Panasonic Mini ECO-i User manual

Panasonic Mini ECO-i User manual
SERVICE MANUAL
MINI VRF SYSTEM
Model No.
Outdoor Units
Class
36
52
Model Name
U-36LE1U6
U-36LE1U6E*
U-52LE1U6
U-52LE1U6E*
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
S-07MD1U6 S-09MD1U6 S-12MD1U6
F1 Low Silhouette Ducted
S-07MF1U6 S-09MF1U6 S-12MF1U6 S-15MF1U6 S-18MF1U6
19
24
36
48
54
S-24MU1U6 S-36MU1U6
S-24MF1U6 S-36MF1U6 S-48MF1U6 S-54MF1U6
M1 Slim Low Static Ducted S-07MM1U6 S-09MM1U6 S-12MM1U6 S-15MM1U6 S-18MM1U6
High Static Pressure
E1 Ducted
T1 Ceiling
S-36ME1U6 S-48ME1U6
S-12MT1U6
S-18MT1U6
S-24MT1U6
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
S-18MK1U6 S-19MS1U6** S-24MK1U6
** Necessary to install the External Electronic Expansion Valve Kit (Optional:CZ-P56SVK1U).
85464849297000
REFERENCE NO.
SM830197-00
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.
i
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).
ii
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
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.”
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)
O
Material
Copper tube
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)
5/128 (1.0)
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 of 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
R407C tools
New compatible
tool? 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
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.
iii
Vacuum pump
Outlet
Inlet
3-2.Use R410A exclusive cylinder only.
Valve
Single-outlet valve
(with siphon tube)
Liquid refrigerant should be recharged
with the cylinder standing on end as
shown.
Liquid
New refrigerant R410A cannot be used for
earlier models
1.Compressor specifications are different.
If recharging a R22 or R407C compressor with
R410A, durability will significantly decrease since
some of the materials used for compressor parts are
different.
2.Existing tubing cannot be used (especially R22).
Completely cleaning out residual refrigerating
machine oil is impossible, even by flushing.
3.Refrigerating machine oil differs (R22).
Since R22 refrigerating machine oil is mineral oil, it
does not dissolve in R410A.Therefore, refrigerating
machine oil discharged from the compressor can
cause compressor damage.
R22 refrigerating machine oil
Mineral oil (Suniso oil)
R407C refrigerating machine oil
Synthetic fluid (ether oil)
R410A refrigerating machine oil
Synthetic fluid (ether oil)
iv
CONTENTS
Section 1:
CONTROL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2. Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3. Special Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4. Other Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
5. Operation of Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
6. Outdoor Unit Electronic Control Valve (Motor Valve) Control [MOV1] . . . . 1-10
7. Outdoor Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
8. Indoor Unit Electronic Control Valve Control . . . . . . . . . . . . . . . . . . . . . . . 1-12
9. Indoor Special Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
10. Discharge Gas Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
11. Current Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
12. Pressure Sensor Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
13. 4-Way Valve Failure [L18] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
14. Servicing and Maintenance Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Section 2 :
OUTDOOR UNIT REPAIR PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Layout Diagram: Sensors and Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Layout Diagram: Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
1. Removing Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2. Discharging Oil in Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
3. Recovering Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
4. Checking for Leakage After Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
5. Evacuating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
6. Charging Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
7. Pumping Out Refrigerant from Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . 2-17
8. Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
9. High Pressure Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
Section 3 :
OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER . . . . . . . . . . . . 3-1
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
Section 4 :
REMOTE CONTROLLER FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
1. Simple Settings Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
2. Detailed Settings Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
3. Remote Controller Servicing Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Section 5 :
TROUBLE DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
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. Mini VRF Alarm Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5. Inspection of Parts (Outdoor Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18
v
Mini VRF SYSTEM
Control Functions
Contents
1. CONTROL FUNCTIONS
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2. Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3. Special Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4. Other Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
5. Operation of Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
6. Outdoor Unit Electronic Control Valve (Motor Valve) Control [MOV1] . . . . . . . . . . . . 1-10
7. Outdoor Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
8. Indoor Unit Electronic Control Valve Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
9. Indoor Special Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
10. Discharge Gas Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
11. Current Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
1
12. Pressure Sensor Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
13. 4-Way Valve Failure [L18] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
14. Servicing and Maintenance Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
2
3
4
5
6
1-1
Mini VRF SYSTEM
Control Functions
1. Introduction
OUTDOOR UNIT
Mini VRF is a multi system that is connected to a single outdoor unit. The outdoor unit contains an inverter compressor.
To operate this system, the below settings must be made at the time of the test run.
Table 1-1
Setting item
At shipment
from factory
Settable range
System address
1
System 1 – 30
No. of indoor units
1
1 – (15) units *
* Up to a maximum of 15 indoor units can be set, however the maximum number of units which can be connected
is shown below for each outdoor unit capacity.
Table 1-2
1
Maximum number of connected indoor units
4HP
5HP
6HP
6
8
9
Be sure to connect indoor units so that the resulting indoor-outdoor capacity ratio (total capacity of all indoor units
compared with the outdoor unit capacity) is within the range of 50% – 130%.
2
3
4
5
6
1-2
Mini VRF SYSTEM
Control Functions
2. Compressor Control
2-1. Compressors Mounted on Outdoor Units
Capacity
Type
Compressors mounted
Rotary
4HP
5HP
6HP
DC Inverter
2-2. Compressor Stop Rules
After a compressor stops, it will not start again for a period of 3 minutes (3 minutes forced OFF). However, this
does not apply to the Special Control described later, when operation of the compressor is forcibly stopped as
part of a control operation.
2-3. Roadmap Control
(1) The controls listed below are performed according to the pressure sensor attached to the outdoor unit and
temperature thermistor attached to the indoor / outdoor unit heat exchanger.
* With roadmap control, the pressure detected by the pressure sensor is converted to saturation temperature
before it is used. The temperature that has been converted to the saturation temperature is called the pressure sensor temperature.
(2) This control is performed every 30 seconds.
(3) In the evaporation temperature control and condensation temperature control shown in Figs. 1-1 and 1-2, the
temperatures used to judge each area (A, AB, B, and C) may vary depending on the relationships among
factors including the difference between the room temperature setting and the indoor unit 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 the evaporation temperature and condensation temperature
1
2
Evaporation temperature (=Te) : Lowest temperature of the heat exchangers (E1, E3) in all indoor units.
Condensation temperature (=Tc) : The value used for judgment in Cooling mode and Heating mode is different
depending on the mode.
Cooling mode
: The outdoor unit pressure sensor temperature or the outdoor unit heat
exchanger liquid temperature, whichever temperature is higher.
Heating mode
: The outdoor unit pressure sensor temperature or the indoor unit heat
exchanger temperature (E1) when the heating thermostat is ON, whichever
temperature is higher.
* The E3 temperature may indicate the temperature of superheated gas. Therefore it is not included for detection
of the condensation temperature (=Tc).
3
4
5
6
1-3
Mini VRF SYSTEM
Control Functions
2. Compressor Control
2-3-1. Roadmap control in cooling mode
With this control, the below evaporation temperature control and condensation temperature control are both used.
Control is performed according to the following order of priority:
Control order of priority
Area C > Area B > Area A
Example: When Evaporation temperature control = Area A, and Condensation temperature control = Area C,
then based on the above order or priority, the result is “Area C = Reduce horsepower.”
Evaporation temperature (=Te) control
Horsepower increase permitted
(Area A)
Horsepower increase prohibited
(Area B)
Horsepower decrease
(Area C)
41.1°F
41.0°F
1
35.6°F
35.4°F
Fig. 1-1
2
3
(1) For indoor units that are operating in Cooling mode, if one unit is selected for a test run, then the air intake
temperature difference (difference between the room temperature setting and indoor unit air intake temperature) is ignored, and areas B and C are considered to be area A for control purposes. (This is used for additional refrigerant charging, test run checks, etc.)
For this reason, vapor may be discharged if the test run continues for a long period of time, however this does
not indicate a problem. In addition, the test run is canceled automatically after 1 hour.
(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.
4
(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.
5
Condensation temperature (=Tc) control
(Area D)
Thermostat OFF
6
133.7°F
133.5°F
Horsepower decrease
(Area C)
Horsepower increase prohibited
(Area B)
Horsepower increase permitted
(Area A)
126.6°F
126.5°F
124.7°F
124.5°F
Fig. 1-2
1-4
Mini VRF SYSTEM
Control Functions
2. Compressor Control
2-3-2. Roadmap control in heating mode
Roadmap control is performed using the below condensation temperature control.
Condensation temperature (=Tc) control
(Area D)
Thermostat OFF
133.7°F
133.5°F
Horsepower decrease
(Area C)
Horsepower increase prohibited
(Area B)
Horsepower increase permitted
(Area A)
123.9°F
123.8°F
120.2°F
120.0°F
Fig. 1-3
(1) For indoor units that 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 Fig. 1-3 in order to prevent excessive
load. (This is used for test run checks, etc.)
1
(2) Even within the same area, the compressor capacity varies depending on the refrigerant temperature.
(3) 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.
2
(4) 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.
2-3-3. Protection control
Protection control consists of 2 types of protection: compressor air 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 roadmap control.
* In some cases, the control shown below may stop the compressor, issue an alarm, or reduce the compressor
capacity.
(1) Air discharge temperature protection
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)
Air discharge
temperature level
Horsepower (hp) limits
221
+2 hp down
219
+1 hp down
215
+0.5 hp down
210 – Less than 215
Hp increase prohibited
204 – Less than 210
Hp increase permitted (slowly)
Less than 204
No restriction
3
4
5
6
The values shown in the table above are reduced to the
values calculated by roadmap control.
1-5
Mini VRF SYSTEM
Control Functions
2. 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
is not based on a calculated increase/decrease in compressor capacity.
Primary current
Control
Compressor
4 / 5 HP
Stop
Secondary current
Control
6 HP
More than 25.0 A
More than 29.5 A
Secondary current
More than 32.5 A
Hz Down
23.5 A – Less than 25.0 A
28.0 A – Less than 29.5 A
25.0 A – Less than 32.5 A
Hz Not_up
22.5 A – Less than 23.5 A
27.0 A – Less than 28.0 A
24.0 A – Less than 25.0 A
Follows normal operation
Less than 22.5 A
Less than 27.0 A
Less than 24.0 A
2-4. Roadmap Control After Trip
1
When restarting after 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 is cleared if no trip occurs within 10 minutes after operation starts.
2
3
4
5
6
1-6
Mini VRF SYSTEM
Control Functions
3. Special Controls
In addition to ordinary heating and cooling operation, this system also includes the following 4 types of special
controls for control of the system as a whole:
3-1. 4-way valve switching control
3-2. Reverse cycle start control
3-3. Inter systems refrigerant oil recovery control
3-4. Reverse cycle defrost control
3-1. 4-way Valve Switching Control
4-way valve switching control is performed under the following conditions:
• The indoor unit operating mode has been switched (Cooling mode / Heating mode).
• The power is turned ON and the microcomputer has been initialized.
• Reverse cycle start control has ended.
This control is performed in order to ensure reliable switching of the 4-way valve. It also performs control to compensate for tubing heat radiation loss when heating starts after the outdoor unit was stopped for a long time, and
control for oil recovery.
