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Mitsubishi Electric MXZ-8A140VA, Technical & Service Manual, Page: 2 / 86

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Mitsubishi Electric MXZ-8A140VA Technical & Service Manual Download Page 2

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TECHNICAL CHANGES

MXZ-8A140VA

2

➔

MXZ-8A140VA

3

The parts below have been changed.
• THERMISTOR (DISCHARGE/TH4) (Connector change)
• CONTROLLER CIRCUIT BOARD(C.B)
• NOISE FILTER CIRCUIT BOARD(N.F.)
• ACTIVE FILTER MODULE(ACTM)
• RELAY(52C), RESITOR(RS)(including N.F.)

MXZ-8A140VA

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➔

MXZ-8A140VA

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The parts below have been changed.
• FOUR-WAY VALVE AND COIL(21S4)
• CONTROLLER CIRCUIT BOARD(C.B.)
• FAN MOTOR(MF1, MF2)
• SOLENOID VALVE AND COIL(SV2)

MXZ-8A140VA

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MXZ-8A140VA

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The parts below have been changed.
• POWER CIRCUIT BOARD(P.B.)
• NOISE FILTER CIRCUIT BOARD(N.F.)
• THERMISTOR (OUTDOOR / TH7)

(Length change)

OC316D--1.qxp  07.8.24 2:10 PM  Page 2

Summary of Contents for MXZ-8A140VA

Page 1: ...ver OUTDOOR UNIT BRANCH BOX No OC316 REVISED EDITION D Model name Service Ref Outdoor unit MXZ 8A140VA MXZ 8A140VA MXZ 8A140VA1 MXZ 8A140VA2 MXZ 8A140VA3 Branch box PAC AK50BC PAC AK50BC PAC AK30BC PAC AK30BC Indispensable optional parts for MXZ 8A140VA Model name indication HFC utilized R410A Revision MXZ 8A140VA3 is added in REVISED EDITION D Some descriptions have been modified Please void OC31...

Page 2: ... N F ACTIVE FILTER MODULE ACTM RELAY 52C RESITOR RS including N F MXZ 8A140VA1 MXZ 8A140VA2 The parts below have been changed FOUR WAY VALVE AND COIL 21S4 CONTROLLER CIRCUIT BOARD C B FAN MOTOR MF1 MF2 SOLENOID VALVE AND COIL SV2 MXZ 8A140VA MXZ 8A140VA1 The parts below have been changed POWER CIRCUIT BOARD P B NOISE FILTER CIRCUIT BOARD N F THERMISTOR OUTDOOR TH7 Length change ...

Page 3: ...frigerant cycle and that can cause deterioration of refrigerant oil etc Use the following tools specifically designed for use with R410A refrigerant The following tools are necessary to use R410A refrigerant Keep the tools with care If dirt dust or moisture enters into refrigerant cycle that can cause deterioration of refrigerant oil or malfunction of com pressor Do not use a charging cylinder If ...

Page 4: ...e base 7 Refrigerant cylinder Only for R410A Top of cylinder Pink Cylinder with syphon 8 Refrigerant recovery equipment 2 Additional refrigerant charge When charging directly from cylinder Check that cylinder for R410A on the market is syphon type Charging should be performed with the cylinder of syphon stood vertically Refrigerant is charged from liquid phase 1 Cautions for service 1 Perform serv...

Page 5: ... 0 29 0 17 0 22 0 24 0 27 0 36 0 Nominal dimensions inch Flare nut dimensions Outside diameter Dimension B mm R410A R22 Gauge manifold Charge hose Gas leak detector Refrigerant recovery equipment Refrigerant cylinder Applied oil Safety charger Charge valve Vacuum pump Flare tool Bender Pipe cutter Welder and nitrogen gas cylinder Refrigerant charging scale Vacuum gauge or thermis tor vacuum gauge ...

