Friedrich AS - W126BMS0 Service Manual
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Friedrich AS - W126BMS0 Service Manual

Friedrich AS - W126BMS0 Service Manual

Room air conditioner ductless split systems
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Room Air Conditioner

SVC MANUAL(General)
CAUTION
Before Servicing the unit, read the safety
precautions in General SVC manual.
Only for authorized service personnel.
960-914-06

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  • Page 1: Room Air Conditioner

    Room Air Conditioner SVC MANUAL(General) CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel. 960-914-06...

  • Page 2: Table Of Contents

    Air Conditioner Service Manual CONTENTS Part 1 General Information 1. Safety Precautions......................4 2. Nomenclature .......................7 Part 2 Functions & Controls 1. List of Functions & Controls..................9 2. Basic Mode Controls ....................10 3. Special Mode Controls ....................12 4. Utility Functions ......................13 Part 3 Test Run 1.

  • Page 3: Part 1 General Information

    Part 1 General Information 1. Safety Precautions ......................4 2. Nomenclature........................7 - 3 -...

  • Page 4: Safety Precautions

    Part 1 General Information 1. Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. ■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the follow- ing indications.
  • Page 5 Part 1 General Information Do not use a defective or underrated circuit breaker. Use the correctly rated breaker and fuse. Otherwise there is a risk of fire or electric shock. Install the panel and the cover of control box securely. Otherwise there is risk of fire or electric shock due to dust, water etc.
  • Page 6 Part 1 General Information 1.2 Inspections after Repair Check to see if the power cable plug is not dirty or loose. If the plug is dusty or loose it can cause an electrical shock or fire. Do not use a joined power cable or extension cable, or share the same power outlet with other electrical appliances.

  • Page 7: Nomenclature

    Part 1 General Information 2. Nomenclature 2.1 Global Model Name Code Type Code of Model Meaning Production Center, L: Chang-won R22 Refrigerant A: Chang-won R410A U: Tianjin R410A Product Type S: Split Type Air Conditioner Cooling/Heating/Inverter C: Cooling Only H: Heat Pump X: C/O + E/Heater Z: H/P + E/Heater V: AC Inverter C/O...

  • Page 8: Part 2 Functions & Controls

    Part 2 Functions & Controls 1. List of Controls & Functions ..................9 2. Basic Mode Controls......................10 3. Special Mode Controls....................12 4. Utility Functions ......................13 - 8 -...

  • Page 9: List Of Functions & Controls

    Part 2 Functions & Controls 1. List of Functions & Controls Category Function Description Remark Cooling Mode Cooling operation Heating Mode Heating operation Basic mode Healthy Dehumidification Dry operation controls Auto Changeover Cooling mode is automatically changed to heating mode and vice versa Jet Cool Powerful cooling mode...

  • Page 10: Basic Mode Controls

    Part 2 Functions & Controls 2. Basic Mode Controls 2.1 Cooling Mode Thermo ON +0.5C(1F) Setting Temp. -0.5C(-1F) Thermo OFF INV. Comp. High Comp. OFF High Frequency • Operating frequency of compressor depends on the load condition, like the difference between the room temp. and the set temp., frequency restrictions.

  • Page 11: Healthy Dehumidification Operation

    Part 2 Functions & Controls 2.3 Healthy Dehumidification operation • When the dehumidification operation is set by the remote controller, the intake air temperature is detected and the set- ting temp. is automatically set according to the intake air temperature. Intake air Temp.

  • Page 12: Special Mode Controls

    Part 2 Functions & Controls 3. Special Mode Controls 3.1 Jet Cool operation • In the heating mode or Auto Changeover operation, the Jet cool function does not work. When it is input while in other mode of operation (cooling, dehumidification, Air purification, Air circulation), the Jet cool operation takes place.

  • Page 13: Utility Functions

    Part 2 Functions & Controls 4. Utility Functions 4.1 Forced operation • To operate the appliance manually in case when the remote control is lost, the forced operation selection switch is on the main unit of the appliance, and operate the appliance in the standard conditions. •...
  • Page 14 Part 2 Functions & Controls 4.3 Air volume control Step Description • UIndoor fan motor control have 6 steps or 8 steps. Super Low • UAir volume is controlled "SH", "H", "MH", "M", "ML", "L" by the remote controller. • "SL" step is selected in "Sleep Mode" operation. Medium-Low Medium Medium-High...

  • Page 15: Auto Restart

    Part 2 Functions & Controls 4.6.2 Sleep timer operation for heating cycle • While in heating mode, 60 min. after the start of the sleep timer, the setting temperature decreases by 1° C(2° F). After another 60minutes lapse, it decreases again by 1°C(2° F). Setting temp.