(1) Control when the outdoor unit heat exchanger is functioning as a condenser (indoor unit mode = Cooling)
Control time
Outdoor units
Indoor
units
1 minute
1
Operates at a compressor frequency of 44 Hz.
Electronic
control valve
All indoor units operate at a fixed pulse according to the indoor
unit capacity.
Fan
The fan operates at the set fan speed, is stopped, or operates at
“L” fan speed, according to the operation mode of the indoor unit.
* When the above operation is finished, normal operation starts at the horsepower determined by the indoor
units where thermostats are ON.
2
3
(2) Control when outdoor unit heat exchanger is functioning as an evaporator (indoor unit mode = Heating)
Control time
Outdoor units
Indoor
units
Min. 1 minute to Max. 5 minutes
(until Tc 95°F)
Operates at a compressor frequency of 44 Hz.
Electronic
control valve
All indoor units operate at 480 pulses.
Fan
The fan stops.
4
5
* When the above operation is finished, normal operation starts at the horsepower determined by the indoor
units where thermostats are ON.
6
1-7
Mini VRF SYSTEM
Control Functions
3. Special Controls
3-2. Reverse Cycle Start Control
Reverse cycle start control is performed under the following conditions:
• The outdoor unit starts in Heating mode after microcomputer initialization when the power was turned ON.
• The outdoor unit starts in Heating mode after it was stopped for 1 hour or longer.
When the outdoor unit starts in Heating mode after having been stopped for a long period of time, this control first
operates the unit in Cooling mode to return refrigerant from the outdoor unit heat exchanger to the liquid tubing.
This prevents back-flow of the refrigerant liquid which had accumulated in the outdoor unit heat exchanger.
Control time
Outdoor units
Indoor
units
1
2
1 minute
Operates at a compressor frequency of 46 Hz.
Electronic
control valve
All indoor units operate at a fixed pulse according to the indoor
unit capacity.
Fan
The fan operates at the set fan speed, is stopped, or operates at
“L” fan speed, according to the operation mode of the indoor unit.
3-3. Inter Systems Refrigerant Oil Recovery Control
3-3-1. Inter systems refrigerant oil recovery cycle
In both indoor unit Cooling mode and Heating mode, this control is performed in the cooling cycle after a certain
amount of time has passed.
3-3-2. Start of inter systems refrigerant oil recovery control
This control is performed periodically after the total compressor operating time exceeds 150 minutes.
3-3-3. Flow of inter systems refrigerant oil recovery control
(1) Simplified flow of inter systems refrigerant oil recovery control
3
Inter systems refrigerant oil recovery control follows this flow process:
Normal
operation
1-minute
stop
Control time
4
5
6
Outdoor units
Indoor
units
Inter systems refrigerant oil
recovery control (3-minute)
1-minute
stop
Normal
operation
3 minutes (stops once before and after control)
Operates at a compressor frequency of 65 Hz.
However depending on the operating conditions, the frequency
may be lower than this value.
Electronic
control valve
All indoor units operate at a fixed pulse according to the indoor
unit capacity.
Fan
The fan operates at the set fan speed, is stopped, or operates at
“L” fan speed, according to the operation mode of the indoor unit.
3-4. Reverse cycle Defrost Control
3-4-1. Defrost control method
Defrost with this system is done by reverse cycle defrost.
3-4-2. Conditions for start of defrost
Defrost control is started when the “frost detection” conditions are met, and the “defrost mask time” has elapsed.
1-8
Mini VRF SYSTEM
Control Functions
3. Special Controls
3-4-3. Frost detection
(a) Frost is not detected at the outdoor unit heat exchanger for 5 minutes after operation starts.
(b) Frost is detected when either Condition 1 or 2 below is met.
Heat exchange liquid temperature °F
Defrosting operation
42.8 end temperature
Condition 1:
L2 line or below is detected twice,
each time continuously for 4
minutes, when the compressor is
operating.
50
–6.5
Condition 2:
L1 line or below is detected for a
total of 60 minutes when the
compressor is operating.
(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
1
–9
–13
2
Fig. 1-4
3-4-4. Defrost mask time
The next defrost operation will not start until the defrost mask time (= 35 minutes) has elapsed following the
previous defrost operation.
* While defrost control is in effect, if all indoor units stop, or if the outdoor unit is restarted after it was stopped
for protective control or a similar reason, then defrost control may start again after a minimum of 10 minutes.
3-4-5. General flow of reverse cycle defrost
(1) General flow of reverse cycle defrost control
Reverse cycle defrost control follows this flow process:
Normal
operation
1-minute
stop
Control time
Outdoor units
Indoor
units
Reverse cycle defrost
control (Max. 12-minute)
1-minute
stop
Normal
operation
3
4
Max. 12 minutes (stops once before and after control)
Operates at a compressor frequency of 75 Hz.
The outdoor fan stops.
Electronic
control valve
All indoor units operate at a fixed pulse according to the indoor
unit capacity.
Fan
The fan stops.
5
6
3-4-6. Defrost end judgment conditions
Defrost ends when the below defrost end conditions are met.
Condition 1: Defrost end judgment occurs when the temperature at the temperature sensor installed on the
outdoor heat exchanger is 50°F or higher (or has been 42.8°F or higher continuously for 1 minute).
Condition 2: When the maximum defrost time shown in the table above has elapsed, defrost end judgment
occurs.
1-9
4. Other Control 5. Operation of Solenoid Valves
6. Outdoor Unit Electronic Control Valve (Motor Valve) Control [MOV1]
Mini VRF SYSTEM
Control Functions
4. Other Control
4-1. Indoor Unit Self-Separator Oil Recovery Control
Refer to the indoor unit special control item.
5. Operation of Solenoid Valves
5-1. 4-way Valve Control
(1) OFF conditions
• At Cooling mode
• Special control (reverse cycle start control, inter systems refrigerant oil recovery control, reverse cycle defrost
control) is in effect.
(2) ON conditions
• At Heating mode
1
6. Outdoor Unit Electronic Control Valve (Motor Valve) Control [MOV1]
6-1. Power Initialization
The valve position is 480 pulses if the indoor unit has not started once after the power was turned ON.
Operation of the electronic control valve during normal unit operation
2
3
Indoor Unit Heat exchanger status
Cooling
operation
Heating
operation
MOV1
Remarks
Condenser
480
Maximum flow control
Stop
480
–
Evaporator
Stop
65 – Less than 480
0
SH (super heat) control
–
* SH control controls the difference between outdoor heat exchanger liquid temperature and suction
temperature to 2 – 10°F.
4
5
6
1 - 10
Mini VRF SYSTEM
Control Functions
7. Outdoor Fan Control
7-1. Outdoor Fan (Min. Fan Mode and Max. Fan Mode)
These outdoor units utilize a DC fan motor that can be controlled using a maximum of 15 increments (15 fan
modes).
Outdoor unit
Min. fan mode
Max. fan mode
Cooling operation
Outdoor air temp. > 86°F: 3
Outdoor air temp. 86°F: 1
14
Heating operation
21
4
7-2. Fixed Initial Fan Mode
For the first 30 seconds after operation starts, the mode is fixed at the initial mode that was calculated based on
the relationship between the outdoor air temperature and the outdoor unit horsepower.
If the outdoor unit horsepower changes dramatically, the initial mode may be recalculated and may be again fixed
for 30 seconds.
7-3. Operation after initial fan mode is fixed
After the fixed initial fan mode, the fan mode is increased or decreased according to the operating conditions.
(1) Indoor cooling operation
(a) The fan mode is increased when the pressure sensor temperature is high, and is decreased when the
pressure sensor temperature is low.
* The fan mode is always increased when the pressure sensor temperature is 122°F or higher.
(b) The fan mode may be decreased when symptoms of insufficient gas are detected at an indoor unit.
1
2
(2) Indoor heating operation
(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 load.
(c) The fan mode may be increased when the outdoor liquid temperature drops to 44°F or below.
7-4. When Compressor Magnet Switch Seizing Alarm Occurs
Because the high pressure may increase, operation occurs at the maximum fan mode.
• Quiet mode operation
3
4
For the setting procedure, refer to the separate instructions. When Quiet mode is activated, the maximum fan
mode is reduced compared to maximum fan mode during normal operation.
Outdoor unit
Max. fan mode
Cooling operation
12 (*14)
Heating operation
12
5
* However, during cooling operation if the outdoor air temperature is 91°F or higher, the maximum fan mode
is 14.
1 - 11
6
Mini VRF SYSTEM
Control Functions
8. Indoor Unit Electronic Control Valve Control
INDOOR UNIT
8-1. During Normal Control
(1) During Cooling mode operation
Electronic control valve position (pulses)
Outdoor unit operating
Outdoor unit stopped
Stop
20 pulses
20 pulses
Fan
20 pulses
20 pulses
Thermostat OFF
20 pulses
20 pulses
Thermostat ON
55 – 480 pulses
Cooling
Performs SH control
—
* The target value for SH control is 4 – 12°F for the temperature difference between E3 and E1,
depending on the operating conditions.
However, the SH target value may increase if the required level decreases. In this case, because the
electronic control valve position moves toward the closed side, you should not assume that there is
insufficient gas.
1
(2) During Heating mode operation
Electronic control valve position (pulses)
Outdoor unit operating
2
3
Outdoor unit stopped
Stop
55 – 80 pulses
Control to prevent refrigerant
accumulation
85 pulses
Fan
55 – 80 pulses
Control to prevent refrigerant
accumulation
85 pulses
Thermostat OFF
55 – 80 pulses
Control to prevent refrigerant
accumulation
85 pulses
Thermostat ON
55 – 480 pulses
Performs SC distribution control
Heat
—
* The target value for SC control is 10 – 40°F for the temperature difference between the pressure
sensor temperature and E1, depending on the operating conditions.
4
5
6
1 - 12
Mini VRF SYSTEM
Control Functions
8. Indoor Unit Electronic Control Valve Control
9. Indoor Special Control
8-2. During Special Control
Control type
Operating mode
Target indoor units
Cooling
All indoor units
Fixed pulses for cooling, corresponding to
the indoor unit capacity
Heating
All indoor units
480
4-way valve
switching control
Reverse cycle
start control
Electronic control valve position (pulses)
OFF
Fixed pulses, corresponding to the indoor
unit capacity
Fan
Fixed pulses, corresponding to the indoor
unit capacity
Thermostat ON
Fixed pulses, corresponding to the indoor
unit capacity
Thermostat OFF
Fixed pulses, corresponding to the indoor
unit capacity
Heating
Heating
Inter systems
refigerant oil
recovery control
Reverse cycle
defrost control
Cooling / Heating
All indoor units
Fixed pulses, corresponding to the indoor
unit capacity
OFF
Fixed pulses, corresponding to the indoor
unit capacity
Fan
Fixed pulses, corresponding to the indoor
unit capacity
Thermostat ON
Fixed pulses, corresponding to the indoor
unit capacity
Thermostat OFF
Fixed pulses, corresponding to the indoor
unit capacity
1
2
Heating
3
Heating
4
9. Indoor Special Control
9-1. Indoor Unit Thermostat ON/OFF Delay Timer
(1) When an indoor unit thermostat turns ON, the thermostat cannot be turned OFF by the room temperature
thermostat discharge temperature thermostat for 3 minutes.
