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repairing.

The products 2P and higher are mainly developed for two generations.

The 1

generation (VP1) applies NEC 180° sine wave plan and indoor control.

The 2

generation (VP2) applies TI DSP 180° sine wave plan and outdoor control. (Exclusive of

2P unit).

There are derivative models, e.g. full DC inverter unit, inverter floor-standing unit and LC plan.
See Appendix 1 for details.

2. Wiring of Inverter AC Unit

3. Current Flow

Power

supply

Liv
e

eutral

ound

Live

Neutral

Communicati
on wire

Ground

Main
control
board

Indoor

unit

Outdoor

power
source

Live

Neutral

Outdoor

Unit

PFC board

IPM board

Compressor

Transformer

Display circuit

board

Motor

protector

Fan Motor

Room temperature

sensor

Coil temperature

sensor

Main control

board

Relay

Guide louver

motor

Y/G

Indoor unit

Y/G

Heat exchanger

Y/G

4-way Valve

Electric

Heater

Solenoid

valve

Optional

Y/G

Outdoor unit

Fan

motor

Note: There is no LOW FAN for single-speed motor P9-2

Outdoor po

wer sou

rce

boar

Reactor

Compressor

Re Wh BL

Module board

Compressor top protection switch
(Optional)

Exhaust temperature sensor

Outdoor temperature sensor

Outdoor coil temperature sensor

Port: P9 pair port for dual-speed motor

Содержание WD Series

Страница 1: ...hooting and Repair Guideline for WD Indoor YN Outdoor Units Series DC Inverter Air Conditioner WYD GF16 S1 1714 SERVICE MANUAL DC INVERTER SPLIT WALL MOUNTED DUCTLESS HEAT PUMPS WYD GLFI SERIES 16 SEER VERSIONS ...

Страница 2: ... 14 7 Display EA 16 8 Display EU 17 9 Display E9 Firstly display P0 or P9 then change to E9 18 10 Display E0 E5 20 11 Display EE 22 12 Display P0 23 13 Display P1 24 14 Display P2 24 15 Display P4 25 16 Display P5 25 17 Display P6 26 18 Display P7 27 19 Display P8 27 20 Display P9 28 2 Other faults 29 1 The indoor unit works normally but the outdoor unit does not work 29 2 The outdoor unit is stop...

Страница 3: ...5P has been developed for four generations The 1st generation V1 applies 120 square wave control plan and the all PFC plan is used for power treatment The 2nd generation V2 remains to apply 120 square wave control plan but the partial PFC plan is used for power treatment This product is never put into batch production The 3rd generation V3 applies 180 sine wave plan and partial PFC plan This model...

Страница 4: ...r unit Outdoor power source Live Neutral Outdoor Unit PFC board IPM board Compressor Transformer Display circuit board Motor protector Fan Motor Room temperature sensor Coil temperature sensor Main control board Relay Guide louver motor Y G Br Or BL BL BR Indoor unit Y G Heat exchanger Wh BL Br Y G Or BL Y G 4 way Valve BL Electric Heater Solenoid valve Optional Y G Outdoor unit Fan motor Or BL Re...

Страница 5: ...r drive IPM fault output PFC control DC power Outdoor PFC board AC rectifier Power factor adjustment Protection current sampling Outdoor control IPM module ST72141 Communication with power source board PFC control IPM drive Current sampling and processing Voltage sampling and signal processing Detection of compressor feedback signal PS21865 Compressor inverter drive IPM fault signal output Signal ...

Страница 6: ... EA EEPROM fault RUN 12 8 sec EE Temperature switch fault on top of the compressor RUN 13 8 sec EP Voltage sensor fault RUN 14 8 sec EU Intake temperature sensor RUN 15 8 sec EH Protection Code Protection Type Function Indicator flash Digital LED display Overvoltage undervoltage protection RUN Blink TIMER 1 blink 8 sec P1 Overcurrent protection RUN Blink TIMER 2 blink 8 sec P2 Exhaust overtemperat...

Страница 7: ...on 7 Communication fault with indoor unit 24 Model configuration wrong 8 Compressor overheat fault compressor top switch 25 Indoor sensor fault 9 Short circuit open circuit fault of outdoor temperature sensor 26 Indoor coil sensor fault 10 Short circuit open circuit fault of outdoor heat exchanger temperature sensor 27 Indoor EEPROM fault 11 Short circuit open circuit fault of exhaust temperature ...

Страница 8: ...ction 11 AC overcurrent protection 12 Exhaust Temperature Protection 13 Compressor top temperature protection 14 Exhaust Overtemperature Protection 15 Voltage protection 16 Exhaust underpressure protection 17 Exhaust Overpressure Protection 18 Indoor antifreeze protection 19 Indoor overheat protection 20 Indoor outdoor communication fault 21 Outdoor EEPROM fault 22 Outdoor ambient overtemperature ...