  • Page 16: Part 3 Test Run

    Part 3 Test Run 1. Check before Test Run....................17 2. Test Run Flow chart .......................18 3. Test Run Detail........................19 - 16 -...

  • Page 17: Check Before Test Run

    Part 3 Test Run 1. Check before Test Run Check to see whether there is any refrigerant leakage, and check whether the power or transmission cable is connected properly. NOTE: Check that there should be no disconnection when all pins and wires are pulled by hands. Check whether the liquid pipe and gas pipe valves are fully opened.

  • Page 18: Test Run Flow Chart

    Part 3 Test Run 2. Test Run Flow chart START Test operation for indoor unit Operate the unit in cooling mode. Refer to part4, 6 Electric part Does Test operation start? Is cold air discharged for more than 3 minutes ? Refer to part4, 5 Cycle part Is there any temperature difference between intake and...

  • Page 19: Test Run Detail

    Part 3 Test Run 3. Test Run Detail 1. Check that all tubing and wiring have been properly con- NOTE: If the actual pressure is higher than shown, the nected. system is most likely over-charged, and charge should be removed. 2.
  • Page 20 Part 4 Trouble Shooting 1. 2-Way, 3-Way Valve ......................21 2. Pumping Down ......................22 3. Evacuation (All amount of refrigerant leaked) ............23 4. Gas Charging (After Evacuation) .................24 5. Cycle Troubleshooting Guide ..................25 6. Electronic Parts Troubleshooting Guide..............26 7. Self-diagnosis Function....................30 - 20 -...

  • Page 21: Way, 3-Way Valve

    Part 4 Trouble Shooting 1. 2-Way, 3-Way Valve 2-way Valve (Liquid Side) 3-way Valve (Gas Side) Valve cap Hexagonal wrench (4mm) Open position Flare nut Flare nut Closed position Open position Closed position piping piping Service Service connection connection port cap port To outdoor unit To outdoor unit...

  • Page 22: Pumping Down

    Part 4 Trouble Shooting 2. Pumping Down Liquid side Indoor unit Outdoor unit Open 2-Way valve Gas side Closed 3-Way valve CLOSE CLOSE Purge the air • Procedure (6) Operate the air conditioner at the cooling (1) Confirm that both the 2-way and 3-way valves cycle and stop it when the gauge indicates are set to the open position.

  • Page 23: Evacuation (All Amount Of Refrigerant Leaked)

    Part 4 Trouble Shooting 3. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open Vacuum pump Vacuum Gage OPEN OPEN • Procedure (1) Connect the vacuum pump to the center hose (3) Close the valve (Lo side) on the charge set, of charge set center hose turn off the vacuum pump, and confirm that...

  • Page 24: Gas Charging (After Evacuation)

    Part 4 Trouble Shooting 4. Gas Charging (After Evacuation) Liquid side Indoor unit Open Outdoor unit 3-Way valve Gas side Open 3-Way valve Check valve Charging cylinder Vacuum Gage OPEN CLOSE • Procedure This is different from previous procedures. (1) Connect the charge hose to the charging Because you are charging with liquid refrigerant cylinder.

  • Page 25: Cycle Troubleshooting Guide

    Part 4 Trouble Shooting 5. Cycle Troubleshooting Guide Problem Possible causes Corrective action Error Code • There is a burning smell and a strange sound coming from the unit. • Water leaks from the indoor unit even when the humidity level is low. Abnormal operat- •...
  • Page 26 Part 4 Trouble Shooting Problem Possible causes Corrective action Error Code • Air is not circulatingprop- • Make sure that there are no curtains, blinds or fur- erly. niture blocking the front of the air conditioner. • Clean the air filter once every 2 weeks. •...
  • Page 27 Part 4 Trouble Shooting Problem Possible causes Corrective action Error Code • The connection of the indoor and • Conduct the wiring and piping error 05, 09, 53 outdoor units has a problem. check. The air condi- 09, 32, 41, tioner stops •...

  • Page 28: Electric Parts Troubleshooting Guide

    Part 4 Trouble Shooting 6. Electronic Parts Troubleshooting Guide The Product doesn’t operate at all. (9~30kBtu/h Model) Trouble 1 Turn off the main power and wait until LED on outdoor PCB is off. Turn on the main power again. Does "Beeping" sound is made from the indoor unit? Does "Lighting"...
  • Page 29 Part 4 Trouble Shooting Product doesn't operate with the remote controller. Trouble 2 Turn on main power. While the compressor has been stopped, the compressor does not operate owing to the delaying function for 2 minutes after stopped. When the compressor stopped Indoor Fan is driven by a low speed. At this point the wind speed is not controlled by the remote controller.

