Daikin FTX50KV1B, FTX25KV1B, FTX71KV1B, RX20K2/5V1B, RX50KV1B Service Manual

...

Service

Manual

[Applicable Models]  Inverter Pair: Heat Pump

Inverter Pair

Wall Mounted Type FTX/ATX-K Series

SiBE041525F

Inverter Pair

Wall Mounted Type

FTX/ATX-K Series

Heat Pump

Indoor Unit

FTX20K(2)V1B FTX50K(M/2)V1B ATX20K(2)V1B FTX25K(2)V1B FTX60K(M/2)V1B ATX25K(2)V1B FTX35K(2)V1B FTX71K(M/2)V1B ATX35K(2)V1B

Outdoor Unit

RX20K2/5V1B RX50K(2)V1B ARX20K2V1B RX25K2/5V1B RX60K(2)V1B ARX25K2V1B RX35K2/5V1B RX71K(2)V1B ARX35K2V1B

SiBE041525F

i Table of Contents

SiBE041525F

Version log

Month / Year Version Revised contents

01 / 2016 SiBE041525E (A)RX20~35K2

02 / 2016 SiBE041525F Include RX71K & FTX71KM

+ standard S21 connection

Table of Contents ii

SiBE041525F

1. Safety Cautions......................................................................................vi

1.1 Warnings and Cautions Regarding Safety of Workers............................vi

1.2 Warnings and Cautions Regarding Safety of Users.............................. viii

2. Icons Used ..............................................................................................x

Part 1 - List of Functions................................................................ 1

1. Functions.................................................................................................2

Part 2 - Specifications.................................................................... 4

1. Specifications ..........................................................................................5

Part 3 - Printed Circuit Board Connector Wiring Diagram............. 6

1. Indoor Unit...............................................................................................7

1.1 20/25/35 Class .........................................................................................7

1.2 50/60/71 Class .........................................................................................9

2. Outdoor Unit..........................................................................................12

2.1 20/25/35 Class .......................................................................................12

2.2 50/60/71 class ........................................................................................13

Part 4 - Functions and Control ..................................................... 14

1. Main Functions......................................................................................15

1.1 Temperature Control ..............................................................................15

1.2 Frequency Principle................................................................................15

1.3 Airflow Direction Control.........................................................................17

1.4 Fan Speed Control for Indoor Unit .........................................................18

1.5 Program Dry Operation ..........................................................................19

1.6 Automatic Operation...............................................................................20

1.7 Thermostat Control.................................................................................21

1.8 NIGHT SET Mode ..................................................................................22

1.9 ECONO Operation .................................................................................22

1.10 Inverter POWERFUL Operation .............................................................23

1.11 Other Functions......................................................................................24

2. Thermistor Functions ............................................................................25

3. Control Specification .............................................................................26

3.1 Mode Hierarchy ......................................................................................26

3.2 Frequency Control..................................................................................27

3.3 Controls at Mode Changing / Start-up....................................................29

3.4 Discharge Pipe Temperature Control.....................................................31

3.5 Input Current Control..............................................................................32

3.6 Freeze-up Protection Control .................................................................33

3.7 Heating Peak-cut Control .......................................................................33

3.8 Outdoor Fan Control...............................................................................34

3.9 Liquid Compression Protection Function................................................34

3.10 Defrost Control .......................................................................................35

3.11 Electronic Expansion Valve Control .......................................................36

3.12 Malfunctions ...........................................................................................39

iii Table of Contents

SiBE041525F

Part 5 - Remote Controller ...........................................................40

1. Remote Controller .................................................................................41

Part 6 - Service Diagnosis ............................................................43

