressure is applied by the remaining refrigerant in the inter-unit tubing. The connection port employs a Schrader-type valve. To
CAUTION
determine when refrigerant recovery is compete, follow the instructions in the
instruction manual of the refrigerant recovery device.
(5) As shown in Fig. 21, disconnect the tube that runs from the liquid tube valve to the ball valve on all outdoor
units where dry cores will be attached. Then attach the dry cores.
(6) At all outdoor units where dry cores are attached, pressurize with 478.6 psi of nitrogen from the liquid tube
service port and check for leaks.
(7) After evacuating all nitrogen gas from the tubing, apply vacuum from the liquid tube service port to all outdoor
units where dry cores are attached until the pressure is –14.7 psig (5 Torr) or less.
(8) Fully open the liquid tube valve and ball valve on all outdoor units where dry cores are attached.
(9) Operate all outdoor units for approximately 3 hours (in either Heating or Cooling mode or mixed Cooling and
Heating mode).
(10) Follow the above procedure, and replace all dry cores with new dry cores.
(11) Operate all outdoor units for approximately 20 minutes (in either Heating or Cooling mode or mixed Cooling
and Heating mode).
(12) Follow the instructions in “3. Discharging Compressor Oil” and drain a small amount of the oil from the oil
separators of all outdoor units where dry cores are attached. Check the color phase, odor, and other
characteristics.
(13) If the results show that dry core cleaning is still necessary (for example, a color phase of 4.0 or higher)*,
return to Step 11 and repeat until the results are normal (including a color phase of 3.5 or less)*.
* Color sample sheet for degree of stain
CAUTION
Perform another dry core replacement after approximately 30 hours of system
operation.
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Outdoor Unit Repair Procedures
10. Compressor
(14) Perform steps (1) – (4), and remove all dry cores. Then connect the tubing between the liquid (narrow) tube
valves and the ball valves.
(15) At all outdoor units where dry cores were removed, pressurize with 478.6 psi of nitrogen from the liquid tube
service port and check for leaks.
(16) After evacuating all nitrogen gas from the tubing, apply vacuum to all outdoor units where dry cores were
removed until the pressure is –14.7 psig (5 Torr) or less.
(17) INSTALLATION: Refer to the “Information for the Person in Charge of Installation” items. Charge with an
amount of refrigerant equal to the amount that was recovered.
(B) If a ball valve is not installed on the outdoor unit
2
(1) Refer to “5-2-3. Refrigerant recovery procedures (2) : Indoor unit with no ball valve equipped.” Perform
pump down of the refrigerant from all indoor units and inter-unit tubing to the outdoor unit side.
(2) Cut the liquid (narrow) tube at all outdoor units where dry cores will be attached, then attach the dry cores
and ball valves as shown in Fig. 21.
(3) For the next steps, refer to (6) – (17) in (A) on the previous page.
Cleaning dry core
Outdoor unit
Liquid tube service valve
Normal unit
Gas tube
Balance tube
Dry core (bidirectional:
for R410A refrigerant)
Ball valve
Liquid tube
Fig. 21
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Outdoor Unit Repair Procedures
10. Compressor
10-3. Removing and Installing Compressors
When removing and installing compressors, use sufficient caution to ensure that moisture or other substances do
not enter the refrigerant tubing system.
10-3-1. Replacing compressors
* For types 72 and 96, follow the replacement procedure below.
(A) Replacing the inverter compressor (Compressor 1 on remote controller alarm display)
Removal
(1) Connect a manifold gauge to the high- and low-pressure outlet ports at the outdoor unit where the compressor
will be replaced. Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement in
the outdoor unit tubings.
(2) Follow the instructions in “1. Removing Panels” and “2. Removing Electrical Component Box and Duct” and
remove the corresponding parts from the outdoor unit where the compressor will be replaced.
(3) Remove the cap at the compressor terminal plate. Disconnect the power terminal.
2
(4) Remove the crankcase heater.
(5) Remove the 3 bolts, and remove the washers and rubber washers (quantities indicated in the figure below).
(6) Disconnect the tube-with-flare-nut using two adjustable wrenches. At this time, cover the tube in place with
waste cloth while watching out for oil leaks. Then cap the disconnected tube and mount the flare nut on the
compressor. Tighten the flare nut with a seal bonnet (1/4") in it.
NOTE
If oil remaining in the compressor reaches the equalized oil level, oil will come pouring out when the
tube-with-flare-nut is removed.
(7) Prepare to disconnect the 2 brazed locations shown in the figure.
CAUTION
Protect the sensors and the surrounding plates, rubber, lead wires, clamps, and
other items. Remove the discharge sensor shown in the figure 22.
(8) Disconnect the 2 brazed locations shown in the figure below.
(9) Pull the compressor toward you.
CAUTION
When pulling the compressor toward you, be careful not to cause any abnormal
deformation of the tube-with-flare-nut.
Remove the
discharge sensor
Inverter compressor
Bolt
Washer (1)
Rubber washer (1)
Brazed locations (2)
Tube-with-flare-nut
Bolt
Washer (1)
Rubber washer (1)
Bolt
Washer (1)
Rubber washer (1)
Crankcase heater
Front view
Fig. 22
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Outdoor Unit Repair Procedures
10. Compressor
Installation
(1) Remove the rubber stopper and tube cap (brazed) from the new compressor.
(2) Install the crankcase heater onto the new compressor.
(3) Place the 2 pieces of cushioning rubber in the designated positions on the compressor.
(4) Place the 2 pieces of cushioning rubber onto the legs of the new compressor.
CAUTION
When setting the compressor into the unit, be careful not to cause any abnormal
deformation of the tube-with-flare-nut.
(5) Place the remaining cushioning rubber onto the new compressor, at the position shown in the figure below.
(6) Remove the bolts that are temporarily fastening the pieces of cushioning rubber (inner 2 legs), and anchor
the 3 compressor legs using the bolts, washers, and rubber washers.
(7) Remove the flare nut from the new compressor, and connect the tube-with-flare-nut.
2
(8) Shape the tubes and insert them at the 2 brazing locations.
(9) Connect a manifold gauge to the high- and low-pressure outlet ports at the outdoor unit where the compressor was replaced. Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement.
(10) Perform copper brazing at the 2 brazing locations.
(11) Follow the instructions in “6. Checking for Leakage After Repair” and check for leaks at the outdoor unit
where the compressor was replaced.
CAUTION
At this time, also check for leaks at the flare nut connection on the tube-with-flare-nut.
(12) Re-install all components that were removed. Re-install the electrical component box in the same position as
it was before.
Be sure to check for looseness of the power terminal connection at the compressor
CAUTION
terminal plate, and to check by pulling vertically on the connections. If the terminals become disconnected easily, replace the wiring Assy.
(13) Follow the instructions in “7. Evacuating System” and apply vacuum to the outdoor unit where the compressor was replaced.
Brazed
locations (2)
Tube-with-flare-nut
Front view
Cushioning rubber
(Temporary fastening
bolts - 2 inner legs)
Crankcase
heater
Cushioning rubber
(Inner 1 leg)
Fig. 23
Bolt
Washer (1)
Rubber washer (1)
Fig. 24
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Outdoor Unit Repair Procedures
10. Compressor
(B) Replacing the constant-speed compressor 1
(Compressor 2 on remote controller alarm display)
Removal
(1) Connect the manifold gauge to the high- and low-pressure outlet ports at the outdoor unit where the compressor will be replaced. Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement.
(2) Follow the instructions in “1. Removing Panels” and “2. Removing Electrical Component Box and Duct” and
remove the corresponding parts from the outdoor unit where the compressor will be replaced.
(3) Remove the cap at the compressor terminal plate. Disconnect the power terminal.
(4) Remove the crankcase heater.
(5) Remove the bolts(3 locations), washers, and spacers (1 each at the 3 locations shown in the figure).
* The compressor rear leg is not anchored.
2
(6) Prepare to disconnect the 3 brazed locations shown in the figure.
Constant-speed
compressor
(left side)
Brazed locations (3)
Remove
discharge sensor
Protect the oil
equalizer tube
connectors
Bolt
Washer: 1
Rubber washer: 1
(1 each at the 3 locations)
Crankcase heater
Front view (Type 96)
Fig. 25
CAUTION
• Protect the sensors and surrounding plates, rubber, lead wires, clamps, and
other items.
Pay particular attention to protection of the oil equalizer tube connector parts,
and removal of the discharge sensor.
An O-ring is mounted inside the oil equalizer tube connector parts. It must be
protected and do not lose it.
(7) Disconnect the 3 brazed locations shown in the figure 25.
* First disconnect the ø1/4" (ø6.35 mm) tube, then disconnect the ø1/2" (ø12.7 mm) and ø7/8" (ø22.22 mm)
tubes.
(8) Pull the compressor toward you.
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Outdoor Unit Repair Procedures
10. Compressor
Installation
(1) Remove the 2 brazed tube caps (2 pieces) from the compressor.
(2) Remove hexagonal caps from the compressor.
* When removing the hexagonal caps, hold the fixing nut at the main unit side so as not to loose it with a
wrench or spanner. And then, loosen and remove the hexagonal cap.
Hexagonal cap
Oil equalizer tube
connector parts
2
Fixing nut
at the main unit side
O-ring
Fig. 26
(3) Remove the oil equalizer tube connector parts along with the O-ring from the removed compressor and
mount them on the replaced new compressor.
(4) Install the crankcase heater onto the new compressor.
(5) Temporary mount 2 cushion rubbers with bolts at the position as shown in the figure 27.
Set up the leg of the new compressor onto the 2 cushion rubbers.
Cushion rubbers
Bolts
(Temporary mounting: 2 locations
at back side, each 1 piece)
Front view
Fig. 27
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Outdoor Unit Repair Procedures
10. Compressor
Brazing
locations (3)
Bolt
Washer: 1
Rubber washer: 1
(1 each at the 3 locations)
Protect the oil
equalizer tube
connectors
Cushioning
rubber guide
2
Front view
Fig. 28
(6) Set the remaining cushioning rubber beneath the new compressor leg at the locations shown in the figure 28.
(7) Remove the bolts which are temporarily fastening the 2 pieces of cushioning rubber, and anchor the 3 compressor legs using the bolts, washers, and rubber washers.
(8) Insert the pre-shaped tube assembly at the 3 brazing locations indicated.
(9) Connect the manifold gauge to the high- and low-pressure outlet ports at the outdoor unit where the compressor was replaced. Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement.
(10) Perform copper brazing at the 3 brazing locations.
CAUTION
In the same way as during removal, pay particular attention to protection of the oil
equalizing tube connector parts shown in the figure 28.
An O-ring is mounted inside the oil equalizer tube connector parts. It must be protected and do not lose it.
(11) Follow the instructions in “6. Checking for Leakage After Repair” and check for leaks at the outdoor unit
where the compressor was replaced.
(12) Re-install all components that were removed. Re-install the electrical component box in the same position as
it was before.
Be sure to check for looseness of the power terminal connection at the compress or
CAUTION
terminal plate, and to check by pulling vertically on the connections. If the terminals become disconnected easily, replace the wiring Assy.
(13) Follow the instructions in “7. Evacuating System” and apply vacuum to the outdoor unit where the compressor was replaced.
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Outdoor Unit Repair Procedures
10. Compressor
(C) Replacing multiple compressors
Removal
(1) Follow the instructions in “(A) Replacing the inverter compressor,” “(B) Replacing constant-speed compressor,”
and remove the compressors.
* There is no predetermined sequence for removal; any compressor may be removed first.
Installation
(1) Follow the instructions in “(A) Replacing the inverter compressor,” “(B) Replacing constant-speed compressor,”
and install the compressors.
* There is no predetermined sequence for installation; any compressor may be installed first.
2
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Outdoor Unit Repair Procedures
11. High and Low Pressure Sensors
The outdoor unit connection ports for the high and low pressure sensors employ Schrader-type push-to-release
valves. Therefore it is not necessary to recover refrigerant when removing and installing them.
11-1. Removing the High and Low Pressure Sensor
(1) Follow the instructions in “1. Removing Panels” and “2. Removing Electrical Component Box and Duct” and
remove the corresponding components from the outdoor unit where the high pressure sensor will be
removed.
(2) Disconnect the high & low pressure sensor connector socket (3P) (BLK) & (WHT) from terminals CN009 and
CN024 on the outdoor unit control PCB of the outdoor unit where the high & low pressure sensor will be
removed.
(3) Use 2 adjustable wrenches in combination to remove the high & low pressure sensors.
CAUTION
When removing the high & low pressure sensors, internal pressure will be applied by
the refrigerant in the outdoor unit. The high & low pressure sensor connection ports on
the outdoor unit employs a Schrader-type valve.
2
11-2. Installing the High and Low Pressure Sensors
(1) Use 2 adjustable wrenches in combination to install the high and low pressure sensors.
High pressure
sensor
Low pressure
sensor
Fig. 29
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Outdoor Unit Repair Procedures
12. Replacing 4-way Valve
When replacing 4-way valve of type 96 (for type with 1 or 2 compressor), be sure to protect check valves, which are
located adjacent to the 4-way valve, while performing replacement work. Type 72 (for type with 1 compressor) is
not located near to the check valves, therefore no protection is necessary.
12-1. When the replacement is available from the right side of the unit
(1) Remove the front panel of the outdoor unit, then remove the right side panel of the unit.
(2) Follow the instructions in “9. Pumping Out Refrigerant from Outdoor Unit”, recover the refrigerant of the outdoor unit where the 4-way valve is located.
(3) Connect the manifold gauge to the high and low-pressure outlet ports at the outdoor unit where the 4-way
valve will be replaced. Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement.
(4) Prepare the brazing kit to disconnect the brazed parts (4 locations).
2
CAUTION
Protect the check valves as shown in the figure 30.
Check valve
4-way valve
Brazed parts
(4 locations)
Fig. 30
(5) After replacing the 4-way valve, follow the instructions in “6. Checking for Leakage After Repair”, and “7.
Evacuating System”. The outdoor unit after replaced 4-way valve shall be checked for gas leakage and perform system evacuation.
(6) Fully open service valves on the outdoor unit.
However, if only one outdoor unit is installed, leave the balance tube kept closed.
(7) Charge the recovered refrigerant with the Refrigerant Recovery Unit by referring to the Installation Instructions that came with the outdoor unit and the refrigerant recovery unit.
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Outdoor Unit Repair Procedures
12. Replacing 4-way Valve
12-2. When the replacement is not available from the right side of the unit
(1) Follow the instructions of “10. Compressor” and remove the constant-speed compressor 2.
(2) Connect the manifold gauge to the high and low-pressure outlet ports at the outdoor unit where the 4-way valve
will be replaced. Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement.
(3) Prepare the brazing kit to disconnect the brazed parts (4 locations).
CAUTION
Protect the check valves as shown in the figure 31.
Check valve
2
4-way valve
Brazed parts
(4 locations)
Fig. 31
(4) After replacing the 4-way valve, follow the instructionsin “10. Compressor”, and reinstall the removed constantspeed compressor 2 in the outdoor unit.