Page 6: ...Z GA25 35 50 60 PEAD RP50 60 71EA UK PEAD RP60 71GA UK PEA RP71EA SLZ KA25 35 50 PLA RP35 50 60 71BA UK MFZ KA25 35 50 Floor standing Capacity class 2 2kW 2 5kW 3 5kW 5 0kW 6 0kW 7 1kW 8 0kW Connectable indoor unit lineup Heat pump inverter type NOTE The lineup of a connectable indoor unit depends on a district areas country Branch box PAC AK50BC 5 branches MAX 5 units PAC AK30BC 3 branches MAX 3 ...

Page 7: ...on signal of indoor units to achieve the optimum control 3 2 1 System example 3 2 2 Method for identifying Outdoor unit M X Z 8 A 140 V A Model type Power supply V Single phase 220 230 240V 50Hz 220V 60Hz Multi type heat pump inverter outdoor unit Indicates equivalent to rated cooling capacity O0 1kW Number of connectable indoor units MAX Control and refrigerant A New A control and R410A PAC AK 50...

Page 8: ... 5 0 71 7 1 60 6 0 80 8 0 System example of 5 indoor units Verification The rated capacity should be determined by observing the table below The unit s quantities are limited in 2 to 8 units For the next step make sure that the selected total rated capacity is in a range of 4 4 18 5kW The total indoor unit capacity should be within the outdoor units 14 0kW is preferred Combination of excessive ind...

Page 9: ...ring and pipe access to the power source and indoor unit Drain water must be drained freely during operation Check for draining 3 4 2 Ventilation and service space 1 Windy location installation When installing the outdoor unit on a rooftop or other location unprotected from the wind situate the air outlet of the unit so that it is not directly exposed to strong winds Strong wind entering the air o...

Page 10: ... Obstacles at rear and sides only Fig 2 6 Obstacles at front only Fig 2 7 w When using an optional air outlet guide the clearance is 500 mm or more Obstacles at front and rear only Fig 2 8 w When using an optional air outlet guide the clearance is 500 mm or more Obstacles at rear sides and above only Fig 2 9 Do not install the optional air outlet guides for upward airflow 150 300 1000 Max 500 150 ...

Page 11: ...ptional air outlet guide the clearance is 500 mm or more Single parallel unit arrangement Fig 2 14 w When using an optional air outlet guide installed for upward airflow the clearance is 1000 mm or more Multiple parallel unit arrangement Fig 2 15 w When using an optional air outlet guide installed for upward airflow the clearance is 1500 mm or more Stacked unit arrangement Fig 2 16 The units can b...

Page 12: ... coils sensors and drain pan is possible w3 B B is 600 In the case of 450 prepare a maintenance hole at a PCB side as it is shown in Fig 3 3 and Min 300 mm is needed as distance A In the case of less than 300 mm for example A is 100 mm the exchange work of Branch box linear expansion valve coils sensors and drain pan from a maintenance hole becomes difficult Only exchange work of a PCB is possible...

Page 13: ...onnection size of indoor unit use optional different diameter deformed joints to the branch box side Connect deformed joint directly to the branch box side A B Flare connection employed No brazing A B B B B B Branch box In case of using 1 branch box Flare connection employed No brazing A A A B B B B B 2 branches pipe joint optional parts Branch box 1 Branch box 2 In case of using 2 branch boxes In...

Page 14: ... series D B 32 C W B 23 C D B 21 C W B 15 C D B 27 C D B 20 C P series D B 35 C W B 22 5 C D B 19 C W B 15 C D B 28 C D B 17 C Outdoor D B 46 C D B 5 C D B 21 C W B 15 C D B 15 C W B 15 C Cooling Heating Service Ref 2 9 OUTDOOR UNIT REFRIGERANT PIPING MXZ 8A140VA MXZ 8A140VA1 MXZ 8A140VA2 MXZ 8A140VA3 Power supply phase cycle voltage Breaker Max current Outdoor unit only Conversion formula Convers...

Page 15: ...C D 12 7 o 1 E PAC AK50BC PAC AK30BC Single phase 220 230 240V 50Hz Single phase 220V 60Hz 0 003 0 05 Galvanized sheets O D 20 VP 16 450 280 198 9 52 15 88 Each 3 wire plus earth wire 3 wire plus earth wire W Branch box PAC AK50BC PAC AK30BC W The piping connection size differs according to the type and capacity of indoor units Match the piping connection size for indoor and branch box If the pipi...

