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Midea U2MRS-12, Service Manual

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Midea U2MRS-12 Service Manual Download Page 133

 

Troubleshooting 

Electrical Control System 

139 

2.4.4.2

. 

E2 malfunction   

Indoor / outdoor units communication error

E2 display

No

Power off, then turn on the unit 5 

seconds later(reconnect the power 

wire).Is the error still displaying 

after several minutes?

Adopt shield cable/Shield 

cable earthing.

No

Yes

Correct the connection.

No

Yes

Remove interference.

Increase the capacity of anti-

interference

Yes

Yes

Replace the signal wire.

Yes

Pull out and insert back.

No

No

Replace indoor PCB, is the error 

distinguished?

Yes

Replace the outdoor PCB.

No

Check whether there’s any 

interference.

Such as too many lamps, power 
transformers? Or the signal wire 

is too long?

Check whether the signal wire 

is shield cable or whether the 

shield cable is earthing?

Check whether the wire is 

correct polarity? P to P, Q to Q, 

E to E?

Check whether the signal wire 

is broken?

Check whether the signal wires 

insert on PCB well?

 

 
 

Summary of Contents for U2MRS-12

Page 1: ...door Units 7 Super Slim Cassette Type V2MC 1 Features 8 2 Dimensions 12 3 Service Space 13 4 Wiring Diagrams 14 5 Electric Characteristics 15 6 Sound Levels 16 7 Accessories 17 8 The Specification of...

Page 2: ...ifting panel design more convenient to clean and maintain the filter optional Old Cassette New Slim Cassette Reduction 18K 24K 840 230 840 840 205 840 11 30K 840 300 840 840 205 840 32 36K 48K 840 300...

Page 3: ...tched on or off by remote controller When pressing the Clean Air button on the remote controller Ionizer will work and the indicator light on display board will shine New air intake I Io on ni iz ze e...

Page 4: ...rve external air duct more flexible for the air supply 1 5 Built in draining pump Due to the improvement of structure more convenient to repair or replace the draining pump Built in draining pump to m...

Page 5: ...d controller is optional with error code indication function Better man machine conversation interface Undated structure design 4 way wire layout design no raised part at backside more convenient to p...

Page 6: ...Dimensions 12 Indoor Units 2 Dimensions Model A H 18 K 205 235 24 K 30 K 245 275 36 K 245 275 205 235...

Page 7: ...Service Space Indoor Units 13 3 Service Space 1000mm 1000mm 1000mm 1000m m...

Page 8: ...Wiring Diagrams 14 Indoor Units 4 Wiring Diagrams MCD 18HRFN1 QRC4 MCD 18HRFN1 QRC8 MCD 24HRFN1 QRC4 MCD 24HRFN1 QRC8 MCD 30HRFN1 QRC8 MCD 36HRFN1 QRC4 MCD 36HRFN1 QRC8...

Page 9: ...ndoor Units 15 5 Electric Characteristics Model Indoor Unit Power Supply Hz Voltage Min Max MFA 18K 50 220 240 198 254 10 24K 50 220 240 198 254 10 30K 50 220 240 198 254 10 36K 50 220 240 198 254 10...

Page 10: ...Sound Levels 16 Indoor Units 6 Sound Levels 1 4m Microphone Model Noise Power dB A Noise level dB A H M L 18K 58 49 44 40 24K 59 50 45 42 30K 62 52 49 46 36K 65 53 49 46...

Page 11: ...al ring 1 Remote controller Its Frame The product you have might not be provided the following accessories Remote controller Its Frame 1 Remote controller holder 1 Mounting screw ST2 9 10 C H 2 Remote...

Page 12: ...50Hz POWER WIRING mm 2 3 1 0 3 1 0 3 1 0 3 1 0 CIRCUIT BREAKER Fuse A 15 10 15 10 15 10 15 10 OUTDOOR UNIT POWER Phase 1 phase 1 phase 1 phase 3 phase Frequency and Voltage 220 240V 50Hz 220 240V 50Hz...

Page 13: ...Field Wiring Indoor Units 19 9 Field Wiring...

