SERVICE MANUAL
Contents
1. Replace the IPM board if it is separate with main PCB 45 9 2 7 Inverter compressor drive error diagnosis and solution P4 Check if the wiring between main PCB and compressor connected by error and if the wires and connectors are broken No Y Check if the IPM installed correctly Yes Y IPM continuity check Check if the IPM terminal resistance values are uniform Yes Correct the connection or Yes replace the wires and connectors Correct the installation y tighten the screws and apply silicon grease No No ventilation is good Yes y Check if the compressor resistance values are uniform Yes Y Replace the outdoor main PCB if the main PCB and IPM are separate Check if the outdoor fan runs properly or the outdoor unit No gt 46 v Replace the IPM board or replace the main PCB if the IPM board and main PCB are integrated together Refer to the solution of fan speed has been out of control malfunction Find out the cause and have it solved Replace the compressor Main parts check 1 Temperature sensor checking Disconnect the temperature sensor from PCB measure the resistance value with a tester Tester Temperature Sensors Room temp T1 sensor Indoor coil temp T2 sensor2. 1 1 1 1 COMPRESSOR i 1 1 MWCOHCS36S MRCOHC36AS 5 WAY TERMINAL BLUE CN22 T 5 YELLOW 19 BLACK Y G Y G CN5 111 441411 2 MAIN BOARD NC TO INDOOR UNIT PONER SUPPLY a wayi 7 RA o value E 7 IS used in the cooing WHITE Pe OPTIONAL 8 Heating unit only HEATILCNS HEATER _ OPTIONAL A E ET HEATILCN10 BLACK HEATER WHITE liis HEAT2 CN31 HEATER CT1 cua EE CN33 BLACK NERONE BLACK DETECTOR 11 2 CNS 5 CAPACITOR FAN CAPACITOR CAP1 R2503 HEAT EXCHANGER TEMP SENSOR AMBIENT SENSOR 202038190274 OUTDOOR conpressor H Hs Lew 18 5 I HIGH PRESSURE SWITCH DISCHARGE TEMP SENSOR NZ NZ NZ NZ E P 5 WAY TERMINAL COMPRESSOR BLACK Y G TEE BLACK WHITE CN14 RED YELLOW p amp CN18 CN23 BLUE BLACK YELLOW zh es U W 2 CN19C mice S R CN33 ON 25 cns a 2 W a L MAIN BOARD ow Oc ps 5 Y G BLU 4 WAY POSSESSES RED PTIONAL P1 HEAT L CN31 uis CURRENT DETECTOR 4 3 we CN33 BLACK N 1 1 5 OUTDOOR RECT IF ILERI FAN CAPACITOR
3. and keeps lower than 4U for more than minutes the machine will defrost no matter if T2 drops for more than 50 or not Condition of ending defrosting If one of following items is satisfied defrosting will finish and the machine will turn to normal heating mode T3 rises to be higher than 150 rises to be higher than 80 and remains for 80 seconds The machine has run for 10 minutes in defrosting 32 The defrosting action XX 60 Compressor 4 way valve Outdoor fan Indoor fan on off on off on off on off Frequency F2 FrequencyF8 Indoor fan breeze 10s 10s no longer than 10m 1306 33 8 4 3 5 High evaporator coil temp T2 protection 1 12 53 1 compressor running frequency decreases to the lower level and runs for 20s When the frequency decreases to F2 and the T2 exceeds 530 for minutes the compressor will stop 2 If T2 48 or T2 stays in 4811 5301 for 6 minutes the frequency will not be limited by T2 3 If T2 gt 60_1 the compressor will stop and restart when 2 lt 48 8 4 4 Drying mode 8 4 4 1 Indoor fan speed is fixed at breeze and can t be changed The louver angle is the same as cooling mode 8 4 4 2 Compressor running rules
4. Lies AZ F3 2 0 1 5 E 1 0 0 5 Fi 0 0 8 4 4 3 Over low room temperature protection In drying mode if room temperature is lower than 100 the compressor will stop and not resume until room temperature exceeds 1211 8 4 4 4 Evaporator anti freezing protection condenser high temperature protection and outdoor unit frequency limit are active and the same as that in cooling mode 8 4 4 5 The outdoor fan operates the same as in cooling mode 34 8 4 5 Auto mode This mode be chosen with remote controller and the setting temperature be changed between 17 300 In auto mode the machine will choose cooling or fan only mode according to AT 1 5 Indoor fan will run at auto fan of the relevant mode The louver operates same as in relevant mode If the setting temperature is modified the machine will choose running function again 8 4 6 Forced operation function 8 4 6 1 Forced cooling and auto function can carry out with a touch button In these two modes the machine can be changed by remote controller to any other mode at any moment 8 4 6 2 When the machine is off pressing the touch button will carry the machine to forced auto mode after this if pressing the button once again within 5 seconds the machine will turn into forced cooling mode In forced auto forced cooling or any other operation
5. AIR CONDITIONERS SERVICE MANUAL SPLIT WALL MOUNTED TYPE CERTIFIED www ahridirectory org QM SY ISO 14001 REGISTERED FIRM REGISTERED FIRM MODELS MWCOHC30S MRCOHC30AS MWCOHC36S MRCOHC36AS CONTENTS 1 Precaulioli oui nee 1 11 Safety 1 tee 1 2 eig Hn 6 Se DIMENSION D ILLE e 7 Sel WAG OOK EC A E 7 4 ae IEP E 8 4 Refrigerant Cycle 9 ecc 10 ONT 10 2 QUIGO OW TET 11 o Installatlorr defalls Soci uie CE cupo it Tope sup eis E eU DLL eue EP LC 12 6 1 Wrench torque sheet for installation sls 12 62 Mis 4S9 ERR E 12 6 3 Pipe lerigth and the elevation Mic eto de anc dita Pot 13 6 4 Installation for the O EET 14 6 5 Adding the refrigerant after running the system for many years 17 6 6 Re