Page 16: ...25 2200 2500 4700 1650 7 2 6 9 7 6 22 35 2200 3500 5700 1910 8 4 8 0 8 8 22 50 2200 5000 7200 2340 10 3 9 8 10 7 22 60 2200 6000 8200 2620 11 5 11 0 12 0 22 71 2200 7100 9300 2910 12 8 12 2 13 4 25 25 2500 2500 5000 1700 7 5 7 2 7 8 25 35 2500 3500 6000 2000 8 8 8 4 9 2 25 50 2500 5000 7500 2430 10 7 10 2 11 2 25 60 2500 6000 8500 2700 11 9 11 4 12 4 25 71 2500 7100 9600 2990 13 1 12 6 13 7 35 35 ...

Page 17: ... 0 25 35 35 2500 3500 3500 9500 2960 13 0 12 5 13 6 25 35 50 2500 3500 5000 11000 3560 15 6 15 0 16 3 25 35 60 2500 3500 6000 12000 4080 17 9 17 2 18 7 25 35 71 2500 3500 7100 13100 4720 20 7 19 9 21 7 25 50 50 2500 5000 5000 12500 4360 19 1 18 4 20 0 25 50 60 2500 5000 6000 13500 4970 21 8 20 9 22 8 25 50 71 2400 4790 6810 14000 5220 22 9 22 0 24 0 25 60 60 2410 5790 5790 14000 5220 22 9 22 0 24 ...

Page 18: ...090 14000 4500 19 8 18 9 20 7 22 35 50 50 1960 3120 4460 4460 14000 4810 21 1 20 2 22 1 22 35 50 60 1840 2930 4190 5030 14000 4310 18 9 18 1 19 8 22 35 50 71 1730 2750 3930 5580 14000 3860 17 0 16 2 17 7 22 35 60 60 1730 2770 4750 4750 14000 3900 17 1 16 4 17 9 22 50 50 50 1790 4070 4070 4070 14000 4090 18 0 17 2 18 8 22 50 50 60 1690 3850 3850 4610 14000 3730 16 4 15 7 17 1 25 25 25 25 2500 2500 ...

Page 19: ...5 25 25 35 2200 2500 2500 2500 3500 13200 4770 20 9 20 1 21 9 22 25 25 25 50 2100 2380 2380 2380 4760 14000 5220 22 9 22 0 24 0 22 25 25 25 60 1960 2230 2230 2230 5350 14000 4810 21 1 20 2 22 1 22 25 25 25 71 1830 2080 2080 2080 5920 14000 4260 18 7 17 9 19 6 22 25 25 35 35 2170 2460 2460 3450 3450 14000 5220 22 9 22 0 24 0 22 25 25 35 50 1960 2230 2230 3120 4460 14000 4810 21 1 20 2 22 1 22 25 25...

Page 20: ...14000 5220 22 9 22 0 24 0 22 22 25 25 25 35 2000 2000 2270 2270 2270 3180 14000 4980 21 9 21 0 22 9 22 22 25 25 25 50 1820 1820 2070 2070 2070 4140 14000 4220 18 5 17 8 19 4 22 22 25 25 25 60 1720 1720 1960 1960 1960 4680 14000 3830 16 8 16 1 17 6 22 22 25 25 35 35 1880 1880 2130 2130 2990 2990 14000 4450 19 5 18 7 20 4 22 22 25 25 35 50 1720 1720 1960 1960 2740 3900 14000 3830 16 8 16 1 17 6 22 2...

Page 21: ...0 2070 2070 2070 14000 4220 18 5 17 8 19 4 22 22 25 25 25 25 35 1710 1710 1960 1960 1960 1960 2740 14000 3830 16 8 16 1 17 6 22 25 25 25 25 25 25 1790 2030 2030 2030 2030 2030 2030 14000 4090 18 0 17 2 18 8 22 25 25 25 25 25 35 1690 1920 1920 1920 1920 1920 2690 14000 3730 16 4 15 7 17 1 25 25 25 25 25 25 25 2000 2000 2000 2000 2000 2000 2000 14000 3980 17 5 16 8 18 3 25 25 25 25 25 25 35 1890 189...

