Daikin | FTXS20K2V1B | Service manual | Daikin FTXS20K2V1B Service manual

SiBE041134
Service
Manual
Inverter Pair
Wall Mounted Type K-Series
[Applied Models]
z Inverter Pair : Heat Pump
SiBE041134
Inverter Pair
Wall Mounted Type
K-Series
zHeat Pump
Indoor Unit
FTXS20K2V1B
FTXS25K2V1B
Outdoor Unit
RXS20K2V1B
RXS25K2V1B
i
Table of Contents
SiBE041134
1. Introduction .............................................................................................v
1.1 Safety Cautions ........................................................................................v
1.2 Used Icons .............................................................................................. ix
Part 1 List of Functions ................................................................ 1
1. Functions.................................................................................................2
Part 2 Specifications .................................................................... 3
1. Specifications ..........................................................................................4
Part 3 Printed Circuit Board Connector Wiring Diagram ............. 5
1. Indoor Unit...............................................................................................6
2. Outdoor Unit............................................................................................8
Part 4 Function and Control........................................................ 10
1. Main Functions......................................................................................11
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
1.11
1.12
Temperature Control ..............................................................................11
Frequency Principle................................................................................11
Airflow Direction Control.........................................................................13
Fan Speed Control for Indoor Unit .........................................................14
Program Dry Operation ..........................................................................15
Automatic Operation...............................................................................16
Thermostat Control.................................................................................17
NIGHT SET Mode ..................................................................................18
ECONO Operation .................................................................................19
INTELLIGENT EYE Operation ...............................................................20
Inverter POWERFUL Operation .............................................................21
Other Functions......................................................................................22
2. Function of Thermistor ..........................................................................23
3. Control Specification .............................................................................24
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
Mode Hierarchy ......................................................................................24
Frequency Control..................................................................................25
Controls at Mode Changing / Start-up....................................................27
Discharge Pipe Temperature Control.....................................................28
Input Current Control..............................................................................29
Freeze-up Protection Control .................................................................30
Heating Peak-cut Control .......................................................................30
Outdoor Fan Control...............................................................................31
Liquid Compression Protection Function................................................31
Defrost Control .......................................................................................32
Electronic Expansion Valve Control .......................................................33
Malfunctions ...........................................................................................36
Part 5 Operation Manual ............................................................. 37
1. System Configuration............................................................................38
2. Operation Manual..................................................................................39
2.1 Remote Controller ..................................................................................39
2.2 AUTO · DRY · COOL · HEAT · FAN Operation ......................................41
Table of Contents
ii
SiBE041134
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.11
Adjusting the Airflow Direction and Rate ................................................43
COMFORT AIRFLOW Operation ...........................................................45
INTELLIGENT EYE Operation ...............................................................46
POWERFUL Operation ..........................................................................48
OUTDOOR UNIT QUIET Operation.......................................................49
ECONO Operation .................................................................................50
OFF TIMER Operation ...........................................................................51
ON TIMER Operation .............................................................................52
WEEKLY TIMER Operation ...................................................................53
Part 6 Service Diagnosis............................................................. 59
1. Troubleshooting with LED .....................................................................60
1.1 Indoor Unit..............................................................................................60
1.2 Outdoor Unit ...........................................................................................60
2. Problem Symptoms and Measures .......................................................61
3. Service Check Function ........................................................................62
4. Troubleshooting ....................................................................................65
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15
4.16
4.17
4.18
4.19
4.20
4.21
4.22
4.23
4.24
Error Codes and Description ..................................................................65
Indoor Unit PCB Abnormality .................................................................66
Freeze-up Protection Control or Heating Peak-cut Control....................68
Fan Motor (DC Motor) or Related Abnormality.......................................70
Thermistor or Related Abnormality (Indoor Unit)....................................72
Refrigerant Shortage ..............................................................................73
Low-voltage Detection or Over-voltage Detection..................................75
Signal Transmission Error (between Indoor Unit and Outdoor Unit) ......77
Unspecified Voltage (between Indoor Unit and Outdoor Unit) ...............79
Outdoor Unit PCB Abnormality...............................................................80
OL Activation (Compressor Overload) ...................................................81
Compressor Lock ...................................................................................82
DC Fan Lock ..........................................................................................83
Input Overcurrent Detection ...................................................................84
Four Way Valve Abnormality..................................................................85
Discharge Pipe Temperature Control.....................................................87
High Pressure Control in Cooling ...........................................................88
Compressor System Sensor Abnormality ..............................................89
Position Sensor Abnormality ..................................................................90
DC Voltage / Current Sensor Abnormality..............................................92
Thermistor or Related Abnormality (Outdoor Unit).................................93
Electrical Box Temperature Rise............................................................95
Radiation Fin Temperature Rise ............................................................97
Output Overcurrent Detection ................................................................99
5. Check ..................................................................................................101
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
iii
Thermistor Resistance Check ..............................................................101
Fan Motor Connector Output Check ....................................................102
Power Supply Waveforms Check.........................................................102
Electronic Expansion Valve Check.......................................................103
Four Way Valve Performance Check ...................................................104
Inverter Units Refrigerant System Check .............................................104
“Inverter Checker” Check .....................................................................105
Rotation Pulse Check on the Outdoor Unit PCB ..................................106
Installation Condition Check.................................................................107
Table of Contents
SiBE041134
5.10
5.11
5.12
5.13
Discharge Pressure Check...................................................................107
Outdoor Fan System Check .................................................................108
Main Circuit Short Check......................................................................108
Power Module Check ...........................................................................109
Part 7 Removal Procedure ........................................................ 110
1. Indoor Unit...........................................................................................111
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
Removal of Air Filters ...........................................................................111
Removal of Horizontal Blade................................................................113
Removal of Front Panel........................................................................115
Removal of Front Grille ........................................................................116
Removal of Vertical Blade ASSYs........................................................117
Removal of Electrical Box ....................................................................119
Removal of Swing Motor / PCBs ..........................................................122
Removal of Indoor Heat Exchanger .....................................................127
Removal of Fan Rotor / Fan Motor.......................................................130
Exchange of Piping Direction (Drain Hose)..........................................133
2. Outdoor Unit........................................................................................134
2.1
2.2
2.3
2.4
2.5
2.6
2.7
Removal of Outer Panels / Fan Motor..................................................134
Removal of Electrical Box ....................................................................143
Removal of PCBs .................................................................................146
Removal of Reactor / Partition Plate ....................................................154
Removal of Sound Blankets .................................................................156
Removal of Four Way Valve.................................................................158
Removal of Compressor.......................................................................161
Part 8 Trial Operation and Field Settings................................. 163
1.
2.
3.
4.
Pump Down Operation........................................................................164
Forced Cooling Operation ...................................................................165
Trial Operation ....................................................................................166
Field Settings ......................................................................................167
4.1
4.2
4.3
4.4
4.5
Model Type Setting ..............................................................................167
When 2 Units are Installed in 1 Room..................................................167
Standby Electricity Saving....................................................................168
Facility Setting Jumper (cooling at low outdoor temperature) ..............168
Jumper Settings ...................................................................................169
5. Application of Silicon Grease to a Power Transistor and
a Diode Bridge ....................................................................................170
Part 9 Appendix......................................................................... 171
1. Piping Diagrams..................................................................................172
1.1 Indoor Unit............................................................................................172
1.2 Outdoor Unit .........................................................................................172
2. Wiring Diagrams..................................................................................173
2.1 Indoor Unit............................................................................................173
2.2 Outdoor Unit .........................................................................................173
Table of Contents
iv
Introduction
SiBE041134
1. Introduction
1.1
Safety Cautions
Cautions and
Warnings
„ Be sure to read the following safety cautions before conducting repair work.
„ The caution items are classified into “
Warning” and “
Caution”. The “
Warning”
items are especially important since they can lead to death or serious injury if they are not
followed closely. The “
Caution” items can also lead to serious accidents under some
conditions if they are not followed. Therefore, be sure to observe all the safety caution items
described below.
„ About the pictograms
This symbol indicates the item for which caution must be exercised.
The pictogram shows the item to which attention must be paid.
This symbol indicates the prohibited action.
The prohibited item or action is shown in the illustration or near the symbol.
This symbol indicates the action that must be taken, or the instruction.
The instruction is shown in the illustration or near the symbol.
„ After the repair work is complete, be sure to conduct a test operation to ensure that the
equipment operates normally, and explain the cautions for operating the product to the
customer.
1.1.1 Cautions Regarding Safety of Workers
Warning
Be sure to disconnect the power cable plug from the plug socket before
disassembling the equipment for repair.
Working on the equipment that is connected to the power supply may cause an
electrical shock.
If it is necessary to supply power to the equipment to conduct the repair or
inspecting the circuits, do not touch any electrically charged sections of the
equipment.
If the refrigerant gas is discharged during the repair work, do not touch the
discharged refrigerant gas.
The refrigerant gas may cause frostbite.
When disconnecting the suction or discharge pipe of the compressor at the
welded section, evacuate the refrigerant gas completely at a well-ventilated
place first.
If there is gas remaining inside the compressor, the refrigerant gas or
refrigerating machine oil discharges when the pipe is disconnected, and it may
cause injury.
If the refrigerant gas leaks during the repair work, ventilate the area. The
refrigerant gas may generate toxic gases when it contacts flames.
The step-up capacitor supplies high-voltage electricity to the electrical
components of the outdoor unit.
Be sure to discharge the capacitor completely before conducting repair work.
A charged capacitor may cause an electrical shock.
Do not start or stop the air conditioner operation by plugging or unplugging the
power cable plug.
Plugging or unplugging the power cable plug to operate the equipment may
cause an electrical shock or fire.
v
SiBE041134
Introduction
Warning
Be sure to wear a safety helmet, gloves, and a safety belt when working at a
high place (more than 2 m). Insufficient safety measures may cause a fall
accident.
In case of R-410A refrigerant models, be sure to use pipes, flare nuts and tools
for the exclusive use of the R-410A refrigerant.
The use of materials for R-22 refrigerant models may cause a serious accident
such as a damage of refrigerant cycle as well as an equipment failure.
Caution
Do not repair the electrical components with wet hands.
Working on the equipment with wet hands may cause an electrical shock.
Do not clean the air conditioner by splashing water.
Washing the unit with water may cause an electrical shock.
Be sure to provide the grounding when repairing the equipment in a humid or
wet place, to avoid electrical shocks.
Be sure to turn off the power switch and unplug the power cable when cleaning
the equipment.
The internal fan rotates at a high speed, and may cause injury.
Be sure to conduct repair work with appropriate tools.
The use of inappropriate tools may cause injury.
Be sure to check that the refrigerating cycle section has cooled down enough
before conducting repair work.
Working on the unit when the refrigerating cycle section is hot may cause
burns.
Use the welder in a well-ventilated place.
Using the welder in an enclosed room may cause oxygen deficiency.
vi
Introduction
SiBE041134
1.1.2 Cautions Regarding Safety of Users
Warning
Be sure to use parts listed in the service parts list of the applicable model and
appropriate tools to conduct repair work. Never attempt to modify the
equipment.
The use of inappropriate parts or tools may cause an electrical shock,
excessive heat generation or fire.
If the power cable and lead wires have scratches or deteriorated, be sure to
replace them.
Damaged cable and wires may cause an electrical shock, excessive heat
generation or fire.
Do not use a joined power cable or extension cable, or share the same power
outlet with other electrical appliances, since it may cause an electrical shock,
excessive heat generation or fire.
Be sure to use an exclusive power circuit for the equipment, and follow the local
technical standards related to the electrical equipment, the internal wiring
regulations, and the instruction manual for installation when conducting
electrical work.
Insufficient power circuit capacity and improper electrical work may cause an
electrical shock or fire.
Be sure to use the specified cable for wiring between the indoor and outdoor
units. Make the connections securely and route the cable properly so that there
is no force pulling the cable at the connection terminals.
Improper connections may cause excessive heat generation or fire.
When wiring between the indoor and outdoor units, make sure that the terminal
cover does not lift off or dismount because of the cable.
If the cover is not mounted properly, the terminal connection section may cause
an electrical shock, excessive heat generation or fire.
Do not damage or modify the power cable.
Damaged or modified power cable may cause an electrical shock or fire.
Placing heavy items on the power cable, and heating or pulling the power cable
may damage the cable.
Do not mix air or gas other than the specified refrigerant (R-410A / R-22) in the
refrigerant system.
If air enters the refrigerating system, an excessively high pressure results,
causing equipment damage and injury.
If the refrigerant gas leaks, be sure to locate the leaking point and repair it
before charging the refrigerant. After charging refrigerant, make sure that there
is no refrigerant leak.
If the leaking point cannot be located and the repair work must be stopped, be
sure to perform pump-down and close the service valve, to prevent the
refrigerant gas from leaking into the room. The refrigerant gas itself is
harmless, but it may generate toxic gases when it contacts flames, such as fan
and other heaters, stoves and ranges.
When relocating the equipment, make sure that the new installation site has
sufficient strength to withstand the weight of the equipment.
If the installation site does not have sufficient strength and if the installation
work is not conducted securely, the equipment may fall and cause injury.
vii
SiBE041134
Introduction
Warning
Check to make sure that the power cable plug is not dirty or loose, then insert
the plug into a power outlet securely.
If the plug has dust or loose connection, it may cause an electrical shock or fire.
Be sure to install the product correctly by using the provided standard
For unitary type
installation frame.
only
Incorrect use of the installation frame and improper installation may cause the
equipment to fall, resulting in injury.
Be sure to install the product securely in the installation frame mounted on the For unitary type
window frame.
only
If the unit is not securely mounted, it may fall and cause injury.
When replacing the coin battery in the remote controller, be sure to dispose of
the old battery to prevent children from swallowing it.
If a child swallows the coin battery, see a doctor immediately.
Caution
Installation of a leakage breaker is necessary in some cases depending on the
conditions of the installation site, to prevent electrical shocks.
Do not install the equipment in a place where there is a possibility of
combustible gas leaks.
If the combustible gas leaks and remains around the unit, it may cause a fire.
Check to see if the parts and wires are mounted and connected properly, and
if the connections at the soldered or crimped terminals are secure.
Improper installation and connections may cause excessive heat generation,
fire or an electrical shock.
If the installation platform or frame has corroded, replace it.
Corroded installation platform or frame may cause the unit to fall, resulting in
injury.
Check the grounding, and repair it if the equipment is not properly grounded.
Improper grounding may cause an electrical shock.
viii
Introduction
SiBE041134
Caution
Be sure to measure the insulation resistance after the repair, and make sure
that the resistance is 1 MΩ or higher.
Faulty insulation may cause an electrical shock.
Be sure to check the drainage of the indoor unit after the repair.
Faulty drainage may cause the water to enter the room and wet the furniture
and floor.
Do not tilt the unit when removing it.
The water inside the unit may spill and wet the furniture and floor.
Be sure to install the packing and seal on the installation frame properly.
For unitary type
If the packing and seal are not installed properly, water may enter the room and only
wet the furniture and floor.
1.2
Used Icons
Icons are used to attract the attention of the reader to specific information. The meaning of each
icon is described in the table below:
Icon
Type of
Information
Note
Description
Caution
A “caution” is used when there is danger that the reader, through
incorrect manipulation, may damage equipment, loose data, get
an unexpected result or has to restart (part of) a procedure.
Warning
A “warning” is used when there is danger of personal injury.
Reference
A “reference” guides the reader to other places in this binder or
in this manual, where he/she will find additional information on a
specific topic.
A “note” provides information that is not indispensable, but may
nevertheless be valuable to the reader, such as tips and tricks.
Note:
Caution
Warning
ix
SiBE041134
Part 1
List of Functions
1. Functions.................................................................................................2
List of Functions
1
Functions
SiBE041134
Basic
Function
Functions
Inverter (with Inverter Power Control)
Operation Limit for Cooling (°CDB)
Operation Limit for Heating (°CWB)
Compressor
Comfortable
Airflow
Comfort
Control
Operation
Lifestyle
Convenience
Health &
Clean
–15
~ 18
Functions
Air-Purifying Filter
—
Photocatalytic Deodorizing Filter
—
Air-Purifying Filter with Photocatalytic
Deodorizing Function
—
PAM Control
z
Standby Electricity Saving
z
Titanium Apatite Photocatalytic
Air-Purifying Filter
z
Oval Scroll Compressor
—
Air Filter (Prefilter)
z
Swing Compressor
z
Wipe-Clean Flat Panel
z
Rotary Compressor
—
Washable Grille
—
Reluctance DC Motor
z
MOLD PROOF Operation
—
Power-Airflow Flap
z
Good-Sleep Cooling Operation
—
Power-Airflow Dual Flaps
—
WEEKLY TIMER Operation
z
Power-Airflow Diffuser
—
24-Hour ON/OFF TIMER
z
Wide-Angle Louvers
z
NIGHT SET Mode
z
Vertical Auto-Swing (Up and Down)
z
Horizontal Auto-Swing (Right and Left)
—
3-D Airflow
Timer
Auto-Restart (after Power Failure)
z
Self-Diagnosis (Digital, LED) Display
z
—
Wiring Error Check Function
—
COMFORT AIRFLOW Operation
z
Anti-Corrosion Treatment of Outdoor Heat
Exchanger
z
Auto Fan Speed
z
Multi-Split / Split Type Compatible Indoor Unit
z
—
Worry Free
“Reliability &
Durability”
Flexibility
Indoor Unit Quiet Operation
z
H/P, C/O Compatible Indoor Unit
NIGHT QUIET Mode (Automatic)
—
Flexible Power Supply Correspondence
OUTDOOR UNIT QUIET Operation (Manual)
z
Chargeless
2-Area INTELLIGENT EYE Operation
—
Either Side Drain (Right or Left)
z
INTELLIGENT EYE Operation
z
Power Selection
—
Quick Warming Function (Preheating
Operation)
z
5-Room Centralized Controller (Option)
z
Hot-Start Function
z
Remote Control Adaptor
(Normal Open Pulse Contact) (Option)
z
Automatic Defrosting
z
Automatic Operation
z
Remote Control Adaptor
(Normal Open Contact) (Option)
z
Remote
Control
—
10 m
Program Dry Operation
z
DIII-NET Compatible (Adaptor) (Option)
z
Fan Only
z
Wireless
z
New POWERFUL Operation
(Non-Inverter)
—
Wired (Option)
z
Inverter POWERFUL Operation
z
Priority-Room Setting
—
COOL / HEAT Mode Lock
—
HOME LEAVE Operation
—
ECONO Operation
z
Indoor Unit ON/OFF Button
z
Signal Receiving Sign
z
R/C with Back Light
z
Temperature Display
—
Note: z : Holding Functions
— : No Functions
2
z
–10
~ 46
Category
FTXS20/25K2V1B
RXS20/25K2V1B
Category
FTXS20/25K2V1B
RXS20/25K2V1B
1. Functions
Remote
Controller
: Lower limit can be extended to –15°C by cutting
jumper. (facility use only)
List of Functions
SiBE041134
Part 2
Specifications
1. Specifications ..........................................................................................4
Specifications
3
Specifications
SiBE041134
1. Specifications
50 Hz, 220 - 230 - 240 V
Indoor Unit
Model
FTXS20K2V1B
RXS20K2V1B
Outdoor Unit
Capacity
Rated (Min. ~ Max.)
Running Current (Rated)
Power Consumption
Rated (Min. ~ Max.)
Power Factor
COP (Rated)
Liquid
Piping
Connections Gas
Drain
Heat Insulation
Max. lnterunit Piping Length
Max. lnterunit Height Difference
Chargeless
Amount of Additional Charge of
Refrigerant
Indoor Unit
Front Panel Color
H
M
Airflow Rate
L
SL
Type
Fan
Motor Output
Speed
Air Direction Control
Air Filter
Running Current (Rated)
Power Consumption (Rated)
Power Factor
Temperature Control
Dimensions (H × W × D)
Packaged Dimensions (H × W × D)
Weight (Mass)
Gross Weight (Gross Mass)
Sound Pressure Level (H / M / L / SL)
Sound Power Level (H)
Outdoor Unit
Casing Color
Type
Compressor
Model
Motor Output
Type
Refrigerant
Oil
Charge
Type
Refrigerant
Charge
H
Airflow Rate
SL
Type
Fan
Motor Output
Running Current (Rated)
Power Consumption (Rated)
Power Factor
Starting Current
Dimensions (H × W × D)
Packaged Dimensions (H × W × D)
Weight (Mass)
Gross Weight (Gross Mass)
Sound Pressure Level (H / SL)
Sound Power Level (H)
Drawing No.
Note:
Cooling
2.0 (1.3 ~ 2.8)
6,800 (4,400 ~ 9,600)
2.4 - 2.3 - 2.2
Heating
2.5 (1.3 ~ 4.3)
8,500 (4,400 ~ 14,700)
2.8 - 2.7 - 2.6
Cooling
2.5 (1.3 ~ 3.2)
8,500 (4,400 ~ 10,900)
3.2 - 3.1 - 3.0
Heating
2.8 (1.3 ~ 4.7)
9,600 (4,400 ~ 16,000)
3.3 - 3.2 - 3.1
W
430 (320 ~ 760)
550 (310 ~ 1,120)
570 (320 ~ 1,000)
620 (310 ~ 1,410)
%
W/W
mm
mm
mm
81.4 - 81.3 - 81.4
4.65 (4.06 ~ 3.68)
89.3 - 88.6 - 88.1
4.55 (4.19 ~ 3.84)
81.0 - 79.9 - 79.2
4.39 (4.06 ~ 3.20)
85.4 - 84.2 - 83.3
4.52 (4.19 ~ 3.33)
kW
Btu/h
A
φ 6.4
φ 9.5
φ 18.0
Both Liquid and Gas Pipes
20
15
10
m
m
m
g/m
m³/min
(cfm)
W
Steps
A
W
%
mm
mm
kg
kg
dB(A)
dB
W
L
kg
m³/min
(cfm)
W
A
W
%
A
mm
mm
kg
kg
dB(A)
dB
8.8 (311)
6.7 (237)
4.7 (166)
3.9 (138)
φ 6.4
φ 9.5
φ 18.0
Both Liquid and Gas Pipes
20
15
10
20
20
FTXS20K2V1B
White
FTXS25K2V1B
White
9.5 (335)
7.8 (275)
6.0 (212)
4.3 (152)
9.1 (321)
7.0 (247)
5.0 (177)
3.9 (138)
Cross Flow Fan
16
5 Steps, Quiet, Auto
Right, Left, Horizontal, Downward
Removable / Washable / Mildew Proof
0.19 - 0.18 - 0.17
0.19 - 0.18 - 0.17
40
40
95.7- 96.6 - 98.0
95.7- 96.6 - 98.0
Microcomputer Control
289 × 780 × 215
274 × 850 × 346
8
12
40 / 32 / 24 / 19
40 / 34 / 27 / 19
56
56
RXS20K2V1B
Ivory White
Hermetically Sealed Swing Type
1YC23AEXD
600
FVC50K
0.375
R-410A
1.0
33.5 (1,183)
28.3 (999)
30.1 (1,063)
25.6 (904)
Propeller
23
2.21 - 2.12 - 2.03
2.61 - 2.52 - 2.43
390
510
80.2 - 80.0 - 80.0
88.8 - 88.0 - 87.4
2.8
550 × 765 × 285
612 × 906 × 364
34
38
46 / 43
47 / 44
61
62
3D074533
Heating
Indoor ; 20°CDB
Outdoor ; 7°CDB / 6°CWB
10.0 (353)
8.0 (282)
6.0 (212)
4.3 (152)
Cross Flow Fan
16
5 Steps, Quiet, Auto
Right, Left, Horizontal, Downward
Removable / Washable / Mildew Proof
0.19 - 0.18 - 0.17
0.19 - 0.18 - 0.17
40
40
95.7 - 96.6 - 98.0
95.7 - 96.6 - 98.0
Microcomputer Control
289 × 780 × 215
274 × 850 × 346
8
12
41 / 33 / 25 / 19
41 / 34 / 27 / 19
57
57
RXS25K2V1B
Ivory White
Hermetically Sealed Swing Type
1YC23AEXD
600
FVC50K
0.375
R-410A
1.0
33.5 (1,183)
28.3 (999)
30.1 (1,063)
25.6 (904)
Propeller
23
3.01 - 2.92 - 2.83
3.11 - 3.02 - 2.93
530
580
80.0 - 78.9 - 78.0
84.8 - 83.5 - 82.5
3.3
550 × 765 × 285
612 × 906 × 364
34
38
46 / 43
47 / 44
61
62
3D074534
„ The data are based on the conditions shown in the table below.