6. B Donotinsert hands or other object through air inlet or outlet while the product is operated There are sharp and moving parts that could cause personal injury B 4 Do not drink the water drained from the product 4 It is not sanitary could cause serious health issues B Use a firm stool or ladder when cleaning or maintaining the product Be careful and avoid personal injury B Replace the all batteries in the remote control with new ones of the same type Do not mix old and mew batteries or different types of batteries There is risk of fire or explosion B or disassemble the batteries Do not dispose of batteries in a fire They may burn of explode B Ifthe liquid from the batteries gets onto your skin or clothes wash it well with clean water Do not use the remote of the batteries have leaked The chemical in batteries could cause burns or other health hazards The designs and information in this book are subject to change without notice for product improvement 2 Function Filter killer of formaldehyde lonizer O Silver Ico Filter O Vitamin C Filter O 3M HAM Filter O Bio Filter O Golden Fin O Self Clean O Follow me O 8 degree heating O Heat compensation O Self diag function Hydrophilic
7. CAP1 11 6 Installation details 6 1 Wrench torque sheet for installation Outside diameter Additional tightening mm 06 35 09 52 2500 2600 1500 1600 0155 4500 4700 6500 6700 4 3 8 5 8 4 019 3 6 2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet Rated current of appliance Nominal cross sectional area mm gt 6 and 10 gt 10 and 316 The cable size and the current of the fuse or switch are determined by the maximum current indicated on the nameplate which located on the side panel of the unit Please refer to the nameplate before selecting the cable fuse and switch 12 6 3 Pipe length and the elevation Standard Additional Capacity MWCOHCS30S MRCOHCS30AS 5 8 MW COHC36S MRCOHC36AS 015 9 Indoor unit Caution The capacity test is based on standard length and the maximum permissive length is based on the system reliability Oil trap should be installed per 5 7 meters 13 6 4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below Pressure in the system rises Operating current rises Cooling or heating efficiency drops Moisture in the refrigerant circuit may freeze and block capillary tubing Water may lead to corrosion of parts in the refrigerant system Therefore the indoor units and the pipes between indoo
8. For the definite resistance value of the motor please contact the technical engineer Index2 1 Indoor AC Fan Motor Power on and set the unit running in fan mode at high fan speed After running for 15 seconds measure the voltage of pin1 and pin2 If the value of the voltage is less than 100V 208 240V power supply or 50V 115V power supply the PCB must has problems and need to be replaced x Input Terminal Red 1 b Black 2 2 2 White White 3 oo LYVVV o y N Black EN P 42 9 2 4 Open or short circuit of temperature sensor diagnosis and solution E5 E6 Check the connections between temperature Are the connections sensor and main PCB No good Yes y Check the resistance value Correct the connections of the sensor via table1 Yes and table 2 is it normal No Replace the sensor check if the problem happen again Replace indoor or outdoor main PCB 43 9 2 5 IPM malfunction or IGBT over strong current protection diagnosis solution PO Check if the wiring between main PCB and compressor connected by error and if the wires and connectors Correct the connection or Yes replace the wires and are broken connectors No Y Correct the installation Check if the IPM installed cor
9. the neighborhoods lt may cause a problem for your neighbors B Use two or more people to lift and transport the product Avoid personal injury B Donotinstall the product where it will be exposed to sea wind salt spray directly It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins could cause product malfunction or inefficient operation gt Operational B Donotexpose the skin directly to cool air for long periods of time Do not sit in the draft This could harm to your health B Do not use the product for special purposes such as preserving foods works of art etc It is a consumer air conditioner not a precision refrigerant system There is risk of damage or loss of property B Donot block the inlet or outlet of air flow It may cause product failure B Use a soft cloth to clean Do not use harsh detergents solvents etc There is risk of fire electric shock or damage to the plastic parts of the product Do not touch the metal parts of the product when removing the air filter They are very sharp There is risk of personal injury B Do not step on or put anything on the product outdoor units There is risk of personal injury and failure of product B Always insert the filter securely Clean the filter every two weeks or more often if necessary A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage
10. The operation frequency of compressor after starting submits to following rule Fmax F10 After AC starts up the compressor will run at the Fmax frequency for 7 minutes according to outdoor ambient temp During the 7 minutes frequency limitation is available 7 minutes later compressor running frequency will be controlled as below 29 1 6 v H While ro Ap 0 as factory setting Note When T1 Ts keeps in the same temp zone for 3 minutes the compressor will run as the below rules A E Increase the frequency to the higher level until to F10 F Keep the current frequency G Decrease the frequency to the lower level until to F1 Run at F1 for 1h if T1 Ts AT gt 60 compressor will stop Meanwhile the compressor running frequency is limited by the current 4 EM d Decrease IZHEAT Off Compressor stop 30 Decrease Running frequency decrease to lower level Hold Keep the current frequency Resume No limitation for frequency Note When is in hold zone for 3 minutes the compressor frequency will rise to the higher level frequency increases twice at most 8 4 3 2 Outdoor fan running rules Low 17 15 High 8 4 3 3 Indoor fan running rules 44 38 af setting fan speed low
11. aluminum fin Anti rust cabinet Valve protection cover PTC Heating Belt O Compressor Crankcase Heater O O optional function 3 Dimension 3 1 Indoor Unit TT MWCOHC30S MRCOHC30AS iz Eus MWCOHC36S MRCOHC36AS 4018405 7050 2 7 eo m e eo Le O Co NS lt gt p 2 2 7 Ci ii 2 di O O O O O O O e O 2 amp 2 amp 2 Z 2 I P O C _ e 2 4 41 i p Y o E o D 2 o YU 35 63630 5 3 2 Outdoor Unit Air inlet a Air ou
12. indoor main PCB Power on Is the error extinguished Power on Is the error extinguished No No Y Y Change the indoor main PCB Change the outdoor main PCB 40 9 2 3 Indoor fan speed has been out of control diagnosis solution E3 Shut off the power supply and turn it on 5 seconds No later Is it still displaying v The unit operates normally the error code 41 Yes Y Find out the cause and Shut off the power supply ps 2 rotate the fan by hand No pie ise Does it rotate properly whether the fan blocked or the bearing is broken Yes Check the wires of fan motor Are all the No gt Correct the connections connections good Yes If the Check whether the fan malfunction is Replace the fan motor is normal through No gt still existing motor index 1 replace the 1 4 main PCB No Yes Y Replace the Check whether the main PCB is main PCB gt normal through index 2 malfunction is solved Yes Index 1 1 Indoor AC Fan Motor Measure the resistance value of each winding by using the tester di b y Red N Input Terminal k Red 1 Black 2 White 3 EE 22 Black
13. this mode and turns off 8 4 8 2 Operation process in sleep mode is as follow After pressing ECONOMIC or SLEEP button on controller the machine will turn into sleep mode When cooling the setting temperature rises 10 be lower than 307 every one hour 2 hours later the setting temperature stops rising and indoor fan is fixed as low speed 8 4 8 3 Timer setting is available 8 4 8 4 When user uses timer off function in sleep mode or sleep function in timer off mode if the timing is less than 7 hours sleep function will be cancelled when reaching the setting time If the timing is more than 7 hours the machine will not stop until reaches the setting time in sleep mode 8 4 9 Auto Restart function The indoor unit is equipped with auto restart function which is carried out through an auto restart module In case of a sudden power failure the module memorizes the setting conditions before the power failure The unit will resume the previous operation setting not including Swing function automatically after 3 minutes when power returns If the memorization condition is forced cooling mode the unit will run in cooling mode for 30 minutes and turn to auto mode 247 setting temp If A C is off before power off and AC is required to start up now the compressor will have 1 minute delay when power on Other conditions the compressor will have 3 minutes delay when restarts 8 4 10 Two speeds outdoor
14. 3 way valve to the closed position immediately Do this quickly so that the gauge ends up indicating 0 3 to 0 5Mpa Disconnect the charge set and tighten the 2 way and 3 way valve s stem nuts Use a torque wrench to tighten the 3 way valves service port cap to a torque of 18N m Be sure to check for gas leakage 2 Air purging by the refrigerant Charging cylinder Procedure 1 Confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve Leave the valve on the charging cylinder closed 3 Air purging Open the valves on the charging cylinder and the charge set Purge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds then closing it for 1 minute repeat 3 times After purging the air use a torque wrench to tighten the flare nut on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant 19 Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3 to 0 5 Mpa 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems 7 Mount the valve stems nuts and the service port cap Be sure to use a torque wrenc