Page 14: ...s Duct Type V2MD 1 Features 21 2 Dimensions 24 3 Service Space 25 4 Wiring Diagrams 26 5 Static Pressure 28 6 Electric Characteristics 30 7 Sound Levels 31 8 Accessories 32 9 The Specification of Powe...

Page 15: ...rear to the bottom in order to matching the installation condition 1 3 Fresh air intake function Optional for 18 60k Install one duct from the reserved fresh air intake to outdoor Continually inhale t...

Page 16: ...mote on off and central control ports Reserved remote on off ports and central control ports can connect the cable of an on off controller or a central controller to realize remote on off control func...

Page 17: ...of 10m The unit will realized remoter control The wired controller and the display board can display the error code or production code when the chips detect some failure 1 8 Twins Combination The uni...

Page 18: ...nsion mm Air outlet opening size Air return opening size Size of outline dimension mounted plug A B C D E F G H I J K L M 12 700 210 635 570 65 493 35 119 595 200 80 740 350 18 24 920 270 635 570 65 7...

Page 19: ...Service Space Indoor Units 25 3 Service Space Ensure enough space required for installation and maintenance All the indoor units reserve the hole to joint the fresh air pipe The hole size as following...

Page 20: ...Wiring Diagrams 26 Indoor Units 4 Wiring Diagrams 12K 12K 24K 30K 36K...

Page 21: ...Wiring Diagrams Indoor Units 27 MTB 24HWDN1 QRC4...

Page 22: ...30 20 10 Low speed 300 400 700 800 Super highspeed 500 400 300 200 Lowspeed 10 20 30 40 50 60 70 80 90 Pa 600 700 800 900 1000 1100 Air volume m h 3 External static pressure Pa Highspeed Midspeed 120...

Page 23: ...tic Pressure Indoor Units 29 36 000Btu h 2400 2200 1600 1400 Low speed 10 20 30 40 50 60 70 80 90 1100 Air volume m h 3 External static pressure Pa High speed Mid speed 1200 1800 2000 Super high speed...

Page 24: ...ts 6 Electric Characteristics Model Indoor Unit Power Supply Hz Voltage Min Max MFA 12K 50 220 240 198 254 16 18K 50 220 240 198 254 10 24K 50 220 240 198 254 10 30K 50 220 240 198 254 10 36K 50 220 2...

Page 25: ...or Units 31 7 Sound Levels Suction Discharge Microphone 1 4m Concealed Duct Type Duct Duct Model Sound Power dB A Noise level dB A H M L 12K 59 41 38 36 18K 59 46 43 41 24K 58 43 38 32 30K 65 50 46 41...

Page 26: ...lation sheath 2 Binding tape 1 Seal sponge 1 Drainpipe Fittings for cooling heating Drain joint 1 Seal ring 1 Wired controller Its Frame Wired controller 1 Others Owner s manual 1 Installation manual...

Page 27: ...RING mm 2 3 1 0 3 1 0 3 1 0 3 1 0 CIRCUIT BREAKER Fuse A 15 10 15 10 15 10 15 10 OUTDOOR UNIT POWER Phase 1 phase 1 phase 1 phase 1 phase 3 phase Frequency and Voltage 220 240V 50Hz 220 240V 50Hz 220...

Page 28: ...Field Wiring 34 Indoor Units 10 Field Wiring 12K 18K 24K 30K 36K...

Page 29: ...oor Units 35 Ceiling Floor Type LV2K 1 Features 36 2 Dimensions 37 3 Service Space 38 4 Wiring Diagrams 39 5 Electric Characteristics 41 6 Sound Levels 41 7 Accessories 42 8 The Specification of Power...

Page 30: ...1 3 Two direction auto swing vertical horizontal and wide angle air flow Air flow directional control minimizes the air resistance and produces wilder air flow to vertical direction The range of hori...

Page 31: ...Dimensions Indoor Units 37 2 Dimensions Capacity Btu h A B C D E 18K 24K 1068 675 235 983 220 30K 36K 1285 675 235 1200 220...

Page 32: ...Service Space 38 Indoor Units 3 Service Space...

Page 33: ...Wiring Diagrams Indoor Units 39 4 Wiring Diagrams MUE 18HRFN1 QRC8 MUE 24HRFN1 QRC8 MUE 30HRFN1 QRC8 MUE 36HRFN1 QRC4 MUE 18HRDN1 QRC4 MUE 24HRDN1 QRC4...