Cooling
Indoor ; 27°CDB / 19°CWB
Outdoor ; 35°CDB / 24°CWB
4
FTXS25K2V1B
RXS25K2V1B
Conversion Formulae
Piping Length
5m
kcal/h = kW × 860
Btu/h = kW × 3412
cfm = m³/min × 35.3
Specifications
SiBE041134
Part 3
Printed Circuit Board
Connector Wiring Diagram
1. Indoor Unit...............................................................................................6
2. Outdoor Unit............................................................................................8
Printed Circuit Board Connector Wiring Diagram
5
Indoor Unit
SiBE041134
1. Indoor Unit
Connectors and
Other Parts
PCB(1): Control PCB
1) S6
2) S25
3) S26
4) S32
5) S200
6) S403
7) FG1, FG2
8) H1, H2, H3
9) V1
10)JA
11)JB
JC
12)LED A
13)FU1 (F1U)
Connector for swing motor (horizontal blade)
Connector for INTELLIGENT EYE sensor PCB
Connector for display PCB
Connector for indoor heat exchanger thermistor
Connector for fan motor
Connector for adaptor PCB (option)
Connector for terminal board (frame ground)
Connector for terminal board (indoor - outdoor transmission)
Varistor
Address setting jumper
∗ Refer to page 167 for detail.
Fan speed setting when compressor stops for thermostat OFF
Power failure recovery function (auto-restart)
∗ Refer to page 169 for detail.
LED for service monitor (green)
Fuse (3.15 A, 250 V)
PCB (2): Display PCB
1) S27
2) SW1 (S1W)
3)
4)
5)
6)
LED1 (H1P)
LED2 (H2P)
LED3 (H3P)
RTH1 (R1T)
Connector for control PCB
Forced cooling operation [ON/OFF] button
∗ Refer to page 165 for detail.
LED for operation (green)
LED for timer (yellow)
LED for INTELLIGENT EYE (green)
Room temperature thermistor
PCB (3): INTELLIGENT EYE Sensor PCB
1) S36
6
Connector for control PCB
Printed Circuit Board Connector Wiring Diagram
SiBE041134
PCB Detail
Indoor Unit
PCB(1): Control PCB
S32
S26
S6
JA JC JB
LED A
S25
S200
S403
FU1
V1
H1
FG1, FG2
H3
H2
2P297453-1
PCB(2): Display PCB
S27
SW1 LED3
LED2 LED1
(Solder side)
RTH1
3P185701-3
PCB(3): INTELLIGENT EYE Sensor PCB
S36
3P296737-1
Printed Circuit Board Connector Wiring Diagram
7
Outdoor Unit
SiBE041134
2. Outdoor Unit
Connectors and
Other Parts
PCB (1): Filter PCB
1)
2)
3)
4)
5)
6)
7)
8)
S11
AC1, AC2, S
E1, E2
HL2, HN2
HR1
FU1
FU3
V2, V3
Connector for main PCB
Connector for terminal board
Terminal for ground wire
Connector for main PCB
Connector for reactor
Fuse (3.15 A, 250 V)
Fuse (20 A, 250 V)
Varistor
PCB (2): Main PCB
1)
2)
3)
4)
5)
6)
7)
S10
S20
S40
S50
S70
S80
S90
8) S100
9) HL3, HN3
10)HR2
11)U, V, W
12)FU2
13)LED A
14)V1
15)J4
16)J5
Connector for filter PCB
Connector for electronic expansion valve coil
Connector for overload protector
Connector for magnetic relay
Connector for fan motor
Connector for four way valve coil
Connector for thermistors
(outdoor temperature, outdoor heat exchanger, discharge pipe)
Connector for forced operation button PCB
Connector for filter PCB
Connector for reactor
Connector for compressor
Fuse (3.15 A, 250 V)
LED for service monitor (green)
Varistor
Jumper for facility setting
∗ Refer to page 168 for detail.
Jumper for improvement of defrost performance
∗ Refer to page 169 for detail.
PCB (3): Forced Operation Button PCB
1) S110
2) SW1
8
Connector for main PCB
Forced cooling operation [ON/OFF] button
∗ Refer to page 165 for detail.
Printed Circuit Board Connector Wiring Diagram
SiBE041134
PCB Detail
Outdoor Unit
PCB (1): Filter PCB
HR1
E1, E2
HN2
V2
AC2
AC1
V3
S11
FU3
S
FU1
HL2
S50
(on main PCB)
3P254234-1
PCB (2): Main PCB
U VW
S10
J5
J4 S90
LED A
S70
S40
HR2
S20
S80
HL3
V1
HN3
FU2
S100 S50
2P254206-1
PCB (3): Forced Operation Button PCB
SW1
S110
3P255755-1
Printed Circuit Board Connector Wiring Diagram
9
SiBE041134
Part 4
Function and Control
1. Main Functions......................................................................................11
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
1.11
1.12
Temperature Control ..............................................................................11
Frequency Principle................................................................................11
Airflow Direction Control.........................................................................13
Fan Speed Control for Indoor Unit .........................................................14
Program Dry Operation ..........................................................................15
Automatic Operation...............................................................................16
Thermostat Control.................................................................................17
NIGHT SET Mode ..................................................................................18
ECONO Operation .................................................................................19
INTELLIGENT EYE Operation ...............................................................20
Inverter POWERFUL Operation .............................................................21
Other Functions......................................................................................22
2. Function of Thermistor ..........................................................................23
3. Control Specification .............................................................................24
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
10
Mode Hierarchy ......................................................................................24
Frequency Control..................................................................................25
Controls at Mode Changing / Start-up....................................................27
Discharge Pipe Temperature Control.....................................................28
Input Current Control..............................................................................29
Freeze-up Protection Control .................................................................30
Heating Peak-cut Control .......................................................................30
Outdoor Fan Control...............................................................................31
Liquid Compression Protection Function................................................31
Defrost Control .......................................................................................32
Electronic Expansion Valve Control .......................................................33
Malfunctions ...........................................................................................36
Function and Control
SiBE041134
Main Functions
1. Main Functions
1.1
Temperature Control
Definitions of
Temperatures
The definitions of temperatures are classified as following.
Š
Š
Š
Š
Room temperature: temperature of lower part of the room
Set temperature: temperature set by remote controller
Room thermistor temperature: temperature detected by room temperature thermistor
Target temperature: temperature determined by microcomputer
Target temperature
Room thermistor temperature
Set temperature
Room temperature
(R12321)
Temperature
Control
1.2
The temperature of the room is detected by the room temperature thermistor. However, there is
a difference between the “temperature detected by room temperature thermistor” and the
“temperature of lower part of the room”, depending on the type of the indoor unit or installation
condition. Practically, the temperature control is done by the “target temperature appropriately
adjusted for the indoor unit” and the “temperature detected by room temperature thermistor”.
Frequency Principle
Main Control
Parameters
The compressor is frequency-controlled during normal operation. The target frequency is set by
the following 2 parameters coming from the operating indoor unit:
„ The load condition of the operating indoor unit
„ The difference between the room thermistor temperature and the target temperature
Additional
Control
Parameters
The target frequency is adapted by additional parameters in the following cases:
„ Frequency restrictions
„ Initial settings
„ Forced cooling operation
Inverter Principle
To regulate the capacity, a frequency control is needed. The inverter makes it possible to alter
the rotation speed of the compressor. The following table explains the conversion principle:
Phase
1
2
Function and Control
Description
The supplied AC power source is converted into the DC power source for the present.
The DC power source is reconverted into the three phase AC power source with variable
frequency.
„ When the frequency increases, the rotation speed of the compressor increases resulting
in an increased refrigerant circulation. This leads to a higher amount of the heat
exchange per unit.
„ When the frequency decreases, the rotation speed of the compressor decreases
resulting in a decreased refrigerant circulation. This leads to a lower amount of the heat
exchange per unit.
11
Main Functions
Drawing of
Inverter
SiBE041134
The following drawing shows a schematic view of the inverter principle:
Refrigerant circulation rate (high)
AC
power
Amount of heat
exchanged air (small)
DC
power
high speed
Amount of heat
exchanged air (large)
high f
low f
low speed
50 Hz
freq=
constant 60 Hz freq=variable
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
capacity=
variable
Refrigerant circulation rate (low)
(R2812)
Inverter Features
The inverter provides the following features:
„ The regulating capacity can be changed according to the changes in the outdoor
temperature and cooling / heating load.
„ Quick heating and quick cooling
The compressor rotational speed is increased when starting the heating (or cooling). This
enables to reach the set temperature quickly.
„ Even during extreme cold weather, high capacity is achieved. It is maintained even when the
outdoor temperature is 2°C.
„ Comfortable air conditioning
A fine adjustment is integrated to keep the room temperature constant.
„ Energy saving heating and cooling
Once the set temperature is reached, the energy saving operation enables to maintain the
room temperature at low power.
Frequency Limits
The following functions regulate the minimum and maximum frequency:
Frequency
Low
High
Forced Cooling
Operation
12
Functions
„
„
„
„
„
„
„
Four way valve operation compensation. Refer to page 27.
Compressor protection function. Refer to page 28.
Discharge pipe temperature control. Refer to page 28.
Input current control. Refer to page 29.
Freeze-up protection control. Refer to page 30.
Heating peak-cut control. Refer to page 30.
Defrost control. Refer to page 32.
Refer to page 165 for detail.
Function and Control
SiBE041134
1.3
Main Functions
Airflow Direction Control
Power-Airflow
Dual Flap
The large flap sends a large volume of air downward to the floor and provides an optimum
control in cooling, dry, and heating operation.
<Cooling / Dry>
During cooling or dry operation, the flap retracts into the indoor unit. Then, cool air can be blown
far and distributed all over the room.
<Heating>
During heating operation, the large flap directs airflow downward to spread the warm air to the
entire room.
Wide-Angle
Louvers
The louvers, made of elastic synthetic resin, provide a wide range of airflow that guarantees
comfortable air distribution.
Auto-Swing
The following table explains the auto swing process for cooling, dry, fan, and heating:
Vertical Swing (up and down)
Cooling / Dry / Fan
5˚
15˚
45˚
COMFORT
AIRFLOW
Operation
Heating
(R11256)
45˚
(R11257)
The vertical swing flap is controlled not to blow the air directly at the people in the room.
Cooling
Heating
0˚
(R11259)
Function and Control
50˚
(R11258)
13
Main Functions
1.4
SiBE041134
Fan Speed Control for Indoor Unit
Outline
Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH.
The airflow rate can be automatically controlled depending on the difference between the room
thermistor temperature and the target temperature. This is done through phase control and Hall
IC control.
For more information about Hall IC, refer to the troubleshooting for fan motor on page 70.
Automatic Fan
Speed Control
In automatic fan speed operation, the step “SL” is not available.
Step
Cooling
Heating
LLL
LL
L
ML
M
MH
H
HH (POWERFUL)
(R6834)
(R11681)
= The airflow rate is automatically controlled within this range when the [FAN] setting
button is set to automatic.
<Cooling>
The following drawing explains the principle of fan speed control for cooling.
Room thermistor temperature – target temperature
Fan speed
MH*
+2.5°C
M
+1.5°C
ML
+0.5°C
L
+3°C
+2°C
+1°C
(R14588)
*In automatic fan speed operation, the upper limit is at M tap in 30 minutes from the operation
start.
<Heating>
In heating operation, the fan speed is regulated according to the indoor heat exchanger
temperature and the difference between the room thermistor temperature and the target
temperature.
Note:
COMFORT
AIRFLOW
Operation
14
1. During POWERFUL operation, the fan rotates at H tap + 80 rpm.
2. The fan stops during defrost operation.
„ The fan speed is controlled automatically.
„ The latest command has the priority between POWERFUL and COMFORT AIRFLOW.
Function and Control
SiBE041134
1.5
Main Functions
Program Dry Operation
Outline
Program dry operation removes humidity while preventing the room temperature from lowering.
Since the microcomputer controls both the temperature and airflow rate, the temperature
adjustment and [FAN] setting buttons are inoperable.
Detail
The microcomputer automatically sets the temperature and airflow rate. The difference between
the room thermistor temperature at start-up and the target temperature is divided into two
zones. Then, the unit operates in an appropriate capacity for each zone to maintain the
temperature and humidity at a comfortable level.
Room thermistor
temperature at start-up
Target temperature
X
Thermostat OFF point
Y
Thermostat ON point
Z
X – 2.5ºC
X – 0.5ºC
or
Y + 0.5ºC (zone B)
continues for 10 min.
X – 2.0ºC
X – 0.5ºC
or
Y + 0.5ºC (zone B)
continues for 10 min.
X – 2.0ºC
X – 0.5ºC = 17.5ºC
or
Y + 0.5ºC (zone B)
continues for 10 min.
24ºC or more
Room thermistor
temperature at start-up
23.5ºC
~
18ºC
17.5ºC
18ºC
~
X
Zone C = Thermostat ON
Zone B
Z
Zone B
Y
+0.5ºC
Zone A = Thermostat OFF
(R11581)
Function and Control
15
Main Functions
1.6
Outline
Detail
SiBE041134
Automatic Operation
Automatic Cooling / Heating Function
When the automatic operation is selected with the remote controller, the microcomputer
automatically determines the operation mode as cooling or heating according to the room
temperature and the set temperature at start-up.
The unit automatically switches the operation mode to maintain the room temperature at the set
temperature.
Ts: set temperature (set by remote controller)
Tt: target temperature (determined by microcomputer)
Tr: room thermistor temperature (detected by room temperature thermistor)
C: correction value
1. The set temperature (Ts) determines the target temperature (Tt).
(Ts = 18 ~ 30°C).
2. The target temperature (Tt) is calculated as;
Tt = Ts + C
where C is the correction value.
C = 0°C
3. Thermostat ON/OFF point and operation mode switching point are as follows.
Tr means the room thermistor temperature.
(1) Heating → Cooling switching point:
Tr ≥ Tt + 2.5°C
(2) Cooling → Heating switching point:
Tr < Tt – 2.5°C
(3) Thermostat ON/OFF point is the same as the ON/OFF point of cooling or heating
operation.
4. During initial operation
Tr ≥ Ts : Cooling operation
Tr < Ts : Heating operation
Cooling Operation
Target temperature + 2.5˚C
Target temperature – 2.0˚C
= Thermostat OFF
Target temperature + 1.5˚C
= Thermostat OFF
Target temperature – 2.5˚C
Heating Operation
(R11893)
Ex: When the target temperature is 25°C
Cooling → 23°C: Thermostat OFF → 22°C: Switch to heating
Heating → 26.5°C: Thermostat OFF → 27.5°C: Switch to cooling
16
Function and Control
SiBE041134
1.7
Main Functions
Thermostat Control
Thermostat control is based on the difference between the room thermistor temperature and the
target temperature.
Thermostat OFF Condition
Š The temperature difference is in the zone A.
Thermostat ON Condition
Š The temperature difference returns to the zone C after being in the zone A.
Š The system resumes from defrost control in any zones except A.
Š The operation turns on in any zones except A.
Š The monitoring time has passed while the temperature difference is in the zone B.
(Cooling / Dry: 10 minutes, Heating: 10 seconds)
<Cooling / Dry>
ON
Room thermistor temperature – target temperature
Cooling : –0.5˚C
Dry : –0.5˚C
C
–1.5˚C
B
Cooling : –2.0˚C
Dry : –2.5 ~ –2.0˚C
A
OFF
(R12319)
<Heating>
Room thermistor temperature – target temperature
OFF
A
1.5˚C
B
1.0˚C
C
0˚C
ON
(R12320)
Refer to “Temperature Control” on page 11 for detail.
Function and Control
17
Main Functions
1.8
SiBE041134
NIGHT SET Mode
Outline
When the OFF TIMER is set, the NIGHT SET Mode is automatically activated. The NIGHT SET
Mode keeps the airflow rate setting.
Detail
The NIGHT SET Mode continues operation at the target temperature for the first one hour, then
automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in
the case of heating. This prevents excessive cooling in summer and excessive heating in winter
to ensure comfortable sleeping conditions, and also conserves electricity.
<Cooling>
0.5˚C
Target temperature
Operation stops
at the set hours
1 hour
TIMER operation
NIGHT SET Mode ON
+0.5˚C
temperature shift
(R10870)
<Heating>
Target temperature
2˚C
TIMER operation
NIGHT SET Mode ON
18
1 hour later
(R11813)
Function and Control
SiBE041134
1.9
Main Functions
ECONO Operation
Outline
ECONO operation reduces the maximum operating current and the power consumption.
This operation is particularly convenient for energy-saving-oriented users. It is also a major
bonus for those whose breaker capacities do not allow the use of multiple electrical devices and
air conditioners.
It is easily activated from the wireless remote controller by pushing the [ECONO] button.
„ When this function is activated, the maximum capacity also decreases.
„ The remote controller can send the ECONO command when the unit is in COOL, HEAT,
DRY, or AUTO operation. This function can only be set when the unit is running. Pressing
the [ON/OFF] button on the remote controller cancels the function.
„ This function and POWERFUL operation cannot be used at the same time. The latest
command has the priority.
Maximum during normal operation
Power
consumption
and current
Normal
Maximum during ECONO operation
ECONO Operation
Time
(R9288)
Function and Control
19
Main Functions
SiBE041134
1.10 INTELLIGENT EYE Operation
Outline
This function detects the existence of humans in the room with a motion sensor (INTELLIGENT
EYE) and reduces the capacity when there is nobody in the room in order to save electricity.
Detail
1. Detection method by INTELLIGENT EYE
sampling (20 msec.)
Sensor output
If the sensor detects the outputs
10 times/sec. or more, it judges
humans exist.
1 sec.
High
Low
(Human motion)
Human detection ON
signal
OFF
(R2821)
„ The sensor detects human motion by receiving infrared rays and displays the pulse wave
output.
„ The microcomputer in the indoor unit carries out a sampling every 20 msec. and if it detects
10 cycles of the wave in 1 second in total (corresponding to 20 msec. × 10 = 200 msec.), it
judges humans are in the room as the motion signal is ON.
2. The motions (for example: in cooling)
within 20 min.
Human detection
signal
ON
OFF
20 min.
20 min.
RESET.
Target temperature
Remote controller
[INTELLIGENT
EYE] button
ON
OFF
Operation
ON
OFF
Set speed
Set speed
Fan speed (+)
OFF
(R10723)
„ When the microcomputer does not have a signal from the sensor in 20 minutes, it judges
that nobody is in the room and operates the unit at a temperature shifted from the target
temperature. (Cooling / Dry: 1 ~ 2°C higher, Heating: 2°C lower, Auto: according to the
operation mode at that time.)
In FAN operation, the fan speed is reduced by 60 rpm.
Others
20
„ For dry operation, you cannot set the temperature with a remote controller, but the target
temperature is shifted internally.
Function and Control
SiBE041134
Main Functions
1.11 Inverter POWERFUL Operation
Outline
In order to exploit the cooling and heating capacity to full extent, operate the air conditioner by
increasing the indoor fan rotating speed and the compressor frequency.
Detail
When the [POWERFUL] button is pressed, the fan speed and target temperature are converted
to the following states for 20 minutes.
Operation mode
COOL
Fan speed
H tap + A rpm
Target temperature
18°C
DRY
HEAT
Dry rotating speed + A rpm
H tap + A rpm
Lowered by 2.5°C
31°C
FAN
AUTO
H tap + A rpm
Same as cooling / heating in
POWERFUL operation
—
The target temperature is
kept unchanged.
A = 80 rpm
Ex: POWERFUL operation in cooling
Target temp.
It should be the lower limit of
cooling temperature.
18˚C
It counts 20 minutes. also
in the remote controller.
POWERFUL
ON
POWERFUL
OFF
Fan
A rpm
H tap
20 minutes
Ending condition: "or" in 1 to 3
1. After the lapse of 20 minutes.
2. Operation OFF
3. POWERFUL operation is OFF.
Set tap
(R13571)
Function and Control
21
Main Functions
SiBE041134
1.12 Other Functions
1.12.1 Hot-Start Function
In order to prevent the cold air blast that normally comes when heating operation is started, the
temperature of the indoor heat exchanger is detected, and the airflow is either stopped or made
very weak thereby carrying out comfortable heating of the room.
*The cold air blast is also prevented using similar control when the defrosting operation is
started or when the thermostat is turned ON.
1.12.2 Signal Receiving Sign
When the indoor unit receives a signal from the remote controller, the unit emits a signal
receiving sound.
1.12.3 Indoor Unit [ON/OFF] Button
An [ON/OFF] button is provided on the display of the unit.
„ Press the [ON/OFF] button once to start operation. Press once again to stop it.
„ The [ON/OFF] button is useful when the remote controller is missing or the battery has run
out.
„ The operation mode refers to the following table.
Operation mode
Temperature setting
Airflow rate
AUTO
25ºC
Automatic
[ON/OFF] button
<Forced cooling operation>
Forced cooling operation can be started by pressing the [ON/OFF] button for 5 to 9 seconds
while the unit is not operating.
Refer to page 165 for detail.
Note:
When the [ON/OFF] button is pressed for 10 seconds or more, the forced cooling operation is
stopped.
1.12.4 Titanium Apatite Photocatalytic Air-Purifying Filter
This filter combines the Air-Purifying Filter and Titanium Apatite Photocatalytic Deodorizing
Filter as a single highly effective filter. The filter traps microscopic particles, decomposes odors
and even deactivates bacteria and viruses. It lasts for 3 years without replacement if washed
about once every 6 months.
1.12.5 Auto-restart Function
If a power failure (including one for just a moment) occurs during the operation, the operation
restarts automatically when the power is restored in the same condition as before the power
failure.
Note:
It takes 3 minutes to restart the operation because the 3-minute standby function is activated.
1.12.6 WEEKLY TIMER Operation
Up to 4 timer settings can be saved for each day of the week (up to 28 settings in total).
Those 3 items of “ON / OFF”, “temperature” and “time” can be set.
Refer to page 53 for detail.
22
Function and Control
SiBE041134
Function of Thermistor
2. Function of Thermistor
Electronic
expansion valve
(1)
(3)
Four way valve
(2)
Compressor
(R14247)
(1) Outdoor Heat
Exchanger
Thermistor
1. The outdoor heat exchanger thermistor is used for controlling the target discharge pipe
temperature. The system sets the target discharge pipe temperature according to the
outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve
opening so that the target discharge pipe temperature can be obtained.
2. In cooling operation, the outdoor heat exchanger thermistor is used for detecting the
disconnection of the discharge pipe thermistor. When the discharge pipe temperature
becomes lower than the outdoor heat exchanger temperature, the discharge pipe thermistor
is judged as disconnected.
3. In cooling operation, the outdoor heat exchanger thermistor is used for high pressure
protection.
(2) Discharge
Pipe Thermistor
1. The discharge pipe thermistor is used for controlling discharge pipe temperature. If the
discharge pipe temperature (used in place of the inner temperature of the compressor) rises
abnormally, the operating frequency becomes lower or the operation halts.
2. The discharge pipe thermistor is used for detecting disconnection of the discharge pipe
thermistor.
(3) Indoor Heat
Exchanger
Thermistor
1. The indoor heat exchanger thermistor is used for controlling the target discharge pipe
temperature. The system sets the target discharge pipe temperature according to the
outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve
opening so that the target discharge pipe temperature can be obtained.
2. In cooling operation, the indoor heat exchanger thermistor is used for freeze-up protection
control. If the indoor heat exchanger temperature drops abnormally, the operating frequency
becomes lower or the operation halts.
3. In heating operation, the indoor heat exchanger thermistor is used for detecting the
disconnection of the discharge pipe thermistor. When the discharge pipe temperature
becomes lower than the indoor heat exchanger temperature, the discharge pipe thermistor
is judged as disconnected.
Function and Control
23
Control Specification
SiBE041134
3. Control Specification
3.1
Mode Hierarchy
Outline
There are 3 modes; normal operation mode, forced operation mode and the power transistor
test mode for installation and servicing.
Detail
Air conditioner control mode
Forced operation mode
Forced cooling operation
Power transistor test mode
Normal operation mode
Fan
Cooling (includes drying)
Heating
Heating
Defrosting
Stop (indoor unit: OFF)
Preheating operation
Discharging from capacitor
Stop
(R14248)
Note:
24
Unless specified otherwise, an indoor dry operation command is regarded as cooling operation.
Function and Control
SiBE041134
3.2
Control Specification
Frequency Control
Outline
Frequency is determined according to the difference between the room thermistor temperature
and the target temperature.
The function is explained as follows.
1. How to determine frequency
2. Frequency command from the indoor unit (Difference between the room thermistor
temperature and the target temperature)
3. Frequency initial setting
4. PI control
When the shift of the frequency is less than zero (∆F<0) by PI control,
the target frequency is used as the command frequency.
Dropping function
Input current control, etc.
Upper limit frequency
FMAX
Command frequency
Limit frequency
Initial frequency
PI control
Defrost control
Lower limit frequency
FMIN
Upper limit function
Compressor protection function
Skip control
Target frequency
Lower limit function
Four way valve operating compensation, etc.
(R14951)
Detail
How to Determine Frequency
The compressor’s frequency is determined by taking the following steps.
1. Determine command frequency
Š Command frequency is determined in the following order of priority.