Page 22: ... 15 3 22 71 2510 8090 10600 3810 16 7 16 0 17 5 25 25 2850 2850 5700 1960 8 6 8 2 9 0 25 35 2880 4020 6900 2400 10 5 10 1 11 0 25 50 2870 5730 8600 3030 13 3 12 8 13 9 25 60 2850 6850 9700 3450 15 2 14 5 15 8 25 71 2860 8140 11000 3960 17 4 16 7 18 2 35 35 4000 4000 8000 2810 12 3 11 8 12 9 35 50 3990 5710 9700 3450 15 2 14 5 15 8 35 60 4020 6880 10900 3920 17 2 16 5 18 0 35 71 4000 8100 12100 435...

Page 23: ...15 8 25 25 50 2850 2850 5700 11400 4120 18 1 17 3 18 9 25 25 60 2860 2860 6870 12600 4510 19 8 19 0 20 7 25 25 71 2850 2850 8100 13800 4880 21 4 20 5 22 4 25 35 35 2860 4020 4020 10900 3920 17 2 16 5 18 0 25 35 50 2860 4010 5730 12600 4510 19 8 19 0 20 7 25 35 60 2850 4000 6850 13700 4850 21 3 20 4 22 3 25 35 71 2860 4010 8130 15000 5260 23 1 22 1 24 2 25 50 50 2860 5720 5720 14300 5040 22 1 21 2 ...

Page 24: ...5100 22 4 21 5 23 4 22 35 35 50 2480 3940 3940 5630 16000 5430 23 8 22 9 24 9 22 35 35 60 2320 3680 3680 6320 16000 4920 21 6 20 7 22 6 22 35 35 71 2160 3440 3440 6960 16000 4460 19 6 18 8 20 5 22 35 50 50 2230 3570 5100 5100 16000 4700 20 6 19 8 21 6 22 35 50 60 2110 3350 4790 5750 16000 4320 19 0 18 2 19 8 22 35 50 71 1980 3150 4490 6380 16000 3960 17 4 16 7 18 2 22 35 60 60 1990 3160 5420 5420 ...

Page 25: ...030 3030 6140 16000 3760 16 5 15 8 17 3 22 22 35 50 50 1970 1970 3120 4470 4470 16000 3930 17 3 16 5 18 0 22 25 25 25 25 2500 2850 2850 2850 2850 13900 4910 21 6 20 7 22 5 22 25 25 25 35 2520 2860 2860 2860 4000 15100 5290 23 2 22 3 24 3 22 25 25 25 50 2390 2720 2720 2720 5440 16000 5160 22 7 21 7 23 7 22 25 25 25 60 2240 2550 2550 2550 6110 16000 4700 20 6 19 8 21 6 22 25 25 25 71 2100 2380 2380 ...

Page 26: ...22 25 35 50 2000 2000 2000 2270 3180 4550 16000 4020 17 7 16 9 18 5 22 22 22 35 35 35 2060 2060 2060 3270 3270 3270 16000 4180 18 4 17 6 19 2 22 22 25 25 25 25 2440 2440 2780 2780 2780 2780 16000 5320 23 4 22 4 24 4 22 22 25 25 25 35 2280 2280 2600 2600 2600 3640 16000 4830 21 2 20 3 22 2 22 22 25 25 25 50 2080 2080 2370 2370 2370 4730 16000 4250 18 7 17 9 19 5 22 22 25 25 25 60 1970 1970 2230 223...

Page 27: ... 22 22 22 25 25 25 25 2120 2120 2120 2410 2410 2410 2410 16000 4350 19 1 18 3 20 0 22 22 22 25 25 25 35 2000 2000 2000 2270 2270 2270 3180 16000 4020 17 7 16 9 18 5 22 22 25 25 25 25 25 2070 2070 2370 2370 2370 2370 2370 16000 4250 18 7 17 9 19 5 22 22 25 25 25 25 35 1970 1970 2230 2230 2230 2230 3130 16000 3930 17 3 16 5 18 0 22 25 25 25 25 25 25 2050 2320 2320 2320 2320 2320 2320 16000 4150 18 2...