15. 34 33 Evaporator temp breeze 24 Penner super breeze stop If the compressor stops caused by room temperature rising indoor fan will be forced to run 127 seconds with breeze During this period anti cold wind is disabled After this anti cold wind function is available If the machine runs in rating capacity test mode indoor fan runs with rating speed and anti cold wind is disabled Indoor fan speed can be set as high medium low or auto grade but anti cold wind function is preferential 31 The auto fan action in heating mode AT room temp setting Temp 8 4 3 4 Defrosting mode The condition of defrosting Condition 1 If T4 gt 00 When the units are running if the following two items are satisfied the units start defrosting The units runs with lt 30 for 40 minutes and keeps lower than 60 for more than minutes The units runs with 3 lt 30 for 80 minutes and keeps lower than 40 for more than minutes Condition 2 If T4 lt 0 The program judges according to the condition 1 if the two items are satisfied then judges if T2 has decreased for more than 50 T2 has decreased for more than 50 enter the defrosting mode Condition 3 No matter what value 4 is if the machine runs with T3 lt 30 for more than 120 minutes
16. Outdoor coil temp T3 sensor Outdoor ambient temp T4 sensor Compressor discharge temp T5 sensor Measure the resistance value of each winding by using the multi meter Table 1 Some frequently used data for T1 T2 T3 and T4 sensor s s w e oo Resistance ae a ss 207 126 s s ss aa Table 2 Some frequently used R T data for T5 sensor Temperature s s s s e e e Resistance a iare se 188 or 5 e7 Resistance value Temperature 47 2 Compressor checking Measure the resistance value of each winding by using the tester pem Input Terminal Blue y Blue 4 2 Red 2 ADU 4 Black Black 3 Red Fi Resistance Value DA250S2C 30MT TNB306FPGMC L 0 550 0 530 20 20 C 3 Indoor AC Fan Motor Measure the resistance value of each winding by using the tester Input Terminal CL ack Blue Brown Yellow 2 Red Blue L Position Resistance Value 810 896 20 C 75 50 8 20 C 48
17. abnormally 2 Room relative humidity less than 80 If the air conditioner operates in excess of this figure the surface of the air conditioner may attract condensation Please set the vertical air flow louver to its maximum angle vertically to the floor and set HIGH fan mode 3 Optimum performance will be achieved within this operating temperature 23 8 Electronic function 8 1 Abbreviation T1 Indoor room temperature T2 Coil temperature of evaporator T3 Coil temperature of condenser T4 Outdoor ambient temperature T5 Compressor discharge temperature 8 2 Display function 8 2 1 Icon explanation on indoor display board Signal receptor j m Ha AUTON Er m NEN FREIEN TL caa pu T cn D Auto indicator This indicator illuminates when the air conditioner is in AUTO operation 2 Timer indicator This indicator illuminates when TIMER is set ON OFF 8 PRE DEF Indicator This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating mode 4 TEMPERATURE indicator Usually it displays the temperature settings When change the setting temperature this indicator begins to flash and stops 20 seconds later It displays the room temperature when the air conditioner is in FAN only operation and the range of th
18. acuate 6 Make evacuation for 30 minutes and check whether the compound meter indicates 0 1 Mpa If 14 the meter does not indicate 0 1 after pumping 30 minutes it should be pumped 20 minutes more If the pressure can t achieve 0 1Mpa after pumping 50 minutes please check if there are some leakage points Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump Confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 7 Turn the flare nut of the 3 way valves about 45 counterclockwise for 6 or 7seconds after the gas coming out then tighten the flare nut again Make sure the pressure display in the pressure indicator is a little higher than the atmosphere pressure Then remove the charge hose from the 3 way valve 8 Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve 2 Air purging by refrigerant Outdoor unit 0 Pe cylinder Procedure 1 Confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve 3 Air purging Open the valves on the charging cylinder and the charge set Purge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds then closing it for 1 minute repeat 3 times After purging the air use a torque wrench to tighten th
19. and no setting temperature is displayed 3 Indoor fan can be set to high med low auto 4 The louver operates same as in cooling mode 5 Auto fan The action of auto fan in fan only mode is the same as auto fan in cooling mode with 241 setting temperature 8 4 2 Cooling Mode 8 4 2 1 Compressor running rules The operation frequency of compressor after starting submits to the following rule 26 NA FmaxzF8 FmaxzF6 Fmax F3 If users switch on AC by remote controller the compressor will run at the Fmax frequency for 7 minutes according to outdoor ambient temp During the 7 minutes frequency limitation is active 7 minutes later the compressor running frequency will be controlled as below While Note When the value of T1 minus Ts keeps in the same temp zone for 3 minutes the compressor will run as the below rules 27 A E Increase the frequency to the higher level until to F8 F Keep the current frequency G Decrease the frequency to the lower level until to F1 Run at F1 for 1h if T1 Ts lt 21 compressor will stop Meanwhile the compressor running frequency is limited by the current Current A Compressor off Frequency decrease Frequency hold Normal operation Off Compressor stops Decrease Decrease the running frequency to the lower l