1. General Problem Symptoms and Check Items .....................................44

2. Troubleshooting with LED .....................................................................45

2.1 Indoor Unit..............................................................................................45

2.2 Outdoor Unit ...........................................................................................45

3. Service Diagnosis .................................................................................46

4. Troubleshooting ....................................................................................49

4.1 Error Codes and Descriptions ................................................................49

4.2 Indoor Unit PCB Abnormality .................................................................50

4.3 Freeze-up Protection Control / Heating Peak-cut Control ......................51

4.4 Fan Motor (DC Motor) or Related Abnormality.......................................52

4.5 Thermistor or Related Abnormality (Indoor Unit)....................................54

4.6 Low-voltage Detection or Over-voltage Detection..................................55

4.7 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)......57

4.8 Unspecified Voltage (Between Indoor Unit and Outdoor Unit)...............59

4.9 Outdoor Unit PCB Abnormality...............................................................60

4.10 OL Activation (Compressor Overload) ...................................................61

4.11 Compressor Lock ...................................................................................63

4.12 DC Fan Lock ..........................................................................................64

4.13 Input Overcurrent Detection ...................................................................65

4.14 Four Way Valve Abnormality..................................................................66

4.15 Discharge Pipe Temperature Control.....................................................68

4.16 High Pressure Control in Cooling ...........................................................69

4.17 Compressor System Sensor Abnormality ..............................................70

4.18 Position Sensor Abnormality ..................................................................71

4.19 Thermistor or Related Abnormality (Outdoor Unit).................................73

4.20 Electrical Box Temperature Rise............................................................75

4.21 Radiation Fin Temperature Rise ............................................................76

4.22 Output Overcurrent Detection ................................................................77

5. Check ....................................................................................................79

5.1 Thermistor Resistance Check ................................................................79

5.2 Indoor Fan Motor Connector Output Check ...........................................80

5.3 Power Supply Waveforms Check...........................................................81

5.4 Electronic Expansion Valve Check.........................................................81

5.5 Four Way Valve Performance Check .....................................................82

5.6 Inverter Unit Refrigerant System Check.................................................82

5.7 Inverter Analyzer Check .........................................................................83

5.8 Rotation Pulse Check on the Outdoor Unit PCB....................................85

5.9 Installation Condition Check...................................................................86

5.10 Discharge Pressure Check.....................................................................86

5.11 Outdoor Fan System Check ...................................................................87

5.12 Main Circuit Short Check........................................................................87

5.13 Power Module Check .............................................................................88

Table of Contents iv

SiBE041525F

Part 7 - Trial Operation and Field Settings ..................................90

1. Tips for Servicing ..................................................................................91

1.1 Pump Down Operation ...........................................................................91

1.2 Forced Cooling Operation ......................................................................91

2. Trial Operation ......................................................................................92

3. Field Settings ........................................................................................93

3.1 Temperature Display Switch ..................................................................93

3.2 When 2 Units are installed in 1 Room....................................................93

4. Silicone Grease on Power Transistor / Diode Bridge............................94

Part 8 - Appendix ..........................................................................95

1. Piping Diagrams....................................................................................96

1.1 Indoor Unit..............................................................................................96

1.2 Outdoor Unit ...........................................................................................97

2. Wiring Diagrams....................................................................................99

2.1 Indoor Unit..............................................................................................99

2.2 Outdoor Unit .........................................................................................101

v Table of Contents

SiBE041525F Safety Cautions

1. Safety Cautions

Be sure to read the following safety cautions before conducting repair work. 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.

Caution Items The caution items are classified into Warning and Caution. The Warning items are

especially important since death or serious injury can result 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.

Pictograms This symbol indicates an item for which caution must be exercised.

The pictogram shows the item to which attention must be paid.

This symbol indicates a prohibited action.

The prohibited item or action is shown in the illustration or near the symbol.

This symbol indicates an action that must be taken, or an instruction.

The instruction is shown in the illustration or near the symbol.

1.1 Warnings and Cautions Regarding Safety of Workers

Warning

Do not store equipment in a room with fire sources (e.g., naked flames, gas appliances, electric heaters).

Be sure to disconnect the power cable from the socket before disassembling equipment for repair.

Working on 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 inspect the circuits, do not touch any electrically charged sections of the equipment.

If refrigerant gas is discharged during repair work, do not touch the discharged refrigerant gas.

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 wellventilated 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 refrigerant gas leaks during repair work, ventilate the area.

Refrigerant gas may generate toxic gases when it contacts flames.

Be sure to discharge the capacitor completely before conducting repair work.

The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. A charged capacitor may cause an electrical shock.

Safety Cautions SiBE041525F

Warning

Do not turn the air conditioner on or off by plugging in or unplugging the power cable.

Plugging in or unplugging the power cable to operate the equipment may cause an electrical shock or fire.

Be sure to wear a safety helmet, gloves, and a safety belt when working in a high place (more than 2 m).

Insufficient safety measures may cause a fall.

In case of R-32 / R-410A refrigerant models, be sure to use pipes, flare nuts and tools intended for the exclusive use with the R-32 / R-410A refrigerant.

The use of materials for R-22 refrigerant models may cause a serious accident, such as a damage of refrigerant cycle or equipment failure.

Do not mix air or gas other than the specified refrigerant (R-32 / R-410A / R-22) in the refrigerant system.

If air enters the refrigerant system, an excessively high pressure results, causing equipment damage and injury.