  • Page 30: Part 4 Trouble Shooting

    Part 4 Trouble Shooting The Compressor/Outdoor Fan don't operate Trouble 3 Turn on the main power. Operate Cooling Mode by setting the desired temperature of the remote controller is less than one of the Indoor temperature by 1°C at least. When in air circulation mode, compressor/outdoor fan is stopped.
  • Page 31 Part 4 Trouble Shooting When indoor Fan does not operate Trouble 4 Turn off main power. Check the connection of CN-FAN. Check the Fan Motor. Check the Fuse(AC250V, T2A). Check the related circuit of indoor Fan Motor. • The pin No. of micom and the part for driving SSR.(Q01M) •...

  • Page 32: Self-Diagnosis Function

    Part 4 Trouble Shooting 7. Self-diagnosis Function ■ Error Indicator • The function is to self-diagnosis airconditioner and express the troubles identically if there is any trouble. • If more than two troubles occur simultaneously, primarily the highest trouble of error code is expressed. •...
  • Page 33 Part 4 Trouble Shooting 3. SF Chassis (1 LED Model) Error code Description Indoor Sensor (Air) open/short Indoor Sensor (Entry Pipe) open/short Float Switch Error Communication Failure (Indoor Unit ↔ Outdoor Unit) Indoor Sensor (Exit Pipe) open/short EEPROM ERROR (Indoor Unit) Indoor Unit Fan Lock (Operation Failure) Indoor Sensor (Middle Pipe) open/short Ex) Error Code 2 : Indoor Sensor(Entry Pipe) open/shot)

  • Page 34: Outdoor Unit Error

    Part 4 Trouble Shooting ■ Outdoor Unit Error 1) 2 LED Type LED1 (Green, 1 Digit) LED2 (Red, 10 Digit) Error Indication Error Indoor Unit Outdoor Unit Description Code LED2 LED1 Green DC Peak (IPM Fault) 2 Times 1 Time 2 Times 1 Time CT 2(Max CT)
  • Page 35 Part 4 Trouble Shooting 2) 1 LED Type Ex) Error Code 21 (DC Peak) Red LED 1sec 2sec 1sec 2sec 1sec 2sec 1sec 2sec Error Indication Error Indoor Unit Outdoor Unit Description Code LED2 LED1 DC Peak (IPM Fault) 2 Times 1 Time 2 Times 1 Time...

  • Page 36: Trouble Shooting Guide (Indoor Unit)

    Part 4 Trouble Shooting ■ Old Model Error Error Indication Error Indoor Description Code Operation Indoor Outdoor Indoor Temperature Sensor Error ● - Suction Sensor open/short Operation - Indoor Pipe Sensor open/short Outdoor Temperature Sensor Error ● ● - Suction Sensor open/short Operation - Outdoor Pipe Sensor open/short Humidity Temperature Sensor Error...
  • Page 37 Part 4 Trouble Shooting ■ Troubleshooting Guide (Indoor Unit) - 37 -...
  • Page 38 Part 4 Trouble Shooting Check Method Measure resistance Check Point Refer to Check Point 1. 10k Ω / at 25℃(77℉)±10% Resistance is adequate? 2. 5k Ω / at 25℃(77℉)±10% 3. 200k Ω / at 25℃(77℉)±10% Sensor OK Replace Sensor ❏ Discharge Pipe Temp Sensor (200 ) Resistance (White) 200~165 @25~30°C ❏...
  • Page 39 Part 4 Trouble Shooting Resistance - Temp. Sensor Table Resistance(KΩ) Temp (℃/℉) Air Sensor s-Pipe Sensor D-Pipe Sensor -30/-22 204.35 102.17 -25/-13 146.97 73.49 -20/-4 107.09 53.55 -15/5 3950 -10/14 58.95 29.48 -5/23 44.47 22.24 0/32 33.9 16.95 585.66 5/41 26.09 13.05 465.17...
  • Page 40 Part 4 Trouble Shooting Inspection Description of Cause of Error Check Point Number Inspection • Float switch open. • The connection of wire (Float switch) CH04 Float switch (Normal : short) • Indoor unit installation. (Inclination) • Water over flow Check Flow Chart Check the level of water (Float moves top...
  • Page 41 Part 4 Trouble Shooting (verify with hands) (verify with hands) - 41 -...
  • Page 42 Part 4 Trouble Shooting • Verify with hands certainly • Connect (pulling by hand to check certainly connection status) • Verify with hands certainly • Repair or replace the (pulling by hand to check connection status) harness. Pin and wire •...