Page 34: ...Wiring Diagrams 40 Indoor Units 36K...

Page 35: ...A 18K 50 220 240 198 254 10 24K 50 220 240 198 254 10 30K 50 220 240 198 254 10 36K 50 220 240 198 254 10 Note MFA Max Fuse Amps A 6 Sound Levels Microphone 1m 1m Air outlet side 1 5m 1m Microphone Ce...

Page 36: ...h 36000 Btu h 36000 Btu h INDOOR UNIT POWER Phase 1 phase 1 phase 1 phase 1 phase Frequency and Voltage 220 240V 50Hz 220 240V 50Hz 220 240V 50Hz 220 240V 50Hz POWER WIRING mm 2 3 1 0 3 1 0 3 1 0 3 1...

Page 37: ...Indoor Units 43 9 Field Wiring...

Page 38: ...MCR 1 Features 45 2 Dimensions 46 3 Service Space 47 4 Wiring Diagrams 48 5 Air Velocity and Temperature Distributions Reference Data 49 6 Electric Characteristics 50 7 Sound Levels 50 8 Accessories 5...

Page 39: ...7 50 647mm The hooks are designed in the four corners of the body which can save installation space 1 3 Electric control box built in design The E box is simply and safely built inside the indoor unit...

Page 40: ...Dimensions 46 Indoor Units 2 Dimensions...

Page 41: ...Service Space Indoor Units 47 3 Service Space...

Page 42: ...Wiring Diagrams 48 Indoor Units 4 Wiring Diagrams 12K 18K...

Page 43: ...Air Velocity and Temperature Distributions Reference Data Indoor Units 49 5 Air Velocity and Temperature Distributions Reference Data Airflowvelocity Temperature...

Page 44: ...odel Indoor Units Power Supply Hz Voltage Min Max MFA MCA2U 12HRFN1 QRC8 50 220 240 198 254 20 MCA2 18HRFN1 QRC8 50 220 240 198 254 20 Notes MFA Max Fuse Amps A 7 Sound Levels 1 4m Microphone Model No...

Page 45: ...T2 9 10 C H 2 Remote controller manual 1 Alkaline dry batteries AM4 2 Others Owner s manual 1 Installation manual 1 Installation accessory The product you have might not be provided the following acce...

Page 46: ...52 Indoor Units 10 Field Wiring 12K 18K...

Page 47: ...Features 55 2 Dimensions 57 3 Service Space 58 4 Wiring Diagrams 59 5 Air Velocity and Temperature Distributions Reference Data 60 6 Electric Characteristics 61 7 Sound Levels 62 8 Accessories 63 9 T...

Page 48: ......

Page 49: ...ed on or room temp is still high cold air will be blown out from top and bottom air outlet to cool down the room quickly Air outlet from top to maintain room temp When the room has been cooled down or...

Page 50: ...1 5 Low noise DC indoor fan motor which has five speeds Low noise and energy saving Advanced centrifugal fan technology makes a fast airflow and reduces the indoor noise lower to 28dB 1 6 Golden fin...

Page 51: ...Dimensions Console Type 57 2 Dimensions MFAU 12HRFN1 QRC8 MFA 16HRFN1 QRC8...

Page 52: ...Service Space 58 Console Type 3 Service Space...

Page 53: ...Wiring Diagrams Console Type 59 4 Wiring Diagrams MFAU 12HRFN1 QRC8 MFA 16HRFN1 QRC8...

Page 54: ...Air Velocity and Temperature Distributions Reference Data 60 Console Type 5 Air Velocity and Temperature Distributions Reference Data Discharge angle 60 Airflow velocity Temperature...

Page 55: ...lectric Characteristics Console Type 61 6 Electric Characteristics Model Indoor Units Power Supply Hz Voltage Min Max MFA MFAU 12HRFN1 QRC8 50 220 240 198 254 16 MFA 16HRFN1 QRC8 50 220 240 198 254 16...