1.Limiting defrost control time
2.Forced cooling
3.Indoor frequency command
2. Determine upper limit frequency
Š The minimum value is set as an upper limit frequency among the frequency upper limits of
the following functions:
Compressor protection, input current, discharge pipe temperature, heating peak-cut, freezeup protection, defrost.
3. Determine lower limit frequency
Š The maximum value is set as a lower limit frequency among the frequency lower limits of the
following functions:
Four way valve operation compensation, draft prevention, pressure difference upkeep.
4. Determine prohibited frequency
Š There is a certain prohibited frequency such as a power supply frequency.
Function and Control
25
Control Specification
SiBE041134
Indoor Frequency Command (∆D signal)
The difference between the room thermistor temperature and the target temperature is taken as
the “∆D signal” and is used for frequency command.
Temperature
difference
–2.0
∆D
signal
∗Th
OFF
Temperature
difference
0
∆D
signal
4
Temperature
difference
2.0
∆D
signal
8
Temperature
difference
4.0
∆D
signal
C
–1.5
–1.0
1
2
0.5
1.0
5
6
2.5
3.0
9
A
4.5
5.0
D
E
–0.5
3
1.5
7
3.5
B
5.5
F
∗Th OFF = Thermostat OFF
Frequency Initial Setting
<Outline>
When starting the compressor, the frequency is initialized according to the ∆D value and the Q
value of the indoor unit.
Q value: Indoor unit output determined from indoor unit volume, airflow rate and other factors.
PI Control (Determine Frequency Up / Down by ∆D Signal)
1. P control
The ∆D value is calculated in each sampling time (15 ~ 20 seconds), and the frequency is
adjusted according to its difference from the frequency previously calculated.
2. I control
If the operating frequency does not change for more than a certain fixed time, the frequency
is adjusted according to the ∆D value.
When the ∆D value is low, the frequency is lowered.
When the ∆D value is high, the frequency is increased.
3. Frequency management when other controls are functioning
Š When frequency is dropping;
Frequency management is carried out only when the frequency drops.
Š For limiting lower limit
Frequency management is carried out only when the frequency rises.
4. Upper and lower limit of frequency by PI control
The frequency upper and lower limits are set according to the command of the indoor unit.
When the indoor or outdoor unit quiet operation command comes from the indoor unit, the
upper limit frequency is lower than the usual setting.
26
Function and Control
SiBE041134
3.3
Control Specification
Controls at Mode Changing / Start-up
3.3.1 Preheating Operation
Outline
The inverter operation in open phase starts with the conditions of the preheating command from
the indoor unit, the outdoor temperature, and the discharge pipe temperature.
Detail
Outdoor temperature ≥ 7°C → Control A
Outdoor temperature < 7°C → Control B
Control A
Š ON condition
Discharge pipe temperature < 10°C
Š OFF condition
Discharge pipe temperature > 12°C
Radiation fin temperature ≥ 90°C
Control B
Š ON condition
Discharge pipe temperature < 20°C
Š OFF condition
Discharge pipe temperature > 22°C
Radiation fin temperature ≥ 90°C
3.3.2 Four Way Valve Switching
Outline
In heating operation, current is conducted, and in cooling and defrosting operation, current is
not conducted. In order to eliminate the switching sound as the four way valve coil switches
from ON to OFF when the heating is stopped, the OFF delay switch of the four way valve is
carried out.
Detail
OFF delay switch of four way valve:
The four way valve coil is energized for 160 seconds after the operation is stopped.
3.3.3 Four Way Valve Operation Compensation
Outline
At the beginning of the operation as the four way valve is switched, the pressure difference to
activate the four way valve is acquired by having output frequency which is more than a certain
fixed frequency, for a certain fixed time.
Detail
Starting Conditions
1. When starting the compressor for heating
2. When the operation mode changes from heating to cooling
3. When starting the compressor for defrosting
4. When starting the compressor for heating after defrosting
5. When starting the compressor for the first time after resetting with the power ON
6. When starting the compressor after the fault of switching over cooling / heating
The lower limit of frequency keeps A Hz for B seconds with any conditions 1 through 6 above.
A (Hz)
B (seconds)
Cooling
68
Heating
66
45
3.3.4 3-minute Standby
Turning on the compressor is prohibited for 3 minutes after turning it off.
(Except when defrosting.)
Function and Control
27
Control Specification
SiBE041134
3.3.5 Compressor Protection Function
When turning the compressor from OFF to ON, the upper limit of frequency is set as follows.
(The function is not activated when defrosting.)
(Hz)
Frequency
C
B
A
D
E
(sec.)
Time
F
(R13528)
3.4
Outline
A (Hz)
48
B (Hz)
C (Hz)
64
88
D (seconds)
E (seconds)
240
360
F (seconds)
180
Discharge Pipe Temperature Control
The discharge pipe temperature is used as the internal temperature of the compressor. If the
discharge pipe temperature rises above a certain level, the upper limit of frequency is set to
keep the discharge pipe temperature from rising further.
Detail
Stop zone
A˚C
B˚C
Dropping zone
C˚C
Keep zone
D˚C
Discharge pipe
temperature
Zone
Stop zone
28
Up zone
Reset zone
E˚C
(R14642)
Control
When the temperature reaches the stop zone, the compressor stops.
Dropping zone
Keep zone
The upper limit of frequency decreases.
The upper limit of frequency is kept.
Up zone
Reset zone
The upper limit of frequency increases.
The upper limit of frequency is canceled.
A (ºC)
110
B (ºC)
C (ºC)
105
101
D (ºC)
E (ºC)
99
97
Function and Control
SiBE041134
3.5
Control Specification
Input Current Control
Outline
The microcomputer calculates the input current while the compressor is running, and sets the
frequency upper limit from the input current.
In case of heat pump models, this control which is the upper limit control of the frequency takes
priority over the lower limit of control of four way valve operation compensation.
Detail
Compressor Stop
(A)
Stop Zone
A
Dropping Zone
B
Keep Zone
C
Input current
Reset Zone
(R14643)
Frequency control in each zone
Stop zone
Š After 2.5 seconds in this zone, the compressor is stopped.
Dropping zone
Š The upper limit of the compressor frequency is defined as operation frequency – 2 Hz.
Š After this, the output frequency is lowered by 2 Hz every second until it reaches the keep
zone.
Keep zone
Š The present maximum frequency goes on.
Reset zone
Š Limit of the frequency is canceled.
A (A)
Cooling
Heating
9.25
B (A)
C (A)
7.5
6.75
Limitation of current dropping and stop value according to the outdoor temperature
Š The current drops when outdoor temperature becomes higher than a certain level
(depending on the model).
Function and Control
29
Control Specification
3.6
SiBE041134
Freeze-up Protection Control
Outline
During cooling operation, the signal sent from the indoor unit controls the operating frequency
limitation and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is
divided into zones.)
Detail
The operating frequency limitation is judged with the indoor heat exchanger temperature.
Indoor heat exchanger
thermistor temperature
13˚C
Reset zone
A˚C
Up zone
B˚C
Keep zone
C˚C
Dropping zone
0˚C
Stop zone
(R14718)
A (°C)
11
3.7
Outline
B (°C)
9
C (°C)
7
Heating Peak-cut Control
During heating operation, the indoor heat exchanger temperature determines the frequency
upper limit to prevent abnormal high pressure.
Detail
Stop zone
A˚C
B˚C
Dropping zone
C˚C
Keep zone
D˚C
Up zone
Reset zone
Indoor heat exchanger
thermistor temperature
(R14645)
Zone
Control
Stop zone
Dropping zone
30
E˚C
When the temperature reaches the stop zone, the compressor stops.
The upper limit of frequency decreases.
Keep zone
Up zone
The upper limit of frequency is kept.
The upper limit of frequency increases.
Reset zone
The upper limit of frequency is canceled.
A (°C)
B (°C)
C (°C)
D (°C)
E (°C)
65
56
53
51
46
Function and Control
SiBE041134
3.8
Control Specification
Outdoor Fan Control
1. Fan ON control to cool down the electrical box
The outdoor fan is turned ON when the electrical box temperature is high while the compressor
is OFF.
2. Fan OFF control during defrosting
The outdoor fan is turned OFF during defrosting.
3. Fan OFF delay when stopped
The outdoor fan is turned OFF 60 seconds after the compressor stops.
4. Fan speed control for pressure difference upkeep
The rotation speed of the outdoor fan is controlled for keeping the pressure difference during
cooling operation with low outdoor temperature.
Š When the pressure difference is low, the rotation speed of the outdoor fan is reduced.
Š When the pressure difference is high, the rotation speed of the outdoor fan is controlled as
well as normal operation.
5. Fan speed control during forced cooling operation
The outdoor fan is controlled as well as normal operation during forced cooling operation.
6. Fan speed control during POWERFUL operation
The rotation speed of the outdoor fan is increased during POWERFUL operation.
7. Fan speed control during indoor / outdoor unit quiet operation
The rotation speed of the outdoor fan is reduced by the command of the indoor / outdoor unit
quiet operation.
8. Fan ON/OFF control when operation starts / stops
The outdoor fan is turned ON when the operation starts. The outdoor fan is turned OFF when
the operation stops.
3.9
Liquid Compression Protection Function
Outline
In order to obtain the dependability of the compressor, the compressor is stopped according to
the outdoor temperature and temperature of the outdoor heat exchanger.
Detail
„ Operation stops depending on the outdoor temperature.
Compressor turns off under the conditions that the system is in cooling operation and outdoor
temperature is below –12°C.
Function and Control
31
Control Specification
SiBE041134
3.10 Defrost Control
Outline
Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor
heat exchanger temperature must be more than a certain value to finish.
Detail
Conditions for Starting Defrost
„ The starting conditions are determined with the outdoor temperature and the outdoor heat
exchanger temperature.
„ The system is in heating operation.
„ The compressor operates for 6 minutes.
„ More than A minutes of accumulated time pass after the start of the operation, or ending the
previous defrosting.
Conditions for Canceling Defrost
The judgment is made with the outdoor heat exchanger temperature. (B°C)
D Hz
C Hz
PI control
Frequency
0 Hz
F sec.
E sec.
Compressor
Four way valve
G sec.
H sec.
ON
OFF
ON
OFF
5 sec.
Fan
5 sec.
ON
OFF
J pulse
Electronic expansion
valve opening
L pulse
M pulse
K pulse
Initial opening
(R16446)
A (minutes)
B (°C)
32
28
4 ~ 18
C (Hz)
D (Hz)
68
86
E (seconds)
F (seconds)
50
60
G (seconds)
H (seconds)
600
50
J (pulse)
K (pulse)
450
350
L (pulse)
M (pulse)
400
450
Function and Control
SiBE041134
Control Specification
3.11 Electronic Expansion Valve Control
During target discharge pipe temperature control
When the frequency changes under target discharge
pipe temperature control
When the disconnection of the discharge pipe
thermistor is ascertained
When the frequency changes under the control for
disconnection of the discharge pipe thermistor
Under defrost control
The followings are the examples of electronic expansion valve control which function in each
operation mode.
When the frequency changes under starting control
Detail
When the operation starts
The following items are included in the electronic expansion valve control.
Electronic expansion valve is fully closed
1. Electronic expansion valve is fully closed when turning on the power.
2. Pressure equalizing control
Open Control
1. Electronic expansion valve control when starting operation
2. Electronic expansion valve control when the frequency changes
3. Electronic expansion valve control for defrosting
4. Electronic expansion valve control when the discharge pipe temperature is abnormally high
5. Electronic expansion valve control when the discharge pipe thermistor is disconnected
Feedback Control
1. Target discharge pipe temperature control
When the power turns on or when the compressor
stops
Outline
Starting control
−
h
−
−
−
−
−
−
Control when the frequency changes
−
−
h
−
h
−
−
−
Target discharge pipe temperature control
−
−
−
h
−
−
−
−
Control for disconnection of the discharge
pipe thermistor
−
−
−
−
−
h
h
−
High discharge pipe temperature control
−
h
h
h
h
−
−
−
Pressure equalizing control
h
−
−
−
−
−
−
−
Opening limit control
−
h
h
h
h
h
h
−
Starting control
−
h
−
−
−
−
−
−
Control when the frequency changes
−
−
h
−
h
−
−
−
Target discharge pipe temperature control
−
−
−
h
−
−
−
−
Control for disconnection of the discharge
pipe thermistor
−
−
−
−
−
h
h
−
High discharge pipe temperature control
−
h
h
h
h
−
−
−
Defrost control
−
−
−
−
−
−
−
h
Pressure equalizing control
h
−
−
−
−
−
−
−
Opening limit control
−
h
h
h
h
h
h
−
h : Holding Functions
— : No Functions
Cooling
Heating
Function and Control
33
Control Specification
SiBE041134
3.11.1 Fully Closing with Power ON
The electronic expansion valve is initialized when turning on the power. The opening position is
set and the pressure equalization is developed.
3.11.2 Pressure Equalizing Control
When the compressor is stopped, the pressure equalization control is activated. The electronic
expansion valve opens, and develops the pressure equalization.
3.11.3 Opening Limit Control
Outline
Detail
A maximum and minimum opening of the electronic expansion valve are limited.
Maximum opening (pulse)
Minimum opening (pulse)
480
52
The electronic expansion valve is fully closed when cooling operation stops, and is opened at a
fixed degree during defrosting.
3.11.4 Starting Operation Control
The electronic expansion valve opening is controlled when the operation starts, and prevents
superheating or liquid compression.
3.11.5 Control when the Frequency Changes
When the target discharge pipe temperature control is active, if the target frequency is changed
to a specified value in a certain time period, the target discharge pipe temperature control is
canceled and the target opening of the electronic expansion valve is changed according to the
shift.
3.11.6 High Discharge Pipe Temperature Control
When the compressor is operating, if the discharge pipe temperature exceeds a certain value,
the electronic expansion valve opens and the refrigerant runs to the low pressure side. This
procedure lowers the discharge pipe temperature.
34
Function and Control
SiBE041134
Control Specification
3.11.7 Control for Disconnection of the Discharge Pipe Thermistor
Outline
The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe
temperature with the condensation temperature. If the discharge pipe thermistor is
disconnected, the electronic expansion valve opens according to the outdoor temperature and
the operation frequency, operates for a specified time, and then stops.
After 3 minutes, the operation restarts and checks if the discharge pipe thermistor is
disconnected. If the discharge pipe thermistor is disconnected, the system stops after operating
for a specified time.
If the disconnection is detected repeatedly, the system is shut down. When the compressor runs
for 60 minutes without any error, the error counter is reset.
Detail
When the starting control (cooling: A seconds, heating: B seconds) finishes, the detection timer
for disconnection of the discharge pipe thermistor (C seconds) starts. When the timer is over,
the following adjustment is made.
1. When the operation mode is cooling
When the following condition is fulfilled, the discharge pipe thermistor disconnection is
ascertained.
Discharge pipe temperature + 6°C < outdoor heat exchanger temperature
2. When the operation mode is heating
When the following condition is fulfilled, the discharge pipe thermistor disconnection is
ascertained.
Discharge pipe temperature + 6°C < indoor heat exchanger temperature
A (seconds)
B (seconds)
10
120
C (seconds)
810
Adjustment when the thermistor is disconnected
When the disconnection is ascertained, the compressor continues operation for 9 minutes and
then stops.
If the compressor stops repeatedly, the system is shut down.
3.11.8 Target Discharge Pipe Temperature Control
The target discharge pipe temperature is obtained from the indoor and outdoor heat exchanger
temperature, and the electronic expansion valve opening is adjusted so that the actual
discharge pipe temperature becomes close to the target discharge pipe temperature. (Indirect
SH (superheating) control using the discharge pipe temperature)
The target discharge pipe
temperature is set as to become the
aiming SH.
SC
(Subcool)
The inclination does not change
depending on the operating condition.
SH
(Superheat)
(R14213)
The electronic expansion valve opening and the target discharge pipe temperature are adjusted
every 20 seconds. The target discharge pipe temperature is controlled by indoor heat
exchanger temperature and outdoor heat exchanger temperature. The opening degree of the
electronic expansion valve is controlled by the followings.
Š Target discharge pipe temperature
Š Actual discharge pipe temperature
Š Previous discharge pipe temperature
Function and Control
35
Control Specification
SiBE041134
3.12 Malfunctions
3.12.1 Sensor Malfunction Detection
Sensor malfunction may occur in the thermistor.
Relating to Thermistor Malfunction
1. Outdoor heat exchanger thermistor
2. Discharge pipe thermistor
3. Radiation fin thermistor
4. Outdoor temperature thermistor
3.12.2 Detection of Overcurrent and Overload
Outline
An excessive output current is detected and the OL temperature is observed to protect the
compressor.
Detail
„ If the OL (compressor head) temperature exceeds 120°C, the system shuts down the
compressor.
„ If the inverter current exceeds 9.25 A, the system shuts down the compressor.
3.12.3 Refrigerant Shortage Control
Outline
I: Detecting by power consumption
If the power consumption is below the specified value and the frequency is higher than the
specified frequency, it is regarded as refrigerant shortage.
The power consumption is low comparing with that in the normal operation when refrigerant is
insufficient, and refrigerant shortage is detected by checking power consumption.
Power consumption
Refrigerant shortage zone
55 Hz
Frequency
(R11384)
II: Detecting by discharge pipe temperature
If the discharge pipe temperature is higher than the target discharge pipe temperature, and the
electronic expansion valve is fully open for more than the specified time, it is regarded as
refrigerant shortage.
Target discharge
pipe temperature
Refrigerant shortage
zone
(R1391)
III: Detecting by the difference of temperature
If the difference between suction and discharge temperature is smaller than the specified value,
it is regarded as refrigerant shortage.
Refer to page 73 for detail.
36
Function and Control
SiBE041134
Part 5
Operation Manual
1. System Configuration............................................................................38
2. Operation Manual..................................................................................39
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.11
Operation Manual
Remote Controller ..................................................................................39
AUTO · DRY · COOL · HEAT · FAN Operation ......................................41
Adjusting the Airflow Direction and Rate ................................................43
COMFORT AIRFLOW Operation ...........................................................45
INTELLIGENT EYE Operation ...............................................................46
POWERFUL Operation ..........................................................................48
OUTDOOR UNIT QUIET Operation.......................................................49
ECONO Operation .................................................................................50
OFF TIMER Operation ...........................................................................51
ON TIMER Operation .............................................................................52
WEEKLY TIMER Operation ...................................................................53
37
System Configuration
SiBE041134
1. System Configuration
After installation and trial operation of the room air conditioner are completed, the air conditioner
should be handled and operated as described in the following pages. Every user should be
informed on the correct method of operation and how to check if it can cool (or heat) well, and
how to use it efficiently.
Providing instructions to the user can reduce requests for servicing by 80%. However proficient
the installation and operating functions of the air conditioning system are, the customer may
fault either the room air conditioner or its installation work when it is actually due to improper
handling. The installation work and the handing-over of the unit can only be considered
completed when its handling has been fully explained to the user without using technical terms,
and while imparting full knowledge of the equipment.
38
Operation Manual
SiBE041134
Operation Manual
2. Operation Manual
2.1
Remote Controller
Name of Parts
Remote Controller
Signal transmitter
Receiver
Display (LCD)
• It displays the current settings.
(In this illustration, each section is
shown with its displays on for the
purpose of explanation.)
• To use the remote controller, aim the
transmitter at the indoor unit. If there
is anything to block signals between
the unit and the remote controller,
such as a curtain, the unit will not
operate.
• Do not drop the remote controller. Do
not get it wet.
• The maximum distance for
communication is approx. 7m.
TEMPERATURE
adjustment buttons
• It changes the temperature setting.
Page 12
FAN setting button
• It selects the airflow rate setting.
Page 14
ON/OFF button
• Press this button once to start
operation.
Press once again to stop it.
Page 11
POWERFUL button
• POWERFUL operation.
Page 18
Front cover
• Open the front cover.
Model
Operation Manual
Page 8
ARC466A6
39
Operation Manual
SiBE041134
„ Open the front cover
MODE selector button
• It selects the operation mode.
(AUTO/DRY/COOL/HEAT/
FAN) Page 11
ECONO button
• ECONO operation.
Page 20
SWING button
• Adjusting the airflow direction.
Page 13
QUIET button
• OUTDOOR UNIT QUIET
operation.
Page 19
INTELLIGENT EYE
button
COMFORT button
• INTELLIGENT EYE
operation.
Page 16
• COMFORT AIRFLOW
operation.
Page 15
: WEEKLY button
OFF TIMER button
Page 21
: PROGRAM button
: COPY button
TIMER CANCEL
button
• It cancels the timer setting.
Page 21,22
: BACK button
: NEXT button
• WEEKLY TIMER operation.
Page 23
• It cannot be used for the
WEEKLY TIMER operation.
ON TIMER button
Page 22
SELECT button
• It changes the ON/OFF
TIMER and WEEKLY TIMER
settings. Page 21,22,23
40
CLOCK button
Operation Manual
SiBE041134
2.2
Operation Manual
AUTO · DRY · COOL · HEAT · FAN Operation
AUTO · DRY · COOL · HEAT ·
FAN Operation
The air conditioner operates with the operation mode of your choice.
From the next time on, the air conditioner will operate with the same operation mode.
„ To start operation
1. Press
and select an operation mode.
• Each pressing of the button advances the mode setting in sequence.
AUTO
2. Press
DRY
COOL
HEAT
FAN
.
•“
” is displayed on the LCD.
• The OPERATION lamp lights green.
Display
„ To stop operation
Press
again.
• “
” disappears from the LCD.
• The OPERATION lamp goes off.
NOTE
MODE
HEAT
Notes on each operation mode
• Since this air conditioner heats the room by taking heat from outdoor air to indoors, the heating capacity becomes smaller in
lower outdoor temperatures. If the heating effect is insufficient, it is recommended to use another heating appliance in
combination with the air conditioner.
• The heat pump system heats the room by circulating hot air around all parts of the room. After the start of HEAT operation,
it takes some time before the room gets warmer.
• In HEAT operation, frost may occur on the outdoor unit and lower the heating capacity. In that case, the system switches into
defrosting operation to take away the frost.
• During defrosting operation, hot air does not flow out of indoor unit.
COOL
• This air conditioner cools the room by releasing the heat in the room outside.
Therefore, the cooling performance of the air conditioner may be degraded if the outdoor temperature is high
DRY
AUTO
FAN
Operation Manual
• The computer chip works to rid the room of humidity while maintaining the temperature as much as possible. It automatically
controls temperature and airflow rate, so manual adjustment of these functions is unavailable.
• In AUTO operation, the system selects an appropriate operation mode (COOL or HEAT) based on the room and outside
temperatures and starts the operation.
• The system automatically reselects setting at a regular interval to bring the room temperature to user-setting level.
• This mode is valid for fan only.
41
Operation Manual
SiBE041134
„ To change the temperature setting
Press
.
• The displayed items on the LCD will change whenever either one of the buttons is
pressed.
COOL operation
HEAT operation
AUTO operation
18-32˚C
10-30˚C
18-30˚C
Press
to raise the temperature and press
temperature.
to lower the
DRY or FAN operation
The temperature setting is
not variable.
„ Operating conditions
„ Recommended temperature setting
• For cooling: 26-28˚C
• For heating: 20-24˚C
„ Tips for saving energy
• Be careful not to cool (heat) the room too much.
Keeping the temperature setting at a moderate level helps save energy.
• Cover windows with a blind or a curtain.
Blocking sunlight and air from outdoors increases the cooling (heating) effect.
• Clogged air filters cause inefficient operation and waste energy. Clean them once in about every 2 weeks.
„ Notes on the operating conditions
• The outdoor unit consumes some power to have its electric components work even while it is not operating.
Connecting outdoor unit RXS20/25: 1-15W
Other outdoor units: 15-20W
The outdoor unit consumes 40 to 55W of power at the time of compressor preheating.
• If you are not going to use the air conditioner for a long period, for example in spring or autumn, turn the breaker off.
• Use the air conditioner in the following conditions.
MODE
Operating conditions
If operation is continued out of this range
• A safety device may work to stop the operation.
• Condensation may occur on the indoor unit and drip.
COOL
Outdoor temperature: <2MXS> 10-46˚C
<3/4/5MXS> –10-46˚C
<RXS> –10-46˚C
Indoor temperature: 18-32˚C
Indoor humidity: 80% max.
Outdoor temperature: <2/3/4/5MXS> –15-24˚C
<RXS> –15-24˚C
Indoor temperature: 10-30˚C
• A safety device may work to stop the operation.
HEAT
• A safety device may work to stop the operation.
• Condensation may occur on the indoor unit and drip.
DRY
Outdoor temperature: <2MXS> 10-46˚C
<3/4/5MXS> –10-46˚C
<RXS> –10-46˚C
Indoor temperature: 18-32˚C
Indoor humidity: 80% max.
• Operation outside this humidity or temperature range may cause a safety device to disable the system.
