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MDV RM2-053B-OU, Service Manual

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MDV RM2-053B-OU Service Manual Download Page 51

50 

 

10.4 Main parts check 

1.  Temperature sensor checking 

Disconnect the temperature sensor from PCB, measure the resistance value with a tester. 

Temperature Sensors. 

Room temperature(T1) sensor, 

Indoor coil temperature(T2) sensor, 

Outdoor coil temperature(T3) sensor, 

Outdoor ambient temperature(T4) sensor, 

Compressor discharge temperature(T5) sensor. 

Measure the resistance value of each winding by using the multi-meter. 

 

 

Summary of Contents for RM2-053B-OU

Page 1: ...SERVICE MANUAL MDV AIRCONDITIONER SUPER DC INVERTER MULTI TYPE RM2 053B OU RM3 079B OU RM4 108B OU DC MULTI OUTDOOR UNITS...

Page 2: ...eet for installation 14 8 2 Connecting the cables 14 8 3 Pipe length and the elevation 14 8 4 Installation for the first time 15 8 5 Adding the refrigerant after running the system for many years 18 8...

Page 3: ...2 1 General information of Outdoor Units Model name Dimension mm Compressor RM2 053B OU 800x333x554 KSM135D23UFZ RM3 079B OU 845x363x702 KTF235D22UMT RM4 108B OU 946x410x810 KTF310D43UMT...

Page 4: ...dripping Power relay control Low noise air flow system Hydrophilic aluminum fin The hydrophilic fin can improve 4 way valve control Outdoor unit It is only operated in the heating operation mode excep...

Page 5: ...4 3 Dimensions A D B Model Unit mm W D H W1 A B RM2 053B OU 800 333 554 860 514 340 RM3 079B OU 845 363 702 923 540 350 RM4 108B OU 946 410 810 1034 673 403...

Page 6: ...A Evaporator C o presser temp sensor H EAT EXCHANGE CONDENSER _ COO LING HE ATING L _J L _ J 4 2 Refrigeration circuit drawing of inverter 1 drive 3 type 7 EXV A CAPILLARY A 7 EXV B CAPILLARY B CHECK...

Page 7: ...p sensor middle 4 4 Refrigeration circuit drawing of inverter 1 drive 5 type IN D O O R O UT D O O R i 7 i EXV A CAPILLARY A 7 EXV B CAPILLARY B CHECK VALVE CA P IL L A R Y TUBE HEAT EXC H A NG E EVAP...

Page 8: ...s symbol indicates the element VALVE A o 0 0 z 0 0 0 0 0 0 0 t 0 w 0 0 0 r 0 n om O Z o 0 J ELECTRONIC EXPANSIVE is optional the actual shape shall VALVE be prevail CN 1 2 CN2 A INDOOR PIPE B OUT TEMP...

Page 9: ...SENSOR CN37 CONDENSER 13 TEMPERATURE SENSOR r J DISCHARGESENSOR CN4 CNS MAIN BOARD CN2 1PM BOARD CN3 CN1 VALVE B Y 0 ELECTRONIC EXPANSIVE VALVE LECTRONIC PANS I VE VALVE A Y I ELECTRONIC ANSIVE VALVE...

Page 10: ...BLACK MAIN BOARD BLUE C N52 _ YELLOW YELLOW L RM4 108B OU CODE PART NAME CODE PART NAME COMP COMPRESSOR PFC INDUCTOR CAP1 FAN MOTOR CAPACITOR L PRO LOW PRESSURE SWITCH EEV ELECTRIC EXPANSIVE VALVE TP...

Page 11: ...PRO LOW PRESSURE SWITCH EEV ELECTRIC EXPANSIVE VALVE TP EXHAUST TEMPERATURE SENSOR FM1 OUTDOOR DC FAN sv 4 WAY VALVE FAN1 OUTDOOR AC FAN T3 CONDENSER TEMPERATURE SENSOR HEAT CRANKCASE HEATING T4 OUTD...

Page 12: ...for RM4 108B OU One unit Two unit Three unit Four unit 7 7 7 9 18 7 7 7 7 9 18 9 9 12 12 12 12 7 7 7 7 7 7 9 24 7 9 12 12 9 9 12 12 9 7 9 9 24 7 7 9 7 9 24 9 9 18 12 12 18 7 7 7 9 7 7 12 12 7 9 12 18...

Page 13: ...12...