Page 28: ...capacity at the rated time Individual capacity at the rated time Individual capacity under stated conditions Total capacity under the stated conditions o Total capacity at the rated time Rated cooling capacity Rated heating capacity Indoor D B 27 C W B 19 C Outdoor D B 35 C Indoor D B 20 C Outdoor D B 7 C W B 6 C 5 0 5 10 15 20 25 30 35 40 46 16 18 20 22 0 6 0 8 1 1 2 1 4 Cooling capacity ratio Ou...

Page 29: ...tual capacity 1 Capacity correction factor 2 Method for Obtaining the Corrected Piping Length Corrected piping length Actual piping length between outdoor unit and the farthest indoor unit 0 30 o number of bends in the piping m Fig 3 Cooling capacity correction curve 2 2 15 7 7 0 50 10 5 75 14 0 100 18 5 132 0 65 20 40 60 80 20 40 60 80 0 70 0 75 0 80 0 85 0 90 0 95 1 00 Cooling Capacity ratio Tot...

Page 30: ... 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 µbar BAND CENTER FREQUENCIES Hz NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 MXZ 8A140VA MXZ 8A140VA1 MXZ 8A140VA2 MXZ 8A140VA3 COOLING MODE HEATING 50 SPL dB 52 LINE ...

Page 31: ...tion M10 bolts Bolts and washers must be purchased locally Foundation bolt height Dimensions of space needed for service access are shown in the below diagram The diagram below shows a basic example Explanation of particular details are given in the installation manuals etc FREE Over 10mm Over 10mm Over 150mm Over 1000mm 30 FOUNDATION 10 500 500 150 Service space Piping Knockout Hole Details 63 73...

Page 32: ...ust be purchased locally Foundation bolt height Dimensions of space needed for service access are shown in the below diagram The diagram below shows a basic example Explanation of particular details are given in the installation manuals etc FREE Over 10mm Over 10mm Over 150mm Over 1000mm 30 FOUNDATION 10 500 500 150 Service space Piping Knockout Hole Details 63 73 23 55 27 92 65 40 45 Power supply...

Page 33: ...55 198 65 39 25 25 25 25 25 21 75 75 75 75 E D C B A E D C B A 91 73 200 23 20 DRAIN PIPE CONNECTION VP 16 FLEXIBLE DRAIN HOSE ACCESSORY 450 SUSPENSION BOLT W3 8 M10 REFRIGERANT PIPE FLARED CONNECTION inch DRAIN HOSE SIZE O D 20 VP 16 LIQUID PIPE GAS PIPE A B C TO OUTDOOR UNIT 1 4 1 4 1 4 3 8 5 8 3 8 3 8 3 8 3 ELECTRIC WIRE INLET 3 WIRE BAND ELECTRIC COVER TO OUTDOOR UNIT SERVICE PANEL for LEV THE...

Page 34: ...1 SV2 CN3S CNDM CN51 CNIT Switch Model Select Switch Function Setup Switch Switch Function for option Switch Function for option Connector Light Emitting Diodes Operation Inspection Indicators Connector Connector Connector Connector Connector Connector Connection for Option Connector Connector Connector Connection for Option Connector Connected for Option Contact Input Connector Connection for Opt...

Page 35: ...ector Connector Connector Connector Connector Connector Connection for Option Connector Connector Connector Connection for Option Connector Connected for Option Contact Input Connector Connection for Option Connector Connection for Option N F C B Power turned on Details WARNING When the main supply is turned off the voltage 340 V in the main capacitor will drop to 20 V in approx 2 minutes input vo...

Page 36: ...ion valve in branch box SYMBOL SYMBOL SYMBOL NAME NAME NAME TB1 MC MF1 MF2 21S4 SV1 SV2 63HS 63L TH3 TH4 TH6 TH7 TH8 DCL 52C ACTM CB P B 63H Terminal Block Power Supply Branch Box Motor for Compressor Fan Motors Solenoid Valve Four Way Valve Solenoid Valve Bypass Valve High Pressure Sensor High Pressure Switch Low Pressure Switch Thermistor Outdoor Pipe Thermistor Discharge Thermistor Outdoor 2 Ph...