42
Operation Manual
SiBE041134
2.3
Operation Manual
Adjusting the Airflow Direction and Rate
Adjusting the Airflow Direction
and Rate
You can adjust the airflow direction to increase your comfort.
„ To start auto swing
Upper and lower airflow direction
Press
.
• “ ” is displayed on the LCD.
• The flap (horizontal blade) will begin to swing.
„ To set the flap at desired position
• This function is effective while flap is in auto swing mode.
Press
when the flap has reached the
desired position.
• “
” disappears from the LCD.
„ To adjust the louvers at desired position
Hold the knob and move the louvers.
• You will find a knob on the left-side and the right-side
blades.
• When the unit is installed in the corner of a room, the
direction of the louvers (vertical blades) should be facing
away from the wall.
If they face the wall, the wall will block off the wind,
causing the cooling (or heating) efficiency to drop.
• If the flap is in the way, press
on the remote controller to move the flap out of
the way and then adjust the louvers.
Operation Manual
43
Operation Manual
SiBE041134
„ To adjust the airflow rate setting
Press
.
• Each pressing of
advances the airflow rate setting in sequence.
Indoor unit quiet
Auto
High
Middle high
Low
Middle low
Middle
• When the airflow is set to “
”, indoor unit quiet operation will start and the noise from
the unit will become quieter.
• In indoor unit quiet operation, the airflow rate is set to a weak level.
• If the temperature does not reach the desired point in the indoor unit quiet operation,
change the airflow rate setting.
• In DRY mode, the airflow rate setting is not variable.
NOTE
„ Notes on the angles of the flap
• The flap swinging range depends on the operation. (See the figure.)
COOL and DRY
operation
HEAT operation
Stop operation
COMFORT AIRFLOW 0˚
5˚
Upper limit
45˚
Lower limit
Stop operation
0˚
15˚
Upper limit
50˚
45˚
Lower limit
FAN operation
Stop operation
Upper limit
0˚
5˚
45˚
Lower limit
COMFORT AIRFLOW
• If the air conditioner is operated in COOL or DRY operation with the flap kept stopped in the downward direction, the flap will automatically
start operating in approximately an hour in order to prevent dew condensation.
„ Note on airflow rate setting
• At smaller airflow rates, the cooling (heating) effect is also smaller.
CAUTION
• Always use a remote controller to adjust the angles of the flap. If you attempt to move the flap and louvers forcibly with hand when they are
swinging, the mechanism may be broken.
• Be careful when adjusting the louvers.
Inside the air outlet, a fan is rotating at a high speed.
44
Operation Manual
SiBE041134
2.4
Operation Manual
COMFORT AIRFLOW Operation
COMFORT AIRFLOW Operation
The flow of air will be in the upward direction while in COOL operation and in the
downward direction while in HEAT operation, which will provide a comfortable
wind that will not come in direct contact with people.
„ To start COMFORT AIRFLOW operation
Press
.
• “ ” is displayed on the LCD.
• Airflow rate is set to Auto.
COOL/DRY: The flap will go up.
HEAT: The flap will go down.
„ To cancel COMFORT AIRFLOW operation
Press
again.
• The flaps will return to the memory position from before COMFORT AIRFLOW
operation.
• “ ” disappears from the LCD.
COOL operation
HEAT operation
NOTE
„ Notes on COMFORT AIRFLOW operation
• The flap position will change, preventing air from blowing directly on the occupants of the room.
• POWERFUL operation and COMFORT AIRFLOW operation cannot be used at the same time.
Priority is given to the function of whichever button is pressed last.
• The airflow rate will be set to Auto. If the upper and lower airflow direction is selected, the COMFORT AIRFLOW operation will be canceled.
Operation Manual
45
Operation Manual
2.5
SiBE041134
INTELLIGENT EYE Operation
INTELLIGENT EYE Operation
“INTELLIGENT EYE” is the infrared sensor which detects the human movement.
If nobody in the room for more than 20 minutes, the operation automatically
changes to energy saving operation.
„ To start INTELLIGENT EYE operation
Press
.
•“
” is displayed on the LCD.
• The INTELLIGENT EYE lamp lights green.
Display
„ To cancel INTELLIGENT EYE operation
Press
again.
•“
” disappears from the LCD.
• The INTELLIGENT EYE lamp goes off.
16
46
Operation Manual
SiBE041134
Operation Manual
INTELLIGENT EYE Operation
[Example]
When someone is in the
room
When no one is in the room
„ 20 minutes after, start
energy saving operation.
„ Normal operation
• The air conditioner is in normal
operation while the sensor is
detecting the movement of people.
Someone is back in the
room
„ Back to normal operation.
• The set temperature is shifted in
±2˚C steps.
• The air conditioner will return to
normal operation when the sensor
detects the movement of people
again.
INTELLIGENT EYE operation is useful for energy saving
„ Energy saving operation
• If no presence detected in the room for 20 minutes, the energy saving operation will start.
• This operation changes the temperature –2˚C in HEAT / +2˚C in COOL / +1˚C in DRY operation from set temperature.
When the room temperature exceeds 30˚C, the operation changes the temperature +1˚C in COOL / +1˚C in DRY operation from set
temperature.
• This operation decreases the airflow rate slightly in FAN operation only.
NOTE
„ Notes on INTELLIGENT EYE operation
• Application range is as follows.
Vertical angle 90˚
(Side view)
Horizontal angle 110˚
(Top view)
90˚
7m
55˚ 55˚
7m
• Sensor may not detect moving objects further than 7m away. (Check the application range.)
• Sensor detection sensitivity changes according to indoor unit location, the speed of passersby, temperature range, etc.
• The sensor also mistakenly detects pets, sunlight, fluttering curtains and light reflected off of mirrors as passersby.
• INTELLIGENT EYE operation will not go on during POWERFUL operation.
• NIGHT SET mode
Page 21 will not go on during use of INTELLIGENT EYE operation.
CAUTION
• Do not place large objects near the sensor.
Also keep heating units or humidifiers outside the sensor’s detection area. This sensor can detect undesirable objects.
• Do not hit or violently push the INTELLIGENT EYE sensor. This can lead to damage and malfunction.
Operation Manual
47
Operation Manual
2.6
SiBE041134
POWERFUL Operation
POWERFUL Operation
POWERFUL operation quickly maximizes the cooling (heating) effect in any
operation modes. You can get the maximum capacity.
„ To start POWERFUL operation
Press
during operation.
• POWERFUL operation ends in 20 minutes. Then the system automatically operates
again with the previous settings which were used before POWERFUL operation.
•“
” is displayed on the LCD.
„ To cancel POWERFUL operation
Press
•“
again.
” disappears from the LCD.
[Example]
„ Normal operation
• When you want to get the
cooling effect quickly, start
the POWERFUL operation.
„ POWERFUL operation
• POWERFUL operation will
work for 20 minutes.
„ Back to normal
operation
NOTE
„ Notes on POWERFUL operation
• When using POWERFUL operation, there are some functions which are not available.
• POWERFUL operation cannot be used together with ECONO, COMFORT AIRFLOW or OUTDOOR UNIT QUIET operation.
Priority is given to the function of whichever button is pressed last.
• POWERFUL operation can only be set when the unit is running. Pressing
causes the settings to be canceled, and the “
” disappears
from the LCD.
• POWERFUL operation will not increase the capacity of the air conditioner if the air conditioner is already in operation with its maximum
capacity demonstrated.
• In COOL and HEAT operation
To maximize the cooling (heating) effect, the capacity of outdoor unit is increased and the airflow rate is fixed to the maximum setting.
The temperature and airflow settings are not variable.
• In DRY operation
The temperature setting is lowered by 2.5˚C and the airflow rate is slightly increased.
• In FAN operation
The airflow rate is fixed to the maximum setting.
• In AUTO operation
To maximize the cooling (heating) effect, the capacity of outdoor unit is increased and the airflow rate is fixed to the maximum setting.
48
Operation Manual
SiBE041134
2.7
Operation Manual
OUTDOOR UNIT QUIET Operation
OUTDOOR UNIT QUIET
Operation
OUTDOOR UNIT QUIET operation lowers the noise level of the outdoor unit by
changing the frequency and fan speed on the outdoor unit. This function is
convenient during the night.
„ To start OUTDOOR UNIT QUIET operation
Press
•“
.
” is displayed on the LCD.
„ To cancel OUTDOOR UNIT QUIET operation
Press
•“
[Example]
again.
” disappears from the LCD.
Using the OUTDOOR UNIT QUIET operation during the night.
• The noise level of the outdoor unit will be lower.
This function is useful when you need to consider the noise for your neighbourhood.
NOTE
„ Notes on OUTDOOR UNIT QUIET operation
• This function is available in COOL, HEAT, and AUTO operation.
This is not available in FAN and DRY operation.
• POWERFUL operation and OUTDOOR UNIT QUIET operation cannot be used at the same time.
Priority is given to the function of whichever button is pressed last.
• Even the operation is stopped by using the remote controller or the indoor unit ON/OFF switch when using OUTDOOR UNIT QUIET
operation, “
” will remain on the remote controller display.
• OUTDOOR UNIT QUIET operation will drop neither the frequency nor fan speed if they have been already dropped low enough.
Operation Manual
49
Operation Manual
2.8
SiBE041134
ECONO Operation
ECONO Operation
ECONO operation is a function which enables efficient operation by limiting the
maximum power consumption value.
This function is useful for cases in which attention should be paid to ensure a
circuit breaker will not trip when the product runs alongside other appliances.
„ To start ECONO operation
Press
•“
during operation.
” is displayed on the LCD.
„ To cancel ECONO operation
Press
•“
again.
” disappears from the LCD.
[Example]
Normal operation
ECONO operation
• In case the air conditioner and other
appliances which require high power
consumption are used at same time, a circuit
breaker may trip if the air conditioner operate
with its maximum capacity.
Running current and
power consumption
Normal
operation
• The maximum power consumption of the air
conditioner is limited by using ECONO
operation.
The circuit breaker will hardly trip even if the
air conditioner and other appliances are used
at same time.
• This diagram is a representation for illustrative
purposes only.
Maximum during
The maximum running current and power
normal operation
consumption of the air conditioner in ECONO
Maximum during
operation vary with the connecting outdoor
ECONO operation
unit.
ECONO
operation
Time
From start up until set temperature is reached
NOTE
„ Notes on ECONO operation
• ECONO operation can only be set when the unit is running. Pressing
causes the settings to be canceled, and the “
” disappears from
the LCD.
• ECONO operation is a function which enables efficient operation by limiting the power consumption of the outdoor unit (operating frequency).
• ECONO operation functions in AUTO, COOL, DRY, and HEAT operation.
• POWERFUL and ECONO operation cannot be used at the same time.
Priority is given to the function of whichever button is pressed last.
• If the level of power consumption is already low, ECONO operation will not drop the power consumption.
50
Operation Manual
SiBE041134
2.9
Operation Manual
OFF TIMER Operation
OFF TIMER Operation
Timer functions are useful for automatically switching the air conditioner on or off
at night or in the morning. You can also use OFF TIMER and ON TIMER in
combination.
„ To use OFF TIMER operation
• Check that the clock is correct.
If not, set the clock to the present time.
1. Press
.
•“
•“
•“
” is displayed on the LCD.
” blinks.
” and day of the week disappear from the LCD.
2. Press
until the time setting reaches the
point you like.
• Each pressing of either button increases or decreases the time setting by 10 minutes.
Holding down either button changes the time setting rapidly.
3. Press
again.
•“
” and setting time are displayed on the LCD.
• The TIMER lamp lights yellow.
Display
„ To cancel OFF TIMER operation
Press
.
•“
” and setting time disappear from the LCD.
• “ ” and day of the week are displayed on the LCD.
• The TIMER lamp goes off.
NOTE
„ Notes on TIMER operation
• When TIMER is set, the present time is not displayed.
• Once you set ON/OFF TIMER, the time setting is kept in the memory. The memory is canceled when remote controller batteries are
replaced.
• When operating the unit via the ON/OFF TIMER, the actual length of operation may vary from the time entered by the user. (Maximum
approx. 10 minutes)
„ NIGHT SET mode
• When the OFF TIMER is set, the air conditioner automatically adjusts the temperature setting (0.5°C up in COOL, 2.0°C down in HEAT) to
prevent excessive cooling (heating) for your pleasant sleep.
Operation Manual
51
Operation Manual
SiBE041134
2.10 ON TIMER Operation
ON TIMER Operation
„ To use ON TIMER operation
• Check that the clock is correct.
If not, set the clock to the present time.
1. Press
.
•“
•“
•“
” is displayed on the LCD.
” blinks.
” and day of the week disappear from the LCD.
2. Press
until the time setting reaches the
point you like.
• Each pressing of either button increases or decreases the time setting by 10 minutes.
Holding down either button changes the setting rapidly.
3. Press
again.
•“
” and setting time are displayed on the LCD.
• The TIMER lamp lights yellow.
Display
„ To cancel ON TIMER operation
Press
.
•“
” and setting time disappear from the LCD.
• “ ” and day of the week are displayed on the LCD.
• The TIMER lamp goes off.
„ To combine ON TIMER and OFF TIMER
• A sample setting for combining the 2 timers is shown below.
(Example)
Present time: 23:00 (The unit operating)
OFF TIMER at 0:00
Combined
ON TIMER at 14:00
NOTE
„ In the following cases, set the timer again.
• After a breaker has turned off.
• After a power failure.
• After replacing batteries in the remote controller.
52
Operation Manual
SiBE041134
Operation Manual
2.11 WEEKLY TIMER Operation
WEEKLY TIMER Operation
Up to 4 timer settings can be saved for each day of the week. It is convenient if the WEEKLY TIMER is set
according to the family’s life style.
„ Using in these cases of WEEKLY TIMER
Example: The same timer settings are made for the week from Monday through Friday while different timer settings are
made for the weekend.
[Monday]
Make timer settings up to programs 1-4.
Program 1
ON
Page 24
Program 2
OFF
Program 3
ON
8:30
17:30
Program 4
OFF
27°C
25°C
6:00
[Tuesday]
to
[Friday]
22:00
Use the copy mode to make settings for Tuesday to Friday, because these settings are the same as
those for Monday. Page 26
Program 1
ON
Program 2
OFF
Program 3
ON
8:30
17:30
Program 4
OFF
27°C
25°C
6:00
[Saturday]
[Sunday]
22:00
No timer settings
Make timer settings up to programs 1-4.
Program 1
ON
Page 24
Program 2
OFF
25°C
8:00
Program 3
OFF
Program 4
ON
19:00
21:00
27°C
27°C
10:00
• Up to 4 reservations per day and 28 reservations per week can be set in the WEEKLY TIMER. The effective use of the
copy mode ensures ease of making reservations.
• The use of ON-ON-ON-ON settings, for example, makes it possible to schedule operating mode and set temperature
changes. Furthermore, by using OFF-OFF-OFF-OFF settings, only the turn off time of each day can be set. This will turn
off the air conditioner automatically if the user forgets to turn it off.
Operation Manual
53
Operation Manual
SiBE041134
„ To use WEEKLY TIMER operation
Setting mode
• Make sure the day of the week and time are set. If not, set the day of the week and time.
Program 1
Program 2
Program 3
Program 4
ON
OFF
ON
OFF
8:30
17:30
[Monday]
27°C
25°C
6:00
22:00
Setting Displays
Day and number
1. Press
ON/OFF
Time
Temperature
.
• The day of the week and the reservation number of the current day will be displayed.
• 1 to 4 settings can be made per day.
2. Press
to select the desired day of the week
and reservation number.
• Pressing
3. Press
changes the reservation number and the day of the week.
.
• The day of the week and reservation number will be set.
•“
” and “ ” blink.
4. Press
• Pressing
to select the desired mode.
changes “
” or “
” setting in sequence.
Pressing
alternates the following items appearing on the LCD in rotational
sequence.
ON TIMER
OFF TIMER
blank
• In case the reservation has already been set, selecting “blank” deletes the reservation.
• Go to step 9 if “blank” is selected.
• To return to the day of the week and reservation number setting, press
5. Press
.
.
• The ON/OFF TIMER mode will be set.
•“
” and the time blink.
54
Operation Manual
SiBE041134
Operation Manual
WEEKLY TIMER Operation
6. Press
to select the desired time.
• The time can be set between 0:00 and 23:50 in 10 minute intervals.
• To return to the ON/OFF TIMER mode setting, press
• Go to step 9 when setting the OFF TIMER.
7. Press
.
.
• The time will be set.
•“
” and the temperature blink.
8. Press
to select the desired temperature.
• The temperature can be set between 10˚C and 32˚C.
COOL or AUTO: The unit operates at 18˚C even if it is set at 10 to 17˚C.
HEAT or AUTO: The unit operates at 30˚C even if it is set at 31 to 32˚C.
• To return to the time setting, press
.
• The set temperature is only displayed when the mode setting is on.
9. Press
.
• Be sure to direct the remote controller toward the indoor unit and check for a receiving
tone and flashing the OPERATION lamp.
• The temperature is set while in ON TIMER operation, and the time is set while in OFF
TIMER operation.
• The next reservation screen will appear.
• To continue further settings, repeat the procedure from step 4.
• The TIMER lamp lights yellow.
Display
10. Press
to complete the setting.
•“
” is displayed on the LCD and WEEKLY TIMER operation is activated.
• A reservation made once can be easily copied and the same settings used for another
day of the week. Refer to copy mode. Page 26
NOTE
„ Notes on WEEKLY TIMER operation
• Do not forget to set the clock on the remote controller first.
• The day of the week, ON/OFF TIMER mode, time and set temperature (only for ON TIMER mode) can be set with WEEKLY TIMER.
Other settings for ON TIMER are based on the settings just before the operation.
• Both WEEKLY TIMER and ON/OFF TIMER operation cannot be used at the same time. The ON/OFF TIMER operation has priority if it is set
while WEEKLY TIMER is still active. The WEEKLY TIMER will go into standby state, and “
” will disappear from the LCD. When ON/
OFF TIMER is up, the WEEKLY TIMER will automatically become active.
• Shutting the breaker off, power failure, and other similar events will render operation of the indoor unit’s internal clock inaccurate. Reset the
clock.
Operation Manual
55
Operation Manual
SiBE041134
Copy mode
• A reservation made once can be copied to another day of the week. The whole reservation
of the selected day of the week will be copied.
Program 1
ON
[Monday]
[Tuesday]
to
[Friday]
Program 2
OFF
Program 3
ON
27°C
25°C
6:00
8:30
Program 1
ON
Program 2
OFF
17:30
22:00
Program 3
ON
Program 4
OFF
27°C
25°C
6:00
Program 4
OFF
8:30
17:30
22:00
Setting Displays
Confirmation
Copy
Paste
Normal
1. Press
.
2. Press
to confirm the day of the week to be
copied.
3. Press
.
• The whole reservation of the selected day of the week will be copied.
4. Press
to select the destination day of the
week.
5. Press
.
• Be sure to direct the remote controller toward the indoor unit and check for a receiving
tone and flashing the OPERATION lamp.
• The reservation will be copied to the selected day of the week. The whole reservation
of the selected day of the week will be copied.
• To continue copying the settings to other days of the week, repeat step 4 and step 5.
• The TIMER lamp lights yellow.
6. Press
•“
to complete the setting.
” is displayed on the LCD and WEEKLY TIMER operation is activated.
NOTE
„ Note on copy mode
• The entire reservation of the source day of the week is copied in the copy mode.
In the case of making a reservation change for any day of the week individually after copying the content of weekly reservations, press
and change the settings in the steps of setting mode. Page 24
56
Operation Manual
SiBE041134
Operation Manual
WEEKLY TIMER Operation
„ Confirming a reservation
• The reservation can be confirmed.
Setting Displays
Normal
1. Press
Confirmation
.
• The day of the week and the reservation number of the current day will be displayed.
2. Press
to select the day of the week and the
reservation number to be confirmed.
• Pressing
displays the reservation details.
• To change the confirmed reserved settings, select the reservation number and press
.
The mode is switched to setting mode. Go to setting mode step 2. Page 24
3. Press
to exit confirming mode.
„ To deactivate WEEKLY TIMER operation
Press
LCD.
while “
” is displayed on the
• The “
” will disappear from the LCD.
• The TIMER lamp goes off.
• To reactivate the WEEKLY TIMER operation, press
• If a reservation deactivated with
mode will be used.
again.
is activated once again, the last reservation
CAUTION
• If not all the reservation settings are reflected, deactivate the WEEKLY TIMER operation once. Then press
WEEKLY TIMER operation.
Operation Manual
again to reactivate the
57
Operation Manual
SiBE041134
„ To delete reservations
The individual reservation
1. Press
.
• The day of the week and the reservation number will be displayed.
2. Press
to select the day of the week and the
reservation number to be deleted.
3. Press
•“
.
” and “
4. Press
• Pressing
” or “
” blink.
and select “blank ”.
changes ON/OFF TIMER mode.
Pressing
alternates the following items appearing on the LCD in rotational sequence.
• The reservation will be no setting with selecting “blank”.
ON TIMER
OFF TIMER
5. Press
blank
.
• The selected reservation will be deleted.
6. Press
.
• If there are still other reservations, WEEKLY TIMER operation will be activated.
The reservations for each day of the week
• This function can be used for deleting reservations for each day of the week.
• It can be used while confirming or setting reservations.
1. Press
to select the day of the week to be
deleted.
2. Hold
for 5 seconds.
• The reservation of the selected day of the week will be deleted.
All reservations
Hold
for 5 seconds while normal display.
• Be sure to direct the remote controller toward the indoor unit and check for a receiving tone.
• This operation is not effective while WEEKLY TIMER is being set.
• All reservations will be deleted.
3P297033-1
58
Operation Manual
SiBE041134
Part 6
Service Diagnosis
1. Troubleshooting with LED .....................................................................60
1.1 Indoor Unit..............................................................................................60
1.2 Outdoor Unit ...........................................................................................60
2. Problem Symptoms and Measures .......................................................61
3. Service Check Function ........................................................................62
4. Troubleshooting ....................................................................................65
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15
4.16
4.17
4.18
4.19
4.20
4.21
4.22
4.23
4.24
Error Codes and Description ..................................................................65
Indoor Unit PCB Abnormality .................................................................66
Freeze-up Protection Control or Heating Peak-cut Control....................68
Fan Motor (DC Motor) or Related Abnormality.......................................70
Thermistor or Related Abnormality (Indoor Unit)....................................72
Refrigerant Shortage ..............................................................................73
Low-voltage Detection or Over-voltage Detection..................................75
Signal Transmission Error (between Indoor Unit and Outdoor Unit) ......77
Unspecified Voltage (between Indoor Unit and Outdoor Unit) ...............79
Outdoor Unit PCB Abnormality...............................................................80
OL Activation (Compressor Overload) ...................................................81
Compressor Lock ...................................................................................82
DC Fan Lock ..........................................................................................83
Input Overcurrent Detection ...................................................................84
Four Way Valve Abnormality..................................................................85
Discharge Pipe Temperature Control.....................................................87
High Pressure Control in Cooling ...........................................................88
Compressor System Sensor Abnormality ..............................................89
Position Sensor Abnormality ..................................................................90
DC Voltage / Current Sensor Abnormality..............................................92
Thermistor or Related Abnormality (Outdoor Unit).................................93
Electrical Box Temperature Rise............................................................95
Radiation Fin Temperature Rise ............................................................97
Output Overcurrent Detection ................................................................99
5. Check ..................................................................................................101
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
Service Diagnosis
Thermistor Resistance Check ..............................................................101
Fan Motor Connector Output Check ....................................................102
Power Supply Waveforms Check.........................................................102
Electronic Expansion Valve Check.......................................................103
Four Way Valve Performance Check ...................................................104
Inverter Units Refrigerant System Check .............................................104
“Inverter Checker” Check .....................................................................105
Rotation Pulse Check on the Outdoor Unit PCB ..................................106
Installation Condition Check.................................................................107
Discharge Pressure Check...................................................................107
Outdoor Fan System Check .................................................................108
Main Circuit Short Check......................................................................108
Power Module Check ...........................................................................109
59
Troubleshooting with LED
SiBE041134
1. Troubleshooting with LED
1.1
Indoor Unit
Operation Lamp
The operation lamp blinks when any of the following errors is detected.
1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor
malfunctions.
2. When a signal transmission error occurs between the indoor and outdoor units.
In either case, conduct the diagnostic procedure described in the following pages.
Operation lamp
(green)
Service Monitor
1.2
The indoor unit has one green LED (LED A) on the control PCB. When the microcomputer
works in order, the LED A blinks.
Outdoor Unit
The outdoor unit has one green LED (LED A) on the PCB. When the microcomputer works in
order, the LED A blinks.
60
Service Diagnosis
SiBE041134
Problem Symptoms and Measures
2. Problem Symptoms and Measures
Symptom
Check Item
The unit does not operate. Check the power supply.
Check the type of the indoor unit.
Check the outdoor temperature.
Diagnose with remote controller
indication.
Check the remote controller
addresses.