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Outdoor Unit Maintenance Remote Controller
Contents
3. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER
1. Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
2. Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3. Ordinary Display Controls and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
4. Monitoring Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
5. Outdoor Unit Alarm History Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
6. Mode Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3
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2WAY VRF SYSTEM
Outdoor Unit Maintenance Remote Controller
1. Overview
[Service Checker Section]
OUTDOOR UNIT MAINTENANCE REMOTE
CONTROLLER (CZ-RTC2) for 2WAY VRF
■ About the outdoor unit maintenance remote controller
The outdoor unit utilizes nonvolatile memory (EEPROM) on
its PCB. This allows EEPROM data to replace the setting
switches that were present on previous PCBs. The outdoor
unit maintenance remote controller is used to set and change
these EEPROM data.
In addition to setting and checking the outdoor unit EEPROM
data, this remote controller can also be used to monitor the
outdoor unit alarm history, monitor the various indoor and
outdoor temperatures, and check the indoor unit connection
status (number of units, operating mode, etc.).
NOTE
Outdoor unit maintenance remote controller does not function as an
ordinary remote controller. It is therefore only used for test runs and during servicing.
3
System diagram
CZ-RTC2
Outdoor unit maintenance
remote controller
Outdoor unit
Special service checker wiring
Inter-unit control wiring
(Servicing No.: CV6231785082)
Outdoor unit
control PCB
Indoor
unit
Indoor
unit
Remote
controller
Remote
controller
Remote controller Ass’y
Operation manual included in package.
●
●
The special service checker wiring is required in order to connect the outdoor unit maintenance remote controller
to the outdoor unit PCB.
Ordinary remote controllers or other controller are still required for the indoor units, even when the outdoor unit
maintenance remote controller is connected.
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Outdoor Unit Maintenance Remote Controller
2. Functions
■ Functions on the ordinary display
(1) Functions: Button operations can be used to perform the following functions.
• Start/stop of all indoor units
• Switching between cooling and heating
• Test run of all indoor units
• Double-speed operation of indoor units (Do not use for actual operation. Doing so may damage the devices.)
(2) Display: The following can be displayed.
• Alarm details display
• No. of indoor/outdoor units
• Unit Nos. of connected indoor/outdoor units
• Indoor/outdoor unit operating status (blinks when an alarm occurs)
• Indoor unit thermostat ON
• Display of individual outdoor unit alarms
• Total operating time of outdoor unit compressors
• Oil level of the outdoor unit oil sensor
• Total outdoor unit power ON time
• Outdoor unit microcomputer version, other information
■ Temperature monitor
• Displays the indoor/outdoor unit sensor temperatures.
3
■ Outdoor unit alarm history monitor
• Displays the outdoor unit alarm history.
■ Mode settings
• Setting mode 1 and setting mode 2 are used to make the outdoor EEPROM setting.
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3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller
■ Functions on the ordinary display
•
Connect the special service checker wiring to the outdoor unit PCB.
The connection is shown in the figure below.
Outdoor unit PCB
RC (3P, BLU)
PCB connector (3P, BLU)
Special service checker wiring
Relay connector (2P, WHT)
Remote controller Ass’y
3
●
●
●
If the communications line in the inter-unit control wiring is connected, it can be left as-is.
In case of an independent outdoor unit (1 maintenance remote controller connected to 1 outdoor unit, automatic
address setting for indoor units not completed), both setting mode 1 and setting mode 2 can be used.
The overall system status for that refrigerant system is displayed.
3-4
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3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller
●
All units start/stop (Fig. 1)
<Operation>
The
(ON/OFF operation) button can be used to
start and stop all the indoor units.
• The LED illuminates if any indoor units is operating.
• The LED blinks if an alarm at any of the operating indoor
units occurs.
LED
●
Cooling/heating change (Fig. 1)
<Operation>
The
(MODE) button can be used to change
between heating and cooling operation.
• The display indicates the operating mode of the indoor
unit with the lowest unit No.
Fig. 1
●
All units test run (Fig. 2)
<Operation>
The
(CHECK) button can be used to start and stop a
test run for all indoor units.
3
• Press and hold for 4 seconds to turn ON.
During the test run “TEST” is displayed.
• The status of test runs performed from the indoor unit
remote controller is not displayed on the outdoor unit
maintenance remote controller.
Fig. 2
●
Double-speed
• Do not use for actual operation.
(Doing so may damage the devices.)
<Operation>
The timer button
can be used to change between
double-speed and normal operation.
• During double-speed operation, the SLEEPING MODE
mark is displayed.
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2WAY VRF SYSTEM
3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller
■ Display (functions)
•
Use the temperature setting
Item code
➀
3
and
buttons to change the item code.
Item
Remarks
Outdoor unit alarm ➁
Alarm code display
No. of connected indoor units
Quantity
Unit Nos. of connected indoor unit
7-segment display
Operating status of indoor unit
7-segment display
Thermostat ON status of indoor unit
7-segment display
No. of connected outdoor units
1–2
Unit Nos. of connected outdoor units
7-segment display
Operating status of outdoor unit compressor
7-segment display
Compressor 1 operating time
0 – 99999999 hrs
Compressor 2 operating time
0 – 99999999 hrs
Compressor 3 operating time
Compressor 1 oil level
0 = Empty 1 = Insufficient 2 = Sufficient
Compressor 2 oil level
0 = Empty 1 = Insufficient 2 = Sufficient
Compressor 3 oil level
Outdoor unit power ON time
0 – 99999999 hrs
Compressor 1 operation count
0 – 65535 times
Compressor 2 operation count
0 – 65535 times
Compressor 3 operation count
Alarm history 1 (most recent)
Alarm history 2
Alarm history 3
Display only. Alarm code and unit No. of unit
where alarm occurred are displayed alternately.
0 = CCU
1 – 2 = Outdoor unit
Alarm history 4
Alarm history 5
Alarm history 6
Alarm history 7
Alarm history 8 (oldest)
Firmware version
Display the version No. × 100.
Program version
Display the version No. × 100.
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2WAY VRF SYSTEM
3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller
(3) XX-YY R.C.
Displays the outdoor unit sub-bus address which is
currently selected.
XX = Outdoor system address on main bus line (1 – 30)
YY = Outdoor unit sub-bus address (1 – 8).
“1” appears when there is only 1 outdoor unit.
Locations where ➀, ➁, and ➂ are displayed
as shown in Fig. 3.
2
1
LED
3
3
Fig. 3
<Sample displays>
01: <No. of connected indoor units>
4 units connected
02: <Unit Nos. 1, 2, 3, and 4 are
connected>
Fig. 4
Fig. 5
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3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller
■ Concerning the 7-segment, 4-digit display remote controller timer display
) and a colon.
The unit Nos. of connected units are indicated by four 7-segment digits (
●
Display of unit Nos. 1 − 20
OFF
OFF
1
3
8
10
OFF
23
26
31
1 ~ 20
ON
ON
OFF
36
33
29
27
21 ~ 40
41 ~ 60
61 ~ 80
is not displayed.
38
Meaning of display colon
39
37
30
ON
OFF
34
32
25
●
20
ON
OFF
28
24
22
3
15
ON
19
17
Display of unit Nos. 21 − 40
21
●
18
14
12
5
Meaning of display colon
16
13
9
7
ON
OFF
11
4
2
●
OFF
6
35
ON
40
1 ~ 20
21 ~ 40
41 ~ 60
61 ~ 80
ON
The meaning of the colon changes in the same way to indicate unit Nos. up to 80.
Sample displays of the connected indoor unit Nos.:
• Display of unit No. 1
• Display of unit Nos. 1 and 2
• Display of unit Nos. 1, 2, and 3
• Display of unit Nos. 1, 2, 3, and 4
NOTE
The change of the colon display (between unit Nos. 1-20 to unit Nos. 21-40) occurs automatically
every 10 seconds. (However the display does not change if there are no higher-number units connected.)
To change the display to the higher-number units before 10 seconds have passed, press the
(FLAP)
button.
(A)
(B)
■ The total compressor operating time is displayed
(in 1-hour units) using 8 digits.
• When the first 4 digits are displayed, the top
dot of the colon is illuminated. (Figure (A))
• When the last 4 digits are displayed, the colon
dot is OFF. (Figure (B))
• The display of the first 4 digits and last 4 digits
changes automatically after 10 seconds. The display
can also be changed by pressing the
button.
(FLAP)
10: <Compressor’s total operating time>
(A) and (B) are displayed alternately.
(The example here (0000, 0062) indicates 62 hours.)
NOTE
With the outdoor unit maintenance remote controller (when connected to the outdoor unit), the unit remote
controller check functions will not operate.
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2WAY VRF SYSTEM
Outdoor Unit Maintenance Remote Controller
4. Monitoring Operations
Display the indoor unit and outdoor unit sensor
temperatures.
<Operating procedure>
➀ Press and hold the
(CHECK) button and
buttons simultaneously for 4 seconds or longer to
engage temperature monitor mode.
During temperature monitoring,
is illuminates.
(The display and operations are the same as
for monitor mode using the indoor unit remote
controller.)
➁ Press the
4
3
button and select the indoor unit
to monitor.
➂ Press the temperature setting
and
buttons and select the item code of the temperature
to monitor.
1
2
The unit No. of the selected indoor unit, and the
temperature data, are displayed.
➃ To end monitoring, press the
(CHECK) button.
The display returns to the normal display.
NOTE
3
The display does not blink.
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Outdoor Unit Maintenance Remote Controller
4. Monitoring Operations
■ Display of unit No. 1 (main unit)
DN
Description
Remarks
Intake temp.
°F
E1
°F
E2
°F
E3
°F
Discharge temp.
°F
Discharge temp. setting
°F
Indoor unit electronic control valve position
STEP
Discharge temp. 1
°F
Discharge temp. 2
°F
High-pressure sensor temp.
°F
Heat exchanger gas 1
°F
Heat exchanger liquid 1
°F
Heat exchanger gas 2
°F
Heat exchanger liquid 2
°F
Outdoor air temp.
°F
Indoor unit
Not used
3
Inverter primary current
A
CT2
A
MOV1 pulse
STEP
MOV2 pulse
STEP
Discharge temp. 3
°F
CT3
A
MOV3 pulse
STEP
MOV4 pulse
STEP
Heat exchanger gas 3
°F
Heat exchanger liquid 3
°F
Low-pressure sensor temp.
°F
Suction temp.
°F
Oil 1
°F
Oil 2
°F
Oil 3
°F
Actual operating frequency
Hz
Outdoor unit
NOTE
0A and subsequent items are outdoor unit data. 0A – 22 are for unit No. 1.
2A – 42 are for unit No. 2.
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5. Outdoor Unit Alarm History Monitor
2WAY VRF SYSTEM
Outdoor Unit Maintenance Remote Controller
• Displays outdoor unit alarms only.
• Check the indoor unit alarm histories separately using the
indoor unit remote controllers or other control device.
<Operating procedure>
➀ Press and hold the
(CHECK) button and
button simultaneously for 4 seconds or longer to engage
outdoor unit alarm history mode.
During temperature monitoring,
illuminates.
The display and operations are the same as for the
alarm history monitor performed from the indoor unit
remote controller. However the “unit No.” display shows
the outdoor unit address.
➁ Press the
button and select the outdoor unit for
which to monitor the alarm history.
3
5
1
4
2
➂ Press the temperature setting
and
buttons and select the item code for the alarm history.
The select outdoor unit address, the item code, and the
alarm history (alarm data) are displayed.
3
The outdoor unit address is displayed as R.C. XX-YY.
System XX = Outdoor unit system address
R.C. XX = Outdoor unit system address
YY = Outdoor unit sub-bus address
Item codes 01-08 are displayed. 01 indicates the most
recent alarm.
The alarm history displays the alarm code. (If no alarm
are present, then -- -- is displayed.)
➃ To clear the alarm history, press the
button. (The
outdoor unit alarm history will be cleared.)
➄ To exit, press the
(CHECK) button. The display
returns to the normal display.
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Outdoor Unit Maintenance Remote Controller
6. Mode Settings
■ Setting mode 1
<Operating procedure>
A
Display of first 4 digits
➀ Press and hold the
(CHECK) button and
(VENTILATION) button simultaneously for 4
seconds or longer.
➁ Press the temperature setting
and
buttons to change the item code. The item codes
and setting data are shown in the table of “List of
Item Codes” on the next page.
➂ Press the timer time
and
buttons to
5
change the setting data.
2
To confirm the changed setting data, press the
button.
(At this time, all displays stop blinking and remain
lit.)
1
➃ During this mode, “
3
B
” is displayed, blinking.
The outdoor unit address display section displays
“ALL,” the item code and number (DN value in the
table), and the setting data (8 digits).
(The setting data is displayed in 8 digits. The
display changes between the first 4 digits (Fig.
and the last 4 digits (Fig. B ).
A
3
Display of last 4 digits
)
When the first 4 digits are displayed, the top dot of
the colon is illuminated.)
➄ To exit the setting mode, press the
5
(CHECK)
button.
2
1
3
A and B are displayed alternately.
(Example shows display of 0000 0001.)
DN
Parameter
Snowfall sensor usage
Outdoor unit fan Quiet
mode
Energy saving mode
Energy saving operation
plug
Demand 1 current
Demand 2 current
Description
0 = Sensor input not present. Control is performed.
1 = Sensor input present. Control is performed.
2 = Sensor input not present. Control is not performed.
3 = Sensor input present. Control is not performed.
0 = Disabled
1 = Quiet mode 1
2 = Quiet mode 2
3 = Quiet mode 3
4 = Quiet mode 4
0 = None
1 = Discharge temp. control only (Mode 3)
2 = Demand only (Mode 2)
3 = Discharge temp. control + Demand (Mode 1)
0 = Independent
1 = All indoor units linked
0 = 0% 1 = 40 … 4 = 70 7 = 100 8 = 120
9 = 140 10 = 160 11 = 200 12 = –1 (no limit)
0 = 0% 1 = 40 … 4 = 70 7 = 100 8 = 120
9 = 140 10 = 160 11 = 200 12 = –1 (no limit)
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Outdoor Unit Maintenance Remote Controller
6. Mode Settings
■ Setting mode 2
<Operating procedure>
➀ Press and hold the
(CHECK) button,
simultaneously for 4 seconds or longer.
button, and
button
➁ Press the temperature setting
and
buttons to change the item
code. The item codes and setting data are shown in the table below.
➂ Press the timer time
and
buttons to change the setting data.
To confirm the changed setting data, press the
button.
5
(At this time, all displays stop blinking and remain lit.)
2
➃ During this mode, “
” is displayed, blinking. The display shows the set
outdoor unit address “System XX-YY” (System XX = System address, YY =
Address at outdoor unit sub-bus), item code number (DN value in the table
below), and the setting data (8 digits).
1
(The setting data is displayed in 8 digits. The display changes between the first 4 digits (Fig.
digits (Fig. B ). When the first 4 digits are displayed, the top point of the colon is lit.)
➄ To exit setting mode, press the
3
Fig. 7
A
) and the last 4
(CHECK) button. Returns to the normal display mode.