However, if the condensation temperature (refrigerant temperature detected at the condenser) reaches PX
temperature or higher, the thermostat may turn OFF in order to prevent excessive loads.
5
(2) When an indoor unit thermostat turns OFF, it will not turn ON again for a minimum of 3 minutes.
9-2. Indoor Unit Refrigerant Oil Self-recovery Control
* This control is performed constantly during Cooling mode operation only.
(1) The electronic control valve at indoor units that are stopped, or are in Fan mode or in Cooling mode with thermostat OFF, opens for 1 – 2 minutes.
(2) At indoor units that are in Cooling mode with thermostat ON, the electronic control valve opens from its current
position by approximately 20 pulses.
1 - 13
6
Mini VRF SYSTEM
Control Functions
10. Discharge Gas Temperature
11. Current Protection
10-1. Discharge Gas Temperature Protection
Alarm
The compressor upper-limit discharge temperature is 222°F. If the discharge temperature reaches 222°F, then
the compressor stops. If the discharge temperature reaches 222°F 4 times repeatedly after restart, an alarm
occurs. After the compressor stops, if the discharge temperature at the stopped compressor is at or above 213°F,
the compressor start restriction temperature, then this compressor does not operate until the temperature drops.
List of discharge temperature protections
Compressor
model
Compressor
type
Stop temperature (°F)
Compressor
start restriction
temperature (°F)
Alarm display
Compressor 1
Inverter
222
213
P03
10-2. Control For Detection of Discharge Sensor Failures
• If the temperature is at or above sensor failure temperature (176°F) (value in parentheses) 60 minutes after
the compressor stopped, an alarm occurs.
1
• If the discharge gas temperature remains at or above sensor failure temperature (213°F) for 20 minutes
after the system is stopped, an alarm occurs.
* In this case, in addition to sensor failure, compressor overheating caused by insufficient refrigerant is also a
possibility.
2
List of discharge sensor failures
Compressor
model
Compressor
type
Alarm display
Compressor 1
Inverter
F04
3
11. Current Protection
4
11-1. Fan Motor
Alarm
P22
Description
Occurs when the fan motor detects overcurrent, or when the
fan motor is locked and does not turn.
5
6
1 - 14
11. Current Protection 12. Pressure Sensor Failure
13. 4-Way Valve Failure [L18]
Mini VRF SYSTEM
Control Functions
11-2. Inverter Compressor
Alarm
Description
P16
Occurs when overcurrent (32.5 A) is detected during normal
operation.
P26
Occurs under the same conditions as P16, when the inverter
compressor is operating at 80 Hz or higher.
P29
Occurs when a missing phase or overcurrent (48 A) is detected
when the inverter compressor starts.
H31
Occurs when the HIC detects overcurrent (75 A), and when an
abnormal temperature (302°F) is reached.
The inverter current values include primary current and secondary current.
Alarm judgment uses both of these current values. However, in general the secondary
current is higher than the primary current.
11-3. CT Circuit Detection Failure
Alarm
Compressor 1
(inverter compressor)
H03
Description
Occurs when an open circuit is detected in the inverter
compressor CT circuit.
1
If the operating frequency of the inverter compressor is low, the current value is also low.
As a result, this alarm is detected only when the compressor is stopped.
2
12. Pressure Sensor Failure
This system includes a high-pressure sensor.
12-1. High-Pressure Sensor Failure
Connector disconnection or displacement failure is judged according to the relationship between the high-pressure
sensor temperature, which is detected by the high-pressure sensor, and the various temperature thermistors.
However, if the pressure rises suddenly, a high-pressure sensor failure warning may be judged before the highpressure sensor activates. Therefore check the following before determining that a pressure sensor failure has
occurred:
• Has the service valve been left open?
• Is there a blocked circuit?
• Is there leakage of refrigerant into stopped outdoor units?
Also check the difference between the high-pressure as measured by a manifold gauge and the pressure as
detected by the pressure sensor.
Alarm
F16
Description
3
4
5
High-pressure sensor failure
6
13. 4-Way Valve Failure [L18]
When a 4-way valve coil failure, coil disconnection or similar failure occurs, a judgment is made automatically from
the operating conditions, and an alarm is output.
1 - 15
Mini VRF SYSTEM
Control Functions
14. Servicing and Maintenance Functions
The below functions are available, and are selected by the outdoor unit EEPROM settings.
14-1. Outdoor Unit Noise Countermeasures (outdoor Quiet mode function)
This function reduces the operating noise to lessen the noise produced by the outdoor unit. When this mode is
selected, noise reduction is given priority during operation, and the outdoor fan mode and compressor operating
frequency are restricted (to approximately 80% of capacity).
The following two operations are required in order to engage this mode. (This mode cannot be engaged when neither (1) nor (2) below has been completed.)
(1) Outdoor unit EEPROM settings
Outdoor unit EEPROM 05 can be set from 0 to 1.
1
EEPROM
setting
Max. fan
mode
0
14
Normal operation (setting at time of factory shipment)
100%
1
12
Noise reduced by approx. 3 dB from the catalog value.
Approx. 80%
Effect
Capacity ratio
(2) Short-circuit the “SILENT” 2P pin on the outdoor unit PCB.
Noise reduction mode is engaged constantly when this pin is short-circuited. To operate in noise reduction
mode only at night, or for similar control at other times, use an external timer (field supply).
14-2. Slime Countermeasure: EEPROM 0C (set only on the main unit)
This setting controls the operation of the drain pump.
2
3
4
EEPROM
setting
Details of operation
0
Normal operation (setting at time of factory shipment)
1
Drain pump operates for 20 minutes at 2-hour intervals
2
Drain pump operates for 20 minutes, at intervals of 20 minutes
3
Drain pump operates continuously
14-3. Delayed Start for Each System: Outdoor EEPROM 3E
The operation start time can be delayed according to the set system addresses.
This setting reduces voltage drops by preventing multiple systems from starting at the same time when operation is
restarted after recovery when multiple operating systems were stopped due to a power outage or other cause.
EEPROM
setting
5
6
Effect
0
Delayed start is not performed (setting at time of factory shipment)
1
System address: Delay in seconds before start
2
Start after System address × 2 seconds
3
Start after System address × 3 seconds
<Reference> Indoor unit discharge temperature control
Operating mode
Discharge temperature control value
Change method
Cooling
Heating
53
122
Enter shift value
for indoor EEPROM
setting “1C.”
Enter shift value
for indoor EEPROM
setting “1D.”
The method is the same as ordinary indoor unit discharge temperature shift.
1 - 16
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
Contents
2. OUTDOOR UNIT REPAIR PROCEDURES
Layout Diagram: Sensors and Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Layout Diagram: Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
1. Removing Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2. Discharging Oil in Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
3. Recovering Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
4. Checking for Leakage After Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
5. Evacuating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
6. Charging Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
7. Pumping Out Refrigerant from Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
8. Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
9. High Pressure Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
1
2
3
4
5
6
2-1
Layout Diagram: Sensors and Solenoid Valves
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
TS
(suction thermistor)
MOV
(electronic motor-operated valve)
20S
(4-way valve)
1
2
3
C1
(condenser 1 thermistor)
4
5
6
2-2
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
Layout Diagram: Sensors
TS
(suction thermistor)
1
2
3
C1
(condenser 1 thermistor)
4
5
6
2-3
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
1. Removing Panels
(1) Front panel removal (Fig. 2-1)
• Remove the front panel (remove 3 screws).
(2) Cover A removal (Fig. 2-1)
• Remove the cover A (remove 1 screw).
Front panel
1
2
3
Cover A
4
Fig. 2-1
5
6
2-4
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
2. Discharging Oil in Compressor
Recover the refrigerant in the outdoor unit following the procedures in “3. Recovering Refrigerant.” Remove the
compressor and discharge the oil in it. Refer to “8. Compressor” for detailed procedures.
2-1. Checking the Oil
Acceptance/rejection criteria for the oil
Condition of
refrigeration cycle
Condition of oil
Judgment criteria for changing oil*
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.
1
2
3
4
5
6
2-5
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
3. 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 (air already evacuated),
and hex wrench (4 mm for liquid tube and 5 mm for gas tube).
3-1. 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 gas line and liquid line 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. (See Fig. 2-2)
CAUTION
The remaining refrigerant in the 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,
press-to-release valves.
(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.
1
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 pins on the control PCB in the outdoor unit and short them using the clips of the jumper wire.
Then restore electrical power to the outdoor unit.
2
CAUTION
3
By short-circuiting the AP pins, each electronic expansion 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.
4
Low-pressure outlet port
(For ø5/16" connector)
Manifold
gauge
5
6
Lo
Hi
Refrigerant
recovery unit
Refrigerant recovery cylinder
Fig. 2-2
2-6
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
3. Recovering Refrigerant
3-2. 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
3-2-1. Cooling operation (for all units)
Ball valve is provided in the indoor unit
YES
NO
3-2-3. Refrigerant recovery
procedures (2)
3-2-2. Refrigerant recovery
procedures (1)
Replace or repair faulty unit
Check for leakage in repaired unit
Turn off all equipment in system
When replacing or repairing a faulty
unit, let other normal indoor units run
(excluding indoor unit where refrigerant
is recovered)
YES
Power can independently be turned off
for indoor unit where refrigerant is
recovered
YES
Turn off all equipment in system
Evacuate air from repaired unit
Charge refrigerant in repaired unit
(Amount of charge should equal that
recovered by refrigerant recovery unit)
NO
NO
Modify power to permit turning off
power to refrigerant-recovered
indoor units independently
Open ball valve
1
Ready for operation
Change controllable number of indoor
units (including changes in group
control and integrated-control settings)
END
Other indoor units can operate normally
2
Replace or repair faulty unit
Check for leakage in repaired unit *
Replace or repair faulty unit
Evacuate air from repaired unit *
3
Check for leakage in repaired unit *
Charge refrigerant in repaired unit *
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Evacuate air in repaired unit *
Change controllable number of indoor
units (including changes in group
control and integrated-control settings)
Charge refrigerant in repaired unit *
(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 tube side and the gas tube side ball valves. Refer to each section in the “Installation
Instructions” on refrigerant charging, leak checking, and evacuation procedures.
2-7
4
5
6
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
3. Recovering Refrigerant
3-2-1. Cooling operation (for all units)
(1) Short-circuit the TEST pin (CN44) on the outdoor control PCB.
(2) Let the unit operate for a while, then check if it is running in Cooling mode or Heating mode by touching the gas
line with your finger. If it is running in Heating mode, follow the instructions given in (3) through (5).
Cooling mode : low temperature (lower than 68°F)
Heating mode : high temperature (higher than 140°F)
CAUTION
Be careful when touching the gas line since the tubing may be very hot (about
140°F) during Heating mode.
(3) If the unit is in Heating mode, release the short-circuit across the test run pins on the outdoor control PCB of
the main unit. Then short-circuit the STOP pin (CN49) to stop operation of the unit.