Caution

Do not repair electrical components with wet hands.

Working on the equipment with wet hands may cause an electrical shock.

Do not clean the air conditioner with water.

Washing the unit with water may cause an electrical shock.

Be sure to provide an earth / 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.

vii

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.

SiBE041525F Safety Cautions

Caution

Conduct welding work in a well-ventilated place.

Using a welder in an enclosed room may cause oxygen deficiency.

1.2 Warnings and Cautions Regarding Safety of Users

Warning

Do not store the equipment in a room with fire sources (e.g., naked flames, gas appliances, electric heaters).

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 are scratched or have 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 cables may cause an electrical shock or fire. Placing heavy items on the power cable, or heating or pulling the power cable may damage it.

viii

Safety Cautions SiBE041525F

Warning

Do not mix air or gas other than the specified refrigerant (R-32 / R-410A / R-22) in the refrigerant system.

If air enters the refrigerant 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 the refrigerant, make sure that there is no leak.

If the leaking point cannot be located and the repair work must be stopped, be sure to pump-down, and close the service valve, to prevent refrigerant gas from leaking into the room. Refrigerant gas itself is harmless, but it may generate toxic gases when it contacts flames, such as those from fan type 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 or the installation work is not conducted securely, the equipment may fall and cause injury.

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 is dusty or has a loose connection, it may cause an electrical shock or fire.

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 combustible gas leaks and remains around the unit, it may cause a fire.

Check to see if parts and wires are mounted and connected properly, and if 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.

A corroded installation platform or frame may cause the unit to fall, resulting in injury.

SiBE041525F Icons Used

Caution

Check the earth / grounding, and repair it if the equipment is not properly earthed / grounded.

Improper earth / grounding may cause an electrical shock.

Be sure to measure insulation resistance after the repair, and make sure that the resistance is 1 M 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 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.

2. Icons Used

The following icons are used to attract the attention of the reader to specific information.

Icon Type of

Warning

Caution

Note:

Information

Description

Warning A Warning is used when there is danger of personal injury.

Caution A Caution is used when there is danger that the reader, through

incorrect manipulation, may damage equipment, lose data, get an unexpected result or have to restart (part of) a procedure.

Note A Note provides information that is not indispensable, but may

nevertheless be valuable to the reader, such as tips and tricks.

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.

SiBE041525F

Part 1

List of Functions

1. Functions.................................................................................................2

1 List of Functions

SiBE041525F Functions

1. Functions

Category Functions

FTX20/25/35K(2)V1B

RX20/25/35K2/5V1B

Basic Functions

Compressor Oval scroll compressor — — Air filter (prefilter) 

Comfortable Airflow

Comfort Control

Operation Automatic operation 

Lifestyle Convenience

Inverter (with inverter power control) Health &

–10

Operation limit for cooling (°CDB)

Operation limit for heating (°CWB)

PAM control 

Standby electricity saving 

Swing compressor  Wipe-clean flat panel 

Rotary compressor — — Washable grille — —

Reluctance DC motor  MOLD PROOF operation — —

Power-airflow flap  — Good-sleep cooling operation — —

Power-airflow dual flaps —  Timer WEEKLY TIMER operation — —

Power-airflow diffuser — — 24-hour ON/OFF TIMER — —

Wide-angle louvers  Count up-down ON/OFF timer 

Auto-swing (up and down)  NIGHT SET mode 

Auto-swing (right and left) — — Worry Free

3-D airflow — — Self-diagnosis (R/C, LED) 

COMFORT AIRFLOW operation  Wiring error check function — —

Auto fan speed 

Indoor unit quiet operation 

NIGHT QUIET mode (automatic) — — H/P, C/O compatible indoor unit — —

OUTDOOR UNIT QUIET operation (manual)

2-area INTELLIGENT EYE operation — — Chargeless 10 m 10 m

INTELLIGENT EYE operation — — Either side drain (right or left) 

Quick warming function (preheating control)

Hot-start function 

Automatic defrosting Remote

Program dry operation 

Fan only 

New POWERFUL operation (non-inverter)

Inverter POWERFUL operation Remote

Priority-room setting — — Wired (option) 

COOL/HEAT mode lock — —

HOME LEAVE operation — —

ECONO operation 

Indoor unit ON/OFF button 

Signal receiving sign 

R/C with back light — —

Temperature display — —

–10

~ 46

–15

~ 18

——

 Power selection — —

——

Category Functions

FTX50/60/71K(M/2)V1B

RX50/60/71K(2)V1B

Cleanliness

(Reliability & Durability)