Operation sometimes
stops.
Check the power supply.
Check the outdoor temperature.
Diagnose with remote controller
indication.
The unit operates but does Check for wiring and piping errors in
not cool, or does not heat. the connection between the indoor
unit and outdoor unit.
Check if the rated voltage is supplied.
Reference
Page
—
Check if the indoor unit type is compatible with
the outdoor unit.
Heating operation cannot be used when the
outdoor temperature is 24°C or higher, and
cooling operation cannot be used when the
outdoor temperature is below –10°C.
—
—
65
Check if address settings for the remote
controller and indoor unit are correct.
A power failure of 2 to 10 cycles stops air
conditioner operation. (Operation lamp OFF)
Heating operation cannot be used when the
outdoor temperature is 24°C or higher, and
cooling operation cannot be used when the
outdoor temperature is below –10°C.
—
167
—
—
—
65
—
—
Check for thermistor detection errors. Check if the thermistor is mounted securely.
Check for faulty operation of the
Set the unit to cooling operation, and check the
electronic expansion valve.
temperature of the liquid pipe to see if the
electronic expansion valve works.
—
Diagnose with remote controller
indication.
Diagnose by service port pressure
and operating current.
65
Large operating noise and Check the output voltage of the
vibrations
power module.
Check the power module.
Check the installation condition.
Service Diagnosis
Details of Measure
—
Check for refrigerant shortage.
—
73
—
109
—
—
Check if the required spaces for installation
(specified in the installation manual) are
provided.
—
61
Service Check Function
SiBE041134
3. Service Check Function
Check Method 1
1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature
display screen.
Timer cancel button
(R14553)
< ARC466 Series >
2. Press the timer cancel button repeatedly until a long beep sounds.
„ The code indication changes in the sequence shown below.
Note:
62
No.
1
Code
00
No.
13
Code
C7
No.
25
Code
UA
2
3
U4
L5
14
15
A3
H8
26
27
UH
P4
4
5
E6
H6
16
17
H9
C9
28
29
L3
L4
6
7
H0
A6
18
19
C4
C5
30
31
H7
U2
8
9
E7
U0
20
21
J3
J6
32
33
EA
AH
10
11
F3
A5
22
23
E5
A1
34
35
FA
H1
12
F6
24
E1
36
P9
1. A short beep or two consecutive beeps indicate non-corresponding codes.
2. To return to the normal mode, hold the timer cancel button down for 5 seconds. When the
remote controller is left untouched for 60 seconds, it also returns to the normal mode.
3. Not all the error codes are displayed. When you cannot find the error code, try the check
method 2. (→ Refer to page 63.)
Service Diagnosis
SiBE041134
Service Check Function
Check Method 2
1. Press the center of the [Temp] button and the [Mode] button at the same time.
(R11669)
5C is displayed on the LCD.
(R11821)
2. Select 5C (service check) with the [Temp]
or
button.
3. Press the [Mode] button to enter the service check mode.
(R11672)
The left-side number blinks.
(R11670)
4. Press the [Temp] or button and change the number until you hear the two consecutive
beeps or the long beep.
(R11671)
Service Diagnosis
63
Service Check Function
SiBE041134
5. Diagnose by the sound.
beep : The left-side number does not correspond with the error code.
two consecutive beeps : The left-side number corresponds with the error code but the
right-side number does not.
long beep : Both the left-side and right-side numbers correspond with the error code.
(The numbers indicated when you hear the long beep are the error code.
→ Refer to page 65.)
6. Press the [Mode] button.
(R11672)
The right-side number blinks.
(R11673)
7. Press the [Temp]
or
button and change the number until you hear the long beep.
(R11671)
8. Diagnose by the sound.
beep : The left-side number does not correspond with the error code.
two consecutive beeps : The left-side number corresponds with the error code but the
right-side number does not.
long beep : Both the left-side and right-side numbers correspond with the error code.
9. Determine the error code.
The numbers indicated when you hear the long beep are the error code.
Error codes and description → Refer to page 65.
10. Press the [Mode] button for 5 seconds to exit from the service check mode.
(When the remote controller is left untouched for 60 seconds, it returns to the normal mode
also.)
(R11672)
64
Service Diagnosis
SiBE041134
Troubleshooting
4. Troubleshooting
4.1
Error Codes and Description
Error Codes
System
Indoor
Unit
Outdoor
Unit
00
U0
U2
U4
UA
A1
A5
A6
C4
C9
E1
E5
E6
E7
E8
EA
F3
F6
H0
H6
H8
H9
J3
J6
L3
L4
L5
P4
Description
Reference
Page
Normal
—
Refrigerant shortage
73
Low-voltage detection or over-voltage detection
75
Signal transmission error (between indoor unit and outdoor unit)
77
Unspecified voltage (between indoor unit and outdoor unit)
79
Indoor unit PCB abnormality
66
Freeze-up protection control or heating peak-cut control
68
Fan motor (DC motor) or related abnormality
70
Indoor heat exchanger thermistor or related abnormality
72
Room temperature thermistor or related abnormality
72
Outdoor unit PCB abnormality
80
OL activation (compressor overload)
81
Compressor lock
82
DC fan lock
83
Input overcurrent detection
84
Four way valve abnormality
85
Discharge pipe temperature control
87
High pressure control in cooling
88
Compressor system sensor abnormality
89
Position sensor abnormality
90
DC voltage / current sensor abnormality
92
Outdoor temperature thermistor or related abnormality
93
Discharge pipe thermistor or related abnormality
93
Outdoor heat exchanger thermistor or related abnormality
93
Electrical box temperature rise
95
Radiation fin temperature rise
97
Output overcurrent detection
99
Radiation fin thermistor or related abnormality
93
: Displayed only when system-down occurs.
Service Diagnosis
65
Troubleshooting
4.2
SiBE041134
Indoor Unit PCB Abnormality
Remote
Controller
Display
A1
Method of
Malfunction
Detection
The system checks if the circuit works properly within the microcomputer of the indoor unit.
Malfunction
Decision
Conditions
The system cannot set the internal settings.
Supposed
Causes
„
„
„
„
66
Wrong models interconnected
Defective indoor unit PCB
Disconnection of connector
Reduction of power supply voltage
Service Diagnosis
SiBE041134
Troubleshooting
Troubleshooting
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Check the combination of the
indoor and outdoor unit.
OK?
NO
Match the compatible
models.
YES
Check the connection of
connectors (See Note.).
OK?
∗ To secure the connection,
once disconnect the connector
and then reconnect it.
YES
Check the power supply
voltage.
NO
Voltage as rated?
NO
Correct the power
supply.
YES
Start operation.
Correct the connection.
Error repeats?
YES
NO
Error repeats?
YES
Replace the indoor unit
PCB (1).
Completed.
Check the power supply
voltage.
NO
Voltage as rated?
NO
Correct the power
supply.
YES
Start operation.
Error repeats?
NO
YES
Replace the indoor unit
PCB (1).
Completed.
Completed.
(R15270)
Note:
Check the following connector.
Model Type
Wall Mounted Type
Service Diagnosis
Connector
Terminal board ~ Control PCB
67
Troubleshooting
4.3
SiBE041134
Freeze-up Protection Control or Heating Peak-cut
Control
Remote
Controller
Display
A5
Method of
Malfunction
Detection
„ Freeze-up protection control
During cooling operation, the freeze-up protection control (operation halt) is activated
according to the temperature detected by the indoor heat exchanger thermistor.
„ Heating peak-cut control
During heating operation, the temperature detected by the indoor heat exchanger thermistor
is used for the heating peak-cut control (operation halt, outdoor fan stop, etc.)
Malfunction
Decision
Conditions
„ Freeze-up protection control
During cooling operation, the indoor heat exchanger temperature is below 0°C.
„ Heating peak-cut control
During heating operation, the indoor heat exchanger temperature is above 65°C
Supposed
Causes
„
„
„
„
„
68
Short-circuited air
Clogged air filter of the indoor unit
Dust accumulation on the indoor heat exchanger
Defective indoor heat exchanger thermistor
Defective indoor unit PCB
Service Diagnosis
SiBE041134
Troubleshooting
Troubleshooting
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Check No.01
Refer to P.101
Check the air passage.
Is there any short circuit?
YES
Provide sufficient air passage.
NO
Check the air filter.
Dirty?
Is it very
dirty?
YES
Clean the air filter.
NO
Check the dust accumulation on
the indoor heat exchanger.
Dirty?
Is it very
dirty?
YES
Clean the indoor heat
exchanger.
NO
Check
Check No.
No. 01
06
Check
Check the
the indoor
indoor heat
heat exchanger
exchanger
thermistor.
thermistor.
As it
Does
described
the
conform tointhe
thermistor characteristic
characteristic
thermistor
chart?
chart?
YES
NO
Replace the thermistor.
Replace the indoor unit PCB.
(R15715)
(R7131)
Service Diagnosis
69
Troubleshooting
4.4
SiBE041134
Fan Motor (DC Motor) or Related Abnormality
Remote
Controller
Display
A6
Method of
Malfunction
Detection
The rotation speed detected by the Hall IC during fan motor operation is used to determine
abnormal fan motor operation.
Malfunction
Decision
Conditions
The detected rotation speed does not reach the demanded rotation speed of the target tap, and
is less than 50% of the maximum fan motor rotation speed.
Supposed
Causes
„
„
„
„
„
„
„
70
Disconnection of connector
Foreign matters stuck in the fan
Layer short inside the fan motor winding
Breaking of wire inside the fan motor
Breaking of the fan motor lead wires
Defective capacitor of the fan motor
Defective indoor unit PCB
Service Diagnosis
SiBE041134
Troubleshooting
Troubleshooting
Caution
Check No.03
Refer to P.102
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Turn off the power.
(Unplug the power cable or turn
the breaker OFF.)
Note: The motor may break when the
motor connector is disconnected
while remaining power supply.
(Turn off the power supply before
connecting the connector also.)
Check the connector for
connection.
∗ To secure the connection,
once disconnect the connector
and then reconnect it.
OK?
NO
Correct the connection.
YES
Foreign matters in or
around the fan?
YES
Remove the foreign matters.
NO
Rotate the fan.
Fan rotates smoothly?
NO
Replace the indoor unit PCB (1).
YES
Check No. 03
Check the fan motor for
breakdown or short circuit.
Resistance OK?
NO
Replace the indoor fan motor.
YES
Turn the power on again.
Check No. 03
Check the motor control voltage.
Is the motor control
voltage 15 VDC
generated?
NO
Replace the indoor unit PCB (1).
YES
Check No. 03
Check the indoor unit PCB for
rotation pulse.
Is the rotation pulse
generated?
YES
NO
Replace the indoor fan motor.
Replace the indoor unit PCB (1).
(R16048)
Service Diagnosis
71
Troubleshooting
4.5
SiBE041134
Thermistor or Related Abnormality (Indoor Unit)
Remote
Controller
Display
C4, C9
Method of
Malfunction
Detection
The temperatures detected by the thermistors determine thermistor errors.
Malfunction
Decision
Conditions
The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation.
Supposed
Causes
„ Disconnection of connector
„ Defective thermistor
„ Defective indoor unit PCB
Troubleshooting
Caution
Check No.01
Refer to P.101
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check the connection of
connectors.
Normal?
NO
Correct the connection.
YES
Check No. 01
Check the thermistor resistance
value.
Normal?
NO
YES
Replace the thermistor.
Replace the indoor unit PCB.
(R15717)
C4 : Indoor heat exchanger thermistor
C9 : Room temperature thermistor
72
Service Diagnosis
SiBE041134
4.6
Troubleshooting
Refrigerant Shortage
Remote
Controller
Display
Method of
Malfunction
Detection
U0
Refrigerant shortage detection I:
Refrigerant shortage is detected by checking the input current value and the compressor
running frequency. If the refrigerant is short, the input current is lower than the normal value.
Refrigerant shortage detection II:
Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of
the electronic expansion valve. If the refrigerant is short, the discharge pipe temperature tends
to rise.
Refrigerant shortage detection III:
Refrigerant shortage is detected by checking the difference between suction and discharge
temperature.
Malfunction
Decision
Conditions
Refrigerant shortage detection I:
The following conditions continue for 7 minutes.
Š Input current × input voltage ≤ A × output frequency + B
Š Output frequency > C
A (–)
B (W)
C (Hz)
640/256
0
55
Refrigerant shortage detection II :
The following conditions continue for 80 seconds.
Š Opening of the electronic expansion valve ≥ D
Š Discharge pipe temperature > E × target discharge pipe temperature + F
D (pulse)
E (–)
F (°C)
480
128/128
30
Refrigerant shortage detection III :
When the difference of the temperature is smaller than G°C, it is regarded as refrigerant
shortage.
G (°C)
Cooling
room thermistor temperature – indoor heat exchanger temperature
outdoor heat exchanger temperature – outdoor temperature
4.0
4.0
Heating
indoor heat exchanger temperature – room thermistor temperature
outdoor temperature – outdoor heat exchanger temperature
3.0
3.0
„ If the error repeats, the system is shut down.
„ Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Service Diagnosis
„ Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor,
room or outdoor temperature thermistor
„ Closed stop valve
„ Refrigerant shortage (refrigerant leakage)
„ Poor compression performance of compressor
„ Defective electronic expansion valve
73
Troubleshooting
SiBE041134
Troubleshooting
Caution
Check No.01
Refer to P.101
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Any thermistor
disconnected?
NO
Check No.12
Refer to P.103
Stop valve closed?
YES
∗ Discharge pipe thermistor
∗ Indoor or outdoor heat exchanger thermistor
∗ Room temperature thermistor
∗ Outdoor temperature thermistor
YES
Replace the thermistor(s) in
position.
Open the stop valve.
NO
Check for refrigerant shortage.
Oil oozing at relay
pipe connections?
YES
Repair the pipe flare or
replace the union.
NO
Oil oozing at internal
piping?
YES
NO
Compressor vibrating
too much?
NO
Check No. 12
Electronic expansion valve
functioning?
YES Check the power transistor
harness for loosening.
Correct it as required. Also
replace the cracked pipe.
Check the pipes for
improper contact and
correct them as required.
Replace the cracked pipe.
NO
Replace the electronic
expansion valve.
YES
Change for a specified amount of
fresh refrigerant.
Refrigerant shortage error
again?
NO
YES
Check No. 01
Check the thermistors.
NG
Replace the defective
thermistor(s).
OK
Replace the outdoor unit PCB.
Error again?
YES
Replace the compressor.
NO
Completed.
Completed.
(R16015)
74
Service Diagnosis
SiBE041134
4.7
Troubleshooting
Low-voltage Detection or Over-voltage Detection
Remote
Controller
Display
Method of
Malfunction
Detection
U2
Indoor Unit
The zero-cross detection of the power supply is evaluated by the indoor unit PCB.
Outdoor Unit
Low-voltage detection:
An abnormal voltage drop is detected by the DC voltage detection circuit.
Over-voltage detection:
An abnormal voltage rise is detected by the over-voltage detection circuit.
Malfunction
Decision
Conditions
Indoor Unit
There is no zero-cross detection in approximately 10 seconds.
Outdoor Unit
Low-voltage detection:
„ The voltage detected by the DC voltage detection circuit is below 180 V.
„ The compressor stops if the error occurs, and restarts automatically after 3-minute standby.
Over-voltage detection:
„ An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer.
„ The compressor stops if the error occurs, and restarts automatically after 3-minute standby.
Supposed
Causes
Service Diagnosis
„
„
„
„
„
„
„
„
„
Supply voltage is not as specified.
Defective DC voltage detection circuit
Defective over-voltage detection circuit
Defective PAM control part
Disconnection of compressor harness
Noise
Momentary fall of voltage
Momentary power failure
Defective indoor unit PCB
75
Troubleshooting
SiBE041134
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check the power supply voltage.
Voltage as rated?
NO
Correct the power supply.
YES
Check the connection of the
compressor harness.
Loose or
disconnected?
YES
Reconnect the harness.
NO
(Precaution before turning on the power again)
Make sure the power has been off for at
least 30 seconds.
Turn on the
power again. System
restarted?
YES Disturbance factors
∗ Noise ∗ Power supply distortion
Check for such factors for a
long term.
∗ Try to restart a few times.
NO
Repeat a few
times.
Error
again within 3 minutes
after turning on the
power?
YES
Replace the indoor
unit PCB.
NO
Replace the outdoor
unit PCB.
(R16043)
76
Service Diagnosis
SiBE041134
4.8
Troubleshooting
Signal Transmission Error (between Indoor Unit and
Outdoor Unit)
Remote
Controller
Display
U4
Method of
Malfunction
Detection
The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is
checked whether it is normal.
Malfunction
Decision
Conditions
The data sent from the outdoor unit cannot be received normally, or the content of the data is
abnormal.
Supposed
Causes
„
„
„
„
„
„
Service Diagnosis
Reduction of power supply voltage
Wiring error
Breaking of the connection wires between the indoor and outdoor units (wire No. 3)
Defective outdoor unit PCB
Defective indoor unit PCB
Disturbed power supply waveform
77
Troubleshooting
SiBE041134
Troubleshooting
Caution
Check No.11
Refer to P.102
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check the power supply voltage.
Voltage as rated?
NO
Correct the power supply.
YES
Check the indoor unit - outdoor
unit connection wires.
Is there any wiring error?
YES
Correct the indoor unit outdoor unit connection wires.
NO
Check the voltage of the
connection wires on the indoor
terminal board between No. 1
and No. 3, and between No. 2
and No. 3.
Properly insulated?
NO
Check the LED A on the outdoor
unit PCB.
Is LED A blinking?
YES
∗ Before you check the LED A, cancel
the standby electricity saving
function by operating fan operation
with the remote controller.
∗ Wait at least for 7 sec. after turning
on the power.
NO
Replace the connection wires
between the indoor unit and
outdoor unit.
Diagnose the outdoor unit
PCB.
YES
Check No.11
Check the power supply
waveform.
Is there any disturbance?
YES
NO
Replace the indoor unit PCB.
Locate the cause of the
disturbance of the power
supply waveform, and correct
it.
(R15198)
78
Service Diagnosis
SiBE041134
4.9
Troubleshooting
Unspecified Voltage (between Indoor Unit and Outdoor
Unit)
Remote
Controller
Display
UA
Method of
Malfunction
Detection
The supply power is detected for its requirements (different from pair type and multi type) by the
indoor / outdoor transmission signal.
Malfunction
Decision
Conditions
The pair type and multi type are interconnected.
Supposed
Causes
„
„
„
„
„
Wrong models interconnected
Wrong wiring of connecting wires
Wrong indoor unit PCB or outdoor unit PCB mounted
Defective indoor unit PCB
Defective outdoor unit PCB
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check the combination of the
indoor and outdoor unit.
OK?
NO
Match the compatible models.
YES
Are the
connection wires connected
property?
NO
Correct the connection.
YES
Check the code numbers
(2P01234, for example) of the
indoor and outdoor unit PCB with
the Parts List.
Matched compatibly?
YES
NO
Change for the correct PCB.
Replace the indoor unit PCB
(or the outdoor unit PCB).
(R11707)
Service Diagnosis
79
Troubleshooting
SiBE041134
4.10 Outdoor Unit PCB Abnormality
Remote
Controller
Display
E1
Method of
Malfunction
Detection
„ The system checks if the microprocessor is working in order.
„ The system checks if the zero-cross signal comes in properly.
Malfunction
Decision
Conditions
„ The microprocessor program runs out of control.
„ The zero-cross signal is not detected.
Supposed
Causes
„
„
„
„
„
Defective outdoor unit PCB
Broken harness between PCBs
Noise
Momentary fall of voltage
Momentary power failure, etc.
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Turn on the power again.
∗ Before you check the LED A,
cancel the standby electricity
saving function by operating
fan operation with the remote
controller.
∗ Wait at least for 7 sec. after
NO turning on the power.
Is LED A blinking?
Replace the outdoor unit
PCB (2).
YES
Check to see if the outdoor unit is
grounded.
Grounded?
NO
Ground the system.
YES
Is the harness
broken?
YES
Replace the harness.
NO
Zero-cross signal
abnormality.
Replace the outdoor unit
PCB (1).
(R14138)
80
Service Diagnosis
SiBE041134
Troubleshooting
4.11 OL Activation (Compressor Overload)
Remote
Controller
Display
E5
Method of
Malfunction
Detection
A compressor overload is detected through compressor OL.
Malfunction
Decision
Conditions
„ If the error repeats, the system is shut down.
„ Reset condition: Continuous run for about 60 minutes without any other error
∗ The operating temperature condition is not specified.
Supposed
Causes
„
„
„
„
„
„
„
Defective discharge pipe thermistor
Defective electronic expansion valve or coil
Defective four way valve or coil
Defective outdoor unit PCB
Refrigerant shortage
Water mixed in refrigerant
Defective stop valve
Troubleshooting
Caution
Check No.01
Refer to P.101
Check No.12
Refer to P.103
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Discharge
pipe thermistor
disconnected?
NG
∗ Discharge pipe thermistor
Replace the discharge pipe
thermistor.
OK
Check No. 12
Check the electronic
expansion valve.
Check No.14
Refer to P.104
Insert the thermistor in
position.
NO
Check No. 01
Check the thermistors.
Check No.13
Refer to P.104
YES
NG
Replace the electronic
expansion valve or the coil.
OK
Check No. 13
Check the four way
valve.
NG
Replace the four way valve
or the coil.
Replace the outdoor unit
PCB.
OK
Check No. 14
Check the refrigerant
line.
OK
NG
∗ Refrigerant shortage
∗ Water mixed
∗ Stop valve
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R14438)
Service Diagnosis
81
Troubleshooting
SiBE041134
4.12 Compressor Lock
Remote
Controller
Display
E6
Method of
Malfunction
Detection
A compressor lock is detected by checking the compressor running condition through the
position detection circuit.
Malfunction
Decision
Conditions
„ Operation stops due to overcurrent.
„ If the error repeats, the system is shut down.
„ Reset condition: Continuous run for about 11 minutes without any other error
Supposed
Causes
„ Compressor locked
„ Compressor harness disconnected
Troubleshooting
Caution
Check No.15
Refer to P.105
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
(Precaution before turning on the power again)
Make sure the power has been off for at least 30 seconds.
Turn off the power. Disconnect the
harnesses U, V, and W.
∗ Inverter checker
Check No.15
Part No.: 1225477
Check with the inverter checker (∗).
Normal?
NO
Correct the power supply or
replace the outdoor unit
PCB.
YES
Turn off the power and reconnect
the harnesses. Turn on the power
again and restart the system.
Emergency
stop without compressor
running?
YES
Replace the compressor.
NO
System shut
down after errors repeated
several times?
YES
NO
Check the outdoor electronic
expansion valve coil.
Replace it as required.
Replace the compressor.
(R14439)
82
Service Diagnosis
SiBE041134
Troubleshooting
4.13 DC Fan Lock
Remote
Controller
Display
E7
Method of
Malfunction
Detection
An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC.
Malfunction
Decision
Conditions
„ The fan does not start in 15 ~ 60 seconds (depending on the model) even when the fan
motor is running.
„ If the error repeats, the system is shut down.
„ Reset condition: Continuous run for about 11 minutes without any other error
Supposed
Causes
„ Foreign matter stuck in the fan
„ Defective fan motor
„ Defective outdoor unit PCB
Troubleshooting
Caution
Check No.16
Refer to P.106
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Fan motor connector
disconnected?
YES
Turn off the power and
reconnect the connector.
NO
Foreign matters in or
around the fan?
YES
Remove the foreign
matters.
NO
Turn on the power.
Rotate the fan.
Fan rotates
smoothly?
NO
Replace the outdoor fan
motor.
YES
Check No. 16
Check the rotation pulse input on
the outdoor unit PCB.
Pulse signal generated?
YES
NO
Replace the outdoor fan
motor.
Replace the outdoor unit
PCB.
(R15675)
Service Diagnosis
83
Troubleshooting
SiBE041134
4.14 Input Overcurrent Detection
Remote
Controller
Display
E8
Method of
Malfunction
Detection
An input overcurrent is detected by checking the input current value with the compressor
running.
Malfunction
Decision
Conditions
„ The current exceeds about 9.25 A for 2.5 seconds with the compressor running.
(The upper limit of the current decreases when the outdoor temperature exceeds a certain
level.)
Supposed
Causes
„
„
„
„
Defective compressor
Defective power module
Defective outdoor unit PCB
Short circuit
Troubleshooting
Caution
Check No.15
Refer to P.105
Check No.17
Refer to P.107
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
∗ An input overcurrent may result from wrong internal wiring. If the system is interrupted by an input
overcurrent after the wires have been disconnected and reconnected for part replacement, check the
wiring again.
Check No. 17
Check the installation condition.
Start operation and measure the
input current.
Check No.18
Refer to P.107
Input current flowing
above its stop level?
NO
Replace the outdoor unit
PCB.
YES
Turn off the power and disconnect
the harnesses U, V, and W.