Page 14: ...13 Microphone H 7 Sound Levels Outdoor Unit 1 0m Note H 0 5 height of outdoor unit Model Noise Power dB A Noise level dB A RM2 053B OU 56 53 RM3 079B OU 65 59 RM4 108B OU 68 63...

Page 15: ...the side panel of the unit Please refer to the nameplate before selecting the cable fuse and switch 8 3 Pipe length and the elevation Maximum piping length and height difference 1 drive 2 1 drive 3 1...

Page 16: ...iquid 6 35 1 4 5 Gas 9 52 3 8 4 12 7 1 2 1 8 4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below Pressure in the system rises Operating curre...

Page 17: ...lease 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...

Page 18: ...harge 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 Operate the air conditioner at the cooling mode 5 Open the...

Page 19: ...careful of the liquid refrigerant 3 Put the 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...

Page 20: ...rvice 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 t...

Page 21: ...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...

Page 22: ...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 1Mpa 4 Close the valve Low side on the charge set t...

Page 23: ...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...

Page 24: ...function In standby the LED displays In compressor operation the LED display the running frequency In defrosting mode The LED displays dF or alternative displays between running frequency and dF each...

Page 25: ...A evaporator outlet temperature T2BA If the temperature is lower than 9 the digital display shows 9 If the temperature is higher than 70 the digital display shows 70 If the indoor unit is not connecte...

Page 26: ...y T2 Bit3 Frequency limit caused by T3 Bit2 Frequency limit caused by T5 Bit1 Frequency limit caused by current Bit0 Frequency limit caused by voltage 43 Average value of T2 Sum T2 value of all indoor...

Page 27: ...urrent limit is same as range of T4 limited frequency Cooling mode T4 C o o lZ o n e 1 Heating mode T4 9 5 5 Indoor outdoor units communication protection If the indoor units cannot receive the feedba...

Page 28: ...equency for setting time and then resume to former frequency 2 The EXV will keep 300p while the indoor units will keep the current running mode If the outdoor ambient is higher than setting frequency...

Page 29: ...5 X 6 Water level alarm EE X 8 Overcurrent protection For some units F0 O 1 Open or short circuit of T4 temperature sensor F1 O 2 Open or short circuit of T3 temperature sensor F2 O 3 Open or short ci...

Page 30: ...tween the indoor PCB and display board Eb Overload current protection F0 Outdoor ambient temperature sensor T4 open circuit or short circuit F1 Condenser coil temperature sensor T3 open circuit or sho...

Page 31: ...of sensor is defective F3 No C Indoor unit coil outlet temperature sensor or connector of sensor is defective F4 No D Indoor unit coil outlet temperature sensor or connector of sensor is defective F5...

Page 32: ...it 10 3 1 1 Indoor EEPROM malfunction Yes EEPROM An electrically erasable programmable read only memory whose contents can be erased and reprogrammed using a pulsed voltage Power off then restart the...

Page 33: ...indoor units Is IPM power LED or operating LED lamp No On Refer PIC2 Yes Power on by remote controller IIs it still displaying the error code after 3 minutes Is main board lamp on Refer PIC 3 Is the r...

Page 34: ...1 check the voltage of N to S Vs is it moving alternately between positive value and negative value Pic 2 IPM or outdoor main PCB Operating Self Check Pic 2 IPM or outdoor main PCB Power Self Check Op...

Page 35: ...34 PIC3 Main board LED when power on and unit standby PIC 4 check point button Press 1 time for check how many indoor units are connected...

Page 36: ...m m mp p plle e e w wh he etth he errtth he effa an n iis sb bllo oc ck ke ed do orrtth he es sc crre ew ws s w wh hiic ch hffiix xtth he effa an na arre e t ti iggh htt eenn S S Sh h hu u ut t t o o...

Page 37: ...r Signal Voltage 1 Red Vs Vm 280V 380V 2 3 Black GND 0V 4 White Vcc 14 17 5V 5 Yellow Vsp 0 5 6V 6 Blue FG 14 17 5V For other types NO Color Signal Voltage 1 Red Vs Vm 192V 380V 2 3 Black GND 0V 4 Whi...

Page 38: ...r a a an n nd d d P P PC C CB B B A A Ar r re e e t t th h he e e c c co o on n nn n ne e ec c ct t tiio o on n ns s s g g go o oo o od d d Yes C C Co o or r rr r re e ec c ct t t t t th h he e e c c...