  • Page 43: Trouble Shooting Guide [Outdoor Unit (2 Led Type)]

    Part 4 Trouble Shooting ■ Trouble Shooting Guide [Outdoor Unit (2 LED Type)] 1) CH21: DC Peak Error caution Check that whether the housings and harness would be separated by pulling those with hands directly. • Remedy : replace PCB Assembly. - 43 -...
  • Page 44 Part 4 Trouble Shooting Case of field defect ❏ IPM (Over Current Limit) ❏ Bending/Folding ❏ SVC Valve close - 44 -...
  • Page 45 Part 4 Trouble Shooting 2) CH22: CT2 Error (Input Over-current) caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 45 -...
  • Page 46 Part 4 Trouble Shooting 3) CH23: DC Link Low Voltage Error - 46 -...
  • Page 47 Part 4 Trouble Shooting 4) CH26: DC Comp Location Sensing Error caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 47 -...
  • Page 48 Part 4 Trouble Shooting 5) CH27: PSC Fault Over-current Error caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 48 -...
  • Page 49 Part 4 Trouble Shooting 6) CH29: Compressor phase Over-current Error (only verifiable at Outdoor unit PCB Assembly) caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 49 -...
  • Page 50 Part 4 Trouble Shooting 7) CH32: Inverter Compressor D-Pipe Overheat Error caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 50 -...
  • Page 51 Part 4 Trouble Shooting 8) CH40: CT Sensor Error (Open/Short) Tester Tester - 51 -...
  • Page 52 Part 4 Trouble Shooting 9) CH41/44/45/65: Inv D-Pipe/Outdoor Inlet/Cond. Pipe/Heat sink Sensor Error - 52 -...
  • Page 53 Part 4 Trouble Shooting 10) CH53: Outdoor Unit <-> Indoor Unit Communication Error - 53 -...
  • Page 54 Part 4 Trouble Shooting 11) CH60: Outdoor Unit PCB EEPROM Error • Remedy : reassemble EEPROM / Replace PCB Assembly Check Method - 54 -...
  • Page 55 Part 4 Trouble Shooting 12) CH61: Cond. Pipe Overheat Error (Fan constraint, Heat exchanger contaminated caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 55 -...
  • Page 56 Part 4 Trouble Shooting 13) CH62: Heat Sink Overheat Error - 56 -...
  • Page 57 Part 4 Trouble Shooting 14) CH67: Outdoor BLDC Fan Lock Error Case of field defect ❏ BLDC Fan Motor (short) - 57 -...

  • Page 58: Trouble Shooting Guide [Outdoor Unit(1 Led Type)]

    Part 4 Trouble Shooting ■ Trouble Shooting Guide [Outdoor Unit(1 LED Type)] 1) CH21: DC Peak Error caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 58 -...
  • Page 59 Part 4 Trouble Shooting Resistance between the lines of each 1.5 ~ 2 U - V V - W 1.5 ~ 2 1.5 ~ 2 W - U - 59 -...
  • Page 60 Part 4 Trouble Shooting 2) CH22: CT2 Error (Input Over-current) caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 60 -...
  • Page 61 Part 4 Trouble Shooting 3) CH23: DC Link Low Voltage Error - 61 -...
  • Page 62 Part 4 Trouble Shooting 4) CH26: DC Comp Location Sensing Error caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 62 -...
  • Page 63 Part 4 Trouble Shooting 5) CH29: Compressor phase Over-current Error (only verifiable at Outdoor unit PCB Assembly) caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 63 -...
  • Page 64 Part 4 Trouble Shooting 6) CH32: Inverter Compressor D-Pipe Overheat Error caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 64 -...
  • Page 65 Part 4 Trouble Shooting 7) CH40: CT Sensor Error (Open/Short) Check voltage measurement Is AC input on the input current (Fig.1) current sensing part at the power-on standby normal? state DC 0V ± 0.2V DC voltage measurement Is the Comp at the measurement point in phase Current sensor figure 2 at power-on...
  • Page 66 Part 4 Trouble Shooting 8) CH41/44/45/65: Inv D-Pipe/Outdoor Inlet/Cond. Pipe/Heat sink Sensor Error - 66 -...
  • Page 67 Part 4 Trouble Shooting 9) CH53: Outdoor Unit <-> Indoor Unit Communication Error - 67 -...
  • Page 68 Part 4 Trouble Shooting 10) CH60: Outdoor Unit PCB EEPROM Error - 68 -...
  • Page 69 Part 4 Trouble Shooting 11) CH61: Cond. Pipe Overheat Error Heat exchanger contaminated caution Check that whether the housings and harness would be separated by pulling those with hands directly. - 69 -...
  • Page 70 Part 4 Trouble Shooting 12) CH62: Heat Sink Overheat Error caution Check that whether the housings and harness would be separated by pulling those with hands directly. Are the PCB temperature sensing parts normal? - 70 -...
  • Page 71 Part 4 Trouble Shooting 13) CH67: Outdoor BLDC Fan Lock Error - 71 -...
  • Page 72 P/No : MFL41161608...

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