Check No.15
Check with the inverter checker (∗).
Any LED off?
NO
∗ Inverter checker
Part No.: 1225477
YES
Correct the power supply or
replace the outdoor unit
PCB.
Turn off the power, and reconnect
the harnesses. Turn on the power
again and start operation.
Check No. 18
Check the discharge pressure.
(R14440)
84
Service Diagnosis
SiBE041134
Troubleshooting
4.15 Four Way Valve Abnormality
Remote
Controller
Display
EA
Method of
Malfunction
Detection
The room temperature thermistor, the indoor heat exchanger thermistor, the outdoor
temperature thermistor, and the outdoor heat exchanger thermistor are checked if they function
within their normal ranges in each operation mode.
Malfunction
Decision
Conditions
A following condition continues over 10 minutes after operating for 5 minutes.
„ Cooling / Dry
(room thermistor temp. – indoor heat exchanger temp.) < –5°C
„ Heating
(indoor heat exchanger temp. – room thermistor temp.) < –5°C
„ If the error repeats, the system is shut down.
„ Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Service Diagnosis
„
„
„
„
„
„
„
Disconnection of four way valve coil
Defective four way valve, coil, or harness
Defective outdoor unit PCB
Defective thermistor
Refrigerant shortage
Water mixed in refrigerant
Defective stop valve
85
Troubleshooting
SiBE041134
Troubleshooting
Caution
Check No.01
Refer to P.101
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Four way valve coil
disconnected (loose)?
YES
Correct the four way valve
coil.
NO
Check No.13
Refer to P.104
Harness out of connector?
YES
Reconnect the harness.
NO
Check No.14
Refer to P.104
Check the continuity of the four way
valve coil and harness.
Disconnect the harness from the
connector.
Resistance
between harnesses about
1000 ~ 2000 Ω?
NO
Replace the four way
valve coil.
YES
Check No. 13
Check the four way valve
switching output.
NG
Replace the outdoor
unit PCB.
OK
Any thermistor
disconnected?
YES
Reconnect the
thermistor(s).
NO
Check No. 01
Check the thermistors.
NG
Replace the defective
thermistor(s).
OK
Check No. 14
Check the refrigerant
line.
NG
∗ Refrigerant shortage
∗ Water mixed
∗ Stop valve
Refer to the refrigerant line
check procedure.
OK
Replace the four way valve
(defective or dust-clogged).
(R15824)
86
Service Diagnosis
SiBE041134
Troubleshooting
4.16 Discharge Pipe Temperature Control
Remote
Controller
Display
F3
Method of
Malfunction
Detection
An error is determined with the temperature detected by the discharge pipe thermistor.
Malfunction
Decision
Conditions
„ If the temperature detected by the discharge pipe thermistor rises above A°C, the
compressor stops.
„ The error is cleared when the discharge pipe temperature has dropped below B°C.
A (°C)
B (°C)
(1) above 45 Hz (rising), above 40 Hz (dropping)
110
97
(2) 30 ~ 45 Hz (rising), 25 ~ 40 Hz (dropping)
(3) below 30 Hz (rising), below 25 Hz (dropping)
105
99
92
86
„ If the error repeats, the system is shut down.
„ Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
„ Defective discharge pipe thermistor
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
„ Defective electronic expansion valve or coil
„ Refrigerant shortage
„ Defective four way valve
„ Water mixed in refrigerant
„ Defective stop valve
„ Defective outdoor unit PCB
Troubleshooting
Caution
Check No.01
Refer to P.101
Check No.12
Refer to P.103
Check No.14
Refer to P.104
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check No. 01
Check the thermistors.
OK
Check No. 12
Check the electronic
expansion valve.
NG
∗ Discharge pipe thermistor
∗ Outdoor heat exchanger thermistor
∗ Outdoor temperature thermistor
NG
Replace the defective
thermistor(s).
Replace the electronic
expansion valve or the coil.
OK
Check No. 14
Check the refrigerant
line.
OK
NG
∗ Refrigerant shortage
∗ Four way valve
∗ Water mixed
∗ Stop valve
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R15825)
Service Diagnosis
87
Troubleshooting
SiBE041134
4.17 High Pressure Control in Cooling
Remote
Controller
Display
F6
Method of
Malfunction
Detection
High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if
the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit.
Malfunction
Decision
Conditions
„ The temperature sensed by the outdoor heat exchanger thermistor rises above about
65°C.
„ The error is cleared when the temperature drops below about 50°C.
Supposed
Causes
„
„
„
„
„
„
„
The installation space is not large enough.
Dirty outdoor heat exchanger
Defective outdoor fan motor
Defective stop valve
Defective electronic expansion valve or coil
Defective outdoor heat exchanger thermistor
Defective outdoor unit PCB
Troubleshooting
Caution
Check No.01
Refer to P.101
Check No.12
Refer to P.103
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check the installation space.
Check No. 17
Check the installation
condition.
NG
OK
Check No.17
Refer to P.107
Check No. 19
Check the outdoor fan.
NG
OK
Check No.18
Refer to P.107
Check No. 18
Check the discharge
pressure.
NG
Change the installation
location or direction.
Clean the outdoor heat
exchanger.
Replace the outdoor fan
motor.
Reconnect the connector or
fan motor lead wires.
Replace the stop valve.
OK
Check No.19
Refer to P.108
Check No. 12
Check the electronic
expansion valve.
NG
OK
Check No. 01
Check the outdoor heat
exchanger thermistor.
NG
Replace the electronic
expansion valve or the coil.
Replace the outdoor unit
PCB.
Replace the outdoor heat
exchanger thermistor.
OK
Replace the outdoor unit
PCB.
(R15667)
88
Service Diagnosis
SiBE041134
Troubleshooting
4.18 Compressor System Sensor Abnormality
Remote
Controller
Display
H0
Method of
Malfunction
Detection
„ The system checks the DC current before the compressor starts.
Malfunction
Decision
Conditions
„ The DC current before compressor start-up is out of the range 0.5 ~ 4.5 V (sensor output
converted to voltage value)
„ The DC voltage before compressor start-up is below 50 V.
Supposed
Causes
„ Broken or disconnected harness
„ Defective outdoor unit PCB
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check the relay harness for the
compressor.
Is the harness broken?
YES
Replace the harness.
NO
Turn off the power and turn it on
again.
Restart operation
and error displayed
again?
YES
NO
No problem.
Keep on running.
Replace the outdoor unit
PCB.
(R11712)
Service Diagnosis
89
Troubleshooting
SiBE041134
4.19 Position Sensor Abnormality
Remote
Controller
Display
H6
Method of
Malfunction
Detection
A compressor start-up failure is detected by checking the compressor running condition through
the position detection circuit.
Malfunction
Decision
Conditions
„ If the error repeats, the system is shut down.
„ Reset condition: Continuous run for about 11 minutes without any other error
Supposed
Causes
„
„
„
„
„
90
Disconnection of the compressor relay cable
Defective compressor
Defective outdoor unit PCB
Start-up failure caused by the closed stop valve
Input voltage is outside the specified range.
Service Diagnosis
SiBE041134
Troubleshooting
Troubleshooting
Caution
Check No.15
Refer to P.105
Check No.18
Refer to P.107
Check No.20
Refer to P.108
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Turn off the power.
Check the power supply voltage.
Voltage as rated?
NO
Correct the power supply.
YES
Check No. 18
Check the discharge pressure.
OK?
NO
Replace the stop valve.
YES
Check No. 20
Check the short circuit of the diode
bridge.
Normal?
NO
Replace the outdoor unit
PCB.
YES
Check the connection.
Electrical
components or
compressor harnesses
connected as
specified?
NO
Reconnect the electrical
components or compressor
harnesses as specified.
YES
Turn on the power.
Check the electrolytic capacitor
voltage.
320 ± 50 VDC?
NO
Replace the outdoor unit
PCB.
YES
Turn off the power. Disconnect the
harnesses U, V, and W.
∗ Inverter checker
Check No.15
Check with the inverter checker (∗). Part No.: 1225477
Any LED OFF?
NO
YES
Correct the power supply
or replace the outdoor unit
PCB.
Replace the compressor.
(R15827)
Service Diagnosis
91
Troubleshooting
SiBE041134
4.20 DC Voltage / Current Sensor Abnormality
Remote
Controller
Display
H8
Method of
Malfunction
Detection
DC voltage or DC current sensor abnormality is identified based on the compressor running
frequency and the input current.
Malfunction
Decision
Conditions
„ If the error repeats, the system is shut down.
„ Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
„ Defective outdoor unit PCB
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Replace the outdoor unit PCB.
92
Service Diagnosis
SiBE041134
Troubleshooting
4.21 Thermistor or Related Abnormality (Outdoor Unit)
Remote
Controller
Display
H9, J3, J6, P4
Method of
Malfunction
Detection
This fault is identified based on the thermistor input voltage to the microcomputer.
A thermistor fault is identified based on the temperature sensed by each thermistor.
Malfunction
Decision
Conditions
„ The thermistor input voltage is above 4.96 V or below 0.04 V with the power on.
„ J3 error is judged if the discharge pipe temperature is lower than the heat exchanger
temperature.
Supposed
Causes
„ Disconnection of the connector for the thermistor
„ Defective thermistor corresponding to the error code
„ Defective heat exchanger thermistor in the case of J3 error (outdoor heat exchanger
thermistor in cooling operation, or indoor heat exchanger thermistor in heating operation)
„ Defective outdoor unit PCB
Troubleshooting
In case of “P4”
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Replace the outdoor unit PCB.
P4 : Radiation fin thermistor
Service Diagnosis
93
Troubleshooting
Troubleshooting
SiBE041134
In case of “H9” “J3” “J6”
Caution
Check No.01
Refer to P.101
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Turn on the power again.
Error displayed
again on remote
controller?
NO
Reconnect the connectors
or thermistors.
YES
Check No. 01
Check the thermistor resistance
value.
Normal?
J3 error: the discharge
pipe temperature is
lower than the heat
exchanger temperature.
Cooling: Outdoor heat
exchanger
temperature
Heating: Indoor heat
exchanger
temperature
NO
Replace the defective
thermistor(s) of the following
thermistors.
∗ Outdoor temperature
thermistor
∗ Discharge pipe thermistor
∗ Outdoor heat exchanger
thermistor
YES
Check No. 01
Check the indoor heat exchanger
thermistor resistance value in the
heating operation.
Indoor heat
exchanger thermistor
functioning?
NO
Replace the indoor heat
exchanger thermistor.
YES
Replace the outdoor unit
PCB.
(R16059)
H9 : Outdoor temperature thermistor
J3 : Discharge pipe thermistor
J6 : Outdoor heat exchanger thermistor
94
Service Diagnosis
SiBE041134
Troubleshooting
4.22 Electrical Box Temperature Rise
Remote
Controller
Display
L3
Method of
Malfunction
Detection
An electrical box temperature rise is detected by checking the radiation fin thermistor with the
compressor off.
Malfunction
Decision
Conditions
„ With the compressor off, the radiation fin temperature is above A°C.
„ The error is cleared when the radiation fin temperature drops below B°C.
„ To cool the electrical components, the outdoor fan starts when the radiation fin temperature
rises above C°C and stops when it drops below B°C.
A (°C)
98
Supposed
Causes
Service Diagnosis
„
„
„
„
„
B (°C)
75
C (°C)
83
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective outdoor unit PCB
95
Troubleshooting
SiBE041134
Troubleshooting
Caution
Check No.17
Refer to P.107
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
WARNING
To cool the electrical components,
the outdoor fan starts when the
radiation fin temperature rises
above C ˚C and stops when it
drops below B ˚C.
Turn off the power and turn it on
again.
Check No.19
Refer to P.108
YES
Error again or outdoor
fan activated?
NO
Check the radiation fin
temperature.
NO
Above A ˚C?
Replace the outdoor unit
PCB.
YES
Check No. 19
09
Check the outdoor fan or
related.
NG
fan motor.
Replace the outdoor
fan
motor.
Correct the connectors and
fan motor
wire.
Correct
thelead
connectors
Replace
the outdoor
unit
and
fan motor
lead wire.
PCB.
Replace
the outdoor unit
PCB.
OK
Too dirty
Radiation fin dirty?
Clean up the radiation fin.
Slightly dirty
Check No. 17
07
Check the installation condition.
(R13536)
(R14444)
96
A (°C)
B (°C)
C (°C)
98
75
83
Service Diagnosis
SiBE041134
Troubleshooting
4.23 Radiation Fin Temperature Rise
Remote
Controller
Display
L4
Method of
Malfunction
Detection
A radiation fin temperature rise is detected by checking the radiation fin thermistor with the
compressor on.
Malfunction
Decision
Conditions
„
„
„
„
If the radiation fin temperature with the compressor on is above A°C.
The error is cleared when the radiation fin temperature drops below B°C.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
A (°C)
98
Supposed
Causes
Service Diagnosis
„
„
„
„
„
„
B (°C)
78
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective outdoor unit PCB
Silicon grease is not applied properly on the radiation fin after replacing the outdoor unit
PCB.
97
Troubleshooting
SiBE041134
Troubleshooting
Caution
Check No.17
Refer to P.107
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Turn off the power and turn it on
again to start the system.
Check No.19
Refer to P.108
Error displayed again?
YES
the
PCBreplaced?
been
HasHas
PCB
been
replaced?
NO
YES
NO
∗ Silicon grease
Part No.: 1172698
Check the radiation fin
temperature.
Above A ˚C?
YES
Check No. 09
19
Check the outdoor fan or
related.
NG
OK
Radiation fin dirty?
Too dirty
the silicon
greaseon
Check if applied
properly
applied
properly
the
the
radiation
fin. on
If not,
radiation
If not,
apply(∗).
it
apply
the fin.
silicon
grease
(∗).
(See(See
Note.)
Note.)
NO
Replace
the
outdoor
unit
Check
the
power
transistor
PCB.the radiation fin for
and
looseness. If they are found
to be fit tightly, replace the
outdoor unit PCB or the
power transistor.
fan motor.
Replace the outdoor
fan
motor.
Correct the connectors and
fan motor
Correct
theleads.
connectors and
fan
motorthe
leads.
Replace
outdoor unit
Replace
the outdoor unit
PCB.
PCB.
Clean up the radiation fin.
Slightly dirty
Check No. 17
07
Check the installation condition.
(R13537)
(R16053)
A (°C)
98
Note:
98
Refer to “Application of silicon grease to a power transistor and a diode bridge” on page 170 for
detail.
Service Diagnosis
SiBE041134
Troubleshooting
4.24 Output Overcurrent Detection
Remote
Controller
Display
L5
Method of
Malfunction
Detection
An output overcurrent is detected by checking the current that flows in the inverter DC section.
Malfunction
Decision
Conditions
„ A position signal error occurs while the compressor is running.
„ A speed error occurs while the compressor is running.
„ An output overcurrent signal is fed from the output overcurrent detection circuit to the
microcomputer.
„ If the error repeats, the system is shut down.
„ Reset condition: Continuous run for about 11 minutes without any other error
Supposed
Causes
„
„
„
„
„
„
„
Service Diagnosis
Poor installation condition
Closed stop valve
Defective power module
Wrong internal wiring
Abnormal power supply voltage
Defective outdoor unit PCB
Defective compressor
99
Troubleshooting
SiBE041134
Troubleshooting
Caution
Check No.15
Refer to P.105
Check No.17
Refer to P.107
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output
overcurrent after the wires have been disconnected and reconnected for part replacement, check the
wiring again.
Check No. 17
Check the installation condition.
NO
Stop valve fully open?
Check No.18
Refer to P.107
Check No.22
Refer to P.109
Fully open the stop valve.
YES
Turn off the power and turn it on
again to start the system. See if the
same error occurs.
Error again?
NO Monitor the power supply voltage,
discharge and suction pressures,
and other factors for a long term.
YES
Possible causes
∗ Momentary fall of power supply
voltage
∗ Compressor overload
∗ Short circuit
Turn off the power and disconnect
the harnesses U, V, and W.
Check the connectors and
other components.
∗ Inverter checker
Part No.: 1225477
Check No.15
Check with the inverter checker (∗).
Any LED off?
Keep on using.
YES
Correct the power supply
or replace the outdoor unit
PCB.
NO
Check No. 22
Check the power module.
Normal?
NO
Replace the outdoor unit
PCB.
YES
Turn off the power, and reconnect
the harnesses. Turn on the power
again and start operation.
Check the power supply voltage.
Voltage as rated?
NO
Correct the power supply.
YES
Short circuit or
wire breakage between
compressor's coil
phases?
YES
Replace the compressor.
NO
Check No. 18
Check the discharge pressure.
(R15830)
100
Service Diagnosis
SiBE041134
Check
5. Check
5.1
Thermistor Resistance Check
Check No.01
Disconnect the connectors of the thermistors from the PCB, and measure the resistance of
each thermistor using tester.
The relationship between normal temperature and resistance is shown in the table and the
graphs below.
The data is for reference purpose only.
Thermistor temperature (°C)
Resistance (kΩ)
Room temperature thermistor
Other thermistors
–20
–15
73.4
57.0
197.8
148.2
–10
–5
44.7
35.3
112.1
85.60
0
5
28.2
22.6
65.93
51.14
10
15
18.3
14.8
39.99
31.52
20
25
12.1
10.0
25.02
20.00
30
35
8.2
6.9
16.10
13.04
40
45
5.8
4.9
10.62
8.707
50
4.1
7.176
(R25°C = 10 kΩ, B = 3435 K) (R25°C = 20 kΩ, B = 3950 K)
Other thermistors
Room temperature thermistor
(kΩ)
(kΩ)
150
50
100
25
50
0
–15
0
15
30
45
(˚C)
–15
0
15
30
45
(˚C)
(11952)
Tester
Resistance range
(R11906)
RTH1
Tester
(R3460)
„ The room temperature thermistor is directly mounted on the display PCB. Remove the
display PCB from the control PCB to measure the resistance.
„ When the indoor heat exchanger thermistor is soldered on the PCB, remove the thermistor
and measure the resistance.
Service Diagnosis
101
Check
5.2
SiBE041134
Fan Motor Connector Output Check
Check No.03
Š
1.
2.
3.
Fan motor wire breakdown / short circuit check
Check the connector for connection.
Turn the power off.
Check if each resistance at the phases U - V and V - W is 90 Ω ~ 100 Ω (between the pins
12 - 9, and between 9 - 6).
Š Motor control voltage check
1. Check the connector for connection.
2. Check the motor control voltage is generated (between the pins 2 - 3).
Š
1.
2.
3.
Rotation pulse check
Check the connector for connection.
Turn the power on and stop the operation.
Check if the Hall IC generates the rotation pulse 4 times when the fan motor is manually
rotated once (between the pins 1 - 3).
S200
Phase U
12
11
Free pin
10
Free pin
Phase V
9
8
Free pin
7
Free pin
6
Phase W
5
Free pin
4
Free pin
3
GND
2
Motor control voltage (15 VDC)
1
Rotation pulse (5 VDC)
(R11979)
5.3
Power Supply Waveforms Check
Check No.11
Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check
the waveform disturbance.
„ Check to see if the power supply waveform is a sine wave. (Fig.1)
„ Check to see if there is waveform disturbance near the zero cross. (sections circled in Fig.2)
Fig.1
102
Fig.2
Service Diagnosis
SiBE041134
5.4
Check
Electronic Expansion Valve Check
Check No.12
Conduct the followings to check the electronic expansion valve (EV).
1. Check to see if the EV connector is correctly connected to the PCB.
2. Turn the power off and on again, and check to see if the EV generates a latching sound.
3. If the EV does not generate a latching sound in the above step 2, disconnect the connector
and check the continuity using a tester.
4. Check the continuity between the pins 1 - 6, 2 - 6, 3 - 6, and 4 - 6. If there is no continuity
between the pins, the EV coil is faulty.
Harness 5P
S20
(5)
6P Connector
1 2 3 4 5 6
Check
6-1
6-2
6-3
6-4
(R14212)
5. If the continuity is confirmed in step 3, the outdoor unit PCB is faulty.
Note:
Service Diagnosis
Please note that the latching sound varies depending on the valve type.
103
Check
5.5
SiBE041134
Four Way Valve Performance Check
Check No.13
Turn the power off and then on
again.
Start heating operation.
S80
voltage at 220 - 240
VAC with compressor
on? (Fig. 1)
∗ Four way valve coil
Cooling / Dry : No continuity
Heating : Continuity
NO
Replace the outdoor unit
PCB.
YES
Disconnect the four way valve coil
from the connector and check the
continuity.
Four way
valve coil resistance at
1000 ~ 2000 Ω?
NO
Replace the four way valve
coil.
YES
Replace the four way valve.
(R15737)
(Fig. 1)
Voltage at S80
220 - 240 VAC
Time
Compressor
ON
5.6
(R11904)
Inverter Units Refrigerant System Check
Check No.14
Refrigerant system check
Is the
discharge pipe
thermistor disconnected
from the holder?
YES
Reconnect the thermistor.
NO
Check for refrigerant leakage.
See the service diagnosis on
refrigerant shortage (U0).
Replace the refrigerant.
(R15833)
104
Service Diagnosis
SiBE041134
5.7
Check
“Inverter Checker” Check
Check No.15
„ Characteristics
If an abnormal stop occurs due to compressor startup failure or overcurrent output when using
an inverter unit, it is difficult to judge whether the stop is caused by the compressor failure or
some other failure (control PCB, power module, etc.). The inverter checker makes it possible to
judge the cause of trouble easily and securely. (Connect this checker as a quasi-compressor
instead of compressor and check the output of the inverter)
„ Operation Method
Step 1
Be sure to turn the power off.
Step 2
Install the inverter checker instead of a compressor.
Note:
Make sure the charged voltage of the built-in smoothing electrolytic capacitor drops to 10
VDC or below before carrying out the service work.
(1) Remove the terminals from
the compressor.
(2) Connect the terminals to the
terminals of the inverter
checker.
Compressor
Inverter checker
Be careful not to let the terminals (U,V,W)
touch each other. Otherwise, high voltage
is applied.
(R14926)
Reference:
If the terminals of the compressor are not FASTON terminals (difficult to remove the wire on
the terminals), it is possible to connect wires available on site to the outdoor unit from output
side of PCB. (Do not connect them to the compressor at the same time, otherwise it may
result in incorrect detection.)
Step 3
Activate the power transistor test operation from the outdoor unit.
1) Press the forced cooling operation [ON/OFF] button for 5 seconds.
(Refer to page 165 for the position.)
→ Power transistor test operation starts.
Service Diagnosis
105
Check
SiBE041134
„ Diagnose method (Diagnose according to 6 LEDs lighting status.)
(1) If all the LEDs are lit uniformly, the compressor is defective.
→ Replace the compressor.
(2) If the LEDs are not lit uniformly, check the power module.
→ Refer to Check No.22.
(3) If NG in Check No.22, replace the power module.
(Replace the main PCB. The power module is united with the main PCB.)
If OK in Check No.22, check if there is any solder cracking on the PCB.
(4) If any solder cracking is found, replace the PCB or repair the soldered section.
If there is no solder cracking, replace the PCB.
Caution
(1) When the output frequency is low, the LEDs blink slowly. As the output frequency increases,
the LEDs blink quicker. (The LEDs look like they are lit.)
(2) On completion of the inverter checker diagnosis, be sure to re-crimp the FASTON terminals.
Otherwise, the terminals may be burned due to loosening.
Direction of crimp
This size is shortened
by the crimp.
FASTON terminal
(R15292)
5.8
Rotation Pulse Check on the Outdoor Unit PCB
Check No.16
1. Check that the voltage between the pins 10 - 11 is 15 VDC.
2. Check if the Hall IC generates the rotation pulse (0 ~ 15 VDC) 4 times between the pins 10 12, 10 - 13, when the fan motor is manually rotated once.
S70
13
HV (Hall IC)
12
HU (Hall IC)
11
15 VDC
10
9
Free pin
8
Free pin
Phase W
7
6
Free pin
5
Free pin
Phase V
4
3
Free pin
2
Free pin
1
Phase U
(R11907)
106
Service Diagnosis
SiBE041134
5.9
Check
Installation Condition Check
Check No.17
Installation condition check
Check the allowable
dimensions of the air
suction and
discharge area.
Abnormal
Change the installation
location or direction.
Normal
Is the discharged air
short-circuited?
YES
Change the installation
location or direction.
NO
Is the outdoor heat
exchanger very dirty?
YES
Clean the outdoor heat
exchanger.
NO
Is the airflow blocked by
obstacles or winds
blowing in the opposite
direction?
YES
NO
Change the installation
location or direction.
Check the outdoor temperature.
(The outdoor temperature
should be 46˚C or lower.)
(R9459)
5.10 Discharge Pressure Check
Check No.18
Discharge pressure check
High?
NO
Replace the compressor.
YES
Is the stop valve open?
NO
Open the stop valve.
YES
Is the connection pipe
deformed?
YES
Replace the pipe installed at
the site.