20. at is 0 5011 When the unit stops operation it returns to original factory settings It will also display the codes when malfunction or protection happen 5 Frequency indicator This indicator appears only when the compressor is in operation and indicates the current operating 24 frequency 8 2 2 LED display control function Pressing LED display button on remote controller will turn off all displays on indoor unit while pressing once again all displays will resume 8 3 Main Protection 8 3 1 Three Minutes Delay at restart for compressor 1 minute delay for the 1st time start up and 3 minutes delay for others 8 3 2 Temperature protection of compressor top Top temp protector cut off for 30s and restart the compressor with 3 minutes delay 8 3 3 Temperature protection of compressor discharge When the compressor discharge temp is getting higher the running frequency will be limited as below rules Compressor discharge temp 15 gt 1150 for 5s compressor stops 108 lt 15 lt 1150 decrease the frequency to the lower level every minutes 90 lt 5 lt 10511 keep running at the current frequency E T5 90 no limit for frequency 8 3 4 Fan Speed is out of control When Indoor Fan Speed keeps too low or too high for certain time the unit will stop and the LED will display the failure 8 3 5 Inverter module Protection The I
21. charging cylinder onto the electronic scale and record the weight 4 Operate the air conditioner at the cooling mode 5 Open the valves Low side on the charge set and charge the system with liquid refrigerant 17 6 When the electronic scale displays the proper weight refer to the gauge and the pressure of the low side disconnect the charge hose from the 3 way valve s service port immediately and turn off the air conditioner before disconnecting the hose 7 Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage 6 6 Re installation while the indoor unit need to be repaired 1 Collecting the refrigerant into the outdoor unit E Outdoor unit Procedure 1 Confirm that both the 2 way and 3 way valves are set to the opened position Remove the valve stem caps and confirm that the valve stems are in the opened position Be sure to use a hexagonal wrench to operate the valve stems 2 Connect the charge hose with the push pin of handle lo to the 3 way valves gas service port 3 Air purging of the charge hose Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it quickly 4 Set the 2 way valve to the close position 18 5 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0 1MPa 6 Set the
22. e flare nut on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant 15 Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3 to 0 5 Mpa 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems 7 Mount the valve stems nuts and the service port cap Be sure to use a torque wrench to tighten the service port cap to a torque 18N m Be sure to check the gas leakage 3 Adding the refrigerant if the pipe length gt 5m Pe r UR Y NUT Indoor unit Y side wap Outdoor unit a 2 9s 2 way valve n d pu Charging cylinder 1 Electronic scale Procedure 1 Connect the charge hose to the charging cylinder open the 2 way valve and the 3 way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure the liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder on
23. evel Hold Keep the current frequency Resume No limitation for frequency Note When AC is in hold zone for 3 minutes the compressor frequency will rise to the higher level The frequency will increase twice at most 8 4 2 2 Indoor fan running rules In cooling mode indoor fan runs all the time and the speed can be selected as high medium low and auto Auto fan in cooling mode acts as follow Room temp Setting temp medium 28 8 4 2 3 Condenser high temperature T3 protection When 550 lt 73 lt 600 the compressor frequency will decrease to the lower level until to F1 and then runs at F1 When lt 54 the compressor will keep running at the current frequency When 3 lt 5211 1 compressor will not limit the frequency and resume to the former frequency When 3 gt 6001 for 5 seconds the compressor will stop until 3 lt 520 8 4 2 4 Evaporator low temperature T2 protection When 2 lt 00 the compressor will stop and restart when 2 gt 50 When 2 lt 40 the compressor frequency will be limited and decreased to the lower level every minute When 411 lt 2 lt 711 compressor will keep the current frequency When 2 gt 7 1 the compressor frequency will not be limited 8 4 3 Heating Mode 8 4 3 1 Compressor running rules
24. fan function 8 4 10 1 Outdoor fan starts at the same time with compressor but stops 30 seconds later after compressor stop 8 4 10 2 Outdoor fan action in heating mode including heating in auto mode 36 E a 1 o E rz gt un s 5 5 5 5 E E 5 8 3 Outdoor fan action in heating mode Outdoor fan action in cooling amp drying mode including heating in auto mode including cooling auto amp forced mode 8 4 10 3 Outdoor fan action in cooling amp drying mode including cooling in auto amp forced mode Please refer to the picture above 3 9 Troubleshooting 9 1 Indoor Unit Error Display Display Note LED STATUS EEPROM parameter error Indoor outdoor units communication protection Indoor fan speed has been out of control Open circuit or short circuit of outdoor temperature sensor Open circuit or short circuit of room or evaporator temperature sensor IPM malfunction or IGBT over strong current protection Outdoor temperature is lower than 15 optional function Over voltage or too low voltage protection Inverter compressor drive error P3 If the outdoor temperature 15 C for 1 hour then the machine stops running the indoor display shows the error code P3 The unit can still receive remote control signals If the outdoor gt 12 C for 10 minutes the compressor stops running more than one hour Or the outdoor temperature gt 5 fo