A Display of first 4 digits
B Display of last 4 digits
3
5
2
1
3
<Refrigerant type> A and B are displayed alternately. (Example
shows 0000 0410 (R410A).)
List of Item Codes
DN
81
Parameter
Outdoor unit capacity
Description
0 = Disabled 210 = 72 Type 280 = 96 Type
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– MEMO –
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2WAY VRF SYSTEM
Remote Controller Functions
Contents
4. REMOTE CONTROLLER FUNCTIONS
1. Simple Settings Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
2. Detailed Settings Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
3. Remote Controller Servicing Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
4
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2WAY VRF SYSTEM
Remote Controller Functions
1. Simple Settings Function
• This allows the filter lifetime, operating mode
[Remote Controller Functions Section]
priority change, central control address, and other
settings to be made for an individual or groupcontrol indoor unit to which the remote controller
used for simple settings is connected.
2
When simple settings mode is engaged, operation
stops at the individual or group-control indoor unit
to which the remote controller for simple settings is
connected.
<Procedure>
➀
Press and hold the
and
buttons
simultaneously for 4 seconds or longer.
➁
“
,” unit No. “
” (or “
” in the case of
group control), item code “
,” and settings data
“
” are displayed blinking on the remote
controller LCD display (Fig. 1). At this time, the
indoor unit fan (or all indoor unit fans in the case of
group control) begins operating.
➂
3
7
4
1
If group control is in effect, press the
button and select the address (unit No.) of the
indoor unit to set. At this time, the fan at the indoor
unit begins operating.
6
5
#:24#
Fig. 1
* If unit No. “
” is displayed, the same setting
will be made for all indoor units.
4
➃
Press the temperature setting
/
buttons to select the item code to change.
➄
Press the timer time
desired setting data.
/
buttons to select the
* For item codes and setting data, refer to the
following page.
➅
Press the
button. (The display stops blinking
and remains lit, and setting is completed.)
➆
Press the
button to return to normal remote
controller display.
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2WAY VRF SYSTEM
Remote Controller Functions
1. Simple Settings Function
List of Simple Setting Items
Item code
Item
Filter sign ON time
(fitlter life time)
Degree of filter fouling
No.
0000
0001
0002
0003
0004
0005
0000
0001
0001
0002
0003
Setting data
Description
Not displayed
150 hours
2,500 hours
5,000 hours
10,000 hours
Use the filter clogging sensor.
Standard (setting at time of shipping)
Highly fouled
(Filter sign ON time is reduced to one-half the set time.)
Central control address 1
Central control address 2
Central control address 3
Central control
address
0000
0001
0002
0004
0005
0006
0000
0001
0002
0003
0004
0005
0006
0000
0001
Central control address 64
No central control address set (setting at time of shipping)
Normal (setting at time of shipping)
Priority
Compressor ON
Compressor OFF
MED 1 min., LO 3 min.
LO
MED
LO
LO
LO
MED 1 min., LO 3 min.
MED
MED
MED
LO
MED
No shift
Shifts intake temperature 2°F down.
Shifts intake temperature 4°F down.
Shifts intake temperature 6°F down.
Shifts intake temperature 8°F down.
Shifts intake temperature 10°F down.
Shifts intake temperature 12°F down.
No heater
Heater installed
Humidifying when
heater thermostat is
OFF
0000
No (setting at time of shipping)
0001
Yes
Permit/prohibit
automatic
heating/cooling
0000
Permit
0001
Prohibit
0000
0001
Normal
Cool only (Set “1” for item code OD.)
Operating mode
priority change
Fan speed when
heating thermostat is
OFF
Heating intake
temperature shift
Electric heater
installation
Cool-only
0064
0099
0000
0001
4
NOTE
• In order to avoid water leakage and damage to the fan, do not set for humidifying when the thermostat is OFF unless a
vaporizing humidifier is used.
• Consider the device purpose and type when changing the settings. Incorrect settings may result in malfunction.
• Do not change any setting data that does not appear in this list.
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2WAY VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
• This allows the system address, indoor unit
address, and other settings to be made for the
individual or group-control indoor unit to which
the remote controller used for detailed settings is
connected.
When detailed settings mode is engaged,
operation stops at the individual or group-control
indoor unit where the remote controller used for
detailed settings is connected. Simple settings
items can also be set at this time.
2
<Procedure>
➀
Press and hold the
and
buttons
,
simultaneously for 4 seconds or longer.
➁
“
,” unit No. “
” (or “
” in the case
of group control), item code “
,” and settings
data “
” are displayed blinking on the
remote controller LCD display (Fig. 2).
3
7
4
At this time, the indoor unit fan (or all indoor unit
fans in the case of group control) begins operating.
➂
4
1
If group control is in effect, press the
button and select the address (unit No.) of the
indoor unit to set. At this time, the fan at the indoor
unit begins operating.
➃
Press the temperature setting
/
buttons to select the item code to change.
➄
Press the timer time
desired setting data.
/
6
1
5
CZ-RTC2
Fig. 2
buttons to select the
* For item codes and setting data, refer to the
following page.
➅
Press the
button. (The display stops blinking
and remains lit, and setting is completed.)
➆
Press the
button to return to normal remote
controller display.
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2WAY VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
List of Detailed Setting Items
Item code
Item
Type
Indoor unit
capacity
Setting data
No.
Description
No.
Description
0000
1-Way Cassette (D1)
0001
0006
High Static Pressure
Ducted (E1)
0007
Ceiling (T1)
0010
Floor Standing (P1)
0011
Concealed Floor
Standing (R1)
No.
Low Silhouette Ducted (F1)
4-Way Cassette (60x60)
0005
Slim Low Static Ducted (M1)
(U1, Y1)
0008
0001
22 (Type 7)
0003
28 (Type 9)
0005
0007
45 (Type 15)
0009
56 (Type 18, 19)
0011
0015
112 (Type 36)
0017
80 (Type 24)
0012 (Except S-24MP1U6,
S-24MR1U6)
0018
Description
Wall mounted (K1)
36 (Type 12)
71 (Type 24) For
S-24MP1U6 and S-24MR1U6
140 (Type 48)
160 (Type 54)
0001 Unit No. 1
0002 Unit No. 2
System
address
0003 Unit No. 3
0030 Unit No. 30
0099 Not set
0001 Unit No. 1
0002 Unit No. 2
Indoor unit
address
0003 Unit No. 3
4
0064 Unit No. 64
0099 Not set
0000 Individual (1:1 = Indoor unit with no group wiring)
Group control 0001 Main unit (One of the group-control indoor units)
address
0002 Sub unit (All group-control indoor units except for main unit)
0099 Not set
–010 Shifts intake temperature by –20°F.
–009 Shifts intake temperature by –18°F.
Cooling
–001 Shifts intake temperature by –2°F.
intake
0000 No intake temperature shift
temperature
0001 Shifts intake temperature by +2°F.
shift
0009 Shifts intake temperature by +18°F.
0010 Shifts intake temperature by +20°F.
Automatic
stop time
after
operation
start
*Can be set
in 5-minute
units.
0000 Function disabled
0001 Stops automatically 5 minutes after operation starts.
0002 Stops automatically 10 minutes after operation starts.
0123 Stops automatically 615 minutes after operation starts.
0124 Stops automatically 620 minutes after operation starts.
0125 Stops automatically 625 minutes after operation starts.
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2WAY VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
Item code
(1B)
Item
Forced thermostat ON time
Cooling discharge
temperature shift
Heating discharge
temperature shift
Cooling
Temperature shift for
cooling/heating change in
auto heat/cool mode
(Upper limit)
Heating
(Lower limit)
(Upper limit)
4
Change to remote
control temperature
setting range
Drying
(Lower limit)
(Upper limit)
Auto heat/cool
(Lower limit)
(Upper limit)
(Lower limit)
Humidifier operation
Filter (CN70) input
switching
Indoor unit electronic
control valve
T10 terminal switching
Setting data
Description
No.
0000
0001
–010
–009
–008
5 minutes
4 minutes
–20°F
–18°F
–16°F
0010
–010
–009
–008
20°F
–20°F
–18°F
–16°F
0010
0001
0002
0003
20°F
±2°F
±4°F
±6°F
0007
0018
0019
±14°F
64°F (Lower limit at shipment)
66°F
0029
0030
0016
0017
84°F
86°F (Upper limit at shipment)
60°F (Lower limit at shipment)
62°F
0029
0030
0018
0019
84°F
86°F (Upper limit at shipment)
64°F (Lower limit at shipment)
66°F
0029
0030
0017
0018
84°F
86°F (Upper limit at shipment)
62°F (Lower limit at shipment)
64°F
0026
0027
0000
0001
0000
0001
78°F
80°F (Upper limit at shipment)
Normal
Ignore heat exchanger temperature conditions.
Filter input (differential pressure switch input)
Alarm input (for trouble input about air cleaner or similar device)
Humidifier input (Operates linked with drain pump when humidifier is
ON.)
Present (Setting at shipment)
None
Normal (Used as optional relay PCB or JEMA standard HA terminal.)
Used for OFF reminder
Fire prevention input
0002
0000
0002
0000
0001
0002
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2WAY VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
Item code
Item
Setting data
Description
No.
0000
0001
No forced operation
Forced operation for 1 minute
0060
0000
0001
0000
0001
Continuous operation
None
Ventilation fan operated by remote controller.
Not used. (Body sensor is used.)
Remote control sensor is used.
0000
Normal (displayed)
0001
Not displayed
0000
None
0001
Only stop time setting is enabled.
Discharge temperature
control
0000
Discharge temperature control OFF
0001
Discharge temperature control ON
Heat exchanger
temperature for cold air
discharge
(Heat exchanger control
point for control to
prevent cold air)
0013
0014
Control temperature 55°F
Control temperature 57°F
0025
0026
0000
0001
0000
0001
0002
Control temperature 77°F
Control temperature 78°F
Output linked with fan. (ON when indoor unit fan is operating.)
Fan mode operation output
No delayed start
1 sec. delayed start
2 sec. delayed start
0058
0059
0060
0000
0001
58 sec. delayed start
59 sec. delayed start
60 sec. delayed start
Humidifier output OFF. Drain pump stopped.
Humidifier output ON. Drain pump operates.
Humidifier output ON. Drain pump operates for 1 minute when total humidifier
operating time reaches 60 minutes.
Humidifier output ON. Drain pump stopped.
Standard setting
Draft reduction mode (Flap lower-limit position is shifted upwards.)
Smudging reduction mode (Flap swing upper-limit position is shifted downwards.)
Normal mode
Draft reduction mode (Flap swing lower-limit position is upwards.)
Automatic drain pump
operation
Ventilation fan operation
Wired remote controller
sensor
“Operation change
control in progress”
display
OFF reminder function
for when weekly timer is
used
Fan output switching
4
Drain pump delayed
start time
Humidifier setting
Flap operation mode
Flap swing mode
0002
0003
0000
0001
0000
0001
0002
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2WAY VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
Item code
Item
No.
0000
0001
Fan tap setting
(Fan tap change in order
to prevent drop in air
discharge caused by
filter installation)
0003
DC fan tap operating
mode
Standard
High ceiling use
For low
static-pressure filter
High ceiling use
For low
static-pressure filter
0000
0001
0002
For air-blocking
material
For air-blocking
material
No humidifier output
1 sec.
2 sec.
0058
0059
0060
0000
58 sec.
59 sec.
Continuously ON
Function disabled
Timer function change
prohibit
0001
0000
0001
Function enabled
Function disabled
Function enabled
Smudging control
0000
No smudging control
0006
Humidifier ON time
(ON time per 60
seconds)
Repeat timer switching
4
Setting data
Description
Purpose
Standard (setting at shipment)
High ceiling setting 1 (with standard panel)
Ultra long-life filter, oil guard panel, ammonia deodorizing
filter, optical regenerative deodorizing filter
High ceiling setting 2 (with standard panel)
(Antibacterial) high-performance filter (90%)
(Antibacterial) high-performance filter (65%)
Air-cleaning unit, air-cleaning unit + optical regenerative
deodorizing filter, deodorant (activated charcoal) filter
For 3-way discharge, when discharge duct is connected
For 2-way discharge
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2WAY VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
Simple setting items
Item code
Item
Description
01
Filter sign ON time setting
(filter lifetime)
Changes the indoor unit filter lifetime when a high-performance filter or other
optional product is installed.
02
Degree of filter fouling
Reduces the filter sign ON time to 1/2 of the standard time (setting at the time of
shipping) for cases when filter fouling is more severe than normal.
Filter sign ON times for each model
Filter sign ON time
g
Hig
fou h
lin
g
dar
d
Sta
n
Hig
fou h
lin
dar
d
High
High
performance performance
Pressure
65
90
differential
switch
Sta
n
Hig
fou h
ling
Hig
fou h
ling
dar
d
Sta
n
Hig
fou h
ling
Sta
n
dar
d
Model
Super
long-life
dar
d
Model
data
Long-life
Sta
n
Standard
0000 1-Way Cassette (D1)
×
75
2500
1250
×
×
×
×
×
×
×
0001 4-Way Cassette (U1, Y1)
×
×
2500
1250
5000
2500
2500
1250
×
×
×
0005
Low Silhouette Ducted (F1)
Slim Low Static Ducted (M1)
×
×
×
1250
5000
2500
2500
1250
5000
2500
×
0006
High Static Pressure
Ducted (E1)
×
×
×
1250
×
×
2500
1250
5000
2500
×
×
×
2500
1250
×
×
2500
1250
×
×
×
0008 Wall Mounted (K1)
150
75
×
×
×
×
×
×
×
×
×
0010 Floor Standing (P1)
150
75
×
×
×
×
×
×
×
×
×
0011 Concealed Floor Standing (R1)
150
75
×
×
×
×
×
×
×
×
×
0007 Ceiling (T1)
4
Unit: hour
NOTE
• × indicates that there is no corresponding filter.
• 150 indicates the filter sign ON time that is set at shipment.
• High fouling: Set when
is selected for the degree of filter fouling (item code
).
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2WAY VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
Item code
Item
03
Central control address
04
Operating mode priority change
Description
Set when using a central control device.
Used when setting the central control address manually from the
remote controller.
Note (1)
NOTE
(1) Explanation of operation mode priority change
Enabled only in 2WAY VRF System heat-pump models.
<Function>
With indoor units that are installed in combination with an outdoor unit model where either heating or cooling
operation can be selected, the operating mode of the indoor unit that starts first takes priority. The first indoor unit
to operate can select any operating mode. When any mode other than fan mode is selected, then the operating
modes that cannot be selected are not displayed on all remote controllers that are subsequently operated.
“Operation change control in progress” is displayed, indicating that there are restrictions on the operating
modes that can be selected.
• Controlling the operating mode from a specific remote controller
- When there are multiple remote controllers in the same refrigerant system, it is possible to set one remote
controller as the priority remote controller (the remote controller which is given priority for selecting the
operating mode). (If 2 or more remote controllers are set as priority remote controllers, an alarm will occur at
the remote controllers, and operation will not be possible.)