NO
Is the air
filter or indoor / outdoor
heat exchanger
dirty?
Not dirty
Dirty
Clean the dirty air filter or
indoor / outdoor heat
exchanger.
Replace the compressor.
(R15738)
Service Diagnosis
107
Check
SiBE041134
5.11 Outdoor Fan System Check
Check No.19
DC motor
Check the outdoor fan system.
Fan motor
lead wire connector
disconnected?
NO
Outdoor fan running?
YES
YES
Reconnect the connector.
NO
Go to Check No. 16.
Outdoor fan system is functioning.
(R15001)
5.12 Main Circuit Short Check
Check No.20
Note:
Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
0 V before checking.
„ Measure the resistance between the pins of the DB1 referring to the table below.
„ If the resistance is ∞ or less than 1 kΩ, short circuit occurs on the main circuit.
Resistance is OK.
Resistance is NG.
~ (2, 3)
+ (4)
~ (2, 3)
– (1)
+ (4)
~ (2, 3)
– (1)
~ (2, 3)
several kΩ
~ several MΩ
0 Ω or ∞
∞
∞
0
0
several kΩ
~ several MΩ
0 Ω or ∞
2
3
4
– ~ ~ +
1
– +
Negative (–) terminal of
tester (positive terminal
(+) for digital tester)
Positive (+) terminal of
tester (negative terminal
(–) for digital tester)
Tester
(R12035)
108
Service Diagnosis
SiBE041134
Check
5.13 Power Module Check
Check No.22
Note:
Check to make sure that the voltage between (+) and (–) of the power module is approx. 0 V
before checking.
„ Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
connector, press the protrusion on the connector.
„ Follow the procedure below to measure resistance between the terminals of the power
module and the terminals of the compressor with a multi-tester. Evaluate the measurement
results referring to the following table.
Negative (–) terminal of
tester (positive terminal
(+) for digital tester)
Positive (+) terminal of
tester (negative terminal
(–) for digital tester)
Resistance is OK.
Resistance is NG.
Power module
(+)
UVW
Power module
(–)
UVW
UVW
Power module
(+)
UVW
Power module
(–)
several kΩ ~ several MΩ
0 Ω or ∞
Power module
(R16069)
Service Diagnosis
109
SiBE041134
Part 7
Removal Procedure
1. Indoor Unit...........................................................................................111
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
Removal of Air Filters ...........................................................................111
Removal of Horizontal Blade................................................................113
Removal of Front Panel........................................................................115
Removal of Front Grille ........................................................................116
Removal of Vertical Blade ASSYs........................................................117
Removal of Electrical Box ....................................................................119
Removal of Swing Motor / PCBs ..........................................................122
Removal of Indoor Heat Exchanger .....................................................127
Removal of Fan Rotor / Fan Motor.......................................................130
Exchange of Piping Direction (Drain Hose)..........................................133
2. Outdoor Unit........................................................................................134
2.1
2.2
2.3
2.4
2.5
2.6
2.7
110
Removal of Outer Panels / Fan Motor..................................................134
Removal of Electrical Box ....................................................................143
Removal of PCBs .................................................................................146
Removal of Reactor / Partition Plate ....................................................154
Removal of Sound Blankets .................................................................156
Removal of Four Way Valve.................................................................158
Removal of Compressor.......................................................................161
Removal Procedure
SiBE041134
Indoor Unit
1. Indoor Unit
1.1
Removal of Air Filters
Procedure
Step
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Points
1. Appearance features
Warning
Dangerous: High voltage
A high voltage is applied to
all the electric circuits of this
product including
thermistors.
Room temperature thermistor
(R16654)
Signal receiver
Operation
lamp
TIMER
lamp
INTELLIGENT
EYE lamp
„ When a signal from the
remote controller is
received, the receiving tone
sounds and the operation
lamp flickers immediately to
confirm the signal reception.
„ When the [ON/OFF] button
is kept pressed for 5
seconds, the forced cooling
operation is performed for
about 15 minutes.
[ON/OFF] button
(Forced cooling operation [ON/OFF] button)
(R16655)
2. Remove the air filters.
1 Open the front panel to
the position where it
stops.
Front panel
(R16656)
2
Slightly push up the
center of the air filter to
unfasten the 2 hooks.
Air filter
Hook
(R16657)
Removal Procedure
„ The air filter is not marked
for difference between the
right and left sides.
„ The air filter can be set
easily by inserting it along
the guides.
„ Insert the air filter with the
“FRONT” mark faced up.
„ Be sure to insert the hooks
(at 2 lower positions) when
mounting the air filter.
111
Indoor Unit
Step
3 Pull out the air filter
SiBE041134
Procedure
Points
downward and remove
it.
(R16658)
3. Remove the Titanium
apatite photocatalytic
air-purifying filters.
1 The Titanium apatite
photocatalytic airpurifying filter is
attached to the back of
the air filter.
Air filter
Titanium apatite
photocatalytic
air-purifying filter
(R8025)
2
Remove the Titanium
apatite photocatalytic
air-purifying filter frame
by bending the air filter
and unfastening the
projections from the air
filter frame.
Projection
(R14599)
3
„ To prevent the damage, do
not remove the Titanium
apatite photocatalytic airpurifying filter from the frame
when cleaning it.
Remove the Titanium
apatite photocatalytic
air-purifying filter from
its frame (at 5 positions)
by bending it.
„ The Titanium apatite
photocatalytic air-purifying
filter is not marked for
difference between the right
and left sides.
Hook
(R8027)
112
Removal Procedure
SiBE041134
1.2
Indoor Unit
Removal of Horizontal Blade
Procedure
Warning
Step
1
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Points
Open the horizontal
blade.
Horizontal blade
(R16659)
2
„ The center shaft can be
released easily by bending
the blade.
Unfasten the center
shaft while bending the
horizontal blade
slightly.
(R16660)
Cautions for reassembling
1. Since the key pattern hook
is provided, rotate the
horizontal blade and fit it to
the right shaft first.
2. Fit the horizontal blade to
the center and left shafts.
Shaft
(R16661)
3
4
Unfasten the left shaft
of the horizontal blade.
Right
Left
Unfasten the right shaft
of the horizontal blade.
Key pattern hook
Shaft
(R16662)
Removal Procedure
113
Indoor Unit
Step
5 Remove the horizontal
SiBE041134
Procedure
Points
blade.
(R16663)
114
Removal Procedure
SiBE041134
1.3
Indoor Unit
Removal of Front Panel
Procedure
Warning
Step
1
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Open the front panel
over the position where
it stops.
Points
Right side
Front panel
Left side
(R16664)
2
Release the right rotary
shaft.
Right
„ The rotary shaft on each
side can be released easily
by sliding each shaft inward.
Rotary shaft
(R16665)
3
Release the left rotary
shaft.
Left Rotary shaft
Rotary shaft
(R16666)
4
„ When reassembling the
front panel, fit the right and
left rotary shafts one by one
into the grooves and fully
push them in position.
Remove the front panel.
(R16667)
Removal Procedure
115
Indoor Unit
1.4
SiBE041134
Removal of Front Grille
Procedure
Warning
Step
1
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Points
Remove the 2 screws,
which fix the front grille
to the main body.
Front grille
(R16668)
2
The front grille has 3
hooks on the upper
part.
„ Refer to the removal
procedure in a reverse way
when reassembling.
Hook
(R16669)
3
Press each hook, and
also lift the grille up to
unfasten the hooks.
Left
Center
Right
(R16670)
4
Pull the upper part of
the front grille out and
lift the lower part up,
and then remove the
front grille.
Left
Center
„ The convex marks (...) on
the front panel indicate the
position of the hooks.
Right
(R12715)
„ When reassembling, make
sure that all the 3 hooks are
fastened as they were.
(R16671)
116
Removal Procedure
SiBE041134
1.5
Removal of Vertical Blade ASSYs
Procedure
Step
1
Indoor Unit
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Points
Unfasten the right and
left hooks of the fan
guard with pliers.
„ Narrow the edges of the
hook to unfasten it.
Hook
Hook
Hook
(R11646)
Fan guard
2
(R14608)
„ Repeat the same procedure
to remove the fan guard on
the other side.
Unfasten the 4 hooks at
the bottom. Remove the
fan guard.
Hook
(R11647)
3
Unfasten the hooks at
the upper 2 positions.
„ A vertical blade ASSY has 6
fins. It is impossible to
replace only one fin.
Hook
„ The vertical blade ASSY is
not marked for difference
between right and left.
Vertical blade ASSY
(R8020)
(R8021)
Removal Procedure
117
Indoor Unit
Step
4 Unfasten the 3 hooks at
SiBE041134
Procedure
Points
the shaft mounting part
by pressing them with a
flat screwdriver.
Hook
(R8022)
5
„ Repeat the same procedure
to remove the vertical blade
ASSY on the other side.
Remove the vertical
blade ASSY.
(R8023)
118
Removal Procedure
SiBE041134
1.6
Indoor Unit
Removal of Electrical Box
Procedure
Step
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
1. Disconnect the connecting
wires.
1 Remove the screw of
the service cover.
Points
Preparation
„ Remove the front grille
according to the “Removal
of Front Grille”.
Service cover
(R16672)
2
Pull out the service
cover down in the
direction of the arrow.
(R16673)
3
The figure shows the
connections of wire
harnesses.
Terminal board
Electrical box
Indoor heat exchanger thermistor
Wire retaining plate
(R14586)
Removal Procedure
119
Indoor Unit
Step
4 Remove the screw of
SiBE041134
Procedure
Points
the wire retaining plate.
(R12044)
5
Remove the screws of
the terminal board and
disconnect the
connecting wires.
„ Connecting wires
(1): black
(2): white
(3): red
( ): yellow / green
Terminal board
Connecting
wires
(R11639)
6
Pull out the indoor heat
exchanger thermistor.
Indoor heat exchanger thermistor
„ Take care not to lose the clip
of thermistor.
Clip
Thermistor
(R11268)
(R12045)
2. Remove the electrical box.
1 Remove the screw and
release the ground
wire.
Screw
Ground
wire
(R16648)
120
Removal Procedure
SiBE041134
Step
2 Disconnect the
connector for the fan
motor [S200].
Release the fan motor
harnesses from the
hook.
Indoor Unit
Procedure
Points
[S200]
Hook
(R15844)
3
(R16649)
Remove the screw of
the electrical box.
(R12048)
4
Slide the electrical box
to the right first and
detach the horizontal
blade from the electrical
box.
5
Pull the electrical box.
(R15845)
„ There is a hook on the
bottom frame. When
reassembling, fit the rear
side of the electrical box to
the hook.
Bottom frame
Hook
(R11657)
Removal Procedure
121
Indoor Unit
1.7
SiBE041134
Removal of Swing Motor / PCBs
Procedure
Step
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Points
1. Remove the shield plate
(2).
1 Unfasten the hooks at
the upper 2 positions of
the shield plate (2).
Preparation
„ Remove the electrical box
according to the “Removal
of Electrical Box”.
Shield plate (2)
Electrical box
Hook
2
(R14603)
Unfasten the hook at
the lower position,
and remove the shield
plate (2).
Hook
(R16650)
2. Remove the swing motor.
1 Remove the screw of
the swing motor.
Swing motor
(R11650)
122
Removal Procedure
SiBE041134
Step
2 Unfasten the hook, and
Indoor Unit
Procedure
Points
„ The connector of the swing
motor has a hook.
Press the hook with a flat
screwdriver to unfasten it.
disconnect the
connector.
(R8037)
(R14847)
3. Remove the PCBs.
1 Unfasten the hook, and
release the display PCB
ASSY.
Hook
Display PCB ASSY
(R16674)
2
Remove the
INTELLIGENT EYE
fixing plate by twisting
it.
INTELLIGENT
EYE fixing plate
(R16675)
3
Unfasten the 3 hooks
and remove the
INTELLIGENT EYE
sensor PCB.
(R16652)
Removal Procedure
123
Indoor Unit
Step
4 Disconnect the
SiBE041134
Procedure
Points
connector [S36] from
the INTELLIGENT EYE
sensor PCB.
[S36]
(R16676)
5
Turn over the display
PCB ASSY, and
unfasten the 3 hooks to
remove the display
PCB.
Display PCB
(rear side)
(R16651)
6
Disconnect the
connector [S27] from
the display PCB.
7
The figure shows the
component parts of the
display PCB.
[S27]: for control PCB
[S27]
[ON/OFF] button
Operation lamp
TIMER lamp
Signal receiver
(R14848)
124
Removal Procedure
SiBE041134
Step
Procedure
4. Remove the control PCB.
1 Lift the shield plate (1)
and unfasten the 2
hooks.
2
Indoor Unit
Points
Hook
Slide the shield plate
(1) and remove it.
Shield plate (1)
(R12061)
3
Release the harnesses
from the hooks.
(R12062)
4
1 : black, upper
2 : white, lower
3 : red, upper
: green/yellow, upper
green, lower
Disconnect the
terminals from the
terminal board with
pliers.
(R14609)
Removal Procedure
125
Indoor Unit
SiBE041134
Step
5 Release the 4 hooks.
Procedure
Points
Hook
Lift up the upper part of
the control PCB and
remove it.
Control
PCB
Hook
6
(R16677)
„ Refer to page 7 for detail.
The figure shows the
control PCB.
[S32]
[S200]
[S26]
[S6]: swing motor
[S25]: INTELLIGENT EYE
sensor PCB
[S26]: display PCB
[S32]: indoor heat exchanger
thermistor
[S200]: fan motor
[S6]
[S25]
(R16653)
126
Removal Procedure
SiBE041134
1.8
Indoor Unit
Removal of Indoor Heat Exchanger
Procedure
Step
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Points
1. Disconnect the refrigerant
piping.
1 Remove the screws
which fix the indoor unit
to the installation plate.
Preparation
„ Remove the electrical box
according to the “Removal
of Electrical Box”.
(R12174)
2
Lift the indoor unit with
a wooden base.
Caution
Be sure to stop the
compressor before
disconnecting the refrigerant
pipe. If the refrigerant pipe is
disconnected with the
compressor running and the
stop valve opened, air may be
sucked in to generate an
over-pressure in refrigeration
cycle, thus resulting in pipe
rupture or accidental injury.
„ If the drain hose is
embedded in the wall,
disconnect the drain hose
beforehand.
Wooden base
(R12175)
3
„ Place a plastic sheet under
the drain hose as remaining
drain may leak.
Pull out the drain hose.
Drain hose
Extension drain hose
Connecting wires
4
(R12176)
„ Carry out the removal work
with 2 wrenches.
Disconnect the flare nut
for gas piping.
Caution
From the viewpoint of global
environmental protection,
make sure to use a vacuum
pump for air purging.
(R12177)
Removal Procedure
„ When the pipings are
disconnected, protect the
both openings from entering
moisture.
127
Indoor Unit
Step
5 Disconnect the flare nut
SiBE041134
Procedure
Points
for liquid piping.
(R12178)
2. Remove the indoor heat
exchanger.
1 Remove the indoor unit
from the installation
plate.
Liquid piping
Gas piping
2
Unfasten the hook of
the piping fixture on the
back of the indoor unit.
(R12179)
Auxiliary piping
Piping fixture
(R8038)
(R8039)
128
Removal Procedure
SiBE041134
Indoor Unit
Step
3 Widen the auxiliary
Procedure
piping to the extent of
10° ~ 20°.
Points
Auxiliary piping
(R8040)
4
Remove the screw on
the left side and
unfasten the hook on
the rear side.
Hook
Caution
When removing or
reassembling the indoor heat
exchanger, be sure to wear
gloves or wrap it with cloth
before proceeding to the
work. (You may be injured by
the fins.)
Hook
Screw
(R11269)
5
Push and unfasten the
hook on the right side
and lift up the indoor
heat exchanger.
(R8041)
Hook
(R8042)
6
Pull the indoor heat
exchanger to the front
side to unfasten the
hooks completely, and
then remove it.
Indoor heat
exchanger
(R8043)
Removal Procedure
129
Indoor Unit
1.9
SiBE041134
Removal of Fan Rotor / Fan Motor
Procedure
Step
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Points
1. Remove the right side
panel.
1 Remove the screw of
the right side panel.
Preparation
„ Remove the indoor heat
exchanger according to the
“Removal of Indoor Heat
Exchanger”.
Right side panel
(R8044)
2
Unfasten the hook of
the right side panel.
Hook
3
(R8045)
Remove the right side
panel.
(R8046)
130
Removal Procedure
SiBE041134
Step
Indoor Unit
Procedure
2. Remove the fan rotor and
the fan motor.
1 The fan motor has 3
projections on the right
side.
The fan rotor has a
rotating shaft on the left
side.
Points
Fan rotor
Fan motor
(R8047)
2
Remove the fan rotor.
(R8048)
3
Press the bearing from
outside.
4
Remove the bearing.
Bearing
(R8049)
(R8050)
Removal Procedure
131
Indoor Unit
Step
5 Unfasten the 2 hooks of
the motor cover.
SiBE041134
Procedure
Points
Hook
Motor cover
(R8051)
6
Pull out the fan motor
from the fan rotor to
remove.
Magnet
Fan motor
Coil
„ The magnet of the fan motor
is united with the fan rotor.
Be careful not to attract
metal waste to the magnet.
Keep away from the
materials that can be
affected by magnetic force
also.
(R8052)
(R8053)
132
Removal Procedure
SiBE041134
Indoor Unit
1.10 Exchange of Piping Direction (Drain Hose)
Procedure
Step
1
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Points
Remove the heat
insulation fixing screw
on the right side and
remove the drain hose.
Drain hose
Heat insulation fixing screw
(R8054)
(R8055)
2
Remove the drain plug
located at the left side
with pliers and insert
the removed drain plug
into the right side with a
hexagonal wrench (4
mm).
Drain plug
(R8056)
3
Insert the drain hose to
the left side, and tighten
it with the heat
insulation fixing screw.
Caution
Do not thrust in the drain
plug with a sharp-pointed
tool like a screwdriver. (The
drain plug may be broken,
resulting in water leakage.)
Drain piping (left)
(R8057)
Removal Procedure
„ After removing the drain
hose, to prevent water
leakage, make sure to
mount the heat insulation
fixing screw as it was.
133
Outdoor Unit
SiBE041134
2. Outdoor Unit
2.1
Removal of Outer Panels / Fan Motor
Procedure
Step
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Points
1. Appearance features
DAIKIN
INVERTER
(R7186)
„ Take care not to cut your
finger by the fins of the
outdoor heat exchanger.
(R11890)
2. Remove the panels.
1 Remove the screw of
the stop valve cover.
Pull down the stop
valve cover and remove
it.
Stop
valve
cover
(R7188)
Shield plate
„ The stop valve cover is
united with the shield plate.
„ When reassembling, make
sure to fit the 5 hooks.
Hooks
(R7189)
134
Removal Procedure
SiBE041134
Procedure
Step
2
Outdoor Unit
Remove the 2 screws
and lift the top panel.
Points
Top panel
DAIKIN
INVERTER
(R7190)
3
Remove the drip proof
plate.
Drip proof plate
DAIKIN
INVERTE
R
(R7191)
4
Remove the 4 screws
and remove the
discharge grille.
DAIKIN
INVERTER
Discharge
grille
(R7192)
„ The discharge grille has 4
hooks.
(R7193)
Removal Procedure
135
Outdoor Unit
Procedure
Step
5
SiBE041134
Points
Remove the 8 screws
of the front panel.
DAIKIN
INVERTE
R
Front panel
6
(R11825)
„ The front panel has 4 hooks.
Unfasten the hooks.
Pull and remove the
front panel.
Hook
(R11826)
136
Removal Procedure
SiBE041134
Outdoor Unit
Procedure
Step
Points
„ Nut size: M6
3. Remove the fan motor.
1 Remove the nut of the
outdoor fan.
10 mm
(R12236)
Outdoor fan
2
(R14205)
„ When reassembling, align
the
mark of the outdoor
fan with the D-cut section of
the motor shaft.
Remove the outdoor
fan.
D-cut
(R11828)
3
Release the outdoor
temperature thermistor.
Outdoor temperature
thermistor
Removal Procedure
(R11829)
137
Outdoor Unit
Procedure
Step
4
SiBE041134
Points
Disconnect the
connector for the fan
motor [S70].
(R16678)
[S70]
5
Release the fan motor
lead wire from the hook.
Fan motor
lead wire
(R11832)
138
Removal Procedure
SiBE041134
Procedure
Step
6
Outdoor Unit
Points
Remove the screw and
remove the fan motor
fixing frame.
Fan motor fixing frame
(R11833)
(R12314)
„ When reassembling, fit the
lower hooks into the bottom
frame.
(R7206)
Removal Procedure
139
Outdoor Unit
Procedure
Step
7
SiBE041134
Points
„ When reassembling, put the
fan motor lead wire through
the back of the fan motor
(so as not to be entangled
with the outdoor fan).
Open the hooks and
release the fan motor
lead wire.
(R11835)
Lead wire
Outdoor fan
(R3249)
8
Remove the 4 screws
and remove the fan
motor.
Fan motor
(R12311)
4. Remove the right side
panel.
1 Remove the 2 screws
on the rear side.
(R12162)
140
Removal Procedure
SiBE041134
Procedure
Step
2
Outdoor Unit
Remove the 4 screws
on the right side panel.
Points
Right side panel
(R12163)
3
Remove the screw near
the stop valves.
4
Unfasten the hook on
the rear side.
(R11839)
„ When reassembling, make
sure to fit the hook.
(R11842)
Removal Procedure
141
Outdoor Unit
Procedure
Step
5
SiBE041134
Points
„ When reassembling, make
sure to fit the hook.
Lift up the right side
panel and remove it.
Hook
(R12272)
6
Lift up the guard net
and remove it.
Guard net
(R11841)
142
Removal Procedure
SiBE041134
2.2
Removal of Electrical Box
Procedure
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Step
1
Outdoor Unit
Points
Preparation
„ Remove the panels and
disconnect the connector for
the fan motor according to
the “Removal of Outer
Panels / Fan Motor”.
Disconnect the
connector for the
overload protector
[S40].
[S40]
(R11846)
2
Disconnect the
connector for the four
way valve coil [S80].
[S80]
(R11848)
3
„ The colors of the harnesses
(white or brown) do not
matter to the position of the
connector.
Disconnect the 2
connectors for the
reactor.
(R11844)
Removal Procedure
143
Outdoor Unit
Procedure
Step
4
SiBE041134
Points
Disconnect the relay
connector for the
compressor.
(R11845)
5
Disconnect the
connector for the
electronic expansion
valve coil [S20].
[S20]
(R11847)
6
Cut the clamp.
(R11850)
7
„ Be careful not to lose the clip
for the thermistor.
Pull out the outdoor
heat exchanger
thermistor.
Clip
Outdoor heat
exchanger thermistor
(R11851)
144
Removal Procedure
SiBE041134
Procedure
Step
8
Outdoor Unit
Points
„ Be careful not to lose the clip
for the thermistor.
Release the discharge
pipe thermistor.
Clip
(R12279)
Discharge pipe thermistor
9
Lift and remove the
electrical box.
(R11849)
Electrical Box
(R11852)
Removal Procedure
145
Outdoor Unit
2.3
SiBE041134
Removal of PCBs
Procedure
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Step
Points
„ You can remove the main
PCB when you disconnect
the lead wires on the
terminal board without
removing the electrical box.
1. Remove the main PCB.
1 Feature of the main
PCB
(R11853)
2
Remove the screw on
the terminal board.
Terminal
board
(R11854)
3
Remove the 2 screws
and detach the ground
wires.
Ground
wire
(R11855)
146
Removal Procedure
SiBE041134
Procedure
Step
4
Outdoor Unit
Points
„ Be careful of a sharp
protrusion at the back of the
forced operation button
PCB.
Pull out the forced
operation button PCB.
Disconnect the
connector [S110] and
remove the forced
operation button PCB.
[S110]
Forced operation button PCB
(R16447)
5
Disconnect the relay
connector.
(R11857)
6
Cut the clamp.
(R11858)
Removal Procedure
147
Outdoor Unit
Procedure
Step
7
SiBE041134
Points
Release the harness.
(R11859)
8
Cut the clamps at the 2
locations.
(R11860)
9
Disconnect the
connector for the filter
PCB [S10].
[S10]
148
(R11861)
Removal Procedure
SiBE041134
Procedure
Step
10
Outdoor Unit
Disconnect the
connectors for the
magnetic relay [S50]
and for the forced
operation button PCB
[S100].
Points
[S100]
[S50]
11
Disconnect the
connector for the filter
PCB [HL3] [HN3].
(R11862)
[HN3]
[HL3]
(R11863)
12
Release the harnesses
from the hook.
(R11864)
13
Release the harness for
the outdoor
temperature thermistor.
(R11865)
Removal Procedure
149
Outdoor Unit
SiBE041134
Procedure
Step
14
Remove the 6 screws.
15
Unfasten the 4 hooks
and remove the main
PCB.