25. h to tighten the service port cap to a torque 18N m Be sure to check the gas leakage 6 7 Re installation while the outdoor unit need to be repaired 1 Evacuation for the whole system Outdoor unit fo valve Sc i Vacuum pump Procedure 1 Confirm that both the 2 way and 3 way valves are set to the opened position 2 Connect the vacuum pump to 3 way valve s service port 3 Evacuation for approximately one hour Confirm that the compound meter indicates 0 1 4 Close the valve Low side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 5 Disconnect the charge hose from the vacuum pump 20 2 Refrigerant charging ok T aa p wg Indoor unit quid side Outdoor unit umZ da valve Gas sida NA Check valve pen Sog Charging cylinder X Electronic scale Procedure 1 Connect the charge hose to the charging cylinder open the 2 way valve and the 3 way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom
26. installation while the indoor unit need to 18 6 7 Re installation while the outdoor unit need to be 20 7 0 23 n 24 8 9 81 m 24 215 X 24 8 9 MaM PrOteChON yrsg E TTE 25 8 4 Operation Modes and f UriclloriS soo aser suos Chase tir accu d Recap dedo 26 OIL LIED 38 SM aeree dibiniiisqie Bec 38 9 2 Diagnosis and 5 39 1 Precaution 1 1 Safety Precaution B To prevent injury to the user or other people and property damage the following instructions must be followed B Incorrect operation due to ignoring instruction will cause harm or damage B X Before service unit be sure to read this service manual at first 1 2 Warning Installation B Do not use a defective or underrated circuit breaker Use this appliance on a dedicated circuit There is risk of fire or electric shock B For electrical work contact the dealer seller a qualified electrician or an authorized service ce
27. may condense and wet or damage furniture B care to ensure that power cable could not be pulled out or damaged during operation There is risk of fire or electric shock B Do not place anything on the power cable There is risk of fire or electric shock B Donot plug or unplug the power supply plug during operation There is risk of fire or electric shock Do not touch operation the product with wet hands There is risk of fire or electric shock B Donot place a heater or other appliance near the power cable There is risk of fire and electric shock B Do not allow water to run into electric parts It may cause fire failure of the product or electric shock B Do not store or use flammable gas or combustible near the product There is risk of fire or failure of product B Donotuse the product in tightly closed space for a long time Oxygen deficiency could occur B When flammable gas leaks turn off the gas and open a window for ventilation before turn the product on Do not use the telephone or turn switches on or off There is risk of explosion or fire B if strange sounds or small or smoke comes from product Turn the breaker off or disconnect the power supply cable There is risk of electric shock or fire B Stop operation and close the window in storm or hurricane If possible remove the product from the window before the hurricane arrives There is risk of property damage failure of produc
28. mode pressing touch button will turn off the machine In forced operation remote control is available 8 4 6 3 In forced operation mode all general protections is available 8 4 6 4 The compressor runs at F2 frequency and indoor fan runs as breeze After running for 30 minutes the machine will turn to auto mode as 240 setting temperature 8 4 6 5 The action of forced auto mode is the same as normal auto mode which temperature is 24 First press Press once Press once Forced auto Forced cooling gt Press once 8 4 7 Timer function 8 4 7 1 Timing range is 24 hours and the minimum resolution is 15 minutes 8 4 7 2 Timer on After turning off the machine will turn on automatically when reaching the setting time 8 4 7 3 Timer off After turning on the machine will turn off automatically when reaching the setting 35 time 8 4 7 4 Timer on off After turning off the machine will turn on automatically when reaching the setting on time and then turn off automatically when reaching the setting off time 8 4 7 5 Timer off on After turning on the machine will turn off automatically when reaching the setting off time and then turn on automatically when reaching the setting on time 8 4 7 6 The setting time is relative time 8 4 7 7 The tolerance of timer is 1 minute per hour 8 4 8 Sleep function mode 8 4 8 1 Operation time in sleep mode is 7 hours After 7 hours the AC quits