4
- When the priority remote controller is set to the operating mode for control, then all other remote controllers can
select only the permitted operating mode, regardless of whether the priority remote controller is operating or
stopped.
- When a controlled remote controller is operated, “Operation change control in progress” is displayed.
Set mode at priority remote controller
Cooling or dry
Heating
Fan
Modes that can be selected at other remote controllers
Cooling, dry, fan
Heating, fan
Whichever mode (heating/cooling) is selected first
NOTE
There are other methods to avoid control in which the mode selected first takes priority.
Methods of remotely controlling the operating mode
(1) Use the central functions of a central control device.
(2) Use a remote control relay PCB at the outdoor unit.
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2WAY VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
When the operating mode at the priority remote controller is changed, the operating modes of other remote
controllers change as shown below.
Mode change at priority remote controller Operating modes at other remote controllers
Current mode
New mode
Current mode
New mode
Cooling or dry
Heating
Heating
Cooling
Cooling
Dry
Heating
Dry
Cooling or dry
Fan
Heating
Fan
Cooling or dry
Heating
Fan
Fan (not changed)
Heating
Cooling
Fan
Fan (not changed)
Cooling
Cooling (not changed)
Dry
Dry (not changed)
Heating
Cooling
Fan
Fan (not changed)
Cooling
Cooling (not changed)
Dry
Dry (not changed)
Fan
Fan (not changed)
Heating
Heating (not changed)
Fan
Fan (not changed)
Item code
Item
Description
05
Fan speed setting when
heating thermostat is OFF
Changes the fan speed setting when the heating thermostat is OFF.
06
Heating intake temperature
shift
Shifts the intake temperature during heating.
Can be set when the body thermostat is used.
07
Electric heater installation
Set when cost distribution is performed using an AMY central control system
or similar system, and when an optional electric heater is installed.
(This is unrelated to control of the electric heater.)
08
Humidifying when heater
thermostat is OFF
Normally humidifying does not occur when the thermostat is OFF during
heating operation. However, this setting can be changed in order to increase
the amount of humidifying.
Caution: In order to avoid water leakage and damage to the fan, do not use
this setting unless a vaporizing humidifier is used.
0D
Permit/prohibit automatic
heating/cooling
This setting can be used to prevent the automatic heating/cooling display on
the remote control if the unit configuration permits automatic heating/cooling
operation.
0F
Cooling-only
This setting allows a heat pump indoor unit to be operated as a cooling-only
unit.
4
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2WAY VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
Item code
Item
Description
10
Unit type
11
Indoor unit capacity
12
System (outdoor unit)
address
13
Indoor unit address
14
Group address
17
Cooling intake temperature
shift
Shifts the intake temperature during cooling and dry operation.
(Enabled only when the body thermostat is used.)
Increase this value when it is difficult to turn the thermostat ON.
18
Automatic stop time after
operation start
The time at which an indoor unit is automatically stopped after operation starts
can be set in increments of 5 minutes.
1E
Temperature shift for
cooling/heating change in
“auto heat/cool” mode
“Auto heat/cool” selects the operating mode automatically based on the
difference between the room temperature and the temperature set on the
remote controller. This setting establishes a shift temperature for the heating/
cooling temperature setting relative to the remote controller temperature
setting.
Set when the indoor unit EEPROM memory is replaced during servicing.
These are not set at the time of shipping from the factory.
These must be set after installation if automatic address setting is not
performed.
Cooling temperature setting
Shift temperature
(+)
4
Remote controller temperature setting
Shift temperature
(–)
Heating temperature setting
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2WAY VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
Item code
Item
1F (Upper limit)
20 (Lower limit)
21 (Upper limit)
22 (Lower limit)
23 (Upper limit)
24 (Lower limit)
Description
Cooling
Change to the remote
control temperature
setting range
25 (Upper limit)
26 (Lower limit)
Heating
Drying
This setting changes the temperature range (upper limit and lower limit)
which is set from the remote controller or central control device.
The set upper limit must be greater than or equal to the lower limit. If the
temperature setting is to be a single point, set the upper limit and lower
limit to the same temperature.
Auto
heat/cool
29
Humidifier operation which ignores
the heat exchanger temperature
During heating operation, the humidifier operates when the heat
exchanger temperature is suitable for humidifying. This setting is
used to ignore this condition for humidifier operation and operate the
humidifier more.
2A
Filter input switching
This setting switches the filter input according to the purpose of use.
2C
Indoor unit electronic control valve
This setting indicates whether or not an indoor unit electronic control
valve is present.
At the time of shipping, this setting is set according to the conditions of
the indoor unit.
2E
T10 terminal input switching
Ordinarily, the T10 terminal is used as the HA terminal at the time of
shipping. However, this setting is used when the T10 terminal is used
for OFF reminder or for fire prevention input.
Ventilation fan operation from
remote controller
It is possible to install a total heat exchanger and ventilation fan in
the system, which can be started and stopped by the wired remote
controller. The ventilation fan can operate linked with the start and
stop of the indoor unit, or can be operated even when the indoor
unit is stopped.
Use a ventilation fan that can accept the no-voltage A contact as
the external input signal.
In the case of group control, the fans are operated together. They
cannot be operated individually.
Switching to remote controller
sensor
This setting is used to switch from the body sensor to the remote
controller sensor.
Check that “remote controller sensor” is displayed.
Do not use this setting with models that do not include a remote
controller sensor.
Do not use this setting if both the body sensor and remote sensor
are used.
ON/OFF of “Operation change
control in progress” display
In a MULTI system with multiple remote controllers, switching
between heating and cooling is restricted, and “Operation change
control in progress” is displayed.
This setting is used to prevent this display from appearing.
Refer to the item concerned with operating mode priorities.
OFF reminder function for weekly
timer
This setting switches the operation when the weekly timer is
connected to the remote controller.
This can be used to prevent cases in which the unit is accidentally
left ON. There is no change when this setting is ON, however it is
necessary to set the weekly timer ON time.
31
32
34
35
4
(Continued)
4 - 13
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2WAY VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
(Continued from previous page)
Item code
Item
Description
3C
Heat exchanger temperature for
cold air discharge
The heat exchanger temperature control point for prevention of cold air
discharge during heating operation can be changed.
3d
Fan output switching
The indoor unit PCB optional output for the fan can be switched
according to the purpose of use.
3E
Drain pump delayed start time
The drain pump starts after the set time delay after cooling operation
stops.
40
Humidifier drain pump setting
This specifies the humidifier and drain pump setting.
45
DC flap operation mode
Changes flap operation to draft reduction mode.
46
DC flap swing mode
Selects the swing operation mode for the flap.
5d
DC fan tap setting
Sets the DC fan tap according to the purpose of use.
Change the settings data at the same time.
5E
Humidifier ON time
Sets the humidifier output ON time for when the humidifier is operating.
ON/OFF control is performed during humidifier operation.
This setting therefore sets the ON time per 60-second interval.
5F
This setting enables a function that stops operation when the amount
Stop at time set for OFF timer after
of time set for the OFF timer has passed after remote controller
operation starts
operation was started.
60
Timer function change prohibit
This function prohibits changes from being made to the remote
controller time setting.
62
Smudging control
Smudging control is disabled when 0000 is set.
4
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2WAY VRF SYSTEM
Remote Controller Functions
3. Remote Controller Servicing Functions
• The remote controller includes a number of servicing functions. Use these as needed for test runs and
inspections.
List of Servicing Functions
Functions
Test run
Description
Operation with
forced thermostat
ON
Sensor
temperature
display
Temperature
display from each
sensor
Servicing check
display
Alarm history
display
Button operation
Press and hold the
Reset operation
button
for 4 seconds or longer.
Press and hold the
and
longer.
and
buttons for 4 seconds or
longer.
Simple settings
Detailed settings
Automatic
address
Address change
Change of indoor
unit address
Current operation is
maintained.
buttons for 4 seconds or
Press and hold the
Filter life time,
operating mode
priority, central
control address,
and other settings
System address,
indoor unit address,
central control
address, and other
settings
Automatic address
setting based on
command from
the wired remote
controller
Unit status
Press the
button.
Press and hold the
and
buttons for 4 seconds or
longer.
Press and hold the
and
When settings are made
from a remote controller,
the indoor unit where that
remote controller is
connected stops.
,
buttons for 4 seconds
or longer.
Press and hold the
and
buttons Automatic reset
the timer operation
for 4 seconds or longer.
Press and hold the
and
Entire system stops.
4
Press the
the timer operation
buttons
button.
for 4 seconds or longer.
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2WAY VRF SYSTEM
Remote Controller Functions
3. Remote Controller Servicing Functions
Test Run Function
Operates the unit with the thermostat forced ON.
<Procedure>
➀
Press and hold the
longer.
➁
“Test” appears on the remote controller LCD
display (Fig. 3).
➂
Start operation.
➃
Press the
button to return to normal remote
controller display.
2
button for 4 seconds or
3
1 4
CZ-RTC2
Fig. 3
4
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2WAY VRF SYSTEM
Remote Controller Functions
3. Remote Controller Servicing Functions
■ Sensor Temperature Display Function
(displayed regardless of whether unit is
operating or stopped)
2
The procedure below displays the sensor
temperatures from the remote controller, indoor unit,
and outdoor unit on the remote controller.
<Procedure>
➀
Press and hold the
and
buttons
simultaneously for 4 seconds or longer.
➁
The unit No. “X-X” (main unit No.), item code “XX”
(sensor address), and servicing monitor “
”
(sensor temperature) are displayed on the remote
controller LCD display. (See Fig. 4 at right.)
➂
➃
➄
3
Press the temperature setting
/
buttons and select the item code to the address of
the sensor to monitor.
(For the relationships between the sensor
addresses and sensor types, refer to the table of
temperature sensors and addresses on the next
page.)
5
1
4
CZ-RTC2
* Display shows a discharge temperature of 00XX at
unit No. 1-1.
Fig. 4
NOTE
If group control is in effect, press the
button to select the unit to monitor.
Press the temperature setting buttons to select the
item code to change.
4
The temperature display appears as “- - - -” for units
that are not connected.
* If monitor mode is engaged while normal operation
is in progress, only the parts of the LCD display
shown in the figure will change. Other parts continue
to display the same information as during normal
operation.
Press the
button to return to normal remote
controller display.
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3. Remote Controller Servicing Functions
Indoor unit sensors
02
Intake temp.
03
E1
04
E2
05
E3
06
Discharge temp.
07
Discharge temp. setting
08
Position of indoor unit electronic
control valve
Unit No.1
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
20
21
22
Unit No.2
2A
2B
2C
2D
2E
2F
30
31
32
33
34
35
36
37
38
39
3A
3B
3C
3D
3E
3F
40
41
42
2WAY VRF SYSTEM
Remote Controller Functions
Outdoor unit sensors
Unit No.3
4A
Discharge temp. 1
4B
Discharge temp. 2
4C
High-pressure sensor temp.
4D
Heat exchanger gas 1
4E
Heat exchanger liquid 1
4F
Heat exchanger gas 2
50
Heat exchanger liquid 2
51
Outdoor air temp.
52
—
53
For inspection
54
CT2
55
For inspection
56
For inspection
57
Discharge temp. 3
58
CT3
59
For inspection
5A
For inspection
5B
Heat exchanger gas 3
5C
Heat exchanger liquid 3
5D
Low-pressure sensor temp.
5E
Suction temp.
5F
Oil 1
60
Oil 2
61
Oil 3
62
For inspection
4
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2WAY VRF SYSTEM
Trouble Diagnosis
Contents
5. TROUBLE DIAGNOSIS
1. Contents of Remote Controller Switch Alarm Display . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
2. Outdoor Unit Control Panel LED Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
3. Remote Controller Servicing Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
4. 2WAY VRF Alarm Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
5. Blinking Inspection Display on the Remote Controller . . . . . . . . . . . . . . . . . . . . . . . . 5-27
6. Inspection of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28
7. Test Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-29
8. Thermister Characteristic Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-30
5
5-1
SM830199-00_2WAY VRF SYS US-lett1 1
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Wired
remote
control
display
Serial
communication
errors
Mis-setting
Remote controller is detecting Error in receiving serial communication signal. (Signal from
error signal from indoor unit.
main indoor unit in case of group control) Outdoor system
address, indoor unit address, or indoor unit address
independent/main/sub unit setting has not been made.
(Auto address is not completed.)
Error in transmitting serial communication signal.
Indoor unit is detecting error signal from remote controller and system controller.
<E01>
OFF:
Wireless
remote controller
receiver display
Operation
Possible cause of malfunction
Blinking:
Standby
for heating
ON:
Timer
1. Contents of Remote Controller Switch Alarm Display
2WAY VRF SYSTEM
Trouble Diagnosis
Operating lamp
blinking
<E02>
<<E03>>
Indoor unit is detecting error
signal from outdoor unit.
• Error in receiving serial communication signal.
• When turning on the power supply, the number of
connected indoor units does not correspond to the number
set. (Except R.C. address is “0.”)
E04
• Group wiring failure of indoor units in the refrigerant system
(occurring when remote controller is operated immediately
after automatic address setting)
Outdoor unit is detecting error
• Error in receiving serial communication signal.
signal from indoor unit.
• There is an indoor unit which does not send signals when
<E06>
the power is ON.
Improper setting
• Indoor unit address setting is duplicated.
E08
• Duplicated remote controller “main” setting.
<<E09>>
Improper setting
Automatic address setting start is prohibited.
AP pin was short-circuited at time when automatic address
E12
setting was started.
Indoor unit communication
Error of main indoor unit in receiving serial communication
E18
error of group control wiring.
signal from sub indoor units.
E15
During auto. address setting, Number of connected indoor units is less than the number set.
number of connected units
Number of connected indoor units is more than the number set.
E16
does not correspond to number No indoor unit is connected during auto. address setting.
E20
set.
Main outdoor unit is detecting error signal from sub outdoor unit.
E24
Duplicated outdoor unit address.
E25
Mismatch in “No. of outdoor units” setting.
E26
Error of sub outdoor unit in receiving serial communication
E29
signal from main outdoor unit.
Improper setting
Connected indoor unit is not a multi unit.
L02
Duplication of main indoor unit address setting in group control. <L03>
Duplicated indoor unit priority (priority indoor unit).
L05
Duplicated indoor unit priority (non-priority indoor unit) and
L06
outdoor unit.
Group control wiring is connected to individual control indoor unit.
L07
Indoor unit address is not set.
L08
Capacity code of indoor unit is not set.
<<L09>>
Mismatch of outdoor unit type.
L17
Duplication of outdoor R.C. address setting.
L04
Capacity code of outdoor unit is not set.