Points
(R11866)
(R11867)
„ Refer to page 9 for detail.
[S50]
[S100]
[HN3]
[HL3]
[S80]
[S20]
[S40]
[S10] [HL3] [HN3]: filter PCB
[S20]: electronic expansion
valve coil
[S40]: overload protector
[S50]: magnetic relay
[S70]: fan motor
[S80]: four way valve coil
[S90]: thermistors
[S100]: forced operation button
PCB
[S70]
[S90]
[S10]
(R11868)
150
Removal Procedure
SiBE041134
Outdoor Unit
Procedure
Step
Points
2. Remove the filter PCB.
1 Release the harnesses
from the hook.
Filter PCB
2
(R11869)
Cut the clamp.
(R11871)
3
Release the harnesses
from the hook.
(R11872)
Removal Procedure
151
Outdoor Unit
Procedure
Step
4
SiBE041134
Points
Release the harnesses
from the hooks.
(R11873)
5
Remove the screw.
(R11874)
6
Unfasten the 2 hooks.
Filter PCB
7
(R11876)
Lift and pull out the filter
PCB.
(R11877)
152
Removal Procedure
SiBE041134
Procedure
Step
8
Outdoor Unit
Points
„ Refer to page 9 for detail.
Feature of the filter
PCB
(R11878)
Removal Procedure
153
Outdoor Unit
2.4
SiBE041134
Removal of Reactor / Partition Plate
Procedure
Step
1. Remove the reactor.
1 Remove the screw and
remove the reactor.
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Points
Preparation
„ Remove the outer panels
according to the “Removal of
Outer Panels / Fan Motor”.
„ Remove the electrical box
according to the “Removal of
Electrical Box”.
Reactor
(R11879)
(R11880)
2. Remove the partition
plate.
1 Remove the 2 screws.
Partition plate
(R12273)
154
Removal Procedure
SiBE041134
Procedure
Step
2
Outdoor Unit
Points
The partition plate has
a hook on the lower
side. Lift and pull the
partition plate to
remove.
(R12280)
„ When reassembling, fit the
lower hook into the bottom
frame.
(R11883)
Removal Procedure
155
Outdoor Unit
2.5
Removal of Sound Blankets
Procedure
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Step
1
SiBE041134
Points
„ Since the piping ports are
torn easily, remove the
sound blanket carefully.
Remove the sound
blanket (top).
Sound blanket
(top)
(R11884)
2
Untie the string and
open the sound blanket
(outer).
Sound blanket
(outer)
3
(R11885)
Lift and remove the
sound blanket (outer).
(R11886)
156
Removal Procedure
SiBE041134
Procedure
Step
4
Outdoor Unit
Points
Pull the sound blanket
(inner) out.
Sound blanket
(inner)
(R11887)
5
Pull the sound blanket
(bottom) out.
Sound blanket
(bottom)
Removal Procedure
(R11888)
157
Outdoor Unit
2.6
Removal of Four Way Valve
Procedure
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Step
1
SiBE041134
Points
Pull out the electronic
expansion valve coil.
Electronic
expansion
valve coil
(R7233)
2
Remove the terminal
cover.
Terminal cover
(R7234)
Disconnect the lead
wires of the
compressor.
Red (U)
W
V
Yellow (V)
U
3
Blue (W)
(R7235)
158
Removal Procedure
SiBE041134
Procedure
Step
4
Outdoor Unit
Remove the screw and
remove the four way
valve coil.
Points
Four way valve coil
Warning
Be careful not to get yourself
burnt with the pipes and other
parts that are heated by the
gas brazing machine.
Warning
If the refrigerant gas leaks
during work, ventilate the
room. (If the refrigerant gas is
exposed to flames, toxic gas
may be generated.)
(R7247)
5
Remove the sheets of
putty.
(R7248)
„ Before working, make
sure that the refrigerant
gas is empty in the circuit.
„ Be sure to apply nitrogen
replacement when
heating up the brazed
part.
6 Heat up the brazed part
and withdraw the piping
with pliers.
Four way valve
Caution
From the viewpoint of global
environment protection, do
not discharge the refrigerant
gas in the atmosphere. Make
sure to collect all the
refrigerant gas.
Cautions for restoration
1. Restore the piping by nonoxidation brazing.
2. It is required to prevent the
carbonization of the oil inside
the four way valve and the
deterioration of the gaskets
affected by heat. (Keep
below 120°C.) For the sake
of this, wrap the four way
valve with wet cloth and
provide water so that the
cloth does not dry.
In case of difficulty with gas
brazing machine
1. Disconnect the brazed part
where is easy to disconnect
and restore.
2. Cut pipes on the main unit
with a tube cutter in order to
make it easy to disconnect.
(R7249)
Removal Procedure
159
Outdoor Unit
Step
SiBE041134
Procedure
Points
Note:
„ Do not use a metal saw for
cutting pipes by all means
because the sawdust comes
into the circuit.
„ When withdrawing the pipes,
be careful not to pinch them
firmly with pliers. The pipes
may get deformed.
(R7250)
160
„ Provide a protective sheet or
a steel plate so that the
brazing flame cannot
influence peripheries.
Removal Procedure
SiBE041134
2.7
Removal of Compressor
Procedure
Warning
Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Procedure
Step
1
Outdoor Unit
Points
Remove the 2 nuts of
the compressor.
Warning
Be careful not to get yourself
burnt with pipes and other
parts that are heated by the
gas brazing machine.
Warning
If the refrigerant gas leaks
during work, ventilate the
room. (If the refrigerant gas is
exposed to flames, toxic gas
may be generated.)
Compressor
(R11889)
„ Before working, make
sure that the refrigerant
gas is empty in the circuit.
„ Be sure to apply nitrogen
replacement when
heating up the brazed
part.
2 Heat up the brazed part
of the discharge side
and disconnect.
Warning
Since it may happen that the
refrigerant oil in the
compressor catches fire,
prepare wet cloth so as to
extinguish fire immediately.
Caution
From the viewpoint of global
environment protection, do
not discharge the refrigerant
gas in the atmosphere. Make
sure to collect all the
refrigerant gas.
Discharge side
(R12031)
Cautions for restoration
1. Restore the piping by nonoxidation brazing.
2. It is required to prevent the
carbonization of the oil inside
the four way valve and the
deterioration of the gaskets
affected by heat. (Keep
below 120°C.) For the sake
of this, wrap the four way
valve with wet cloth and
provide water so that the
cloth does not dry.
In case of difficulty with gas
brazing machine
1. Disconnect the brazed part
where is easy to disconnect
and restore.
2. Cut pipes on the main unit
with a tube cutter in order to
make it easy to disconnect.
Removal Procedure
161
Outdoor Unit
Procedure
Step
3
SiBE041134
Points
Note:
„ Do not use a metal saw for
cutting pipes by all means
because the sawdust comes
into the circuit.
Heat up the brazed part
of the suction side and
disconnect.
„ When withdrawing the pipes,
be careful not to pinch them
firmly with pliers. The pipes
may get deformed.
Suction side
(R12032)
4
Lift the compressor up
and remove it.
„ Provide a protective sheet or
a steel plate so that the
brazing flame cannot
influence peripheries.
„ Be careful so as not to burn
the compressor terminals,
the name plate, the heat
exchanger fin.
(R7254)
162
Removal Procedure
SiBE041134
Part 8
Trial Operation and
Field Settings
1.
2.
3.
4.
Pump Down Operation........................................................................164
Forced Cooling Operation ...................................................................165
Trial Operation ....................................................................................166
Field Settings ......................................................................................167
4.1
4.2
4.3
4.4
4.5
Model Type Setting ..............................................................................167
When 2 Units are Installed in 1 Room..................................................167
Standby Electricity Saving....................................................................168
Facility Setting Jumper (cooling at low outdoor temperature) ..............168
Jumper Settings ...................................................................................169
5. Application of Silicon Grease to a Power Transistor and
a Diode Bridge ....................................................................................170
Trial Operation and Field Settings
163
Pump Down Operation
SiBE041134
1. Pump Down Operation
Outline
In order to protect the environment, be sure to conduct pump down operation when relocating or
disposing the unit.
Detail
1) Remove the valve caps from the liquid stop valve and the gas stop valve.
2) Carry out forced cooling operation.
3) After 5 to 10 minutes, close the liquid stop valve with a hexagonal wrench.
4) After 2 to 3 minutes, close the gas stop valve and stop the forced cooling operation.
Hexagonal
wrench
Close
Liquid stop valve
Gas stop valve
Service port
Valve cap
(R13628)
Refer to page 165 for forced cooling operation.
164
Trial Operation and Field Settings
SiBE041134
Forced Cooling Operation
2. Forced Cooling Operation
Item
Conditions
Start
Forced Cooling
The forced cooling operation is allowed when both of the following conditions
are met.
1) The outdoor unit is not abnormal and not in the 3-minute standby mode.
2) The outdoor unit is not operating.
The forced cooling operation starts when any of the following conditions is fulfilled.
1) Press the forced cooling operation [ON/OFF] button (SW1) on the indoor
unit for 5 seconds.
2) Press the forced cooling operation [ON/OFF] button (SW1) on the outdoor
unit with standby electricity saving function turned off.
Command
frequency
End
58 Hz
The forced cooling operation ends when any of the following conditions is fulfilled.
1) The operation ends automatically after 15 minutes.
2) Press the forced cooling operation [ON/OFF] button (SW1) on the indoor
unit again.
3) Press the [ON/OFF] button on the remote controller.
4) Press the forced cooling operation [ON/OFF] button (SW1) on the outdoor
unit.
Others
Protection functions have priority over all other functions during forced cooling
operation.
Indoor Unit
[ON/OFF] button (SW1)
Outdoor Unit
1
2
3
Screwdriver
Push here
(R13824)
Trial Operation and Field Settings
165
Trial Operation
SiBE041134
3. Trial Operation
Outline
1. Measure the supply voltage and make sure that it falls within the specified range.
2. Trial operation should be carried out in either cooling or heating operation.
3. Carry out the trial operation in accordance with the operation manual to ensure that all
functions and parts, such as flap movement, are working properly.
„ The air conditioner requires a small amount of power in standby mode. If the system is not to
be used for some time after installation, shut off the circuit breaker to eliminate unnecessary
power consumption.
„ If the circuit breaker trips to shut off the power to the air conditioner, the system backs up the
operation mode. The system then restarts operation with the previous operation mode when
the circuit breaker is restored.
In cooling operation, select the lowest programmable temperature; in heating operation, select
the highest programmable temperature.
„ Trial operation may be disabled in either operation mode depending on the room
temperature.
„ After trial operation is complete, set the temperature to a normal level.
(26°C to 28°C in cooling operation, 20°C to 24°C in heating operation)
„ For protection, the system does not start for 3 minutes after it is turned off.
Detail
ARC466 Series
(1) Press the [On/Off] button to turn on the system.
(2) Press the center of the [Temp] button and the [Mode] button at the same time.
(3) Select T (trial operation) with the [Temp] or button.
(4) Press the [Mode] button to start the trial operation.
(5) Press the [Mode] button and select operation mode.
(6) Trial operation terminates in approx. 30 minutes and switches into normal mode. To quit a
trial operation, press the [On/Off] button.
(3)
(2) (3)
(2) (4) (5)
(1) (6)
(R14593)
166
Trial Operation and Field Settings
SiBE041134
Field Settings
4. Field Settings
4.1
Model Type Setting
ARC466A6
„ This remote controller is common to the heat pump model and cooling only model. Use the
DIP switch on the remote controller to set the heat pump model.
„ Set the DIP switch to H/P as shown in the illustration. (The factory set is the heat pump
side.)
DIP switch
H/P
4.2
C/O
(R12275)
When 2 Units are Installed in 1 Room
When 2 indoor units are installed in 1 room, 1 of the 2 indoor units and the corresponding
wireless remote controller can be set for different addresses.
Both the indoor unit PCB and the wireless remote controller need alteration.
Indoor Unit PCB
„ Cut the address setting jumper JA on the control PCB.
JA
JB
JC
Outline
JA ADDRESS
EXIST
CUT
1
2
(R16497)
Wireless Remote
Controller
(1) Remove the cover and take it off.
(2) Cut the address setting jumper.
Jumper
Address
EXIST
CUT
Trial Operation and Field Settings
1
2
(R14631)
167
Field Settings
4.3
SiBE041134
Standby Electricity Saving
Outline
This function turns OFF the power supply to the outdoor unit and sets the indoor unit into
energy-saving mode, thus reducing the power consumption of the air conditioner.
Detail
The standby electricity saving function is turned OFF before shipping. The following
procedure is required for turning ON the function.
1. Check that the main power supply is turned OFF. Turn OFF if it has not been turned OFF.
2. Remove the stop valve cover.
3. Disconnect the selective connector for standby electricity saving.
4. Turn ON the main power supply.
Selective connector
1
2
1
3
Function OFF
2
3
Function ON
(R13526)
Caution
4.4
Before connecting or disconnecting the selective connector for standby electricity saving, make
sure that the main power supply is turned OFF.
Facility Setting Jumper (cooling at low outdoor
temperature)
Outline
This function is limited only for facilities (the target of air conditioning is equipment (such as
computer)). Never use it in a residence or office (the space where there is a human).
Detail
You can expand the operation range to –15°C by cutting the jumper on the outdoor unit PCB. If
the outdoor temperature falls to –20°C or lower, the operation stops. If the outdoor temperature
rises, the operation starts again.
1
2
3
J5
J4
J3
S40
S70
Cut the jumper J4.
S90
S2
(R12187)
Caution
168
1. If the outdoor unit is installed where the outdoor heat exchanger of the unit is exposed to
direct wind, provide a windbreak wall.
2. Intermittent noises may be produced by the indoor unit due to the outdoor fan turning on and
off when using facility settings.
3. Do not place humidifiers or other items which might raise the humidity in rooms where facility
settings are being used.
A humidifier might cause dew jumping from the indoor unit outlet vent.
4. Cutting the jumper sets the indoor fan tap to the highest position.
Trial Operation and Field Settings
SiBE041134
4.5
Field Settings
Jumper Settings
Jumper
Function
JB
(on indoor unit PCB)
When connected
When cut
(factory setting)
Fan speed setting
Fan speed setting ; Fan speed setting; “0” (The fan
when compressor
Remote controller
stops.)
stops for thermostat setting
OFF. (effective only
in cooling operation)
JC
(on indoor unit PCB)
Power failure
recovery function
J5
Improvement of
(on outdoor unit PCB) defrost
performance
Auto-restart
Standard control
The unit does not resume
operation after recovering from a
power failure. Timer settings are
cleared.
Reinforced control
(ex. The frequency increases,
the duration time of defrost
lengthens.)
For the location of the jumper, refer to page 7, 9.
Trial Operation and Field Settings
169
Application of Silicon Grease to a Power Transistor and a Diode Bridge
SiBE041134
5. Application of Silicon Grease to a Power
Transistor and a Diode Bridge
Applicable
Models
All outdoor units using an inverter type compressor for room air conditioner.
When the printed circuit board (PCB) of an outdoor unit is replaced, it is required that silicon
grease (*1) be precisely applied to the heat radiation part (the contact point to the radiation fin)
of the power transistor and the diode bridge.
*1: Parts number of the silicon grease – 1172698 (Drawing number 3FB03758-1)
Details
The silicon grease is essential for encouraging the heat radiation of the power transistor and the
diode bridge. Applying the grease should be implemented in accordance with the following
instruction.
Note: There is a possibility of failure with smoke emission in case of bad heat radiation.
„ Wipe off the old silicon grease completely off the radiation fin.
„ Apply silicon grease evenly to the whole surface of the radiation fin.
„ Do not leave any foreign object such as solder or paper waste between the power transistor
and the radiation fin, or the diode bridge and the radiation fin.
„ Tighten the screws of the power transistor and the diode bridge, and contact to the radiation
fin without any gap.
<Example>
The shape of the electrical box and PCB vary depending on the model.
Take out a PCB
Power transistor
(TRM, TPM, IGBT, IPM, SPM, etc.)
Diode bridge
(Diode bridge, Rectifier stack, etc.)
Not applied.
OK : Evenly applied
silicon grease.
NG : Not evenly
applied
Paper waste
NG : Foreign object
(R9056)
170
Trial Operation and Field Settings
SiBE041134
Part 9
Appendix
1. Piping Diagrams..................................................................................172
1.1 Indoor Unit............................................................................................172
1.2 Outdoor Unit .........................................................................................172
2. Wiring Diagrams..................................................................................173
2.1 Indoor Unit............................................................................................173
2.2 Outdoor Unit .........................................................................................173
Appendix
171
Piping Diagrams
SiBE041134
1. Piping Diagrams
1.1
Indoor Unit
FTXS20/25K2V1B
INDOOR UNIT
7.0CuT
HEAT EXCHANGER
7.0CuT
4.8CuT
THERMISTOR
ON HEAT EXCH.
7.0CuT
7.0CuT
FIELD PIPING
(6.4CuT)
CROSS FLOW FAN
M
FAN MOTOR
9.5CuT
FIELD PIPING
(9.5CuT)
REFRIGERANT FLOW
COOLING
HEATING
4D058926M
1.2
Outdoor Unit
RXS20/25K2V1B
OUTDOOR UNIT
9.5CuT
7.0CuT
OUTDOOR TEMPERATURE
THERMISTOR
HEAT EXCHANGER
7.0CuT
M
4.8CuT MUFFLER
WITH
FILTER
9.5CuT
PROPELLER FAN
9.5CuT
ELECTRONIC
EXPANSION
VALVE
EV
MUFFLER
WITH
FILTER
φ.4.0×ID. 2.0CuT
HEAT EXCHANGER
THERMISTOR
4.8CuT
6.4CuT 6.4CuT
FOUR WAY
VALVE
ON: HEATING
9.5CuT
7.9CuT
6.4CuT
MUFFLER
WITH
FILTER
LIQUID STOP
VALVE
7.9CuT
MUFFLER
DISCHARGE PIPE
THERMISTOR
9.5CuT
COMPRESSOR
ACCUMULATOR
9.5CuT
MUFFLER MUFFLER
GAS STOP
VALVE
FIELD PIPING
(6.4CuT)
FIELD PIPING
(9.5CuT)
REFRIGERANT FLOW
COOLING
HEATING
3D059586N
172
Appendix
SiBE041134
Wiring Diagrams
2. Wiring Diagrams
2.1
Indoor Unit
FTXS20/25K2V1B
PCB 2
S27
1
BLK
LED1
H1P
BLK
LED2
H2P
BLK
H3P
BLK
LED3
BLK
10
PCB 1
S26
10
BLK
FIELD WIRING.
TRANSMISSION
CIRCUIT
GRN/YLW
FG2
BLK
GRN
FG1 Z1C GRN
H3 N=3
RED
H2
WHT
H1
BLK
BLK
BLK
RECTIFIER
–
+
V1
1
BLK
MR10
S1W
2
3
–
R1T
SIGNAL
RECEIVER
CAUTION
NOTE THAT OPERATION WILL
RESTART AUTOMATICALLY IF
THE MAIN POWER SUPPLY IS
TURNED OFF AND THEN BACK
ON AGAIN.
1
X1M
+
IPM200
1
5
1
9
12
S403
1
6
t°
M1S
1 4
S602
M
M
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
S36
INTELLIGENT EYE
SENSOR
10
INDOOR
BLK
BLK
6
S200
WHT
S6
BLK
BLK
BLK
BLK
WIRELESS
REMOTE
CONTROLLER
2
RED
1
S32
ORG
YLW
BLU
3
BLK
BLK
BLK
BLK
BLK
1
S25
OUTDOOR
1
2
F1U
3.15A
t°
Z2C
N=2
FG1, FG2
F1U
H1~H3
H1P~H3P
M1F
M1S
PCB1~PCB4
R1T, R2T
S6~S602
S1W
Z1C, Z2C
X1M
1
S601
M1F
PCB 3 R2T
NOTE)
S21
1. PCB4 SHOWS THE CASE OF
OPTIONAL CONNECTION.
2.2
3
PCB 4
OPTION
: FRAME GROUND
: FUSE
: HARNESS
: PILOT LAMP
: FAN MOTOR
: SWING MOTOR
: PRINTED CIRCUIT BOARD
: THERMISTOR
: CONNECTOR
: OPERATION SWITCH
: FERRITE CORE
: TERMINAL STRIP
: PROTECTIVE EARTH
3D073474C
Outdoor Unit
RXS20/25K2V1B
FIELD WIRING.
MRM10
S11
E1
PCB1
3
BRN
BRN
outdoor
NOTE
1.REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS.
C5, C6, C119
: CAPACITOR
FU1, FU2, FU3
4
1
IPM1, IPM2
: INTELLIGENT POWER MODULE
L
: LIVE
L1
: COIL
L1R
: REACTOR
M1C
: COMPRESSOR MOTOR
M1F
: FAN MOTOR
MRCW, MR30, MRM10, MRM20 : MAGNETIC RELAY
S100
1 1
2
BLK
BLK
2
: FUSE
V1
S10
DB3
~ +
FU2
3.15A
9
~ _
+
1
S20
M
Y1E
PCB3
PCB1, PCB2, PCB3
3
6
1
S110
SW1
: PRINTED CIRCUIT BOARD
S10, S11, S20, S40, S50
S70, S80, S90, S100, S110
HL3, HN3, X11A, X12A
: CONNECTOR
N
: NEUTRAL
R1T, R2T, R3T
: THERMISTOR
Q1L
: OVERLOAD PROTECTOR
SA1
: SURGE ARRESTER
Appendix
Q1
_
PCB2
S80
S80
3
1
IN CASE OF
COOLING ONLY
TYPE
1
Y1R
1
S90
t˚
6
t˚
W V U
IPM2
MRCW
S50
X12A
: DIODE BRIDGE
BLK
DB1, DB2, DB3
9
MR30_B
WHT
Z2C
N=2
MR30_A
BLK
GRN
GRN
E2
~ _
1
WHT
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
2
S40
1
_
S70
1 4 7 10111213
RED
SA1
1
+
_C119
X11A
RED
FU1
3.15A
+
C6 _
ORG
BLU
MR30
+
C5 _
DB2
~ +
~ _
YLW
GRN/YLW
L
HA2
GRY
BLU
HL2
HA1
HL3
YLW
BLU
V3
N
HN3
HN2
GRY
V2
S
YLW
RED
WHT
BLK
BRN
ORG
BLU
AC2
BLK
RED
+
BLK
BLK
BLK
BLK
BLK
BLK
WHT
3
BLU
N 2
3
IPM1
HR2 DB1
~ +
BRN
BLU
2
WHT
L1R
HR1
L1
RED
BLK
MRM20
N=2
FU3
Z3C AC1 20A
WHT
YLW
ORG
BLU
1
X1M
L 1
WHT
indoor
t˚
R1T R2T R3T
Q1L
(OUTDOOR) (DISCHARGE)
(CONDENSER)
SW1
: FORCED OPERATION SWITCH
V1, V2, V3
: VARISTOR
X1M
: TERMINAL STRIP
Y1E
: ELECTRONIC EXPANSION VALVE COIL
Y1R
: REVERSING SOLENOID VALVE COIL
Z1C, Z2C, Z3C
: FERRITE CORE
: PROTECTIVE EARTH
MS
3~
M1F
Z1C
N=3
W
V
U
MS
3~
M1C
3D065704D
173
Warning
z Daikin products are manufactured for export to numerous countries throughout the world. Prior to
purchase, please confirm with your local authorised importer, distributor and/or retailer whether this
product conforms to the applicable standards, and is suitable for use, in the region where the product
will be used. This statement does not purport to exclude, restrict or modify the application of any local
legislation.
z Ask a qualified installer or contractor to install this product. Do not try to install the product yourself.
Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion.
z Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or
contractor to install those parts and accessories. Use of unauthorised parts and accessories or
improper installation of parts and accessories can result in water or refrigerant leakage, electrical
shock, fire or explosion.
z Read the User's Manual carefully before using this product. The User's Manual provides important
safety instructions and warnings. Be sure to follow these instructions and warnings.
If you have any enquiries, please contact your local importer, distributor and/or retailer.
Cautions on product corrosion
1. Air conditioners should not be installed in areas where corrosive gases, such as acid gas or alkaline gas, are produced.
2. If the outdoor unit is to be installed close to the sea shore, direct exposure to the sea breeze should be avoided. If you need to install
the outdoor unit close to the sea shore, contact your local distributor.
Dealer
Head Office:
Umeda Center Bldg., 2-4-12, Nakazaki-Nishi,
Kita-ku, Osaka, 530-8323 Japan
Tokyo Office:
JR Shinagawa East Bldg., 2-18-1, Konan,
Minato-ku, Tokyo, 108-0075 Japan
http://www.daikin.com/global_ac/
c All rights reserved
zSpecifications, designs and other content appearing in this brochure are current as of February 2012 but subject to change without notice.
SiBE041134
02/2012 AK.B
Download PDF