Page 39: ...ecting line between main board and the PFC No module IPM module is connected tightly 10 3 1 7 Communication error between the indoor PCB and display board Yes Yes Yes Replace the Display board Replace...

Page 40: ...rogrammable read only memory whose contents can be erased and reprogrammed using a pulsed voltage R R Re e ep p plla a ac c ce e e t t th h he e e o o ou u ut t td d do o oo o or r r m m ma a aiin n n...

Page 41: ...board and the main board is it connected good Yes No Yes Reconnect and retry Is error still display No No Replace IPM board and then check whether the system can run normally Yes No Replace outdoor m...

Page 42: ...Replace bridge rectifiers and then check whether the system can run normally Yes Yes No Replace IPM board and then check whether the system can run normally Yes No Trouble is solved Replace outdoor ma...

Page 43: ...must have problems and need to be replaced DC motor voltage input and output NO Color Signal Voltage 1 Red Vs Vm 140V 380V 2 3 Black GND 0V 4 White Vcc 13 5 16 5V 5 Yellow Vsp 0 6 5V 6 Blue FG 15V Fin...

Page 44: ...Yes C C Ch h he e ec c ck k k iif ff t t th h he e e o o ou u ut t td d do o oo o or r r f ffa a an n n r r ru u un n ns s s p p pr r ro o op p pe e er r rlly y y No Yes C C Ch h he e ec c ck k k w w...

Page 45: ...ance of the llow pressure protector If the protector iis normall the vallue iis o No Yes Check whether the outdoor ambiient temperature iis too llow Yes Low pressure protection Repllace llow pressure...

Page 46: ...refrigerant to blow pipe vacuumize and charge the refrigerant again Judge 1 Check whether the input current of the power supply wire is higher than max protection current value Yes Check whether the r...

Page 47: ...t 10 3 3 8 Temperature protection of compressor discharge ODU P4 Yes Yes No M M Me e ea a as s su u ur r re e e tth h he e e r r re e es s siis s stta a an n nc c ce e e v v va a allu u ue e e o o off...

Page 48: ...er r r tth h he e e o o ou u uttd d do o oo o or r r a a am m mb b biie e en n ntt tte e em m mp p pe e er r ra a attu u ur r re e e iis s s h h hiig g gh h he e er r r tth h ha a an n n 5 5 50 0 0 Y...

Page 49: ...ck whether the bridge rectifiers are normal Use the multimeter to measure the resistance between each two terminals check whether there is the condition that value of resistance is 0 No Check if the o...

Page 50: ...nit get warm Potential causes Faulty EXV Wire and piping connected in reverse Check of EXV please refer to part 5 in 10 4 Trouble Criterion Of Main Parts Automatic correction of wiring piping error Pr...

Page 51: ...e the resistance value with a tester Temperature Sensors Room temperature T1 sensor Indoor coil temperature T2 sensor Outdoor coil temperature T3 sensor Outdoor ambient temperature T4 sensor Compresso...

Page 52: ...1 34105 116 0 40060 3 41 5878 37 5 87359 77 1 29078 117 0 38991 2 39 8239 38 5 62961 78 1 25423 118 0 37956 1 37 1988 39 5 39689 79 1 21330 119 0 36954 0 35 2024 40 5 17519 80 1 17393 120 0 35982 1 33...

Page 53: ...9 5 234 9 35 35 78 75 8 084 115 2 422 4 222 8 36 34 32 76 7 82 116 2 357 3 211 4 37 32 94 77 7 566 117 2 294 2 200 7 38 31 62 78 7 321 118 2 233 1 190 5 39 30 36 79 7 086 119 2 174 0 180 9 40 29 15 80...

Page 54: ...53 2 Compressor checking Measure the resistance value of each winding by using the tester Position Resistance Value KSM135D23UFZ KTF235D22UMT KTF310D43UMT Blue Red 1 72 20 0 75 20 0 65 20...

Page 55: ...tester Normal resistance value Red Black Several M Red Black Several M P N U N U V V W W Red 4 4 way valve 1 Power on use a digital tester to measure the voltage when the unit operates in cooling it...

Page 56: ...55 5 EXV check Disconnect the connectors Resistance to EXV coil Color of lead wire Normal Value Red Blue About 50 Red Yellow Brown Orange 6 5 4 3 2 1 Red Brown Blue Orange Yellow White...

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