L10
5
4-way valve operation failure
Thermistor
fault
Indoor unit
Thermistor fault Outdoor unit
Heating ready lamp
blinking
Operating lamp
blinking
Heating ready lamp
blinking
Operating and heating
ready lamps blinking
simultaneously
Operating and heating
ready lamps blinking
simultaneously
L18
Indoor coil temp. sensor (E1)
Indoor coil temp. sensor (E3)
Indoor suction air (room) temp. sensor
Indoor discharge air temp. sensor
Compressor 1 (INV) discharge temp. sensor
Compressor 2 (constant speed) discharge temp. sensor
Outdoor air temp. sensor
Heat exchanger 1 liquid temp. sensor
Heat exchanger 1 gas temp. sensor
<<F01>>
<<F03>>
<<F10>>
<<F11>>
F04
F05
F08
F07
F06
Operating and
timer lamps blinking
alternately
Operating and timer
lamps blinking
altemately
Continued
5-2
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Blinking:
Wired
remote
control
display
Thermistor fault Outdoor unit
Compressor intake temp. sensor (suction temp)
High-pressure sensor
Low-pressure sensor
Heat exchanger 2 liquid temp. sensor
Heat exchanger 2 gas temp. sensor
Ceiling panel connection failure
Protective
Indoor unit
device
Thermal protector in indoor unit fan motor is activated.
Float switch is activated.
Fan inverter protection function activated.
Outdoor unit
Oxygen (O2) gas sensor activated.
Compressor 1 (INV) discharge temp. trouble
High-pressure switch or Overload Protector (OLR)
Reverse phase (missing phase) detected.
DCCT, ACCT overcurrent (compressor less than 80 Hz)
Compressor 2 (constant speed) discharge temp. trouble
Outdoor unit fan trouble
DCCT, ACCT over current (80 Hz or more)
INV compressor start failure. (Missing phase or lock alarm)
Failure of nonvolatile memory IC (EEPROM) on indoor unit control PCB
F12
F16
F17
F24
F23
<<P09>>
<<P01>>
<<P10>>
P12
P14
P03
P04
P05
P16
P17
P22
P26
P29
Overload current detected.
Lock current detected.
No current detected when
compressor was ON.
Compressor 2 (constant speed)
Compressor 2 (constant speed)
Compressor 1 (INV)
Compressor 2 (constant speed)
Discharge temp. sensor trouble Compressor 2 (constant speed)
Outdoor unit protection
Low-pressure trouble
Outdoor unit protection
HIC trouble alarm
Low oil alarm
Connection failure of oil detection sensor
Compressor 1 (INV)
Compressor 2 (constant speed)
Fusing of electromagnetic contact (Current detected when compressor was OFF)
Automatic backup operation
Operating and timer
lamps blinking
altemately
Timer and heat
ready lamp blinking
altemately
Operating and heat
ready lamp blinking
altemately
F29
Operating and timer
lamp blinking
simultaneously
F31
Operating and timer
lamp blinking
simultaneously
Failure of nonvolatile memory IC (EEPROM) on outdoor unit control PCB
Protective
device
Wireless
remote controller
receiver display
Operation
Possible cause of malfunction
OFF:
Standby
for heating
ON:
Timer
1. Contents of Remote Controller Switch Alarm Display
2WAY VRF SYSTEM
Trouble Diagnosis
H11
H12
H03
H13
H15
H06
H31
H07
H08
H27
CHECK
only blinking
5
Timer lamp blinking
(No display changes)
<< >> alarm indication: Does not affect the operation of other indoor units.
< > alarm indication: In some cases may affect the operation of other indoor units.
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2WAY VRF SYSTEM
Trouble Diagnosis
2. Outdoor Unit Control Panel LED Display
(
: ON
: Blinking
: OFF)
LED (RED)
Display meaning
1
2
After the power is turned ON (and automatic address setting is not in progress), no communication
with the indoor units in that system is possible.
(Both ON)
(OFF)
(ON)
(Both OFF)
After power is turned ON (and automatic address setting is not in progress), one or more indoor
units are confirmed in that system; however, the number of indoor units does not match the number
that was set.
Automatic address setting was completed successfully. (After the power is turned ON, and
automatic address setting is not in progress, the number of detected indoor units connected to that
system matches the number that was set, and regular communications are occurring.)
Automatic address setting is in progress.
(Blinking alternately)
At time of automatic address setting, the number of indoor units did not match the number that was
set.
(Both blinking)
(Blinking alternately)
Alarm display
LED 1 blinks M times, then LED 2 blinks N times. The cycle then repeats.
M = 2: P alarm 3: H alarm 4: E alarm 5: F alarm 6: L alarm
N = Alarm No.
Example: LED 1 blinks 2 times, then LED 2 blinks 17 times. The cycle then repeats.
Alarm is “P17.”
5
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2WAY VRF SYSTEM
Trouble Diagnosis
3. Remote Controller Servicing Functions
Sensor temperature display function (displayed
both when unit is running and stopped)
• Use the following check procedure to display the
sensor temperatures from the remote controller,
indoor unit, and outdoor unit sensors on the remote
controller display.
<Check procedure>
➀
Press and hold the
(CHECK) button and
button simultaneously for 4 seconds or
longer.
➁
The following appears on the remote controller
LCD display: unit No. X – X (main unit No.), item
code XX (sensor address), and service monitor
00XX (sensor temperature).
➂
CZ-RTC2
(See figure at right. ➁)
Press the temperature setting
and
buttons to change the item code to the
sensor address of the sensor you wish to monitor.
Example
: Unit No.
: Item code (sensor address)
: Discharge temp. (TD)
(For the relationship between the sensor address
and sensor type, refer to the sensor temperature
relationship table on next page.)
➃
If group control is in effect, press the
button to change to the unit you wish to monitor.
➄
Press the
(CHECK) button to return to normal
remote controller operation.
<Note> The temperature display for units that are not
connected appears as “- - - -.”
•
If monitor mode is engaged during ordinary
operation, the only parts of the LCD display that
change are those shown in ➁ in the figure.
The other parts remain unchanged during normal
operation.
5
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2WAY VRF SYSTEM
Trouble Diagnosis
3. Remote Controller Servicing Functions
Sensor Temperature Relationship Table
Location where sensor
is installed
Sensor address
Sensor type
Sensor address
Remote controller temperature
Sensor type
Discharge temperature sensor
Indoor unit intake temperature
Indoor unit heat exchanger
temperature (E1)
Indoor unit
Indoor unit electronic expansion
valve position
Indoor unit heat exchanger
temperature (E3)
Unit No. Unit No.
1
2
Unit No. Unit No.
1
2
Discharge temperature 1
Outside air temperature
Discharge temperature 2
CT2
High-pressure sensor temperature
Low-pressure sensor temperature
Heat exchanger gas 1
Detected reservoir tank temp.
Heat exchanger liquid 1
Detected oil temp. 1
Heat exchanger gas 2
Detected oil temp. 2
Outdoor unit
Heat exchanger liquid 2
5
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
With type 96, the INV compressor is compressor 1, and the constant-speed
compressor is compressor 2.
With type 72, the INV compressor is compressor 1.
Alarm code
E06
E12
E15
E16
E20
E24
Alarm meaning
Page
E25
E26
E29
Outdoor unit failed to receive serial communication signals from indoor unit.
Automatic address setting start is prohibited.
Automatic address setting alarm (too few units)
Automatic address setting alarm (too many units)
No indoor units at automatic address setting.
Outdoor unit (INV) failed to receive communications from another outdoor
unit (constant-speed).
Outdoor unit address setting failure (duplication)
Mismatch in outdoor unit quantity
Outdoor unit failed to receive communication from outdoor unit (main)
5-9
5-9
5-9
5-10
5-10
5-10
5-11
5-11
5-11
F04
F05
F06
F07
F08
F12
F16
F17
F23
F24
F31
Compressor 1 discharge temperature sensor trouble
Compressor 2 discharge temperature sensor trouble
Gas temperature sensor trouble at outdoor heat exchanger 1 (In)
Liquid temperature sensor trouble at outdoor heat exchanger 1 (Out)
Outdoor air temperature sensor trouble
Compressor intake temperature sensor trouble
High-pressure sensor trouble
Low-pressure sensor trouble
Gas temperature sensor trouble at outdoor heat exchanger 2 (In)
Liquid temperature sensor trouble at outdoor heat exchanger 2 (Out)
Outdoor unit non-volatile memory (EEPROM) trouble
5-12
5-12
5-13
5-13
5-14
5-14
5-15
5-16
5-13
5-13
5-16
H11
H12
H03
H06
H07
H08
H13
H15
H27
H31
Constant speed compressor 2 overcurrent alarm
Constant speed compressor 2 lock current alarm
Compressor 1 CT sensor disconnected or short-circuit
Low-pressure switch activated
No-oil alarm
Compressor 1 oil detection sensor (connection) trouble
Compressor 2 CT sensor disconnected or short-circuit
Compressor 2 discharge temperature sensor disconnected
Compressor 2 oil detection sensor (connection) trouble
HIC trouble alarm
5-17
5-17
5-18
5-19
5-20
5-21
5-18
5-18
5-21
5-21
L04
L10
L17
L18
Outdoor system address duplication
Outdoor unit capacity not set
Outdoor unit model mismatch
4-way valve operation failure
5-22
5-22
5-22
5-22
5
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
P03
P04
P05
P16
P17
P22
P26
P29
Compressor 1 discharge temperature trouble
High-pressure switch activated
Reverse phase (or missing phase) detected
Compressor 1 (INV) overcurrent alarm
Compressor 2 discharge temperature trouble
Fan motor trouble
Inverter compressor high-frequency overcurrent alarm
Inverter compressor missing phase or lock alarm
Blinking Inspection Display on the remote
controller
CHECK blinking (1)
CHECK blinking (2)
5-23
5-24
5-24
5-25
5-23
5-25
5-26
5-26
5-26
5-27
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
E06 Alarm
Alarm code
E06
Alarm meaning
Alarm conditions
Probable cause
Outdoor unit failed to receive serial communication signals from indoor unit.
Outdoor unit failed to receive serial communication signals from indoor unit.
(1) The indoor unit power was cut OFF after initial communications were completed.
(2) An open circuit or short circuit occurred in the inter-unit control wiring after initial
communications were completed.
Check the power at the indoor and outdoor units, and check the inter-unit control wiring.
—
—
This alarm is detected after initial communications are completed. Therefore, it does not occur in
cases of “disconnected serial connector,” “no terminal unit set,” or other trouble that occurs
before initial communications are completed. If initial communications have not been completed,
alarm E04 occurs.
Check
Correction
Example
Notes
E12 Alarm
Alarm code
E12
Alarm meaning
Alarm conditions
Automatic address setting start is prohibited.
Automatic address setting was started when automatic address setting was in progress at
another outdoor unit in the same link.
Automatic address setting is in progress at another outdoor unit.
This alarm is not displayed on the remote controller. Therefore check the blinking on the outdoor
unit PCB.
Wait for automatic address setting to be completed at the outdoor unit where it is currently in
progress. Then start automatic address setting again.
—
—
Probable cause
Check
Correction
Example
Notes
E15 Alarm
Alarm code
E15
Alarm meaning
Alarm conditions
Probable cause
Automatic address setting alarm (too few units)
The number of indoor units was too few when automatic address setting was performed.
(1) The number of indoor units set at the indoor unit quantity setting SW (S004, S005) on the
outdoor unit PCB is too many.
(2) The inter-unit control wiring between indoor units has been cut.
(1) Refer to the test run servicing materials and check the indoor unit quantity setting SW (S004,
S005).
(2) Check the inter-unit control wiring at the indoor and outdoor units.
After correcting the indoor unit quantity setting or the inter-unit control wiring, perform automatic
address setting again.
—
2WAY VRF switch position
Check
Correction
Example
Notes
5
S004
S005
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
E16 Alarm
Alarm code
E16
Alarm meaning
Alarm conditions
Automatic address setting alarm (too many units)
• The number of indoor units was too many when automatic address setting was performed.
• After initial communications were completed, an unrecognized unit was detected.
(1) The number of indoor units set at the indoor unit quantity setting SW (S004, S005) on the
outdoor unit PCB is less than the number set.
(2) The inter-unit control wiring is wired incorrectly.
(1) Refer to the test run servicing materials and check the number of indoor units that is set.
(2) Check the inter-unit control wiring at the indoor and outdoor units.
After correcting the indoor unit quantity setting or the inter-unit control wiring, perform automatic
address setting again.
—
—
Probable cause
Check
Correction
Example
Notes
E20 Alarm
Alarm code
E20
Alarm meaning
Alarm conditions
Probable cause
No indoor units at automatic address setting.
When automatic address setting was performed, no indoor units were recognized.
(1) The inter-unit control wiring from the outdoor unit to the indoor units has been cut.
(2) Serial connector 1 (CN001) is disconnected at the outdoor unit.
(3) The power is OFF at all indoor units in the system.
(1) Check whether the inter-unit control wiring from the outdoor unit to the indoor units is cut.
(2) Check whether serial connector 1 (CN001) is disconnected at the outdoor unit.
(3) Check the power at the indoor units.
(1) Reconnect the inter-unit control wire from the outdoor unit to the indoor unit.
—
Position of serial connector CN001 on 2WAY VRF
Check
Correction
Example
Notes
CN001
5
E24 Alarm
Alarm code
E24
Alarm meaning
Alarm conditions
Probable cause
Outdoor unit (INV) failed to receive communications from other outdoor unit (constant-speed).
After initial communications were completed, communications from an outdoor unit stopped.
(1) After initial communications were completed, the control wiring between main and sub
outdoor units was cut.
(2) After initial communications were completed, the outdoor unit power was turned OFF.
—
—
—
—
Check
Correction
Example
Notes
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
E25 Alarm
Alarm code
E25
Alarm meaning
Alarm conditions
Outdoor unit address setting failure (duplication)
Communication by outdoor unit main-sub control wiring was received that contained the same
address as that unit 5 times or more within 3 minutes.
The unit number is set incorrectly.
Check the unit number again.
Correct the incorrect unit number setting.
—
Recovery from this alarm occurs automatically (when communication that contains the same
address is not received for 3 minutes).
Probable cause
Check
Correction
Example
Notes
E26 Alarm
Alarm code
E26
Alarm meaning
Alarm conditions
Mismatch in outdoor unit quantity
After power initialization, the set outdoor unit quantity did not match the number of outdoor units
detected on the outdoor unit main-sub control wiring for 3 minutes or longer.
(1) The outdoor unit quantity is set incorrectly.
(2) The outdoor unit main-sub control wiring is cut.
(1) Check the outdoor unit quantity setting again.
(2) Check the outdoor unit main-sub control wiring.
(1) Correct the incorrect outdoor unit quantity setting.
(2) Repair the outdoor unit main-sub control wiring.
—
Recovery from this alarm occurs automatically (when the set outdoor unit quantity matches the
number of outdoor units detected on the outdoor unit main-sub control wiring).
Probable cause
Check
Correction
Example
Notes
E29 Alarm
Alarm code
E29
Alarm meaning
Alarm conditions
Probable cause
Outdoor unit failed to receive communication from outdoor unit (main).
Outdoor unit communications from outdoor unit (main) were interrupted for 3 minutes or longer.
(1) After initial communications were completed, the outdoor unit main-sub control wiring was
cut.
(2) After initial communications were completed, the RC connector became disconnected.
(3) The power at the outdoor unit (main unit) is turned OFF.