Page 56: ...Sound Levels 62 Console Type 7 Sound Levels 1 5m 1m Microphone Model Noise Power dB A Noise level dB A Higher H M L MFAU 12HRFN1 QRC8 57 47 44 40 37 MFA 16HRFN1 QRC8 59 48 47 44 40...

Page 57: ...Others Installation manual 1 Owner s manual 1 9 The Specification of Power MODEL 12000 Btu h 18000 Btu h Power Phase 1 phase 1 phase Frequency and Voltage 220 240V 50Hz 220 240V 50Hz Circuit Breaker F...

Page 58: ...Field Wiring 64 Console Type 10 Field Wiring MFAU 12HRFN1 QRC8 MFA 16HRFN1 QRC8...

Page 59: ...Outdoor Units Outdoor Units 65 Part 3 Outdoor Units 1 Dimensions 66 2 Service Space 68 3 Piping Diagrams 69 4 Wiring Diagrams 70 5 Electric Characteristics 74 6 Operation Limits 75 7 Sound Levels 76...

Page 60: ...1 Dimensions Model Unit mm A B C D E F H U2MRS 12 760 530 290 315 270 285 590 U2MRS 18 845 560 335 360 312 320 700 U2MRS 24 900 590 333 355 302 315 860 U2MRS 30 900 590 333 355 302 315 860 U2MRS 36 9...

Page 61: ...Dimensions Outdoor Units 67 Model Unit mm A B C D E F H MOU 36HFN1 QRC8 5A0 938 633 5 404 448 370 392 1369 MOU 36HFN1 RRC8 5A0 938 633 5 404 448 370 392 1369...

Page 62: ...Service Space 68 Outdoor Units 2 Service Space More than 60cm More than 30cm More than 60cm More than 200cm Air inlet Air inlet More than 30cm Air outlet Wall or obstacle Maintain channel...

Page 63: ...re switch INDOOR OUTDOOR T2 Evaporator temp sensor middle Accumulator Electronic expansion valve CAPILIARY TUBE 36K LIQUID SIDE GAS SIDE HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER Compressor 2 W...

Page 64: ...Wiring Diagrams 70 Outdoor Units 4 Wiring Diagrams U2MRS 12...

Page 65: ...Wiring Diagrams Outdoor Units 71 18K 24K 30K 36K...

Page 66: ...Wiring Diagrams 72 Outdoor Units...

Page 67: ...Wiring Diagrams Outdoor Units 73...

Page 68: ...istics 74 Outdoor Units 5 Electric Characteristics Model Outdoor Unit Hz Voltage Min Max 12K 50 220 240V 198V 254V 18K 50 220 240V 198V 254V 24K 50 220 240V 198V 254V 30K 50 220 240V 198V 254V 36K 50...

Page 69: ...ety protection features may come into operation and cause the unit to operate abnormally 2 The room relative humidity should be less than 80 If the air conditioner operates beyond this figure the surf...

Page 70: ...Sound Levels 76 Outdoor Units 7 Sound Levels H 1 0m Outdoor Unit Microphone Note H 0 5 height of outdoor unit Model Noise Power dB A Noise level dB A 12K 61 58 18K 65 61 24K 67 64 30K 70 61 36K 69 65...

Page 71: ...unit installation 80 4 Outdoor unit installation Side Discharge Unit 94 5 Refrigerant pipe installation 95 6 Drainage pipe installation 99 7 Vacuum Drying and Leakage Checking 103 8 Additional refrige...

Page 72: ...Wiring connection and electric safety checking Test operation Refrigerant pipe installation and insulation Drainage pipe installation and insulation Indoor unit installation location selection Outdoor...

Page 73: ...n The place shall easily support the outdoor unit s weight Locate the outdoor unit as close to indoor unit as possible The piping length and height drop can not exceed the allowable value The place wh...

Page 74: ...ation 3 1 1 Service space for indoor unit Model A H Remark 18 30 205 235 R410A and R22 Cooling Cooling Heating 36 245 275 R410A and R22 Cooling Cooling Heating 3 1 2 Bolt pitch 3 1 3 Install the penda...

Page 75: ...uts on the four installation hooks evenly to ensure the balance of the body Use a leveling instrument to make sure the levelness of the main body is within 1 Adjust the position to ensure the gaps bet...