29. nter Do not disassemble or repair the product there is risk of fire or electric shock B Always ground the product There is risk of fire or electric shock B install the panel and the cover of control box securely There is risk of fire of electric shock B Always install a dedicated circuit and breaker Improper wiring or installation may cause fore or electric shock B Use the correctly rated breaker of fuse There is risk of fire or electric shock B Do not modify or extend the power cable There is risk of fire or electric shock B Donotinstall remove or reinstall the unit by yourself customer There is risk of fire electric shock explosion or injury B Be caution when unpacking and installing the product Sharp edges could cause injury be especially careful of the case edges and the fins on the condenser and evaporator B For installation always contact the dealer or an Authorized service center There is risk of fire electric shock explosion or injury B Do not install the product on a defective installation stand It may cause injury accident or damage to the product B sure the installation area does deteriorate with age If the base collapses the air conditioner could fall with it causing property damage product failure and personal injury B Do not let the air conditioner run for a long time when the humidity is very high and a door or a window is left open Moisture
30. nverter module itself has a protection function against current voltage and temperature If these protections happen the corresponding code will display on indoor unit 8 3 6 Indoor fan delayed open function When the system starts up the louver will be active immediately and the indoor fan will open 10s later 8 3 7 Compressor preheating functions Preheating permitting condition If T4 outdoor ambient temperature lt 3 and the machine connects to power supply newly or if T4 lt 3 and compressor has stopped for over 3 hours the compressor heating cable will work Preheating mode 25 A weak current flow through the coil of compressor from the wiring terminal of compressor then the compressor is heated without operation Preheating release condition If 4 gt 511 or the compressor starts running preheating function will stop Heating cable It starts when T4 5 and stops when T4215 8 3 8 Zero crossing detection error protection If AC detects time interval is not correct for continuous 20 zero crossing signal the unit will stop and the LED will display the failure The correct zero crossing signal time interval should be between 6 13ms 8 3 9 Sensor protection at open circuit and breaking disconnection 8 4 Operation Modes and Functions 8 4 1 Fan mode 1 Outdoor fan and compressor stop 2 Temperature setting function is disabled
31. of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Open the valves Low side on the charge set and charge the system with liquid refrigerant If the system cannot be charge with the specified amount of refrigerant or can be charged with a little at a time approximately 150g each time operating the air conditioner in the cooling cycle however one time is not sufficient wait approximately 1 minute and then repeat the procedure 5 When the electronic scale displays the proper weight disconnect the charge hose from the 3 way valve s service port immediately If the system has been charged with liquid refrigerant while operating the air conditioner turn off the air conditioner before disconnecting the hose 6 Mounted the valve stem caps and the service port 21 Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage 22 7 Operation characteristics Cooling operation i operation Drying operation Room temperature 7 gt 10 NEN NEN C 50 C 15 50 C For the Outdoor temperature models with low 15 30 temperature cooling CAUTION 1 If air conditioner is used outside of the above conditions certain safety protection features may come into operation and cause the unit to function
32. r 10 minutes then AC will recover to the last mode and fan speed E4 Reserved function 38 9 2 Diagnosis and Solution 9 2 1 EEPROM parameter error diagnosis and solution E0 Shut off the power supply and turn it on 5 seconds later Is it still displaying the error code Yes Y If the EEPROM chip is welded on main PCB replace the main PCB directly Otherwise check No Correct the connection whether the EEPROM chip plugged in main PCB well Yes Y Replace the indoor main PCB EEPROM a read only memory whose contents can be erased and reprogrammed using a pulsed voltage 39 9 2 2 Indoor unit and outdoor unit communication protection error diagnosis and solution E1 Power off then turn on the unit 5 seconds later reconnect the power wire Is the error still displaying after several minutes Yes Y Check all the wirings between indoor and outdoor indoor main PCB and outdoor main PCB following the wiring diagram Are all the wirings connected correctly Yes Y Measure Vs is it moving alternately between positive value and negative Vs is the voltage between 5 of outdoor unit Yes Y Is the wiring to the outdoor main Is the wiring to the indoor main PCB connected correctly PCB connected correctly Yes Yes Y Change the outdoor main PCB Change the