Page 37: ... S3 TB3B S1 S2 S3 TB3A S1 S2 S3 TB2B S1 S2 S3 Note PAC AK30 50BC is only for R410A Note 1 At servicing for outdoor unit always follow the wiring diagram of Outdoor unit 2 Symbols used in wiring diagram above are terminal block connector Combination of indoor units Fill out the location of combined indoor units with model name in each blank below because it is necessary for service and maintenance ...

Page 38: ... Ball valve Stop valve Bypass valve SV2 Bypass valve SV1 High pressure sensor discharge pressure sensor 63HS Accumulator 4 way valve Distributor with Strainer Refrigerant flow in cooling Refrigerant flow in heating Outdoor unit MXZ 8A140VA MXZ 8A140VA1 MXZ 8A140VA2 MXZ 8A140VA3 PAC AK50BC PAC AK30BC Branch box Capillary tube 1 For return of oil from oil separator Capillary tube 2 For SV2 Capillary...

Page 39: ... Gas pipe Liquid pipe Gas pipe Liquid pipe Gas pipe Liquid pipe Gas pipe 6 35 mm 9 52 mm 6 35 mm 9 52 mm 6 35 mm 9 52 mm 6 35 mm 9 52 mm 6 35 mm 12 7 mm w 3 branch type is only for A B and C unit w w w 6 35mm 9 52mm 12 7mm 15 88mm 19 05mm Conversion formula 1 4 inch 3 8 inch 1 2 inch 5 8 inch 3 4 inch 1 Valve size for outdoor unit 2 Valve size for branch unit Different diameter joint optional part...

Page 40: ...o 9 4 TROUBLESHOOTING BY INFERIOR PHENOMENA The trouble is not reoccurring Logged Not logged 1Consider the temporary defects such as the work of protection devices in the refrigerant circuit including compressor poor connection of wiring noise and etc Re check the symptom and check the installation environment refrigerant amount weather when the trouble occurred matters related to wiring and etc 2...

Page 41: ... of refrigerant in the compressor The resistance will rise above 1M after the compressor is warmed up for 4 hours The time necessary to warm up the compressor varies according to atmospheric conditions and refrigerant accumulation To operate the compressor with refrigerant accumulated in the compressor the compressor must be warmed up at least 12 hours to prevent breakdown 4 If the insulation resi...

Page 42: ...se of the test run from outdoor unit all indoor units operate Therefore you cannot detect any erroneous con nection of refrigerant pipes and the connecting wires If it aims at detection of any erroneous connection be sure to carry out the test run from remote controller with reference to 1 Using remote controller SW4 1 SW4 2 SW4 1 SW4 2 ON OFF ON ON Cooling operation Heating operation w After perf...

Page 43: ...the units cannot be repaired F3 5202 63L connector open Abnormal if 63L connector circuit is open for 3 minutes continuously after power sup ply 63L Low pressure switch 1 Disconnection or contact failure of 63L connector on outdoor controller circuit board 2 Disconnection or contact failure of 63L 3 63L is working due to refriger ant leakage or defective parts 4 Defective outdoor controller circui...

Page 44: ...or branch box controller circuit board can automatically check the num ber of connected indoor units Abnormal if the number cannot be checked auto matically due to miswiring of indoor branch box branch box outdoor unit connecting wire and etc after power is turned on for 4 minutes 1 Check disconnection or looseness or polarity of indoor branch box branch box outdoor unit connecting wire of indoor ...

Page 45: ...ndoor unit 2 Clogged filter of indoor unit 3 Decreased airflow caused by dirt of indoor fan 4 Dirt of indoor heat exchanger 5 Locked indoor fan motor 6 Malfunction of indoor fan motor 7 Defective operation of stop valve Not fully opened 8 Clogged or broken pipe 9 Locked outdoor fan motor 10 Malfunction of outdoor fan motor 11 Short cycle of outdoor unit 12 Dirt of outdoor heat exchang er 13 Decrea...