Page 76: ...ion 3 1 5 Install the panel Remove the grille Remove the 4 corner covers Hang the panel to the hooks on the mainbody If the panel is with auto lift grille please watch the ropes lifing the grille DO N...

Page 77: ...ck on the ceiling to avoid condensate water Hang the air in grill to the panel then connect the lead terminator of the swing motor and that of the control box with corresponding terminators on the bod...

Page 78: ...Btu Size of outline dimension mounted plug L M 12 740 350 18 24 960 350 30 36 1180 490 3 2 3 Install the pendant bolt Select the position of installation hooks according to the hook holes positions sh...

Page 79: ...hexangular nuts on the four installation hooks evenly to ensure the balance of the body Use a leveling instrument to make sure the levelness of the main body is within 1 3 2 5 Install the air filter I...

Page 80: ...hed seal sponge as per the indicating place in the following fig and then change the mounting positions of air return panel and air return flange When install the filter mesh please plug it into flang...

Page 81: ...lation 87 3 3Ceiling floor indoor unit installation 3 3 1 Service space for indoor unit 3 3 2 Bolt pitch Ceiling installation Capacity Btu h D E 18K 24K 983 220 36K 1200 220 Wall mounted installation...

Page 82: ...at the selected positions on the ceiling Then embed the expansible hooks fittings Wall mounted installation Install the tapping screws onto the wall Refer to picture below 3 3 4 Install the main body...

Page 83: ...Put the side panels and grilles back Wall mounted installation Hang the indoor unit by insert the tapping screws into the hanging arms on the main unit The bottom of body can touch with floor or suspe...

Page 84: ...ce space for indoor unit 3 4 2 Bolt pitch 3 4 3 Install the pendant bolt Select the position of installation hooks according to the hook holes positions showed in upper picture Drill four holes of 12m...

Page 85: ...gh the 4 hanger of the main body to suspend it Adjust the hexangular nuts on the four installation hooks evenly to ensure the balance of the body Use a leveling instrument to make sure the levelness o...

Page 86: ...panel hooks till the panel closely stick on the ceiling to avoid condensate water Hang the air in grill to the panel then connect the lead terminator of the swing motor and that of the control box wit...

Page 87: ...door unit installation 3 5 1 Service space for indoor unit 3 5 2 Install the main body Fix the hook with tapping screw onto the wall Hang the indoor unit on the hook The bottom of body can touch with...

Page 88: ...60 24K 30K 590 333 355 36K 624 366 396 4 3 Install the Unit Since the gravity center of the unit is not at its physical center so please be careful when lifting it with a sling Never hold the inlet of...

Page 89: ...h 30m 20m 24 000Btu h 30 000Btu h 50m 25m 36 000Btu h 60 000Btu h 65m 30m 5 2 The procedure of connecting pipes 5 2 1 Choose the pipe size according to the specification table 5 2 2 Confirm the cross...

Page 90: ...pipe and fix it by supporter For horizontal refrigerant pipe the distance between supporters should not be exceed 1m For vertical refrigerant pipe the distance between supporters should not be exceed...

Page 91: ...18K 18K 30m L L1 L2 24K 24K 50m 30K 30K 50m Max branch pipe length 15m L1 L2 Max branch pipe length difference 10m L1 L2 Drop Height Max height difference between indoor unit and outdoor unit 20m H1 M...

Page 92: ...Refrigerant pipe installation 98 Installation...

Page 93: ...er flowrate is decided by the capacity of indoor unit Relationship between water flowrate and capacity of indoor unit Capacity x1000Btu Water flowrate l h 12 2 4 18 4 24 6 30 7 36 8 42 10 48 12 60 14...

Page 94: ...ng distance Gas bag 6 2 5 The horizontal pipe layout should avoid converse flow or bad flow Drainage pipe Water flow Drainage pipe Drainage pipe Drain tee Drain tee Water flow Water flow Water flow Wa...

Page 95: ...h Refer the following picture for installation reference Flexible pipe 300mm Hanger A A Length of horizontal pipe 150mm B Lift height the pump head of water pump Down incline pipe B 6 2 8 Blowhole set...

Page 96: ...at drainage outlet In light of the length of drainage pipe water shall be discharged about 1 minute delayed 2 3 Stop the operation of air conditioner power off the power supply and put the cover of wa...