Страница 9: ...sure the resistance on the two ends of indoor temperature sensor 25 5KΩ For other resistance please refer to the Temperature Resistance Sheet Appendix 1 Replace the temperature sensor if the resistance is incurred to drift open or short circuiting Photo 2 3 If the above testing is normal Replace the indoor control board Position and marking of temperature sensors CN6 RT IPT on indoor control board...

Страница 10: ...e fan does not run readjust the fan position until it can run smoothly 2 If the motor insert CN3 CN4 on indoor main PCB is in good contact with the slot Insert again if loose Red line part 3 Startup capacitance value Capacitance incorrect Replace with a new capacitor Yellow line part 4 The above inspections are normal Replace the indoor main PCB ...

Страница 11: ...o ends of outdoor temperature sensor Resistance of CN1 terminal sensor 25 5KΩ For other resistance please refer to the Temperature Resistance Sheet Resistance of CN2 terminal sensor 25 20KΩ For other resistance please refer to the Exhaust Temperature Sensor Resistance Sheet Replace the temperature sensor if the resistance is incurred to drift open or short circuiting Photo 4 3 If the above testing...

Страница 12: ...ystem is in shortage of refrigerant Test with pressure gauge check the leakage point and recharge the refrigerant Photo 6 3 Check the evaporator coil temperature sensor 25 5KΩ For other resistance please refer to the Temperature Resistance Sheet Replace the temperature sensor if the resistance is incurred to drift open or short circuiting Photo 7 1 The flow might be uneven for indoor system Short ...

Страница 13: ...12 ...

Страница 14: ...normally Replace the intelligent power module If the fault remains unsolved replace the power source board again Red line part The indicator on intelligent power module blinks normal bright for 1 second and dark for 1 second but the indicator on power source board does not work normally Replace the power source board If the fault remains unsolved replace the intelligent power module again Orange l...

Страница 15: ...Check the system pressure The pressure is low Add refrigerant to ensure the system pressure is normal Photo 12 2 Compressor temperature The temperature is very high accompanied with bad smell Check the outdoor ventilation and if there is any obstruction that affects the normal radiating of the air conditioner Install to the position as required in the Instruction Manual and ensure the air inlet an...

Страница 16: ...15 1 1 5P CN3 jumper The jumper may be used as alternative if there is no compressor top switch The correct sequence of U V and W wiring shall be red white and blue ...

Страница 17: ...e Find the leakage point and recharge the refrigerant If higher than 0 4V replace the intelligent power module Photo 13 2 V1 inverter unit Test the voltage of 5 pin to 2 pin on power factor correction If not higher than 0 4V replace power factor correction 3 V2 V3 V4 V5 VP1 VP2 inverter unit Replace the outdoor power source board ...

Страница 18: ...on again please replace the outdoor power source board 1 V1 inverter unit Communication wires between outdoor power source board and intelligent power module CN5 If the fault remains unsolved after replacement of outdoor power source board please replace the intelligent power module 2 V2 V3 V4 V5 VP1 VP2 Inverter Unit Replace the outdoor power source board Check CN5 insert ...

Страница 19: ...d ensure the air inlet and outlet of the outdoor unit is smooth 1 Re energize and check the protection code on display Firstly display P0 P0 appears when the air conditioner is working The above inspections are normal but the fault remains unsolved Replace the intelligent power module If this code is displayed when the compressor is started for several seconds or even not started check the compres...

Страница 20: ...The wires on U V and W ends are respectively colored red white and blue Apply the silicone evenly If the screw is not fixed tightly to position it is easy to cause poor radiation and damage to the elements ...

Страница 21: ...e the indoor main PCB If the fault remains unsolved replace the outdoor power source board 1 The indicator is dark Check PFC board Test the pins of rectifier bridge fast recovery diode FRD and IGBT elements for any breakdown short circuiting or damage If damaged it is needed to replace PFC board Photo 17 red 2 If no damage test the DC voltage between DC and DC If the voltage is approx 300V Replace...

Страница 22: ...21 Check power factor correction Test the pins of rectifier bridge fast recovery diode FRD and IGBT elements for any breakdown short circuiting or damage Test the DC voltage between DC and DC ...

Страница 23: ...improper Fix again Photo 19 1 Shut down the power supply and re energize If the fault remains it is needed to check if the outdoor EEPROM installation is loose or improper Fix again Photo 20 2 If the installation is good Replace the indoor main PCB firstly 3 If the fault remains unsolved after replacement of the indoor control board Outdoor power source board EEPROM installation is improper EEPROM...