(4) Short-circuit the MODE pin (CN50) on the outdoor control PCB.
* The 4-way valve will not change at this moment; rather, it changes just before start of operation. (It is difficult
to confirm the change by listening for the sound.)
(5) Short-circuit the TEST pin (CN44) on the outdoor control PCB. Let the unit operate for a while, then check if it is
in Cooling mode by carefully touching the gas line.
1
3-2-2. Refrigerant recovery procedures (A) (using ball valve near the indoor unit)
Cooling operation
Ball valve
(separately purchased)
2
Gas tube
Service port
3
4
5
Indoor unit
Outdoor unit
Liquid tube
Fig. 2-3
(1) If a ball valve with a service port has been provided near the indoor unit as shown in Fig. 2-3, follow the
instructions given in (2) through (6) below. If the service port is instead located in the outdoor side, follow the
instructions in “3-2-3. Refrigerant recovery procedures (B).”
(2) After running the unit in Cooling mode for about 5 minutes, fully close the liquid line ball valve.
(3) Run the unit in Cooling mode for 10 to 20 minutes more.
(4) Fully close the gas line service valve.
6
(5) Use hoses to connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder
with each other. (Fig. 2-4) 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
To determine completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.
2-8
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
3. Recovering Refrigerant
Manifold
gauge
Lo
Hi
Refrigerant
recovery unit
Refrigerant
recovery cylinder
Ball valve
(separately purchased)
Gas tube
Service port
Indoor unit
Outdoor unit
1
Liquid tube
Fig. 2-4
2
3
4
5
6
2-9
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
3. Recovering Refrigerant
3-2-3. Refrigerant recovery procedures (B): for indoor unit with no ball valve
Refrigerant in all indoor units and the refrigerant tubing circuit must be pumped into the outdoor unit (referred to as
“pump down”). The maximum refrigerant storage capacity per a single outdoor unit is approx. 123 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.
(1) Using hoses, connect the manifold gauge valves to both the high-pressure and low-pressure outlet ports of
the outdoor unit to be pumped down. Quickly connect each part to prevent air from entering the tubing.
(2) After running the unit in Cooling mode for about 5 minutes, fully close the liquid line valve of the outdoor unit to
be pumped down.
1
(3) When the high-pressure gauge reading shows 478.6 psi or more (or the low-pressure gauge reading falls to
72.5 psi or less), pull out the EXL2 connector (3P) (YEL) (CN037) on the control PCB of the outdoor unit, then
immediately close the gas line service valve.
* As soon as the EXL2 connector is pulled out, F24 alarm (abnormal sensor) immediately turns on and the
outdoor unit stops.
When pulling out the EXL2 connector, be sure to grasp the connector securely
with your fingers and never pull it directly by its wires. When any other connector
CAUTION
except the EXL2 is disconnected, the outdoor unit will not stop. Be sure to pull
out only the EXL2 connector as described.
(4) Turn off power to all equipment in the system. Then pull out the RC1 connector (4P) (BLU) (CN006) on the
outdoor control PCB in the outdoor unit for which pump down has been completed.
(5) Turn on power for all equipment in the system and let the outdoor unit run in Cooling mode.
2
* Because the test run pins on the outdoor control PCB of the unit have been short-circuited, all units start
Cooling mode operation 3 minutes after power ON.
(6) Using hoses with Schrader-type, push-to-release valves, connect the manifold gauge valves to the gas line
service port and the liquid line service port in the outdoor unit to undergo pump-down. (Fig. 2-5)
3
CAUTION
Remaining refrigerant in the system may cause internal pressure. Check that each
valve on the manifold gauge is tightly closed. A Schrader-type, push-to-release
valve is provided for each connection port.
(7) 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.
4
5
6
(8) Recover remaining refrigerant from
the inter-unit tubing and indoor units
using the refrigerant recovery unit.
Low-pressure outlet port
(For ø5/16" connector)
Manifold
gauge
Lo
NOTE
Hi
To determine the completion of
refrigerant recovery, follow the
instructions that came with the
refrigerant recovery unit.
Refrigerant
recovery unit
Refrigerant recovery cylinder
Fig. 2-5
2 - 10
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
4. Checking for Leakage After Repair
4-1. 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 line, and liquid line in the repaired outdoor unit are fully closed.
(2) Connect the manifold gauge valves to the high- and low-pressure sensor outlets of the outdoor unit.
(3) Feed nitrogen gas into the circuit until 362.6 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 (CN46) 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 welded part), and briefly inspect for any leakage.
If there are any leaks, bubbles will show on the tubing surface.
* To continue the air-tight check after the brief leak inspection, turn on power while short-circuiting the AP pins.
Again feed in nitrogen gas to obtain a system pressure of 362.6 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.
Low-pressure outlet port
(For ø5/16" connector)
1
Manifold
gauge
Lo
Hi
2
Nitrogen gas
High-pressure outlet port
(For ø5/16" connector)
3
4
Fig. 2-6
5
4-2. Checking for Leakage in Refrigerant Tubing Between Indoor and Outdoor Units
Refer to the “Installation Instructions” that came with the outdoor unit.
6
2 - 11
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
5. 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.
5-1. Evacuating Repaired Outdoor Unit
(1) Check that each service valve of the gas line, and the liquid line in the outdoor unit are fully closed.
* If the AP pins (CN46) on the outdoor control PCB have already been short-circuited, steps (2) and (5) are not
necessary.
(2) Turn off power to the outdoor unit to be evacuated.
(3) Connect the manifold gauge valves to the high- and low-pressure sensor outlets of the outdoor unit.
(4) Connect the manifold gauge valves to the vacuum pump.
(5) Short-circuit the AP pins on the outdoor control PCB and turn on power to the repaired outdoor unit.
CAUTION
1
By short-circuiting the AP pins and turning on power to the outdoor unit, all
electronic expansion 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.
(6) 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.
2
Low-pressure outlet port
(For ø5/16" connector)
Manifold
gauge
3
Lo
Hi
Vacuum pump
4
High-pressure outlet port
(For ø5/16" connector)
5
6
Fig. 2-7
5-2. Evacuating Refrigerant Tubing Between Indoor and Outdoor Units
Refer to the “Installation Instructions” that came with the outdoor unit.
2 - 12
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
6. Charging Compressor Oil
6-1. 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 of
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.
When installing the oil-charging
tank to the refrigerant system to
serve as a safety bypass circuit for
refrigerant, connect it to the gas
line service port carefully to avoid
releasing refrigerant into the
atmosphere.
CAUTION
(DPR: CV6230817937)
Nipple
(Receiver tank:
CV6380152988)
Perform oil charging
work carefully so that no
liquid refrigerant enters
the charging tank.
Packless valve
1
Fig. 2-8
(1) Evacuation drying in oil-charging tank
With the bottom 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.
Manifold
gauge
Lo
Upper side valve
Open to run,
then close to stop
Hi
2
3
4
Lower side valve
Close to stop
Vacuum pump
5
Fig. 2-9
(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, open the upper and lower valves to begin charging oil into the charging tank.
After the tank is charged, close the lower side valve and draw off any moisture that may have accumulated.
2 - 13
6
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
6. Charging Compressor Oil
Open to run,
then close to stop
Manifold
gauge
Lo
Upper side valve
Hi
Close to stop
Lower side valve
Vacuum pump
Oil
Fig. 2-10
1
2
3
(3) Charging compressor oil into outdoor unit
Connect the lower valve to the low-pressure sensor outlet (with Schrader-type, push-to-release valve) in the
outdoor unit to be oil-charged, and then connect the high-pressure sensor 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 line
service port (with push-to-release valve) to the DPR (Discharge Pressure Regulator). Carry out the connection
work quickly to avoid letting air enter.
CAUTION
The hoses may be subject to internal pressure from the refrigerant inside the outdoor
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 line service port (low-pressure side).
Low-pressure outlet port
(For ø5/16" connector)
Liquid tube service port
(For ø5/16" connector)
Gas tube service port
(For ø5/16" connector)
4
DPR
5
Manifold
gauge
Lo
Close to stop
Hi
Upper side
valve
6
Close to stop
Lower side
valve
Fig. 2-11
2 - 14
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
6. Charging Compressor Oil
Next, start Cooling mode operation of the outdoor unit to be oil-charged. When cooling operation reaches a stable
condition, open each valve corresponding to these procedures in the order given:
Procedure 1: Open the Hi-side gauge manifold valve
Procedure 2: Open the upper valve
Procedure 3: Open the lower valve
Using this series of procedures, the oil in the oil-charging tank will be pushed up by the pressurized refrigerant
under cooling operation. This charges the oil into the outdoor unit through the low-pressure outlet port. If you
wish, you can periodically close the upper valve of the oil-charging tank and shake the tank gently to check the
approximate amount of remaining oil inside.
Low-pressure outlet port
(For ø5/16" connector)
Liquid tube service port
(For ø5/16" connector)
Gas tube service port
(For ø5/16" connector)
DPR
Manifold
gauge
Lo
Hi
Procedure 2: Open
the upper valve
1
2
Upper side
valve
Procedure 1:
Open the Hi-side
manifold gauge valve
3
Lower side
valve
Procedure 3:
Open the lower valve
Fig. 2-12
To terminate the oil charging work, do as follows:
First, close the Hi-side manifold gauge valve and wait momentarily until the Lo-pressure gauge reading shows
stable indication. Next, fully close the Hi-side manifold gauge valve (Procedure 1) and the lower valve (Procedure
3) from the oil-charging tank, in that order. (The above steps are used to equalize the internal pressure at the same
level as the low-pressure sensor outlet and letting refrigerant evaporate in the tank.)
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.
2 - 15
4
5
6
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
6. Charging Compressor Oil
6-2. 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 “6-1. If Refrigerant Has Already Been
Charged to Outdoor Unit” and charge with oil.
Or, alternatively, follow the procedure below.
Low-pressure outlet port
(For ø5/16" connector)
(1) Connect a tube to the low-pressure 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 “5. 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.
Manifold
gauge
Lo
(3) When the unit has been charged with the
designated amount of oil, stop the vacuum pump.
CAUTION
1
Hi
Vacuum pump
Because oil absorbs
moisture readily, this work
must be completed quickly.
High-pressure
outlet port
(For ø5/16"
connector)
Oil
2
Fig. 2-13
6-3. Charging Additional Compressor Oil (After Replacing Compressor)
3
Model name
Compressor model
Q’ty
U-36LE1U6/U-52LE1U6
C-9RVN273H0W
(Inverter-controlled rotary compressor)
1
U-36LE1U6E/U-52LE1U6E
Pre-charged amount of oil (gal)
0.50
The rated amount of oil is pre-charged in the compressors as given below.
4
5
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: C-9RVN273H0W
Remaining oil in the removed compressor: 0.55 gal
Additional oil to be charged: 0.55 gal (remaining oil) – 0.50 gal (rated oil amount) = 0.05 gal
* If the result is a negative amount (remaining oil is less than the rated amount), it is not necessary to discharge
the extra oil from the system.
6
For the method used for additional oil charging after compressor replacement, refer to “6-1. If Refrigerant Has
Already Been Charged to Outdoor Unit.”