Page 97: ...Hg after 1 5 hours of drying check whether there is leakage source 4 Leakage test After the vacuum degree reaches 755mmHg stop vacuum drying and keep the pressure for 1 hour If the indicator of vacuum...

Page 98: ...id pipe m Note Refrigerant may only be charged after performed the vacuum drying process Always use gloves and glasses to protect your hands and eyes during the charge work Use electronic scale or flu...

Page 99: ...environment place the layer of insulation should be thicker accordingly 9 1 4 Installation highlights of insulation construction Gas pipe and liquid pipe shall be insulated separately if the gas pipe...

Page 100: ...eld wiring construction should be finished by qualified electrician Air conditioning equipment should be grounded according to the local electrical regulations Current leakage protection switch should...

Page 101: ...units The gas side and liquid side stop values are both opened The air conditioner is pre heated by turning on the power 11 3 Test operation Set the air conditioner under the mode of COOLING by remote...

Page 102: ...Electrical Control System 108 Electrical Control System Part 5 Electrical Control System 1 Electrical Control Function 109 2 Troubleshooting 123 3 Controller 157...

Page 103: ...ssor stops and restarts up till T5 90 110 T5 115 decrease the frequency to the lower level every 2 minutes 105 T5 110 keep running at the current frequency T5 105 no limit for frequency For other unit...

Page 104: ...t to high med low auto 4 The louver operates same as in cooling mode 5 Auto fan For Console a b c d 5 0 4 0 2 5 1 0 6 0 T 1 2 4 e H H L 0 7 5 L H L 0 5 L H L 0 2 5 L L For Compact cassette 12K A5 12K...

Page 105: ...E DC_FAN_SSLOW_SPD_ADD 23 22 20 28 19 17 26 25 1 3 2 3 Indoor fan running rules For Console 12K In cooling mode indoor fan runs all the time and the speed can be selected as high medium low auto and s...

Page 106: ...4 T2 7 the compressor will keep the current frequency T2 7 the compressor frequency will not be limited For other units When T2 2 and lasts for 3 minutes the indoor has no capacity demand and resume...

Page 107: ...PD_ADD D DC_FAN_SLOW_SPD_ADD C DC_FAN_MIN_SPD_ADD B DC_FAN_MID_SPD_ADD A DC_FAN_HI_SPD_ADD 21 19 18 16 15 13 12 10 1 3 3 3 Indoor fan running rules For Console 12K In heating mode indoor fan can be se...

Page 108: ...2K When the compressor is on the indoor fan can be set to high medium low auto and silent And the anti cold wind function has the priority Auto fan action 3 5 T1 Ts T 4 High Low 5 Medium 4 5 For other...

Page 109: ...minutes and T3 TCDI2 T3 T30SUBT3TWO T30 3 If the compressor cumulate running time is up to 29 minutes and T3 TCDI3 for 3 minutes 4 If the compressor cumulate running time is up to 120 minutes and T3...

Page 110: ...pQuitDefrost_ADD The defrosting time achieves 10min Defrosting action 4 Way valve Indoor fan Outdoor fan 480P PMV PMV running 8 mins with 300P Compressor 10S 30S TimeA 10S no longer than 10min The oth...

Page 111: ...nutes 2 Running in cooling mode 3 Compressor is off for 1 hour Condition of entry defrosting time1 time2 40 minutes When defrosting is end time1 and time2 are cleared Condition of ending defrosting If...

Page 112: ...ontroller and the setting temperature can be changed between 17 30 In auto mode the machine will choose cooling heating or fan only mode according to T T T1 Ts For 12K units T T1 Ts Running mode T 1 C...

Page 113: ...hange the AC current operation mode Suppose AC is off now it will not start up firstly after setting the timer off function And when reaching the setting time the timer LED will be off and the AC runn...

Page 114: ...e from follow me signal every 3 minutes 3 The PCB will take action to the mode change information from remote controller signal and the follow me function will be turned off if the wired remote contro...

Page 115: ...6 it means the compressor discharge temp is 116 degree 10 AD value of current The display value is hex number 11 AD value of voltage 12 Indoor unit running mode code Off 0 Fan only 1 Cooling 2 Heating...