Страница 24: ...t if the pressure is low Discharge some refrigerant if the pressure is too high Check the outdoor ventilation and if there is any obstruction that affects the normal radiating of the air conditioner Install to the position as required in the Instruction Manual and ensure the air inlet and outlet of the outdoor unit is smooth Re energize and check the protection code on display Firstly display P0 P...

Страница 25: ...his range Photo 24 3 If the voltage is normal Replace the outdoor power source board 14 Display P2 Symptom Display P2 Cause Overcurrent protection S N Inspections How to Solve Remarks 1 Check if the outdoor fan motor is stopped due to overheat protection or damaged and if the fan capacitor is damaged Replace the damaged capacitor and the damaged outdoor fan motor 2 power source board or intelligen...

Страница 26: ...aged Replace the outdoor power source boar 16 Display P5 Symptom Display P5 Cause Subcooling protection under cooling mode S N Inspections How to Solve Remarks 1 Check if the air inlet and outlet of indoor unit is blocked by any obstructions Install to the position as required in the Instruction Manual and ensure the air inlet and outlet of the outdoor unit is smooth 2 Check the system for shortag...

Страница 27: ...Instruction Manual and ensure the air inlet and outlet of the outdoor unit is smooth 2 Check the system for shortage of refrigerant Add refrigerant 3 Check if the outdoor evaporator coil temperature sensor is drifted short circuited or open circuited 25 5KΩ For other resistance please refer to the Temperature Resistance Sheet Replace the outdoor coil temperature sensor Photo 26 4 Control board dam...

Страница 28: ... IPT Photo 27 4 Control board damaged Replace the indoor control board 19 Display P8 Symptom Display P8 Cause Outdoor overtemperature undertemperature protection S N Inspections How to Solve Remarks 1 The compressor cannot run under cooling mode when the outdoor temperature is lower than 1 or run under heating mode when the outdoor temperature is higher than 33 whilst the compressor alarms P8 prot...

Страница 29: ... is normal during run Replace the intelligent power module Be sure to apply silicone when replacing the intelligent power module Photo 30 P9 appears after the air conditioner is started and has run for a period of time If the cooling heating are abnormal check the compressor wiring for correctness Insert again if loose 1 Re energize and check the protection code on display Firstly display P9 When ...

Страница 30: ...rant c Check if the resistance of each temperature sensor is drifted See appendix for the temperature sensor parameters If yes replace the temperature sensor d Check if the JP3 jumper of indoor control board is soldered If not solder the jumper Then restart the unit and check what protection code will be displayed Treat according to the fault code e Check if the indoor outdoor and circuit board wi...

Страница 31: ...le the ground wire might be wrongly connected as the neutral wire b Check if the indoor outdoor circuit and the wiring terminal are correctly connected and if there is short circuiting c Check if the outdoor circuit board wiring terminal and power connection wires are damaged and if there is short circuiting to the metal parts d Check if the rectifier bridge of outdoor controller See appendix for ...

Страница 32: ...31 Appendix 1 1 Indoor main PCB Jumper for Function Selection No power relay with duplicate insert as replacement Jumper for Function Selection Electric heater control relay ...

Страница 33: ...32 Indoor board for BL floor standing inverter unit display board power drive board 2 Outdoor power source board V5 ...

Страница 34: ...33 3 Power factor correction 4 Intelligent power module ...

Страница 35: ...34 ...

Страница 36: ...35 ...

Страница 37: ...entify DC input P6 1 DC DC input P7 1 DC DC output P6 2 DC DC output P7 2 DC 4 way valve output P8 VAL K4 Outdoor fan HI output P9 1 H K2 Outdoor fan LOW output P9 2 L K3 Outdoor fan capacitor P9 3 C Compressor output phase U P10 1 U Compressor output phase V P10 2 V Compressor output phase W P10 3 W Module DC input P6B DC Intelligent power module Module DC input P7B DC Intelligent power module PF...

Страница 38: ... flat and even Use plastic scraper to apply the grease Firstly place a tiny quantity of thermal grease at the center of the place where the grease is to be coated Then use the plastic scraper to apply the grease at the center slightly and evenly onto the entire surface to be treated In consideration of the deviation in the levelness of radiating fin the thickness of thermal grease must be 0 1mm fo...

Страница 39: ...ction 1 Insulation paper must be attached between power diode IGBT rectifier and radiating fins The screw locking torque is 7 0 5kgf cm Do not loosen the insulation paper after attaching it fully flat onto the radiator To retighten after loosening it is needed to eliminate the aluminum scraps on the radiator before retightening 2 It is also needed apply the thermal grease evenly when replacing and...

Страница 40: ... to 0 position and then slowly return to If not the electrolytic capacitor is damaged 4 Make sure to have some understanding to the circuit before carrying out repair Most fundamentally the operator must know the composition of the circuits position of each part and the possible function 5 It is an extremely unscientific repair method for starting the measurement immediately after getting the circ...

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