(1) Check the outdoor unit main-sub control wiring.
(2) Check the RC connectors.
(3) Check the power at the outdoor unit (main).
(1) Repair the outdoor unit main-sub control wiring.
(2) Correct the RC connector connection.
(3) Turn ON the outdoor unit (main) power.
—
—
Check
Correction
Example
Notes
5
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
F04, F05 Alarm
Alarm code
F04, F05
Alarm meaning
Compressor 1 discharge temperature sensor trouble, compressor 2 discharge temperature
sensor trouble.
(1) Discharge temp. of 212°F or higher was detected 20 minutes or more after that compressor
stopped operating.
(2) Discharge temp. of 158°F or higher was detected after all compressors had been stopped for
60 minutes or longer.
(3) A/D step is 10 steps or less (short circuit).
(1) Sensor malfunction
• Sensor element malfunction
• Sensor wiring is partially disconnected, resulting in increased electrical resistance.
This alarm does not occur when the wiring is cut or when the connector is not connected to
the outdoor unit PCB.
(2) Crossed wiring or installation error
• The discharge temperature sensor of that compressor is connected to the discharge tube
of the other compressor.
• The connector for the discharge temperature sensor of the problem compressor is
connected to the outdoor unit PCB connector for the other compressor.
(3) Outdoor unit PCB failure
(4) The check valve on the discharge tube for that compressor is wet.
(5) An air short blockage in the area around the outdoor unit has increased the outdoor unit
ambient temperature, reducing the cooling effects after the compressor stops.
(6) There is a cause that results in P03, P17, or P02 alarm.
(7) Electrical noise
(1) Sensor malfunction and outdoor unit PCB failure
Trouble: • Constantly indicates a high temperature.
• When monitoring software or other means are used for monitoring, the discharge
temperature at times fluctuates suddenly and wildly.
• In some cases, the precise temperature may not be known, even when monitoring
software is used.
Check: • Wiggle the sensor and check whether the trouble continues.
• Check whether the connector is partially disconnected from the PCB.
An F04 alarm will not result if the connector is completely disconnected (circuit is
open).
• If the cause is still uncertain, check the following to determine whether a sensor or
PCB failure has occurred.
Step 1: Connect the other compressor discharge sensor, or a discharge sensor where
the F04 alarm has not occurred, to the connector for this compressor on the
PCB. Measure the temperature at the same point (a location where temperature
fluctuations are small), and check whether there is a temperature difference.
Difference → A PCB or sensor failure is possible.
No difference → PCB and sensor are normal.
Step 2: If an abnormality was found at Step 1, connect the problem compressor
sensor to the other compressor connector on the PCB, or to the PCB
connector of a device where the F04 alarm has not occurred. Measure the
temperature at the same point (a location where temperature fluctuations are
small), and check whether there is a temperature difference.
Difference → Sensor failure.
No difference → PCB failure.
It is convenient at this time to have a discharge temperature sensor on hand.
(2) Crossed wiring or installation error
Trouble: Although the other compressor is operating and this compressor is stopped, the
discharge temperature of the other compressor does not increase and the discharge
temperature of this compressor rises.
* The discharge temperature remains high immediately after the compressor stops. Wait
for some time after the compressor stops and observe.
Check: Check for crossed wiring and installation errors.
Continued
Alarm conditions
Probable cause
Check
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
Check
Correction
Example
Notes
(3) Leakage from the discharge tube check valve
Trouble: Although the other compressor is operating and this compressor is stopped, the
discharge temperature of this compressor rises together with the temperature of the
other compressor.
(4) The ambient temperature around the outdoor unit when it is stopped is 109°F or higher.
(5) If the cause is still unknown after checking the above, then it is possible that electrical noise is
the cause of the trouble. It is necessary to provide a line filter or carry out other noise
countermeasures.
(1) Replace the sensor.
(2) Replace the outdoor unit PCB.
(3) Carry out noise countermeasures.
(4) Repair the refrigerant tubing.
(5) Adjust the amount of refrigerant.
(6) Correct the trouble.
(1) Sensor wiring is partially cut.
This alarm does not indicate that the sensor is disconnected.
In order to prevent overheating during operation, the outdoor units in this system will not allow a
compressor to start if the discharge temperature does not decrease while the compressor is
stopped. If a sensor malfunction results in continuous detection of a high discharge temperature,
then the compressor may stop for no apparent reason. The purpose of this alarm is to facilitate
identification of the problem in this case.
F06, F23 Alarm
Alarm code
F06, F23
Alarm meaning
Gas temperature sensor trouble at outdoor heat exchanger 1; Gas temperature sensor trouble at
outdoor heat exchanger 2
(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit).
(1) Sensor malfunction (including connector)
(2) PCB malfunction
(1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote controller monitor or PC monitor to check the temperature that is recognized by
the microcomputer.
—
—
—
Alarm conditions
Probable cause
Check
Correction
Example
Notes
5
F07, F24 Alarm
Alarm code
F07, F24
Alarm meaning
Liquid temperature sensor trouble at outdoor heat exchanger 1; Liquid temperature sensor trouble
at outdoor heat exchanger 2
(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit).
(1) Sensor malfunction (including connector)
(2) PCB malfunction
(1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote controller monitor or PC monitor to check the temperature that is recognized by
the microcomputer.
—
—
—
Alarm conditions
Probable cause
Check
Correction
Example
Notes
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
F08 Alarm
Alarm code
F08
Alarm meaning
Alarm conditions
Outdoor air temperature sensor trouble
(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit)
(1) Sensor malfunction (including connector)
(2) PCB malfunction
(1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote controller monitor or PC monitor to check the temperature that is recognized by
the microcomputer.
—
—
—
Probable cause
Check
Correction
Example
Notes
F12 Alarm
Alarm code
F12
Alarm meaning
Alarm conditions
Compressor intake temperature sensor trouble
(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit)
(1) Sensor malfunction (including connector)
(2) PCB malfunction
(1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote controller monitor or PC monitor to check the temperature that is recognized by
the microcomputer.
—
—
—
Probable cause
Check
Correction
Example
Notes
5
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
F16 Alarm
Alarm code
F16
Alarm meaning
High-pressure sensor trouble (abnormal rise in high pressure) (In some cases this may not be
the result of a high-pressure sensor malfunction.)
• High-pressure SW activated although the detected pressure was lower (439.4 psi or below)
than the high-pressure SW activation pressure: Undershift
• High-pressure SW failed to activate although the detected pressure was higher (497.5 psi or
above) than the high-pressure SW activation pressure: Overshift
• The saturation temperature at the detected pressure is 10°F or more below the highest indoorunit E1 temperature continuously for 30 minutes.
• High-pressure sensor disconnected or open circuit.
Alarm conditions
Probable cause
Check
(1) High-pressure sensor malfunction
(2) Failure to connect the connector to the outdoor unit PCB
(3) Failure to open the service valve
(4) Clogged tubing
(5) Valve leakage
(6) Over-charging
(7) Outdoor unit PCB failure
(8) Electrical noise
(1) High-pressure sensor failure
• Check the sensor resistance value. (Use a tester and measure the resistance between
sensor No. 1 and No. 3)
Resistance of less than 10kΩ indicates a short circuit or other trouble.
Resistance of 10kΩ - 200kΩ is normal. Resistance of more than 200kΩ indicates
an open circuit or other trouble.
• Connect a gauge to the high-pressure outlet and check for changes in the value
dispalyed by the monitoring software, and for large deviation of the gauge pressure.
• During heating, check whether the temperature is lower than the highest indoor-unit E1
temperature.
* The pressure detected by the high-pressure sensor is the highest pressure in the system.
Therefore during heating the converted saturation temperature will never be lower than
any indoor-unit E1 temperature. During cooling this temperature will never be lower
than the outdoor unit liquid temperature.
(2) Failure to open the service valve, clogged tubing, valve leakage, over-charging.
In all of these cases an alarm occurs when there are rapid pressure fluctuations and tracking
of the detected pressure is poor.
• Check the open/closed status of the valve.
• Check for clogging of the tubing.
To check for clogging, disconnect the high-pressure sensor from the PCB and check
whether the high-pressure SW activates.
• Check for valve leakage and over-charging
When valve leakage or over-charging occurs, refrigerant is likely to accumulate in the
outdoor units or indoor units, resulting in a sudden rise in pressure at start that occurs
before the refrigerant in the heat exchanger is discharged.
* The representative valves to check are the liquid valves and mechanical valves.
(3) Outdoor unit PCB failure
• The check items are the same as for a high-pressure sensor malfunction.
A normal PCB is needed to determine whether the problem is a PCB failure or a pressure
sensor malfunction. If an abnormality was found at the check items for a high-pressure
sensor malfunction, first try replacing the PCB and check again.
Trouble is corrected: Outdoor unit PCB failure
Trouble is not corrected: High-pressure sensor malfunction
Continued
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
Correction
Example
(1) Replace the high-pressure sensor.
Caution: Because the high-pressure sensor connection employs a Schrader-type valve, it can
be removed and replaced. However, the high-pressure sensor can be easily
damaged by high voltage; therefore use sufficient caution with regard to static
electricity.
(2) Replace the PCB.
(3) Correct the locations of problems in the refrigeration cycle.
• Correct locations where clogging or leakage has occurred.
• In the case of over-charging, recover refrigerant. (Adjust the amount of refrigerant).
∗ Guide for over-charging
Be sure to connect the gauge to the high-pressure outlet when checking for over-charging.
During cooling: The following does not apply when outdoor air temperature is low or when fan
speed is controlled. When both compressor 1 and compressor 2 are
operating, and the fan mode is 14 (maximum fan speed), then the high
pressure saturation temperature should be approximately 30°F above the
outdoor air temperature. If it is 10°F or more above this level, then it is
possible that over-charging may have occurred.
During heating: There is an indoor unit where refrigerant flow is poor (E1 temperature and
discharge temperature are low), and the mechanical valve of that unit is
opened to 300 pulses or more, and the E1 temperature is close to room
temperature. However be aware that this kind of data results often when
there is a height difference between indoor units. Reducing the amount of
refrigerant will improve the refrigerant flow, however reducing it too much will
increase the likelihood of alarms related to low oil level (scroll-side), the low
pressure SW, and discharge temperature. Use caution.
This alarm may result when the service valve is closed or when valve leakage (particularly from
the mechanical valve) occurs.
F17 Alarm
Alarm code
F17
Alarm meaning
Alarm conditions
Low-pressure sensor trouble
(1) Sensor short circuit
(2) Sensor open circuit
(1) Sensor malfunction (including connector)
(2) PCB malfunction
(1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote monitor or a PC monitor to check the temperature that is recognized
by the microcomputer.
—
—
—
Probable cause
Check
5
Correction
Example
Notes
F31 Alarm
Alarm code
F31
Alarm meaning
Alarm conditions
Outdoor unit non-volatile memory (EEPROM) trouble
(1) Non-volatile memory is not present when power initialization occurs.
(2) Read values do not match after writing to non-volatile memory is complete.
(1) Memory was not inserted after the PCB was replaced.
(2) The lifetime of the non-volatile memory has been reached.
(3) Non-volatile memory is installed incorrectly (wrong direction, bent pins, etc.).
(1) Check the non-volatile memory on the PCB.
—
—
—
Probable cause
Check
Correction
Example
Notes
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
H11, H12 Alarm
Alarm code
H11, H12
Alarm meaning
H11: Constant speed compressor 2 overcurrent alarm
H12: Constant speed compressor 2 lock current alarm
H11: During operation, the compressor current value exceeded 20 A for 30 seconds or longer.
However this alarm is not detected for 4 seconds after the compressor starts.
H12: During operation, the compressor current value exceeded 29 A for 4 seconds or longer.
However this alarm is not detected for 2 seconds after the compressor starts.
(1) Compressor failure (locked or partially locked)
(2) CT circuit failure (including cut wiring)
(3) Missing power phase
(4) Low power voltage
(5) PCB failure
(1) Compressor failure (partially locked)
Trouble: Current value during operation greatly exceeds the value shown above.
Check: When the current for each phase is measured with a clamp meter or similar
instrument, check that the current value for all phases is not high. If MG was forced
ON (use caution), check that compressor noise will not occur or the compressor will
not run with a groaning sound.
(2) CT circuit failure, PCB failure
Trouble:
Check: • Check for poor connector contact.
• Check the continuity of the CT circuit.
• Install a normal CT in place of this CT and check. If current is detected, then the
PCB can be jedged OK.
→CT circuit failure
• Check that current is flowing in the phase where the CT circuit is connected.
→Check voltage and current.
(3) Missing power phase
Trouble: This alarm primarily occurs when the T-phase is missing. When the R-phase or
S-phase is missing, CT trouble or PCB continuity trouble occur. However this may not
be true in the case of a missing phase caused by magnet SW trouble.
Check: There is the possiblility of a magnet SW failure. Therefore, check the phase voltage at
a location that is as close to the compressor as possible.
(4) Low power voltage
Trouble: In most cases, this occurs when another constant-speed compressor (including
compressors in other units) or other dvice starts. It also occurs when the power
wiring is extremely long.
Check: Check the voltage between each of the phases. However if this troube occors when
other devices or compressors start, then an oscilloscope is required.
(5) PCB failure
Trouble:
Check: Check that the current value measured with the clamp meter is not lower than the
value measured with the PC or remote controller.
(6) If the cause is still unknown after checking the above, then it is possible that noise is the
cause of the trouble. It is necessary to connect a PC or other instrument.
(1) Replace the compressor.
(2) Replace the CT circuit.
(3) Repair the power circuit.
(4) Adjust the primary-side power. Repair the power wiring.
(5) Replace the outdoor unit PCB.
(6) Correct the trouble.
* In the case of a compressor failure, it is likely that steps must be taken to correct the cause
of the compressor failure (such as liquid back-up) in order to prevent recurrence. Be sure to
check that there is no cause which may resuit in compressor locking.
—
Alarm conditions
Probable cause
Check
Correction
Example
5
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
H03, H13 Alarm
Alarm code
H03, H13
Alarm meaning
H03: Compressor 1 CT sensor disconnected or short-circuit
H13: Compressor 2 CT sensor disconnected or short-circuit
Compressor 1: Current value of more than 18.0 A is detected while the compressor 1 is stopped.
Compressor 2: Current value at compressor 2 is less than 2.0 A when 2 seconds or more had
passed after the compressors began operation and output.
* No current is detected even though the compressor is operating.
(1) CT circuit failure (including cut wiring, etc.)
(2) Disconnected CT circuit connector
(3) Missing phase where CT circuit is connected
(4) This CT circuit is connected to the connector of the other CT circuit.
(5) PCB failure
(6) Electrical noise
(1) CT circuit failure, PCB failure
Trouble: • Current value during compressor operation is below the threshold value.
Check: • Check that the connector is not disconnected.
• Check the continuity of the CT circuit.
• Install a normal CT in place of this CT and check. If current is detected, then the
PCB can be judged OK.
→CT circuit failure
• Check that current is flowing in the phase where the CT circuit is connected.
→Check voltage and current.