Page 116: ...cooling T2B 22 1 Indoor unit capacity demand code Actual data HP 10 If capacity demand code is higher than 99 the digital display tube will show single digit and tens digit For example the digital di...

Page 117: ...lanation on indoor display board A5 Duct OPERATION TIMER DEF FAN ALARM Temporary button Operation lamp Timer indicator Infrared signal receiver Alarm indicator PRE DEF indicator cooling and heating ty...

Page 118: ...Troubleshooting 124 Electrical Control System 2 1 5 Icon explanation on indoor display board Compact cassette 2 1 6 Icon explanation on indoor display board Console...

Page 119: ...function Running lamp Timer lamp Defrosting lamp 1 Indoor EEPROM malfunction 2 Indoor fan Speed has been out of control X 3 Open or short circuit of T1 or T2 temperature sensor X 4 Indoor outdoor unit...

Page 120: ...T2B temperature sensor X X X E4 5 Indoor EEPROM malfunction X X X E7 6 Indoor fan speed is out of control X X E8 7 Refrigerant Leakage Detection O X EC 8 Outdoor unit malfunction X X X Ed 9 Full water...

Page 121: ...E6 PFC module protection For MOU 36HFN1 QRC4 MOU 36HFN1 QRC8 E8 Outdoor fan speed is out of control P0 Top temperature protection of compressor P1 High pressure protection For 36k models P2 Low pressu...

Page 122: ...indoor unit 2 4 1 1 Open or short circuit of temperature sensor Check the connections between temperature sensor and PCB Are the connections good Correct the connections No Yes Yes Replace indoor or o...

Page 123: ...Troubleshooting Electrical Control System 129 2 4 1 2 Outdoor unit malfunction...

Page 124: ...M chip is welded on PCB replace the PCB directly Otherwise check whether the EEPROM chip plugged in PCB well Yes No Yes Insert the EEPROM well Replace the indoor PCB Shut off the power supply and turn...

Page 125: ...speed has been out of control Index 1 1 Indoor DC fan motor control chip is inside fan motor Measure the resistance value of each winding by using the tester If any resistance value is zero the fan m...

Page 126: ...tdoor PCB NO 1 2 3 4 5 Color Orange Grey White Pink Black Signal Hu Hv Hw Vcc GND Color Red Blue Yellow Signal W V U 1 Release the UVW connector Measure the resistance of U V U W V W If the resistance...

Page 127: ...motor Power on and when the unit is in standby measure the voltage of pin1 pin3 pin4 pin3 in fan motor connector If the value of the voltage is not in the range showing in below table the PCB must ha...

Page 128: ...2 sensor Does the problem remain again No Is there any leakage Especially the connection parts such as the gas valve and the liquid valve No Shut off the power supply and turn it on 5 seconds later Is...

Page 129: ...Troubleshooting Electrical Control System 135 2 4 2 For the super slim cassette with up down panel 2 4 2 1 Communication error between indoor unit and up down panel 2 4 2 2 Up down panel is defective...

Page 130: ...Troubleshooting 136 Electrical Control System 2 4 2 3 Up down panel is not closed...

Page 131: ...5 duct 2 4 3 1 Communication malfunction between master unit and indoor unit 2 4 3 2 Other malfunction between master unit and indoor unit One indoor unit displays F4 which means another indoor unit i...

Page 132: ...Troubleshooting 138 Electrical Control System 2 4 4 For the outdoor unit 2 4 4 1 E0 malfunction...

Page 133: ...nce Increase the capacity of anti interference Yes Yes Replace the signal wire Yes Pull out and insert back No No Replace indoor PCB is the error distinguished Yes Replace the outdoor PCB No Check whe...

Page 134: ...Troubleshooting 140 Electrical Control System 2 4 4 3 E3 malfunction...

Page 135: ...Troubleshooting Electrical Control System 141 2 4 4 4 E4 malfunction...

Page 136: ...supply Check whether the voltage of IPM board P and N is normal DC277 356V for 18K 24K 30KBtu h DC277 410V for 36K 48KBtu h Replace bridge rectifiers and then check whether the system can run normally...