Flexibility Multi-split / split type compatible

Control

Controller

Air-purifying filter — —

Photocatalytic deodorizing filter — —

Air-purifying filter with photocatalytic deodorizing function

Titanium apatite photocatalytic air-purifying filter

Auto-restart (after power failure) 

Anti-corrosion treatment of outdoor heat exchanger

indoor unit

Flexible power supply correspondence

°C/°F changeover R/C temperature display (factory setting: °C)

5-room centralized controller (option) 

Remote control adaptor (normal open pulse contact) (option)

Remote control adaptor (normal open contact) (option)

DIII-NET compatible (adaptor) (option)

Wireless 

FTX20/25/35K(2)V1B

RX20/25/35K2/5V1B

FTX50/60/71K(M/2)V1B

RX50/60/71K(2)V1B

——



——



Note:  : Available

— : Not available

List of Functions 2

Functions SiBE041525F

Category Functions

Basic Functions

Compressor Oval scroll compressor — Air filter (prefilter) 

Comfortable Airflow

Comfort Control

Operation

Lifestyle Convenience

Inverter (with inverter power control)  Health &

Operation limit for cooling (°CDB)

Operation limit for heating (°CWB)

PAM control 

Standby electricity saving 

Swing compressor  Wipe-clean flat panel 

Rotary compressor — Washable grille —

Reluctance DC motor  MOLD PROOF operation —

Power-airflow flap  Good-sleep cooling operation —

Power-airflow dual flaps — Timer WEEKLY TIMER operation —

Power-airflow diffuser — 24-hour ON/OFF TIMER —

Wide-angle louvers  Count up-down ON/OFF timer 

Auto-swing (up and down)  NIGHT SET mode 

Auto-swing (right and left) — Worry Free

3-D airflow — Self-diagnosis (R/C, LED) 

COMFORT AIRFLOW operation  Wiring error check function —

Auto fan speed 

Indoor unit quiet operation  Flexibility Multi-split / split type compatible indoor unit 

NIGHT QUIET mode (automatic) — H/P, C/O compatible indoor unit —

OUTDOOR UNIT QUIET operation (manual) — Flexible power supply correspondence —

2-area INTELLIGENT EYE operation — Chargeless 10 m

INTELLIGENT EYE operation — Either side drain (right or left) 

Quick warming function (preheating control)  Power selection —

Hot-start function 

Automatic defrosting  Remote

Automatic operation 

Program dry operation 

Fan only  DIII-NET compatible (adaptor) (option) 

New POWERFUL operation (non-inverter)

Inverter POWERFUL operation  Wired (option) 

Priority-room setting —

COOL/HEAT mode lock —

HOME LEAVE operation —

ECONO operation 

Indoor unit ON/OFF button 

Signal receiving sign 

R/C with back light —

Temperature display —

–10

~ 46

–15

~ 18

Category Functions

ATX20/25/35K(2)V1B

ARX20/25/35K2V1B

Air-purifying filter —

Photocatalytic deodorizing filter —

Air-purifying filter with photocatalytic deodorizing function

Titanium apatite photocatalytic air-purifying filter

Auto-restart (after power failure) 

Anti-corrosion treatment of outdoor heat exchanger

°C/°F changeover R/C temperature display (factory setting: °C)

5-room centralized controller (option) 

Remote control adaptor (normal open pulse contact) (option)

Remote control adaptor (normal open contact) (option)

Wireless 

—

Cleanliness

(Reliability & Durability)

Control

Remote Controller

Note:  : Available

— : Not available

ATX20/25/35K(2)V1B

ARX20/25/35K2V1B

—



3 List of Functions

SiBE041525F

Part 2

Specifications

1. Specifications ..........................................................................................5

Specifications 4

Specifications SiBE041525F

1. Specifications

See corresponding databook

5 Specifications

SiBE041525F

Connector Wiring Diagram

Part 3

Printed Circuit Board

1. Indoor Unit...............................................................................................7

1.1 20/25/35 Class .........................................................................................7

1.2 50/60/71 Class .........................................................................................9

2. Outdoor Unit..........................................................................................12

2.1 20/25/35 Class .......................................................................................12

2.2 50/60/71 class ........................................................................................13

Printed Circuit Board Connector Wiring Diagram 6

Indoor Unit SiBE041525F

S32

S26

H3 H2 H1

S200

2P341918-9

FU1

1. Indoor Unit

1.1 20/25/35 Class

Control PCB (PCB1)

1) S6 Connector for swing motor (horizontal blade)

2) S26 Connector for display PCB

3) S32 Connector for indoor heat exchanger thermistor

4) S200 Connector for DC fan motor

5) H1, H2, H3, FG Connector for terminal board

6) FU1 Fuse (3.15 A, 250 V)

7) V2 Varistor

7 Printed Circuit Board Connector Wiring Diagram

SiBE041525F Indoor Unit

S27

SW1

(Solder side)

LED2 LED1

RTH1

3P185701-4

 LED3 is not mounted.