(2) Crossed wiring or installation error
Trouble: When the compressor is stopped, the current value at the other compressor is high.
When this type of condition occurs, seizing-detection control takes priority.
(3) If the cause is still unknown after checking the above, then it is possible that noise is the
cause of the trouble. It is necessary to connect a PC or other instrument.
(1) Replace the CT circuit.
(2) Replace the outdoor unit PCB.
(3) Correct the problem.
(1) The connector was not inserted after the PCB was replaced.
Use a normal CT as a tool to determine whether the trouble is a PCB failure or CT failure.
Alarm conditions
Probable cause
Check
Correction
Example
Notes
H15 Alarm
5
Alarm code
H15
Alarm meaning
Compressor 1 discharge temperature sensor disconnected; Compressor 2 discharge temperature
sensor disconnected
• This alarm occurs when the discharge sensor temperature detector is not inserted into the tube’s
sensor holder, or when the sensor itself has suffered some kind of malfunction other than a cut
wire.
• When outdoor air temperature is 50°F or higher:
Alarm occurs if the temperature detected by the discharge sensor has changed by less than
4°F when the compressor has operated for 10 minutes immediately after start.
• When outdoor air temperature is below 50°F:
Alarm occurs if the temperature detected by the discharge sensor has changed by less than
4°F when the compressor has operated for 30 minutes immediately after start.
(1) Discharge sensor temperature detector is not inserted into the tube’s sensor holder.
(2) Discharge sensor itself has suffered some kind of malfunction other than a cut wire.
(1) Check that the discharge temperature sensor is inserted into the sensor holder.
(2) Check that sufficient heat-conducting putty is applied.
(3) Remove the discharge sensor from the sensor holder and expose the sensor to the outside
air for approximately 5 minutes. Check that the temperature detected by the sensor changes
to match the outside air temperature. (However the sensor cannot detect temperatures at or
below 32°F.)
(1) Install the sensor into the holder, and apply sufficient heat-conducting putty.
(2) If the sensor is malfunctioning, replace it.
Alarm conditions
Probable cause
Check
Correction
Example
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
H06 Alarm
Alarm code
H06
Alarm meaning
Alarm conditions
Low-pressure switch activated
A report occurs during A/C operation when the low-pressure sensor installed at constant
low-pressure parts detects a pressure of 7.3 psi or less continuously for 2 minutes,
or an instantaneous pressure of 2.9 psi or less. (These values represent abnormal low pressure
which may damage the compressor.)
However, the alarm does not actually occur the first 2 times that the above operation takes place.
At these times, the outdoor unit is stopped and the conditions are monitored. The alarm occurs
when the above operation occurs for the fifth time. The first 4 times before the alarm occurs are
called “pre-trip.” After pre-trip occurs, if the low-pressure sensor detects a pressure of 21.8 psi or
more for 3 minutes of continuous operation, the pre-trip count is reset to 0.
If the low-pressure sensor detects a pressure of 23.2 psi or less continuously for 30 minutes
when the compressor is stopped, an alarm occurs immediately (no pre-trip).
The A/C unit low pressure has dropped to a level that does not occur under ordinary conditions.
(1) The absolute amount of gas in the system is too low (as a result of insufficient refrigerant
charge or leak).
(2) The refrigerant has accumulated in the circuit and has not returned to the compressor.
Refrigerant has accumulated in a location of one-way flow and cannot escape.
High-pressure level is low, resulting in poor flow of refrigerant in the circuit. (A lower highpressure level results in a smaller difference between low pressure and high pressure, that
may be insufficient to cause refrigerant flow.)
(3) The refrigerant circuit has become closed, and refrigerant has not returned to the
compressor. In some cases when moisture enters the refrigerant circuit, it can freeze at the
low-pressure locations and the resulting ice can block the circuit.
If the alarm occurs when there is sufficient refrigerant in the system ((1) and (3)), liquid
refrigerant has definitely accumulated somewhere in the system. Liquid refrigerant generally
accumulates in high-pressure locations. In this case the high pressure gradually increases
(however it may not increase if the location where the liquid accumulates is sufficiently
large). Depending on the refrigerant saturation temperature, it may also accumulate in low
pressure locations. In this case the high pressure is unlikely to increase.
(1) Check that the service valve is open.
(2) Check that none of the valves (solenoid valves, mechanical valves) in the main refrigerant
circuit is closed due to an operation failure.
(3) Check that there is no possibility of foreign objects or water having entered the refrigerant
circuit.
(4) Check that valve leakage at a stopped sub unit has not resulted in accumulation of
refrigerant at that sub unit.
(5) Check that no refrigerant leakage has occurred.
(1) If there was a valve operation failure, in general it is necessary to replace the valve.
(2) If a foreign object or moisture has entered the circuit, install a strainer or dry core (depending
on the degree of the problem).
(3) If refrigerant has leaked into stopped sub units, it is likely that valve leakage has occurred.
The valve must be replaced.
Probable cause
Check
Correction
5
Example
Notes
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
H07 Alarm
Alarm code
H07
Alarm meaning
Alarm conditions
No-oil alarm
This alarm occurs when oil does not flow for a specified amount of time in tubing where oil
flow constantly. (The presence of oil is detected by a temperature sensor.)
Judgment method:
Tcal (calculated by the formula below from the oil temperature) is compared with the discharge
temperature. If Tcal is higher than the discharge temperature then oil is judged to be present.
If Tcal is lower than the discharge temperature, oil is judged to be not present.
Tcal={(0.0254 · T_oil · LP2 +0.0298 · T_oil · LP +0.8842 · T_oil –2.9953 · LP2 –11.091 · LP +436.94)
+2.9953 · HP2 +11.091 · HP –436.94}/(0.0254 · HP2 +0.0298 · HP +0.8842)
➁These points are calculated from the oil temperature and compared
with the discharge temperature
High pressure
➂Lower than the discharge
Discharge
temperature
temperature: No oil
➃Higher than the discharge
temperature: Oil present
Low pressure
➀Oil temperature
Probable cause
5
Check
Correction
Insufficient amount of oil in the system
(1) The length of system tubing exceeds the allowable tubing length.
(2) The difference in height between system units exceeds the allowable value.
(3) A large amount of oil was drained when a compressor was replaced.
(4) Oil has accumulated in a stopped outdoor unit and has not returned, as a result of refrigerant
circuit clogging or valve leakage at the stopped outdoor unit.
(5) A valve (ORVR, BALV, BPB) in the oil circuit has malfunctioned, or there is clogging of the
circuit (capillaries) which returns oil from the oil separator to the compressor.
(6) If an excessive amount or liquid returns to the compressor, oil foaming may increase oil
discharge. The same occurs when the refrigerant proportion in the compressor is high at start,
due to an open circuit in the crank case heater.
(7) Oil sensor disconnected or open circuit
(1) Check the tubing length and height differences.
(2) Check the operation of system circuit valves.
(3) Check that there is not an excessive amount of liquid return. (Check that there is no
mechanical valve leakage.)
(4) Check the crank case heater (wintertime).
(5) Check that the oil sensor is not disconnected, and that the circuit is not open.
(1) If insufficient oil is a possibility, then charge with additional oil.
(2) If it is clear that a valve failure has occurred, replace the valve.
Example
Notes
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
H08, H27 Alarm
Alarm code
H08, H27
Alarm meaning
Alarm conditions
Trouble (open circuit) with the oil sensor (connection) at compressor 1, compressor 2
This alarm occurs when a connector connection (pins 1 and 2 for compressor 1, pins 4
and 5 for compressor 2) is open.
Disconnected connector
Check that the connector is securely connected.
(1) Connect the connector.
(2) Correct the connection at connector pins 4 and 5.
—
Probable cause
Check
Correction
Example
Notes
H31 Alarm
Alarm code
H31
Alarm meaning
Alarm conditions
HIC trouble alarm
This alarm occurs when the microcomputer identifies a trouble signal (indicating abnormal HIC
temperature or other trouble) from the HIC.
The HIC judges the current and temperature, and outputs the trouble signal. In general this
indicates trouble with the HIC itself.
Overcurrent in HIC circuit, and the resultant abnormal heating, caused by HIC failure
Check the power wiring and connector wiring. If the wiring and connectors are normal, use a
tester to measure the resistance between the compressor HIC power (HIC+) and ground (HIC–).
If there is a short circuit, there is an HIC malfunction.
Probable cause
Check
HIC -
HIC +
5
HIC PCB
Correction
Example
Notes
If an HIC failure is found, replace the PCB.
—
Turn OFF the power, and check the continuity of HIC+ and HIC– on the HIC PCB.
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
L04 Alarm
Alarm code
L04
Alarm meaning
Alarm conditions
Outdoor system address duplication
Communication by inter-unit control wiring was received that contained the same address as that
unit 5 times or more within 3 minutes.
Incorrect outdoor system address settings
Check the system address settings again.
Correct the system address settings.
—
Recovery from this alarm occurs automatically (when communication that contains the same
address as that unit is not received for 3 minutes after detection).
Probable cause
Check
Correction
Example
Notes
L10 Alarm
Alarm code
L10
Alarm meaning
Alarm conditions
Probable cause
Check
Outdoor unit capacity not set
The outdoor unit capacity has not been set, or the setting is not allowed by the system.
This alarm occurs because the capacity has not been set.
Connect the outdoor unit maintenance remote controller. On the outdoor unit EEPROM detailed
setting mode screen, check the value for the outdoor unit capacity (item code 81). Check that it is
not set to “0” or to a capacity that is not allowed.
If item code 81 is incorrect, use the outdoor unit maintenance remote controller and set it
correctly.
* After changing the setting, be sure to reset both the indoor and outdoor power.
—
The outdoor unit maintenance remote controller is required in order to set the capacity in the
outdoor unit EEPROM.
Correction
Example
Notes
L17 Alarm
5
Alarm code
L17
Alarm meaning
Alarm conditions
Probable cause
Outdoor unit model mismatch
This alarm occurs when a unit other than a R410A refrigerant model is connected.
(1) A unit that uses R407C refrigerant, or a R22 model unit, was connected by mistake.
(2) The connected unit is correct, however the refrigerant type setting in the outdoor unit
EEPROM (item code 80) is incorrect.
(1) Check the refrigerant type at the connected unit.
(2) Use the outdoor unit maintenance remote controller and check the item code 80 refrigerant
type. If the setting is incorrect, change it to R410A.
—
—
The outdoor unit maintenance remote controller is required in order to set the refrigerant type in
the outdoor unit EEPROM.
Check
Correction
Example
Notes
L18 Alarm
Alarm code
L18
Alarm meaning
Alarm conditions
4-way valve operation failure
During heating operation (Comp. ON), the highest detected temperature at an outdoor unit
heat exchanger (EXG 1, EXG 2, EXL 1, or EXL 2) was 40°F or more above the outdoor air
temperature (Air Temp.) continuously for 5 minutes or longer, or the detected suction temperature
(SCT) was 40°F or more above the outdoor air temperature continuously for 5 minutes or longer.
(1) The 4-way valve connector (20S CN060) has become disconnected from the control PCB.
(2) The 4-way valve circuit is locked (malfunctioning).
(1) Check the 4-way valve connector (20S CN060).
(2) If the connector is normal, check the 4-way valve wiring and the PCB circuit.
If the connector is normal, correct or replace the problem locations.
—
—
Probable cause
Check
Correction
Example
Notes
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
P03, P17 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
P03, P17
Compressor 1 discharge temperature trouble; Compressor 2 discharge temperature trouble
Temperature is 222°F or higher and pre-trip stop has occurred.
The alarm occurs when pre-trip stop occurs more than once. However the pre-trip counter is
cleared if the compressor operates continuously for a specified length of time.
(1) Clogging of liquid valve capillaries
(2) Insufficient amount of refrigerant (including trouble resulting from an insufficient initial charge
and from gas leakage)
(3) Blocking of low-pressure parts caused by intrusion of foreign objects (moisture, scale, etc.)
(4) Crossing (tubing or PCB connectors) with the other compressor thermistor
(5) Expansion valve operation failure
(6) Accumulation of refrigerant at stopped outdoor units
(7) Compressor discharge sensor failure
(8) PCB failure (A/D conversion failure)
(9) Electrical noise
(1) Clogging of capillaries
Trouble: Compressor discharge temperature does not decrease even when the liquid valve
is ON.
Check: When the liquid valve is operating and the liquid valve is ON, check that the
secondary side of the liquid capillaries is cold.
(2) Insufficient refrigerant
Trouble: Liquid effectiveness is poor.
Check: Check whether or not the superheating temperature is declining if the evaporator
mechanical valve is opened to 300 pulses or more (after checking for foreign object
intrusion).
(3) Foreign object intrusion
Trouble: Liquid valve effectiveness is poor.
Check: Check that there is no difference in the condensation or frost conditions between
the strainer primary-side and secondary-side tubing.
(4) Crossed thermistor
Trouble: The discharge temperature of the other compressor is high although only this
compressor is operating.
When the liquid valve turns ON, the discharge temperature of the other compressor
decreases.
(5) Accumulation of refrigerant in stopped outdoor units
Trouble: • System is OK when all outdoor units are operating, however symptoms of
insufficient gas occur when a certain outdoor unit is stopped.
• Condensation or frost is visible up to the top of the accumulator of the stopped
outdoor unit.
• After an outdoor unit stops, there is the sound of refrigerant flowing into an outdoor
unit that was stopped for a long time.
• When an outdoor unit starts after being stopped for a long time, the start is
accompanied by much vibration.
Check: • Representative parts include the liquid capillaries (secondary side of capillaries will
be cool during cooling operation), mechanical valve, mechanical valve bypass check
valve (sound of refrigerant flow can be heard, and stops when the liquid valve is
closed), hot gas defrost valve (if valve secondary side remains hot even after much
time has passed, be careful not to mistake transmitted heat for a valve failure).
• Ice is growing on the lower parts of some outdoor unit heat exchangers but not on
others.
Because this trouble may occur even in outdoor units with a high operating rate
under conditions of insufficient gas, caution is needed.
(6) Sensor failure
Check: • This alarm is likely to occur when wiring is partially cut. (It is difficult to identify, even
when continuity is checked.) The detected discharge temperature is high.
• Although such conditions rarely occur, a P02 alarm is likely if the detected discharge
temperature is low.
• Replace the sensor with another discharge sensor and compare the temperature
conditions.
(7) If the cause is still unknown after checking the above, then it is possible that electrical noise
is the cause of the trouble.
(1) Replace the sensor.
(2) Replace the outdoor unit PCB.
(3) Correct the problem locations.
All of the probable causes
Operates continuously for a set length of time.
Indicates 2.5 minutes or longer for an inverter unit and 30 seconds or longer for a constantspeed compressor.
5
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
P04 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
5
Correction
Example
Notes
P04
High-pressure switch activated.
The operation of the electronic circuit in the high-pressure switch may short-circuit the terminal
depending on the pressure. A pressure of 478.6 psi or above will short-circuit the terminal. Once
the terminal is short-circuited, it will remain in that state until the pressure goes below 377.1 psi.