2 - 16
7. Pumping Out Refrigerant from Outdoor Unit
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
Required equipment and tools: Jumper wire with clips, adjustable wrench, set of manifold gauge valves, vacuum
pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, and
hex wrench (4 mm for liquid tube and 5 mm for gas tube).
This procedure is used to move refrigerant of the faulty outdoor unit (except compressor) into indoor units, and
refrigerant tubing.
(1) Connect the manifold gauge valves at the Lo-side to the low-pressure sensor outlet 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, with push-to-release valve). Perform the connection work quickly so that no air is
allowed to enter.
* 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.
(2) Short-circuit the TEST pin (CN44) on the outdoor control PCB of the main unit.
(3) After operating the unit for a while, judge whether it is running in Cooling or Heating mode by touching the gas
line cautiously with your fingers. If it is running in Cooling mode, follow the instructions given in (4) through (6).
* The gas line reaches a low temperature (under 68°F) during cooling operation, and a high temperature (over
140°F) during heating operation.
CAUTION
Be careful when testing the temperature of the gas line with your fingers, because
the tubing becomes very hot (about 140°F) when Heating mode is used.
(4) If the unit is in Cooling mode, temporarily release the short-circuit across the test run pins on the outdoor
control PCB of the unit. Then, short-circuit the STOP pin (CN49) to stop operation of the unit.
(5) Short-circuit the MODE pin (CN50) on the outdoor control PCB of the main unit.
* The 4-way valve will not change at this moment; rather, it changes just before start of operation. (It is difficult
to confirm the change by listening for the sound.)
(6) Short-circuit the TEST pin (CN44) on the outdoor control PCB of the unit. Let the unit operate for a while, then
check if it is in Heating mode by cautiously touching the gas line.
1
2
3
4
(7) Slowly close the liquid line service valve of the outdoor unit to be repaired.
(8) When the low-pressure gauge reading shows 72.5 psi or less, pull out the EXL2 connector (3P) (YEL)
(CN037) on the control PCB of the outdoor unit to be repaired and then fully close the gas line service valve
immediately.
5
* By pulling out the EXL2 connector, all outdoor units stop immediately.
CAUTION
While closing the valve, the outdoor unit may suddenly stop. This is because a
protective function, such as for discharge temperature, is working. In this case
also, fully close the gas line service valve immediately.
(9) Connect the high-pressure sensor outlet of the outdoor unit to be repaired to the manifold gauge valves at the
Hi-side. Also connect the manifold gauge valves to the refrigerant recovery unit. Perform the connection work
quickly so that no air is allowed to enter.
(10) 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.
2 - 17
6
7. Pumping Out Refrigerant from Outdoor Unit
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
NOTE
To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery
unit.
Low-pressure outlet port
(For ø5/16" connector)
Manifold
gauge
Lo
1
Hi
Connect from here to
refrigerant recovery unit
2
3
Fig. 2-14
4
5
6
2 - 18
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
8. Compressor
8-1. 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
Failure diagnosis is based on the following remote controller displays: [H01], [H02], [H03] (Compressor : right side
when viewed from front). 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.
Reference: Insulation resistance (Use a DC 500 V insulation resistance meter and measure the insulation
resistance between the electrified and non-electrified parts.)
1
(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 .
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
2
3
8-2. Compressor Replacement
(1) Follow the instructions in “8-4. Replacing the Compressor” and replace compressor in the failed unit.
(2) Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump.
(3) 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 refrigerant tubing.
CAUTION
Do not use the recovered refrigerant. Use a refrigerant cylinder that contains
new refrigerant.
(4) Open the valve on the refrigerant cylinder. When charging with the amount of recovered refrigerant is
completed, or when charging with the amount of recovered refrigerant is not 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 (CN46). Then fully open all valves on the gas tube, and liquid tube.
(5) If charging with 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.
(6) Follow the instructions in “6. Charging Compressor Oil” and charge with the necessary amount of oil.
(7) Remove the manifold gauge.
2 - 19
4
5
6
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
8. Compressor
The connecting port includes a Schrader-type, push-to-release valve.
When disconnecting the hose, pressure will be applied from the refrigerant in
the outdoor unit.
(8) Follow the instructions in “8-3. Dry Core Cleaning” and perform dry core cleaning of the outdoor unit that failed.
CAUTION
8-3. Dry Core Cleaning
If burning or other failures occur repeatedly at compressor, 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.
* The operating pressure is approximately 1.5 times higher than with R22 or R407C. Therefore use R410A dry
cores.
(1) Refer to “Refrigerant recovery procedures (B): for indoor unit with no ball valve” under “3-2. Refrigerant
Recovery Procedures (Indoor Unit).” Perform pump-down of the refrigerant from all indoor units and inter-unit
tubing to the outdoor unit side.
(2) Cut the liquid tube at all outdoor units where dry cores will be attached, then attach the dry cores and ball
valves as shown in Fig. 2-15.
1
(3) Operate outdoor unit (in either Heating or Cooling mode).
(4) Fully close the liquid tube valve and ball valve at the outdoor unit where dry cores will be attached.
(5) Stop operation of outdoor unit.
2
3
(6) Connect a refrigerant recovery device to the liquid tube service port (Schrader-type valve) on the outdoor unit
where dry cores will be attached. Recover the refrigerant that is in the tubing. At this time, be careful that air
does not enter the tubing.
The connecting port includes a Schrader-type, push-to-release valve.
When connecting the hose, internal pressure will be applied from the remaining
CAUTION
refrigerant in the inter-unit tubing. To determine when refrigerant recovery has
been completed, follow the instructions that came with the refrigerant recovery
device.
(7) As shown in Fig. 2-15, disconnect the tube that runs from the liquid tube valve to the ball valve on the outdoor
unit where dry cores will be attached. Then attach the dry cores.
(8) At all outdoor units where dry cores are attached, pressurize with 362.6 psi of nitrogen from the liquid tube
service port and check for leaks.
4
(9) After draining all nitrogen from the tubing, apply vacuum from the liquid tube service port to the outdoor unit
where dry cores are attached until the pressure is –14.7 psig (5 Torr) or less.
(10) Fully open the liquid tube valve and ball valve on the outdoor unit where dry cores are attached.
(11) Operate the outdoor unit for approximately 3 hours (in either Heating or Cooling mode).
5
(12) Follow the above procedure, and replace all dry cores with new dry cores.
(13) Operate all outdoor units for approximately 20 minutes (in either Heating or Cooling mode).
(14) Follow the instructions in “2. Discharging Oil in Compressor” 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.
6
(15) If the results show that dry core cleaning is still necessary (for example, a color phase of 4.0 or higher), return
to Step 13 and repeat until the results are normal (including a color phase of 3.5 or less).
CAUTION
Perform another dry core replacement after approximately 30 hours of system
operation.
(16) Fully close the liquid tube valve and ball valve on the outdoor unit where dry cores are attached.
(17) Connect a refrigerant recovery device to the liquid tube service port (Schrader-type valve) on the outdoor unit
where dry cores are attached. Recover the refrigerant that is in the tubing. At this time, be careful that air does
not enter the tubing.
2 - 20
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
8. Compressor
(18) Remove dry cores. Connect the tube that runs
from the liquid tube valve to the ball valve.
Outdoor unit
Liquid tube
service port
(19) At the outdoor unit where dry cores were removed,
pressurize with 362.6 psi of nitrogen from the liquid
tube service port and check for leaks.
Liquid tube
valve
(20) After draining all nitrogen from the tubing, apply
vacuum to the outdoor unit where dry cores were
removed until the pressure is –14.7 psig ( 5 Torr)
or less using the liquid tube service port.
(21) Refer to the “Installation Instructions”.
Charge with an amount of refrigerant equal to the
amount that was recovered.
Dry core
Ball valve
8-4. Replacing the Compressor
When removing and installing compressors, use
sufficient caution to ensure that water or other
substances do not enter the refrigerant tubing system.
Fig. 2-15
1
Front panel
8-4-1. Replacing the compressor
(A) Replacing the inverter compressor
(Compressor 1 on remote controller alarm display)
2
Removal
(1) Connect a manifold gauge to the high- and lowpressure outlet ports at the outdoor unit where the
compressor will be replaced. Connect the manifold
gauge to a nitrogen cylinder and perform nitrogen
replacement.
Acoustic material
(2) Follow the procedure for removing panels, and
remove the front panel, the right lower panel, and
the electrical component box cover. (Fig. 2-16)
3
Cover A
Fig. 2-16
Welding locations to disconnect (2)
(3) Follow the refrigerant work procedure and recover
the refrigerant.
4
(4) Remove the acoustic material that surrounds the
compressor (3 layers).
(5) Remove the cap from the compressor terminal
plate. Disconnect the power terminal and internal
terminal.
5
(6) Remove the crankcase heater.
Remove the 3 flange washers that are attached to
the compressor legs as shown in Fig. 2-17.
6
(7) Prepare to disconnect the 2 welded locations shown
in Fig. 2-17. Protect the sensors and the surrounding
plates, rubber, lead wires, clamps, and other items.
Ground
(8) Disconnect the 2 welded locations shown in Fig. 2-17.
(9) Tilt the compressor toward you slightly. Lift it off of
the bolt at the rear of the compressor, then pull the
compressor toward you.
Crankcase heater
Washer-with-collar (3 locations)
Cushioning rubber
(3 locations)
Fig. 2-17
2 - 21
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
8. Compressor
9. High Pressure Sensor
Installation
(1) Prepare for installation.
• Remove the rubber stopper and tube cap (welded) from the new compressor.
(2) Install the crankcase heater onto the compressor.
(3) Place the cushioning rubber in the designated positions on the compressor.
(There are 3 pieces for an inverter compressor.)
(4) Set the new compressor into the unit.
(5) Shape the tubes and insert them at the 2 welding locations.
(6) Use nitrogen to replace the air inside the compressor. Perform brazing at all parts.
(7) Increase the pressure to the nitrogen airtightness test pressure of 362.6 psi. Check that no leakage occurs.
(8) Re-install all components that were removed. Re-install the electrical component box in the same position as it
was before.
(9) After the airtightness test is completed, apply vacuum until a pressure of –14.7 psig (5 Torr) or less is reached
at the indoor and outdoor units and in the tubing.
1
2
(10) After applying vacuum, charge with refrigerant.
For the refrigerant charging methods, refer to “Installation
Instructions.”
Charge with the total of the “refrigerant amount at time of
shipment” plus the “additional charge amount.” (Listed on
the nameplate and description label.)
• Be sure to perform refrigerant charge using liquid refrigerant.
High pressure
sensor
Connection port
(Schrader-type)
(11) Never use any refrigerant other than R410A.
9. High Pressure Sensor
3
The high pressure sensor connection port on the outdoor unit
includes a Schrader-type, push-to-release valve. It is not necessary
to recover the refrigerant when removing and installing the sensor.
9-1. Removing the High Pressure Sensor
4
5
6
(1) Refer to “1. Removing Panels” and remove the front panel.
(2) Disconnect the high pressure sensor connector (3P - BLK) from
terminal CN29 on the outdoor unit control PCB of the outdoor unit
where the high pressure sensor will be removed.