Page 137: ...36KBtu h Check the power supply Check whether the voltage range of P N on IPM module is normal DC 350 650V Replace bridge rectifiers and then check whether the system can run normally Replace IPM boa...

Page 138: ...Troubleshooting 144 Electrical Control System 2 4 4 7 E6 malfunction Only for MOU 36HFN1 QRC4 MOU 36HFN1 QRC8...

Page 139: ...ting Electrical Control System 145 2 4 4 8 E8 malfunction DC motor voltage input and output NO Color Signal Voltage 1 Red Vs Vm 140 380V 2 3 Black GND 0V 4 White Vcc 13 5 16 5V 5 Yellow Vsp 0 6 5V 6 B...

Page 140: ...rigerant circulation volume is normal Whether abnormality is the same after gas charging Yes No No Reconnect and retest No Check refrigerant system such as clogging of capillary etc No Whether the con...

Page 141: ...Troubleshooting Electrical Control System 147 2 4 4 9 P1 malfunction For 36k models...

Page 142: ...Troubleshooting 148 Electrical Control System 2 4 4 10 P2 malfunction For 36k models...

Page 143: ...Troubleshooting Electrical Control System 149 2 4 4 11 P3 malfunction...

Page 144: ...harge temp is more than 115 C Check whether the wiring connection is right between compressor discharge temp sensor and PCB according to wiring diagrams Method Check whether the resistance of compress...

Page 145: ...ge 1 Check whether the outdoor ambient temperature is higher than 50 No Judge 3 The refrigerant pipe is blocked Let the refrigerant out then use the high pressure nitrogen or refrigerant to blow pipe...

Page 146: ...System 2 4 4 14 P6 malfunction For single phase units At first test the resistance between every two ports of U V W of IPM and P N If any result of them is 0 or close to 0 the IPM is defective Otherw...

Page 147: ...e between main board and the IPM module is connected tightly Yes Connect it tightly check ok or not No No No Connect it well check ok or not Check whether the connecting line of the compressor is conn...

Page 148: ...and the indoor fan is running normal No Check refrigerant system such as clogging of capillary etc No Clean the heat exchanger and the air outlet Reconnect and retest No Whether the connection is goo...

Page 149: ...6 13059 76 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...

Page 150: ...489 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...

Page 151: ...ireless Remote Controller 3 1 1RG51Q1 BGE General Function for wireless remote controller Model RG51Q1 BGE Rated voltage 3 0V 2pieces of LR03 7 batteries Min voltage for sending signal of CPU 2 4V Eff...

Page 152: ...air conditioner 8 FAN SPEED Fan speed will be selected in following sequence once pressing this button AUTO LOW MED HIGH 9 TIME ON For time ON setting Once pressing this button the time will increase...

Page 153: ...on Fan speedse tting SWING AIR DIRECTION Res et 13 1 Adjust Decrease the set temp Keeping pressing will decrease the temp with 1 per 0 5s 2 Adjust Increase the set temp Keeping pressing will increase...

Page 154: ...ture and save energy This function is available on COOL HEAT or AUTO mode only NOTE While the unit is running under Energy saving mode it would be cancelled if press MODE FAN SPEED or ON OFF button 11...

Page 155: ...AIR DIRECTION POWERFUL 5 1 TEMP Button Press the button to decrease the indoor temperature setting 2 TEMP Button Press the button to increase the indoor temperature setting 3 ON OFF Button Push this b...

Page 156: ...se the time ON setting in 60 minutes increments To cancel the time ON program simply adjust the time ON to 0 00 10 ECONOMIC RUNNING Button Press this button to go into the energy Saving operation mode...

Page 157: ...el the TIMER ON then adjust the time of TIMER ON as 0 0 3 Timer off button Push the button to set TIMER OFF each time you push the button the time moves forward by o 5 hours When the set time is over...

Page 158: ...then the icon of LOCK disappears In the mode of LOCK all the buttons are invalid except for LOCK button 5 CLOCK display Usually display the clock set currently Press the button CLOCK for 4 seconds the...

Page 159: ...r Installation Installation Notice When the air conditioner needs the constant frequency wire Controller be sure adding a Wire Joint with 5 terminal named A B C D E in indoor unit and fixing a infrare...

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