33. r and outdoor units must be leak tested and evacuated to remove gas and moisture from the system Gas leak check Soap water method Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit connections by a soft brush to check for leakage of the connecting points of the piping If bubbles come out the pipes have leakage 1 Air purging with vacuum pump Indoor unit we Liquid side p Outdoor unit e ime 1 2 Two way valve f lii 5 Close Gas side 3 5 5 Three way valve Manifold valve cJ Close Compound meter M mm Pressure 0 1 Mee Q Handelo T Handle Hi Charge hse Charge hose 3 W E Vacuum E e l pump 1 Completely tighten the flare nuts of the indoor and outdoor units confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge hose with the push pin of handle lo to the 3 way valves gas service port 3 Connect the charge hose of handle hi connection to the vacuum pump 4 Fully open the handle Lo of the manifold valve 5 Operate the vacuum pump to ev
34. rectly No tighten the screws and apply silicon grease Yes y IPM continuity check Check if the Replace the IPM board or replace the main PCB if the IPM board and uniform main PCB are integrated together Yes IPM terminal resistance values are No y Refer to the solution of fan speed Check if the outdoor fan runs 3 has been out of control 2 zu No malfunction Find out the cause 9 have it solved Yes v Check if the compressor resistance values are uniform Yes Y Replace the outdoor main PCB if the No Replace the compressor main PCB and IPM are separate 44 9 2 6 Over voltage or too low voltage protection diagnosis and solution P1 normal Yes lt Check if the power supply is No if all the connections No and wires are good Yes Power and when the unit 15 in standby check if the voltage between P and N is around DC 310V or 340V or 380V For different Disconnect the unit with power supply and try to restart the unit when power supply gets normal Correct the connections or replace the wires kinds of units the voltage differs Consult with technical engineer to get definite value Then start up the unit measure the voltage between P Is it in 220V 400V Yes Y Replace outdoor mainl PCB
35. t or electric shock B Donot open the inlet grill of the product during operation Do not touch the electrostatic filter if the unit is so equipped There is risk of physical injury electric shock or product failure B When the product is soaked flooded or submerged contact an Authorized service center There is risk of fire or electric shock B Be caution that water could not enter the product There is risk of fire electric shock or product damage B the product from time to time when operating it together with a stove etc There is risk of fire or electric shock B Turn the main power off when cleaning or maintaining the product There is risk of electric shock B When the product is not be used for a long time disconnect the power supply plug or turn off the breaker There is risk of product damage or failure or unintended operation B X Take care to ensure that nobody could step on or fall onto the outdoor unit This could result in personal injury and product damage CAUTION B Always check for gas refrigerant leakage after installation or repair of product Low refrigerant levels may cause failure of product B Install the drain hose to ensure that water is drained away properly A bad connection may cause water leakage B Keep level even when installing the product It can avoid vibration of water leakage B Do not install the product where the noise or hot air from the outdoor unit could damage 3
36. tlet x LL MWCOHC30S MRCOHC30AS 860 590 MWCOHC36S MRCOHC36AS 4 Refrigerant Cycle Diagram INDOOR OUTDOOR 4 _ CHECK VALVE LIQUID SIDE Heating Model only 4 COO 2 WAY VALVE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE EVAPORATOR CONDENSER p 7 t GAS SIDE k3 ISS v 3 WAY VALVE REVERSING VALVE Heating Model only ACCUMULATOR 4 COOLING COMPRESSOR 4 HEATING 5 Wiring Diagram 5 1 Indoor Unit MWCOHCSOS MRCOHCS30AS MWCOHC36S MRCOHC36AS RED YELLOW Y G Y G OUTDOOR UINT Doce 202033090856 uus S IN FAN OPTIONAL ION QD ie T ef gj e eed 2 En En ES d S 27 nd CN5 4 CN1 S CN2 ie 54 K INDOOR Fa K 5 CN42 4 Earth CN6 2 S aK 2 TRANSFORMER 4 RA o d OPTIONAL PLASMA 10 3 SWITCH BOARD SWING MOTOR 5 10 DISPLAY BOARD M DECORATIVE LOUVER MOTOR DECORATIVE LOUVER MOTOR ae 5 2 Outdoor Unit MW COHC30S MRCOHC30AS 202038090667 OUTDOOR COMPRESSORDISCHARGE TEMP SENSOR 5 2 p pp ne ELUNEI OUTDOOR ROOM TEMP SENSOR CN18 Tb p 7 Aa OUTDOOR HEAT EXCHANGER TEMP SENSOR BLUH RED BLACK 6 f
37. to the electronic scale and record the weight 4 Operate the air conditioner at the cooling mode 5 Open the valves Low side on the charge set and charge the system with liquid refrigerant 16 6 the electronic scale displays the proper weight refer to the table disconnect the charge hose from the 3 way valve s service port immediately and turn off the air conditioner before disconnecting the hose 7 Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage 6 5 Adding the refrigerant after running the system for many years Sail See Indoor unit T Outdoor unit he way valve ae g gt 4 valve 8 lj eg ai p Charging HP cylinder E EN UU pm d OPEN j LA 5 xx X Electronic scale Procedure 1 Connect the charge hose to the 3 way service port open the 2 way valve and the 3 way valve Connect the charge hose to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the
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