(3) Use 2 adjustable wrenches in combination to remove the high
pressure sensor.
The high pressure sensor connection port on
CAUTION
the outdoor unit includes a Schrader-type
valve. When removing the high pressure
sensor, internal pressure will be applied from
the refrigerant in the outdoor unit.
9-2. Installing the High Pressure Sensor
(1) Use 2 adjustable wrenches in combination to install the high
pressure sensor.
Fig. 2-18
2 - 22
Mini VRF SYSTEM
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
1
2
3
4
5
6
3-1
Mini VRF SYSTEM
Outdoor Unit Maintenance Remote Controller
1. Overview
[Service Checker Section]
OUTDOOR UNIT MAINTENANCE REMOTE
CONTROLLER (CZ-RTC2) for MINI 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
1
Outdoor unit maintenance remote controller does not function as an
ordinary remote controller. It is therefore only used for test runs and
during servicing.
System diagram
CZ-RTC2
Outdoor unit maintenance
remote controller
Outdoor unit
Special service checker wiring
Inter-unit control wiring
(Servicing No.: CV6231785082)
2
Outdoor unit
control PCB
Indoor
unit
Indoor
unit
Remote
controller
Remote
controller
Remote controller Ass’y
3
Operation manual included in package.
●
4
●
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.
5
6
3-2
Mini VRF SYSTEM
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.
■ Outdoor unit alarm history monitor
• Displays the outdoor unit alarm history.
1
2
■ Mode settings
• Setting mode 1 and setting mode 2 are used to make the outdoor EEPROM setting.
3
4
5
6
3-3
3. Ordinary Display Controls and Functions
Mini VRF SYSTEM
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
1
●
●
2
●
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
5
6
3-4
3. Ordinary Display Controls and Functions
Mini VRF SYSTEM
Outdoor Unit Maintenance Remote Controller
●
All units start/stop (Fig. 3-1)
<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.
●
Cooling/heating change (Fig. 3-1)
<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. 3-1
●
All units test run (Fig. 3-2)
<Operation>
The
(CHECK) button can be used to start and stop a
test run for all indoor units.
1
• Press and hold for 4 seconds to turn ON.
During the test run “TEST” is displayed.
2
• The status of test runs performed from the indoor unit
remote controller is not displayed on the outdoor unit
maintenance remote controller.
3
Fig. 3-2
●
Double-speed (Fig. 3-3)
• Do not use for actual operation.
(Doing so may damage the devices.)
5
<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.
6
Fig. 3-3
3-5
4
3. Ordinary Display Controls and Functions
Mini VRF SYSTEM
Outdoor Unit Maintenance Remote Controller
■ Display (functions)
•
Use the temperature setting
Item code
and
buttons to change the item code.
Item
Remarks
Outdoor unit alarm
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
Operating status of outdoor unit compressor
7-segment display
Compressor 1 operating time
0 – 99999999 hrs
Outdoor unit power ON time
0 – 99999999 hrs
3
Compressor 1 operation count
0 – 65535 times
4
Alarm history 1 (most recent)
1
2
Alarm history 2
Alarm history 3
Alarm history 4
5
Alarm history 5
Alarm history 6
Alarm history 7
Alarm history 8 (oldest)
6
Firmware version
Display the version No. × 100.
Program version
Display the version No. × 100.
3-6
3. Ordinary Display Controls and Functions
Mini VRF SYSTEM
Outdoor Unit Maintenance Remote Controller
■ XX-YY R.C. (Fig. 3-4)
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” appears when there is only 1 outdoor unit.
Fig. 3-4
1
<Sample displays>
2
3
4
01: <No. of connected indoor units>
4 units connected
02: <Unit Nos. 1, 2, 3, and 4 are
connected>
Fig. 3-5
5
Fig. 3-6
6
3-7
Mini VRF SYSTEM
Outdoor Unit Maintenance Remote Controller
3. Ordinary Display Controls and Functions
■ 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
10
15
ON
OFF
23
26
20
ON
OFF
28
24
22
31
1 ~ 20
ON
ON
OFF
33
29
27
36
21 ~ 40
41 ~ 60
61 ~ 80
is not displayed.
38
Meaning of display colon
39
37
30
ON
OFF
34
32
25
●
19
17
Display of unit Nos. 21 − 40
21
●
18
14
12
ON
Meaning of display colon
16
13
9
7
5
1
OFF
11
8
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
2
• Display of unit Nos. 1 and 2
• Display of unit Nos. 1, 2, and 3
3
• Display of unit Nos. 1, 2, 3, and 4
4
5
6
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.
■ The total compressor operating time is displayed
(A)
(B)
(in 1-hour units) using 8 digits.
• When the first 4 digits are displayed, the bottom
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.
3-8
Mini 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,
displays.
(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
The unit No. of the selected indoor unit, and the
temperature data, are displayed.
2
1
➃ To end monitoring, press the
(CHECK) button.
The display returns to the normal display.
NOTE
The display does not blink.
2
3
4
5
6
3-9
Mini VRF SYSTEM
Outdoor Unit Maintenance Remote Controller
4. Monitoring Operations
■ Display of unit No. 1
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
Indoor unit
Not used
High-pressure sensor temp.
°F
Heat exchanger gas 1
°F
Heat exchanger liquid 1
°F
Not used
Not used
1
Outdoor air temp.
°F
Not used
Inverter primary current
A
Not used
MOV1 pulse
2
Outdoor unit
STEP
Not used
Not used
Not used
Actual operating frequency
Hz
Not used
3
Not used
Not used
Not used
Not used
Not used
4
Not used
Not used
Actual operating frequency
Hz
5
NOTE
0A and subsequent items are outdoor unit data.
6
3 - 10
5. Outdoor Unit Alarm History Monitor
Mini 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,
displays.
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 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.
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.
2
4
1
3
1
2
The alarm history displays the alarm code. (If no alarm
are present, then -- -- is displayed.)
➂ To clear the alarm history, press the
button. (The
outdoor unit alarm history will be cleared.)
3
➃ To exit, press the
(CHECK) button. The display
returns to the normal display.
4
5
6
3 - 11
Mini VRF SYSTEM
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 below.
➂ Press the timer time
and
buttons to
change the setting data.
5
To confirm the changed setting data, press the
button.
(At this time, “
lit.)
2
” stops blinking and remains
➃ During this mode, “
1
” is displayed, blinking.
The outdoor unit address display section displays
“ALL,” the item code number (DN value in the
table), and the setting data (8 digits).
2
(The setting data is displayed in 8 digits. The
display changes between the first 4 digits (Fig. A )
and the last 4 digits (Fig. B ). When the first 4
digits are displayed, the bottom dot of the colon is
illuminated.)
➄ To exit the setting mode, press the
3
1
B
3
Display of last 4 digits
(CHECK)
button.
5
2
4
1
3
A and B are displayed alternately.
(Example shows display of 0000 0001.)
5
DN
6
Parameter
Outdoor unit fan Quiet
mode
Energy saving mode
Energy saving operation
plug
Demand 1 current
Demand 2 current
Description
0 = Disabled
1 = Quiet mode
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)
3 - 12
Mini VRF SYSTEM
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.
(At this time, “
5
” stops blinking and remains 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).
3
1
Fig. 3-7
(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 bottom dot of the colon is lit.)
➄ To exit setting mode, press the
(CHECK) button. Returns to the normal display mode.
A Display of first 4 digits
A
) and the last 4
1
B Display of last 4 digits
2
3
5
2
1
3
<Refrigerant type> A and B are displayed alternately. (Example
shows 0000 0410 (R410A).)
4
List of Item Codes
DN
Parameter
81
Outdoor unit capacity
Description
112 = 36 Type 160 = 52 Type
5
6
3 - 13
– MEMO –
3 - 14
Mini 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
1
2
3
4
5
6
4-1
Mini 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. 4-1). At this time, the
indoor unit fan (or all indoor unit fans in the case of
group control) begins operating.
1
➂
2
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.
➃
Press the temperature setting
/
buttons to select the item code to change.
➄
Press the timer time
desired setting data.
4
/
buttons to select the
* For item codes and setting data, refer to the
following page.
5
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.
5
Fig. 4-1
* If unit No. “
” is displayed, the same setting
will be made for all indoor units.
3
6
6
4-2
CZ-RTC2
Mini 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
1
2
3
4
5
6
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.
4-3
Mini 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. 4-2).
1
3
7
4
At this time, the indoor unit fan (or all indoor unit
fans in the case of group control) begins operating.
2
3
➂
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.
/
buttons to select the
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.
6
1
5
Fig. 4-2
* For item codes and setting data, refer to the
following page.
4
5
1
6
4-4
CZ-RTC2
Mini VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
List of Detailed Setting Items
Item code
Setting data
Item
Type
No.
Description
0000
1-Way Air Discharge
Semi-Concealed (D1)
0006
0010
Cooling
intake
temperature
shift
0005
(Slim) ConcealedDuct (F1, M1)
Concealed-Duct High
Static Pressure (E1)
0007
Ceiling-Mounted (T1)
0008
Wall-mounted (K1)
Floor Standing (P1)
0011
Concealed Floor
Standing (R1)
0003
28 (Type 9)
0005
36 (Type 12)
0007
45 (Type 15)
0009
56 (Type 18, 19)
0011
71 (Type 24)
(For S-24MP1U6, S-24MR1U6)
112 (Type 36)
0017
140 (Type 48)
0018
Group
control
address
Description
4-Way Air Discharge (Mini)
0001
Semi-Concealed (U1, Y1)
22 (Type 7)
0012
Indoor unit
address
No.
Description
0001
Indoor unit
capacity
System
address
No.
80 (Type 24)
0015
(Except S-24MP1U6, S-24MR1U6)
160 (Type 54)
1
0001
Unit No. 1
0002
Unit No. 2
0003
Unit No. 3
0030
Unit No. 30
0099
Not set
0001
Unit No. 1
0002
Unit No. 2
0003
Unit No. 3
0064
Unit No. 64
0099
Not set
0000
Individual (1:1 = Indoor unit with no group wiring)
0001
Main unit (One of the group-control indoor units)
0002
Sub unit (All group-control indoor units except for main unit)
0099
Not set
2
3
010
Shifts intake temperature by –20°F (– 10°C ).
009
Shifts intake temperature by –18°F (– 9°C ).
001
Shifts intake temperature by –2°F (– 1°C ).
0000
No intake temperature shift
0001
Shifts intake temperature by +2°F (+ 1°C ).
0009
Shifts intake temperature by +18°F (+ 9°C ).
0010
Shifts intake temperature by +20°F (+ 10°C ).
Automatic
stop time
after
operation
start
0000
Function disabled
0001
Stops automatically 5 minutes after operation starts.
0002
Stops automatically 10 minutes after operation starts.
*Can be set
in 5-minute
units.
0123
Stops automatically 615 minutes after operation starts.
0124
Stops automatically 620 minutes after operation starts.
0125
Stops automatically 625 minutes after operation starts.