S602

S21

To connector S403 of control PCB (PCB1)

S601

To optional wired remote controller BRC073 and BRP069

Display PCB (PCB2)

1) S27 Connector for control PCB

2) SW1 (S1W) Forced cooling operation ON/OFF button * Refer to page 91 for details.

3) LED1 (H1P) LED for operation (green)

4) LED2 (H2P) LED for timer (yellow)

5) RTH1 (R1T) Room temperature thermistor

Note: The symbols in the parenthesis are the names on the appropriate wiring diagram.

Remote Control PCB (BR069)

Printed Circuit Board Connector Wiring Diagram 8

Indoor Unit SiBE041525F

S26

S900

3P380931-1

S32

S200

1.2 50/60/71 Class

Control PCB (PCB2)

1) S6 Connector for swing motor (horizontal blade)

2) S26 Connector for display PCB

3) S32 Connector for indoor heat exchanger thermistor

4) S200 Connector for DC fan motor

5) S900 Connector for filter PCB

9 Printed Circuit Board Connector Wiring Diagram

SiBE041525F Indoor Unit

3P380932-1

S800

V2 HE S100

FU1

S27

SW1

(Solder side)

LED2 LED1

RTH1

3P185701-4

 LED3 is not mounted.

Filter PCB (PCB1)

1) S100 Connector for terminal board

2) S800 Connector for control PCB

3) FG, HE Connector for ground

4) FU1 Fuse (3.15 A, 250 V)

5) V2 Varistor

Display PCB (PCB3)

1) S27 Connector for control PCB

2) SW1 (S1W) Forced cooling operation ON/OFF button

* Refer to page 91 for details.

3) LED1 (H1P) LED for operation (green)

4) LED2 (H2P) LED for timer (yellow)

5) RTH1 (R1T) Room temperature thermistor

Note: The symbols in the parenthesis are the names on the appropriate wiring diagram.

Printed Circuit Board Connector Wiring Diagram 10

Indoor Unit SiBE041525F

Remote Control PCB (BR069)

To optional wired remote controller BRC073 and BRP069

S21

S602

To connector S403 of control PCB (PCB1)

S601

11 Printed Circuit Board Connector Wiring Diagram

SiBE041525F Outdoor Unit

E1, E2

FU3

V150

FU1

FU2

HR1

HR2

S20

LED A

S90

S30 S40

HL1, HN1, S

S80 S71

2P383853-1

2. Outdoor Unit

2.1 20/25/35 Class

Main PCB (PCB1)

1) S20 Connector for electronic expansion valve coil

2) S30 Connector for compressor motor

3) S40 Connector for overload protector

4) S71 Connector for DC fan motor

5) S80 Connector for four way valve coil

6) S90 Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe)

E1, E2 Terminal for earth wire

8) HL1, HN1, S Connector for terminal board

9) HR1, HR2 Connector for reactor

10)FU1, FU2 Fuse (3.15 A, 250 V)

11)FU3 Fuse (20 A, 250 V)

12)LED A LED for service monitor (green)

13)V2, V3, V150 Varistor

Printed Circuit Board Connector Wiring Diagram 12

Outdoor Unit SiBE041525F

U, V, W

FU3

FU1

FU2

S20S80 S40 S90

S70

2P382390-12

E1, E2

HL1, HN1, S

LED A

2.2 50/60/71 class

Main PCB

1) S20 Connector for electronic expansion valve coil

2) S40 Connector for overload protector

3) S70 Connector for DC fan motor

4) S80 Connector for four way valve coil (heat pump model only)

5) S90 Connector for thermistors

(outdoor temperature, outdoor heat exchanger, discharge pipe)

6) HL1, HN1, S Connector for terminal board

7) E1, E2 Terminal for ground

8) U, V, W Connector for compressor

9) FU1, FU2 Fuse (3.15 A, 250 V)

10)FU3 Fuse (30 A, 250 V)

11)LED A LED for service monitor (green)

12)V1, V2, V3 Varistor

13 Printed Circuit Board Connector Wiring Diagram

SiBE041525F

Part 4

Functions and Control