(1) Failure of the check valve in the compressor discharge tube.
(2) The service valve is closed.
(3) Clogging of the outdoor heat exchanger during cooling.
(4) An air short in the outdoor unit during cooling.
(5) Failure of the outdoor fan during cooling.
(6) Clogging of the air filter in the indoor unit during heating.
(7) An air short in the indoor unit during heating.
(8) Failure of the indoor fan during heating.
(9) Clogging of the refrigerant circuit.
(10) Failure of the mechanical valve.
(11) Failure of the solenoid valve kit.
(12) Too much refrigerant has been charged.
(13) Failure of the high-pressure switch.
(1) Make sure that the high-pressure switch connector has been properly connected.
(2) If the high-pressure switch is properly connected, connect a high-pressure gauge to the
high-pressure outlet port and monitor the pressure during operation to check the pressure
when the high-pressure switch is activated. Check valve failure is likely if the pressure is less
than 478.6 psi. The following describes checks to be made when the pressure is high.
(3) During cooling, check whether the outdoor unit heat exchanger is clogged. Remove any
foreign material that prevents ventilation.
(4) During cooling, check whether an air short blockage has occurred in the outdoor unit. The
system is operating normally unless the temperature around the outdoor unit is excessively high.
(5) During cooling, check for outdoor fan failure. Check whether the screws securing the fan are
loose and whether the fan connector in the outdoor unit PCB is properly connected.
(6) During heating, check whether the air filters in the indoor unit are clogged. If clogged, clean
the filters.
(7) During heating, check whether an air short blockage has occurred in the indoor unit. The
system operates normally unless the temperature around the indoor unit is excessively high.
(8) During heating, check for indoor fan failure.
(9) Check whether the refrigerant circuit is clogged. Check that all service valves are closed.
Check whether welded locations are clogged.
(10) Check for mechanical valve failure. Check whether the mechanical valves make a clattering
sound when the power is reset. Since the mechanical valve in the indoor unit is in a location
that makes aural inspection difficult, use an electric means to check. Check that the
connector pin of the mechanical valve on the PCB outputs 4 V. In addition, check that the coil
resistance of the mechanical valve is several tens of Ohm (Ω).
(11) Check for solenoid valve kit failure. Removing a coil that is on will result in a clicking sound.
Also, removing a coil that is off will not produce such a sound.
(12) Check whether too much refrigerant has been charged. Too much refrigerant has been
charged if the sub-cool temperature of the condenser is 59°F or more.
Replace damaged components and correct the amount of charged refrigerant.
—
—
P05 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
P05
Reverse phase (or missing phase) detected
This alarm occurs when a reverse phase or missing phase is detected in the L1-L2-L3-N phases.
Reverse phase or missing phase in the L1-L2-L3-N phases
Check the wiring at the power terminal plate.
Switch the phases and reinsert. Check if the result is OK.
—
—
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
P16 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
P16
Compressor 1 (INV) overcurrent alarm
This alarm occurs when current trouble or current detection trouble occur at an inverter frequency
of less than 80 Hz after start (when trouble judgment current is detected in the primary or
secondary current, or when an instantaneous secondary current of 13.5 A or higher is detected.
There is a strong possibility of a compressor failure.
An alarm occurs for current detection trouble when it is judged that no current is flowing after
start (DCCT is damaged). In this case, the cause is a DCCT failure.
Check the power wiring and connector wiring.
It is possible to resolve this trouble by limiting the maximum frequency.
—
—
P22 Alarm
Alarm code
P22
Alarm meaning
Alarm conditions
Probable cause
Check
Fan motor trouble
Fan motor start failure, fan motor Hall IC input failure
Possible causes are a Hall IC input circuit failure and a fan HIC failure.
Check the fan motor wiring, the Hall IC wiring, and the connector connections. If the wiring and
connectors are normal, then check that the capacitor of the Hall IC input circuit is securely
soldered on the outdoor unit control PCB. Also use a tester and measure the resistance between
fan HIC power (HIC+) and ground (HIC–). If there is a short circuit, there is an HIC malfunction.
(+)
(–)
5
Fan circuit on the outdoor unit control PCB
Correction
Example
Notes
If the fan does not start, the below corrections may be effective.
(1) If there is a fan HIC failure or circuit failure, replace the PCB.
(2) If the fan motor is locked, replace the fan motor.
—
Turn OFF the power, and check the continuity of “+” and “–” on the fan circuit PCB.
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2WAY VRF SYSTEM
Trouble Diagnosis
4. 2WAY VRF Alarm Codes
P26 Alarm
Alarm code
P26
Alarm meaning
Alarm conditions
Inverter compressor high-frequency overcurrent alarm
This alarm occurs when current trouble or current detection trouble occurs at an inverter
frequency of 80 Hz or higher after start (when trouble judgment current is detected in the
primary or secondary current, or when an instantaneous secondary current of 13.5 A or higher is
detected).
The detection methods are the same as for P16. However the fact that operation up to high
frequencies is possible does not necessarily mean that a compressor failure is the cause of the
trouble. Start the compressor several times. If alarm P26 occurs every time and alarm P16 does
not occur at all, then the possibility of a compressor failure is low.
Check the power wiring and connector wiring.
It is possible to resolve this trouble by limiting the maximum frequency.
—
—
Probable cause
Check
Correction
Example
Notes
P29 Alarm
Alarm code
P29
Alarm meaning
Alarm conditions
Inverter compressor missing phase or lock alarm
This alarm may occur at start, and occurs when missing phase or lock is detected, and when a
DCCT failure occurs.
Generally this alarm occurs when the refrigerant pressure balance is uneven at start, or when
inverter compressor lock occurs, there is a missing phase in the inverter compressor wiring, or a
DCCT failure occurs. This can be judged to be starting trouble which is not caused by HIC.
Check the power wiring and connector wiring.
DCCT failure (replace PCB) or compressor failure
—
Use a tester to measure the voltage between the DCCT output terminal on the rear of the PCB
and the ground. If the voltage is not within 2 – 3 V, then the DCCT has malfunctioned.
Probable cause
Check
Correction
Example
Notes
CAUTION
Currently the blinking inspection display can be displayed only on the wired remote controller
and system remote controller.
Blinking inspection display (1) (Automatic backup)
5
Alarm code
(Blinking inspection display)
Alarm meaning
Automatic backup is in progress. A/C units can be operated.
Status: The compressor at one of the outdoor units where the outdoor unit fan is running should
be operating.
* Blinking inspection display also occurs when seizing of the compressor magnet SW
is detected. Because this may also be the case, refer to “Blinking inspection display
(compressor magnet SW seizing detection).”
When alarm P16, P22, P26, P29, Hx1, Hx2, or H31 has occurred, correcting the control device
(remote controller, etc.) input engages this mode.
Because alarm P16, P22, P26, P29, Hx1, Hx2, or H31 has occurred, check the alarm history
then refer to the corresponding items.
Follow the instructions in the corresponding items to correct the trouble.
After repairing the malfunctioning locations, reset the power for the system (all outdoor units).
Caution: Automatic backup mode will not be canceled until the power is reset.
Automatic backup mode is not engaged in cases of alarms other than those listed above.
Reasons: • There is no need for automatic backup if recovery is possible by correcting the
remote controller input.
• With alarms for which automatic recovery is possible (such as sensor alarms), the
presence of electrical noise may result in a new alarm. However, it is believed that
this occurs for a comparatively short time only. In these cases, a mode (automatic
backup mode) that limits operation may be engaged.
• Control is not possible when a communications system alarm has occurred.
Automatic backup mode is not engaged in order to avoid causing secondary
damage.
Alarm conditions
Probable cause
Correction
Recovery
Notes
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5. Blinking Inspection Display on the Remote Controller
2WAY VRF SYSTEM
Trouble Diagnosis
Blinking inspection display (2) (compressor magnet SW seizing detection)
Alarm code
(Blinking inspection display)
Alarm meaning
Compressor magnet SW seizing detected
Status: Although an outdoor unit exists where the outdoor unit fan is running, no compressors in
the system are operating.
Because the fan is running only at the outdoor unit where seizing was detected, check
the corresponding outdoor unit.
* The fan may also run on its own when fan cracking prevention control is in effect
or when snowfall sensor input is present. Therefore monitor for approximately 10
minutes if the outdoor unit fans are operating at multiple units.
Current is detected in the CT circuit when the compressor is stopped.
(1) This control is not engaged for the first 30 seconds after the compressor turns ON → OFF.
(2) For 1 minute following the first 30 seconds after the compressor turned ON → OFF, the
threshold for the detected current is 10 A or more continuing for 2 seconds.
(3) All times other than the above:
• If the low-pressure SW has not activated, the threshold for the detected current is 7A or
more continuing for 5 seconds.
• If the low-pressure switch has activated, the threshold for the detected current is 7A or more
continuing for 2 seconds.
(1) Magnet SW malfunction
• The magnet SW has seized, and the compressor is continuing to run.
→ Even when the power is turned OFF, the primary side and secondary side contacts
remain together.
• The conditions of magnet SW operation are poor (difficult to open).
→ When a magnet SW is used in a DC circuit, it may be difficult for the SW to open at times.
In an AC circuit the magnet SW should open instantaneously as long as the current is
within the allowable range. However, this kind of trouble can occur if excessive current
flows, and may prevent the SW from opening.
(2) CT circuit failure or PCB failure (A/D failure)
• CT circuit contact failure
→ Check that the connector is not partially disconnected.
Wiggle the connector to check the connection.*
* These symptoms will not occur if the connector is completely disconnected or the wire is
cut. In these cases alarm Hx3 occurs.
• Current of 7A or higher was detected although the compressor was stopped, or a higher
current was detected at occasional intervals.
• The compressor continues to operate at a time when the outdoor unit should be stopped
(such as when all indoor units are stopped).
→ Check whether or not 200 V is output from the PCB to the magnet SW. If the voltage is
output, there is a PCB failure.
(3) Installation error
• CT1 connector is connected to the compressor 2 side
• CT1 circuit is connected to the compressor 2 side
• CT2 connector is connected to the compressor 1 side
• CT2 circuit is connected to the compressor 1 side
(4) Electrical noise
(1) Replace the CT circuit.
(2) Replace the magnet SW.
(3) Replace the PCB.
If the above probable causes are not the cause of the alarm, it is possible that in rare cases
the alarm may be caused by the effects of noise. See notes.
The effects of electrical noise are difficult to identify unless a PC is connected and the conditions
are monitored for a long period of time.
Alarm conditions
Probable cause
Correction
Notes
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2WAY VRF SYSTEM
Trouble Diagnosis
6. Inspection of Parts
(1) High-pressure switch (63PH1, 63PH2)
• 63PH1: Disconnect the CN042 connector (3P, WHT) from the outdoor unit control panel. Measure the resistance between socket pins 1 and 3. The resistance is OK if the result is 0 Ω.
• 63PH2: Disconnect the CN044 connector (3P, RED) from the outdoor unit control panel. Measure the resistance between socket pins 1 and 3. The resistance is OK if the result is 0 Ω.
(2) Electronic control valve (MOV1, MOV2, MOV4)
After removing the connector from the PCB, use the following methods to check the valves.
• MOV1: Measure the voltage between plug pin 5 and pins 1 through 4 at the CN015 connector (6P, WHT) on
the outdoor unit control PCB. (Because of the pulse output, a simplified measurement method is used. Set
the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage is normal.)
When the voltage is normal, measure the resistance between each pair of pins on the electronic control valve
connector. The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 3, pin 6 – pin 2, pin 6 – pin 4) are
approximately 46Ω. (If the results are 0Ω or ∞, replace the coil.)
• MOV2: Measure the voltage between plug pin 5 and pins 1 through 4 at the CN016 connector (6P, RED) on
the outdoor unit control PCB. (Because of the pulse output, a simplified measurement method is used. Set
the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage is normal.)
When the voltage is normal, measure the resistance between each pair of pins on the electronic control valve
connector. The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 3, pin 6 – pin 2, pin 6 – pin 4) are
approximately 46Ω. (If the results are 0Ω or ∞, replace the coil.)
• MOV4: Measure the voltage between plug pin 5 and pins 1 through 4 at the CN230 connector (6P, BLU) on
the outdoor unit control PCB. (Because of the pulse output, a simplified measurement method is used. Set
the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage is normal.)
When the voltage is normal, measure the resistance between each pair of pins on the electronic control valve
connector. The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 3, pin 6 – pin 2, pin 6 – pin 4) are
approximately 46Ω. (If the results are 0Ω or ∞, replace the coil.)
(3) Crank case heater
• Connect a clamp meter to 1 of the 2 crank case heater wires and measure the current. The current is normal
if the result is 0.15 A or higher. (As a guide, the current should be 0.14 A (180 V) – 0.17 A (220 V).)
5
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2WAY VRF SYSTEM
Trouble Diagnosis
7. Test Pin
When the test pin on the outdoor unit control PCB is short-circuited, each part can be operated individually.
• After turning OFF the main unit power, short circuit the test pin (CN022, WHT), then turn the power back ON.
Output is performed in the sequence shown in the table below, for 0.5 seconds each.
1
Output
Relay RY024
Operation
4-way valve (205)
11
Output
Relay RY012
2
—
—
12
3
—
—
13
Relay RY003
Crank case 2 (CH2)
—
14
Relay RY002
Crank case 1 (CH1)
4
—
5
Relay RY005
Bypass valve (BPV)
6
Relay RY007
Recovery valve (ORVR)
7
8
—
—
—
Operation
Save valve (SAVE)
—
—
—
9
Relay RY017
Refrigerant balance valve (RBV)
10
Relay RY016
Refrigerant adjustment valve (RCV)
5
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2WAY VRF SYSTEM
Trouble Diagnosis
8. Thermister Characteristics Curve
8-1. Room temp.sensor
Temperature sensor
10
9
8
Resistance
7
6
5
4
3
2
1
10
15
20
25
30
35
40
45
50
55
Temperature (˚C)
8-2. Indoor heat exch. coil sensor (E1, E3)
5
40
8
35
7
30
6
25
5
Resistance
Resistance
Indoor Heat Exchanger temperature sensor
[E1, E3]
20
15
4
3
10
2
5
1
0
0
-20
-15
-10
-5
0
5
10
15
20
20
30
40
50
60
Temperature (˚C)
Temperature (˚C)
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2WAY VRF SYSTEM
Trouble Diagnosis
8. Thermister Characteristics Curve
8-3. Outdoor temp. sensor, Compressor suction gas temp. sensor
Outdoor heat exch. coil sensor (C1, C2)
Outdoor temperature, Suction gas temperature (TS) sensor
Heat exchanger temperature, Heat exchanger temperature sensor
35
8
30
7
6
25
5
20
Resistance
Resistance
40
15
10
3
2
1
5
0
4
0
-20 -15 -10 -5
0
5
10
15
20
20
30
40
50
60
Temperature (°C)
Temperature (°C)
8-4. Compressor discharge gas temp. sensor
Discharge gas temp. sensor
7
6
Resistance
5
4
5
3
2
1
80
90
100
110
125
130
Temperature (°C)
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