4-5
4
5
6
Mini 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
Temperature shift for
cooling/heating change in
auto heat/cool mode
Cooling
1
(Upper limit)
Heating
2
(Lower limit)
(Upper limit)
(Lower limit)
Change to remote
control temperature
setting range
Drying
3
(Upper limit)
(Lower limit)
Auto heat/cool
4
(Upper limit)
5
(Lower limit)
Humidifier operation
6
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
4-6
Mini 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
1
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
2
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
Drain pump delayed
start time
Humidifier setting
Flap operation mode
Flap swing mode
0002
0003
0000
0001
0000
0001
0002
3
4
5
6
4-7
Mini 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
2
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
1
Setting data
Description
Humidifier ON time
(ON time per 60
seconds)
Repeat timer switching
3
4
5
6
4-8
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
Mini 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)
1
2
3
×
Unit: hour
4
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
).
5
6
4-9
Mini 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 MINI VRF heat-pump models.
<Function>
1
2
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.)
- 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.
3
4
- 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.
5
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.
6
4 - 10
Mini 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
Heating
Fan
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
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.
1
Description
2
3
4
5
6
4 - 11
Mini 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.
1
2
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
(+)
Remote controller temperature setting
Shift temperature
3
(–)
Heating temperature setting
4
5
6
4 - 12
Mini 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.
2
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.
3
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
(Continued)
4 - 13
1
4
5
6
Mini VRF SYSTEM
Remote Controller Functions
2. Detailed Settings Function
(Continued from previous page)
Item code
Item
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.
1
2
3
Description
4
5
6
4 - 14
Mini 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.
1
buttons for 4 seconds
or longer.
Press and hold the
the timer operation
for 4 seconds or longer.
Press and hold the
2
and
buttons Automatic reset
Entire system stops.
and
Press the
the timer operation
buttons
button.
for 4 seconds or longer.
3
4
5
6
4 - 15
Mini 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. 4-3).
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
1
Fig. 4-3
2
3
4
5
6
4 - 16
Mini 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. 4-4 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
* The temperature on the remote controller is
displayed in Celsius (C).
Please note that you will not mistakenly read it in
Fahrenheit (F) on the display.
Fig. 4-4
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.
NOTE
The temperature display appears as “- - - -” for units
that are not connected.
Press the
button to return to normal remote
controller display.
* 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.
1
2
3
4
5
6
4 - 17
Mini VRF SYSTEM
Remote Controller Functions
3. Remote Controller Servicing Functions
Outdoor unit sensors
Indoor unit sensors
1
2
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
Discharge temp. 1
—
High-pressure sensor temp.
Heat exchanger gas 1
Heat exchanger liquid 1
—
—
Outdoor air temp.
—
Inverter primary current
—
MOV1 pulse
—
—
—
Actual operating frequency
—
—
—
—
—
—
—
—
—
3
4
5
6
4 - 18
Mini 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. Mini VRF Alarm Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5. Inspection of Parts (Outdoor Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18
1
2
3
4
5
6
5-1
Mini VRF SYSTEM
Trouble Diagnosis
Blinking:
Wired
remote
control
display
Remote controller is
Serial
communication detecting error signal from
indoor unit.
errors
Mis-setting
Error in receiving serial communication signal.
(Signal from main indoor unit in case of group control)
Ex: Auto address is not completed.
<E01>
Error in transmitting serial communication signal.
<E02>
Indoor unit is detecting error signal from remote controller (and system controller).
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.”)
Error of the outdoor unit in receiving serial communication signal
from the indoor unit.
Improper setting of indoor unit Indoor unit address setting is duplicated.
or remote controller.
Remote controller address connector (RCU. ADR) is duplicated.
(Duplication of main remote controller)
1
2
During auto address setting,
number of connected units
does not correspond to
number set.
Starting auto address setting is prohibited.
When turning on the power
supply, number of connected
units does not correspond to
number set.
(Except R.C. address is “0.”)
Error in auto address setting. (Number of connected indoor units
is less than the number set)
Error in auto address setting. (Number of connected indoor units
is more than the number set)
Indoor unit communication
error of group control wiring.
3
Improper setting.
This alarm message shows that the auto address connector CN100
is shorted while other RC line is executing auto address operation.
4-way valve operation failure
Protective device in indoor
unit is activated.
E08
<<E09>>
E12
E15
E16
E25
Indoor unit address is not set.
Activation of
protective
device
<E06>
E20
Capacity code of indoor unit is not set.
5
E04
No indoor unit is connected during auto address setting.
There are 2 or more indoor units Priority set remote controller
controllers which have operation
mode priority in 1 refrigerant circuit. Non-priority set remote controller
Group control wiring is connected to individual control indoor unit.
4
<<E03>>
Error of outdoor unit address setting.
Error of main indoor unit in receiving serial communication signal
from sub indoor units.
This alarm message shows when the indoor unit for multiple-use is
not connected to the outdoor unit.
Duplication of main indoor unit address setting in group control.
E18
L02
<L03>
L05
L06
L07
L08
<<L09>>
L18
Duplication of outdoor R.C. address setting.
L04
Capacity code of outdoor unit is not set.
L10
Thermal protector in indoor unit fan motor is activated.
Improper wiring connections of ceiling panel.
Float switch is activated.
Wireless
remote controller
receiver display
Operation
Possible cause of malfunction
OFF:
Standby
for heating
ON:
Timer
1. Contents of Remote Controller Switch Alarm Display
<<P01>>
<<P09>>
<<P10>>
Continued
6
5-2
Mini VRF SYSTEM
Trouble Diagnosis
Activation of
protective
device
Protective device in outdoor
unit is activated.
Incorrect discharge temperature. (Comp.)
Operation of O2 sensor
Outdoor unit fan motor is unusual.
Compressor running failure resulting from missing phase in the
compressor wiring, etc. (Start failure not caused by IPM or no gas.)
Overcurrent at time of compressor runs more than 80Hz (DCCT
secondary current or ACCT primary current is detected at a time
other than when IPM has tripped.)
Inverter for compressor is unusual. (DC compressor does not
operate.)
IPM trip (IPM current or temperature)
Thermistor
fault
Indoor thermistor is either
open or damaged.
Outdoor thermistor is either
open or damaged.
Indoor coil temp. sensor (E1)
Indoor coil temp. sensor (E2)
Indoor coil temp. sensor (E3)
Indoor suction air (room) temp. sensor (TA)
Indoor discharge air temp. sensor (BL)
Comp. discharge gas temp. sensor (TD)
Outdoor coil liquid temp. sensor (C1)
Outdoor air temp. sensor (TO)
Compressor intake port temperature sensor (TS)
High pressure sensor
EEPROM on indoor unit PCB failure
Protective
device for
compressor is
activated
Protective device for
compressor is activated.
Wired
remote
control
display
OFF:
Wireless
remote controller
receiver display
Standby
for heating
Possible cause of malfunction
Blinking:
Timer
ON:
Operation
1. Contents of Remote Controller Switch Alarm Display
P03
P14
P22
P16
P26
P29
H31
<<F01>>
<<F02>>
<<F03>>
<<F10>>
<<F11>>
F04
F07
F08
F12
F16
F29
EEPROM on the outdoor unit PCB has failed.
F31
Current is not detected when comp. is ON.
H03
Overload current is detected.
H01
1
2
3
4
5
6
5-3
Mini VRF SYSTEM
Trouble Diagnosis
2. Outdoor Unit Control Panel LED Display
(
LED
D042(1)
: ON
: Blinking
: OFF )
Display meaning
D043(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)
After power is turned ON (and automatic address setting is not in progress), 1 or more indoor
units are confirmed in that system; however, the number of indoor units does not match the
number that was set.
(OFF)
(ON)
(Both OFF)
Automatic address setting was completed successfully. (After the power is turned ON, 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.
1
(Blinking alternately)
At time of automatic address setting, the number of indoor units did not match the number that
was set.
(Both blinking)
2
Alarm display
(Blinking alternately)
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.
3
Example: LED 1 blinks 2 times, then LED 2 blinks 17 times. The cycle then repeats.
Alarm is “P17.”
4
5
6
5-4
Mini VRF SYSTEM
Trouble Diagnosis
3. Remote Controller Servicing Functions
Sensor temperature display function (displayed regardless of whether unit is operating or 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>
(1) Press and hold the
(CANCEL) button an d
(CHECK) button simultaneously for 4 seconds or longer.
(2) The following appears on the remote controller LCD display: UNIT No. X – X (main unit No.), CODE No. XX
(sensor address), and service monitor 00XX
(sensor temperature).
(See figure at right.)
(3) Press the temperature setting
and
(5)
buttons to change the item code to the sensor address of
the sensor you wish to monitor.
(For the relationship between the sensor address and
sensor type, refer to the sensor temperature relationship
table below.)
(4) If group control is in effect, press the
(UNIT)
button to change to the unit you wish to monitor.
(5) Press the
(CHECK) button to return to normal
remote controller operation.
(3)
(1)
1
(4)
Display shows a discharge temperature of 85°C
at unit No. 1-1
2
NOTE
NOTE
The temperature display for units that are not connected
appears as “- - - -.”
If monitor mode is engaged during normal operation, only
the part of the LCD display indicated in the figure changes.
The other parts remain unchanged during normal operation.
The temperature on the remote controller is
displayed in Celsius (C).
Please note that you will not mistakenly read it in
Fahrenheit (F) on the display.
Returns to normal display.
3
Sensor Temperature Relationship Table
Location where
sensor is installed
Indoor unit
Sensor
address
Sensor type
Sensor
address
Sensor type
Room temperature *1
Indoor unit heat exchanger
temperature (E3)
Remote controller
temperature
Discharge temperature
sensor
Indoor unit intake
temperature
—
Indoor unit heat exchanger
temperature (E1)
Indoor unit electronic
expansion valve position
—
5
—
—
Discharge temperature 1
Outdoor unit
4
High-pressure sensor
temperature
CT (Inverter primary current)
Suction temperature (TS)
MOV1 pulse
Outdoor unit heat exchanger
temperature (C1)
Outside air temperature
—
Actual operating Frequency
*1 Main unit only in case of group control.
5-5
6
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini VRF Alarm Codes
Alarms for outdoor units
Alarm Code
Alarm Meaning
Page
E06
Outdoor unit failed to receive serial communication signals from indoor unit.
7
E12
Automatic address setting start is prohibited.
7
E15
Automatic address setting alarm (too few units)
7
E16
Automatic address setting alarm (too many units)
8
E20
No indoor units at automatic address setting.
8
E25
Outdoor unit address setting failure (duplication)
8
F04
Compressor discharge temperature sensor (TD) trouble
9
F07
Liquid temperature sensor trouble at outdoor heat exchanger (C1)
10
F08
Outdoor air temperature sensor (TO) trouble
10
F12
Compressor suction temperature sensor (TS) trouble
10
F16
High-pressure sensor trouble
11
F31
Outdoor unit non-volatile memory (EEPROM) trouble
12
H03
Compressor CT sensor disconnected or short-circuit
12
H31
HIC trouble alarm
13
L04
Outdoor unit address duplication
13
L05
Indoor unit priority duplication (at priority indoor units)
14
L06
Indoor unit priority duplication (at non-priority indoor units) and outdoor unit
14
L10
Outdoor unit capacity not set
14
L18
4-way valve operation failure
15
P03
Compressor discharge temperature trouble
15
P16
Inverter compressor overcurrent alarm
16
P22
Fan motor trouble
16
P26
Inverter compressor high-frequency overcurrent alarm
16
P29
Inverter compressor missing phase or lock alarm
17
1
2
3
4
5
6
5-6
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini 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.
No serial communications 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.
Probable cause
Check
Correction
This alarm is not displayed on the remote controller. Therefore check the blinking LED display
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.
Example
Notes
—
—
1
2
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) on the outdoor
unit PCB is too many.
(2) The inter-unit control wiring between indoor units has been cut.
Check
(1) Refer to the test run servicing materials and check the indoor unit quantity setting SW (S004).
(2) Check the inter-unit control wiring at the indoor and outdoor units.
Correction
After correcting the indoor unit quantity setting or the inter-unit control wiring, perform automatic
address setting again.
—
Example
Notes
3
4
5
CR-CHX06052
6
S004
S004
5-7
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini 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 unit setting SW (S004) on the outdoor unit PCB is too small.
(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
1
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 (CN32) 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 (CN32) is disconnected at the outdoor unit.
(3) Check the power at the indoor units.
(1) Repair inter-unit control wiring from outdoor / indoor units.
(2) Plug connector 1 (CN32) in correctly.
(3) Turn on the power to indoor units.
Check
Correction
2
Example
Notes
—
Position of serial connector 1
CR-CHX06052
3
4
5
CN32
E25 alarm
6
Alarm code
E25
Alarm meaning
Alarm conditions
Probable cause
Check
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.
Correction
Correct the incorrect unit number setting.
Example
—
Notes
Recovery from this alarm occurs automatically (when communication that contains the same
address is not received for 3 minutes).
5-8
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini VRF Alarm Codes
F04 alarm
Alarm code
F04
Alarm meaning
Alarm conditions
Compressor 1 discharge temperature sensor trouble
(1) A temperature of 212°F or higher was detected 20 minutes or longer after that compressor
stopped running.
(2) Temperature is 176°F or higher when the outdoor unit has been stopped for 60 minutes or
longer.
Details are given in the servicing technical materials.
(3) A/D step is 10 steps or less (short circuit).
Probable cause
(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 completely cut or when the connector is not
connected to the outdoor unit PCB.
(2) Outdoor unit PCB failure
(3) 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.
(4) There is a cause that results in P03 alarm.
(5) Electrical noise
Check
(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.
1
Check:
2
• 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).
(2) 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.
(3) 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.
Correction
(1) Replace the sensor.
(2) Carry out noise countermeasures.
(3) Adjust the amount of refrigerant.
(4) Correct the trouble.
Example
Notes
(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.
3
4
5
6
5-9
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini VRF Alarm Codes
F07 alarm
Alarm code
F07
Alarm meaning
Alarm conditions
Liquid temperature sensor (C1) trouble at outdoor heat exchanger
(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
F08 alarm
1
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
2
Correction
Example
Notes
F12 alarm
3
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
4
5
Check
Correction
Example
Notes
—
—
—
—
6
5 - 10
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini VRF Alarm Codes
F16 alarm
Alarm code
F16
Alarm meaning
Alarm conditions
High-pressure sensor trouble
The saturation temperature at the detected pressure is 10°F or more below the highest indoor-unit
E1 temperature continuously for 30 minutes.
Probable cause
(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 for cut wiring.
• Connect a gauge to the high-pressure outlet and check for changes in the value displayed 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 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 valve to check is a mechanical valve.
(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
Check
Correction
Example
(1) Replace the high-pressure sensor.
Caution: Because the high-pressure sensor connection incorporates 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).
1
2
3
4
5
This alarm may result when the service valve is closed or when valve leakage (particularly from
the mechanical valve) occurs.
6
5 - 11
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini VRF Alarm Codes
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
H03 alarm
1
Alarm code
H03
Alarm meaning
Compressor CT sensor disconnected or short-circuit
Alarm conditions
Alarm occurs if the current value is 1.5 A or less when 2 seconds or longer have elapsed after
output from that compressor started.
* No current is detected even though the compressor is operating.
(1) CT circuit failure (including cut wiring, etc.)
(2) Disconnected CT circuit connector
(3) This CT circuit is connected to the connector of the other CT circuit.
(4) PCB failure
(5) 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.
(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.
Probable cause
Check
2
3
4
Correction
Example
Notes
5
6
5 - 12
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini VRF Alarm Codes
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.
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+
1
2
HIC PCB
Correction
Example
Notes
If an HIC failure is found, replace the PCB.
—
Turn OFF the power, and check the conductivity of HIC+ and HIC– on the HIC PCB.
3
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
4
5
6
5 - 13
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini VRF Alarm Codes
L05 alarm
Alarm code
L05
Alarm meaning
Alarm conditions
Probable cause
Check
Indoor unit priority duplication (at priority indoor units)
More than 1 indoor unit set for priority was detected.
More than 1 indoor unit is set for priority.
From the wired remote controller, use the indoor unit EEPROM simple setting mode and check
that the value of item code 04 is “0001.”
Use the wired remote controller and correct the setting if the value of indoor EEPROM item code
04 is incorrect.
—
Correction
Example
Notes
This alarm is displayed at the indoor units that are set for priority. Alarm L06 is displayed at the
indoor units that are not set for priority.
L06 alarm
1
2
3
Alarm code
L06
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
Indoor unit priority duplication (at non-priority indoor units) and outdoor unit
More than 1 indoor unit set for priority was detected in the system.
More than 1 indoor unit is set for priority in the system.
Find the indoor units where alarm L05 has occurred in the system.
Refer to the alarm L05 correction.
—
Alarm L06 occurs as a result of alarm L05. When the duplicated priority settings are corrected,
alarm L06 is also corrected.
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.
—
Correction
4
Example
Notes
The outdoor unit maintenance remote controller is required in order to set the capacity in the
outdoor unit EEPROM.
5
6
5 - 14
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini VRF Alarm Codes
L18 alarm
Alarm code
L18
Alarm meaning
Alarm conditions
4-way valve operation failure
During heating, when 2 minutes and 30 seconds have elapsed after compressor operation started,
the temperature difference between the outdoor air temperature sensor and the heat exchanger
liquid temperature sensor (C1) is 40°F or higher.
(1) The 4-way valve connector (20S CN005) has become disconnected from the control PCB.
(2) The 4-way valve circuit is locked (malfunctioning).
(1) Check the 4-way valve connector (20S CN005).
(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
P03 alarm
Alarm code
P03
Alarm meaning
Compressor discharge temperature trouble
Alarm conditions
Inverter compressor: Temperature is 222°F or higher and pre-trip stop has occurred.
Probable cause
(1) Insufficient amount of refrigerant (including trouble resulting from an insufficient initial charge
and from gas leakage)
Blocking of low-pressure parts caused by intrusion of foreign objects (moisture, scale, etc.)
(2) Expansion valve operation failure
(3) Compressor discharge sensor failure
(4) PCB failure (A/D conversion failure)
(5) Electrical noise
Check
(1) Insufficient refrigerant
Trouble: Liquid effectiveness is poor.
Check whether or not the superheating temperature is declining if the evaporator
Check:
mechanical valve is opened to 300 pulses or more (after checking for foreign
object intrusion).
(2) Sensor failure
Check: • This alarm is likely to occur when wiring is partially cut. (It can be difficult to identify,
even when conductivity 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.
(3) 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.
Correction
Example
Notes
All of the probable causes
Operates continuously for a set length of time.
Indicates 2 minutes 30 seconds or longer for an inverter unit.
1
2
3
4
5
6
5 - 15
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini VRF Alarm Codes
P16 alarm
Alarm code
P16
Alarm meaning
Alarm conditions
Inverter compressor overcurrent alarm
This alarm occurs when current trouble or current detection trouble occurs 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 48 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.
—
—
Probable cause
Check
Correction
Example
Notes
P22 alarm
1
Alarm code
P22
Alarm meaning
Alarm conditions
Probable cause
Check
Fan motor trouble
Fan motor start failure, fan motor Hybrid IC input failure
Possible causes are a Hybrid IC input circuit failure or a fan HIC failure.
Correction
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 conductivity of “+” and “–” on the main PCB.
2
Example
Notes
Check the fan motor wiring, the Hybrid IC wiring, and the connector connections. If the wiring and
connectors are normal, then check that the capacitor of the Hybrid IC input circuit is securely
soldered onto the 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.
P26 alarm
3
4
5
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 48 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
6
5 - 16
Mini VRF SYSTEM
Trouble Diagnosis
4. Mini VRF Alarm Codes
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, 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
1
2
3
4
5
6
5 - 17
Mini VRF SYSTEM
Trouble Diagnosis
5. Inspection of Parts (Outdoor Unit)
(1) Electronic control valve (MOV1)
MOV1: Measure the voltage between plug pin 5 and pins 1 through 4 at the CN41 connector (6P, white)
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.)
If the voltage is normal, measure the resistance between connector pin 5 and pins 1 through 4.
Resistance between pin 5 and pins 1 through 4 should be approximately 46 for all. (If the result is 0
or , then replace the coil.)
(2) Crankcase heater
Connect a clamp meter to 1 of the 2 crankcase 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).)
Test Pin
When the test pin on the outdoor unit main control PCB is short-circuited, each part can be operated individually.
After turning OFF the outdoor unit power, short circuit the test pin (CN44, white), then turn the power back ON.
1
The following operations will start after turning ON the outdoor unit power when the test pin (CN44, white) is
short-circuited.
(1) Set DC fan motor at W5 (FM1 : 340 – 360 rpm, FM2 : 360 – 380 rpm).
(2) 20S turns ON for 0.5 sec.
2
(3) Check Inter-unit control wiring circuit.
If normal state, go to the next step. If not, it stops after LED1 starts blinking at 0.5 sec intervals and LED2
turns off.
(4) Connector CH1 turns ON for 0.5 sec.
3
(5) Do the test to read / write EEPROM.
If normal state, go to the next step. If not, it stops after LED1 starts blinking at 0.5 sec intervals and LED2
lights.
(6) Connector O2 turns ON for 0.5 sec.
4
5
(7) Check inter-outdoor unit control wiring circuit to outdoor unit maintenance remote controller.
If normal state, go to the next step. If not, it stops after LED1 turns off and LED2 starts blinking at 0.5 sec
intervals.
(8) LED1 turns ON for 0.5 sec.
(9) Do the test(1) of circuit for writing micro-computing software.
If normal state, go to the next step. If not, it stops after LED1 starts blinking and LED2 starts blinking at 0.5
sec intervals.
(10) LED2 turns ON for 0.5 sec.
(11) Do the test(2) of circuit for writing micro-computing software.
If normal state, go to the next step. If not, it stops after LED1 starts blinking and LED2 starts blinking at 0.5
sec intervals.
6
(12) Outputs listed below turn ON for 0.5 sec.
No.
1
2
3
4
5
Contents of output
MOV1 – A
MOV1 – B
MOV1 – / A
MOV1 – / B
5 - 18
– MEMO –
5 - 19
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