Page 46: ...ge temperature ther mistor defective 3 Thermistor input circuit defective and high pressure pressure sensor defective in multi controller board 5 Error detection of TH7 TH3 1 Thermistor defective 2 Thermistor input circuit defective in multi controller board 1 Check intake superheat Check leakage of refrigerant Charge additional refrigerant 2 Check if stop valve is fully open 34 Turn the power off...

Page 47: ...flow path for cooling 4 Check if there is something which causes temperature rise around outdoor unit Upper limit of ambient temperature is 46 Turn off power and on again to check if U5 is displayed within 30 minutes If U4 is displayed instead of U5 follow the action to be taken for U4 5 Check resistance value of thermistor TH8 or temperature by microcomputer Thermistor TH8 Refer to 9 6 SW2 on A C...

Page 48: ...tdoor power circuit board 6 Check CNAF wiring 7 Replace outdoor controller circuit board 220 240VAC output VA VA1 VA2 12V DC output VA3 8 Check CN5 wiring on the outdoor power circuit board Refer to 9 7 9 Check CN2 wiring on the outdoor power circuit board Refer to 9 7 U7 1520 1 Too low superheat due to low dis charge temperature Abnormal if discharge superheat is contin uously detected 15 or lss ...

Page 49: ...oor or branch box or outdoor units 2 4 Turn the power off and on again to check Replace indoor controller board or branch controller board or outdoor con troller circuit board if abnormality is dis played again UL 1300 Low pressure 63L worked Abnormal if 63L is worked under 0 03MPa during compressor operation 63L Low pressure switch 1 Stop valve of outdoor unit is closed during operation 2 Disconn...

Page 50: ...ontroller circuit board and the outdoor power circuit board 3 Defective communication circuit of outdoor power circuit board 4 Defective communication circuit of outdoor controller circuit board for outdoor power circuit board 12 Check connection of each connector CN2 and CN4 between the outdoor controller circuit board and the outdoor power circuit board 3 Replace outdoor power circuit board 4 Re...

Page 51: ...heat exchanger 6 Remove the shield 7 Check refrigerant system during opera tion 3 1For 3 minutes after temperature adjuster turns off the compressor will not start operating even if tem perature adjuster is turned on 2For 3 minutes after temperature adjuster turns on the compressor will not stop operating even if tem perature adjuster is turned off Compressor stops operating immediately when turni...

Page 52: ...switching SW7 1 on the control circuit board for the outdoor unit the following power consumption restrictions compared to rated power can be set CN51 X 5 4 3 A C D 5 E 1 1 3 B G Y L1 Error display lamp L2 Compressor operation lamp X Y Relay Coil standard of 0 9W or less for DC 12V F A C D E B G F CN3S X Y SW1 SW2 1 2 3 X Y Relay DC1mA SW1 SW2 ON Heating Validity of SW1 OFF Cooling Invalidity of S...

Page 53: ...ture 20 Solenoid valve coil Four way valve 21S4 Motor for compressor MC Normal Abnormal Open or short Measure the resistance between the terminals with a tester At the ambient temperature 20 Normal 1197 10 Abnormal Open or short Solenoid valve coil Bypass valve SV2 Measure the resistance between the terminals with a tester At the ambient temperature 20 Normal 1327 10 Abnormal Open or short Solenoi...

Page 54: ...tor CNF1 2 Fuse check Check the fuse F5 on outdoor controller board Power supply check Remove the connector CNF1 2 Measure the voltage in the outdoor controller circuit board TEST POINT 1 VDC between 1 and 4 of the fan connector VDC DC250 330V TEST POINT 2 VCC between 5 and 4 of the fan connector VCC DC15V Wiring recovery Replace outdoor controller board Replace the fan motor Replace outdoor contr...

Page 55: ...0 0 10 20 30 40 50 Temperature Resistance k 0 180k 25 50k 50 17k 70 8k 90 4k Thermistor R50 17k 2 B constant 4170 3 Rt 17exp 4170 273 t 323 1 1 Thermistor R120 7 465k 2 B constant 4057 2 Rt 7 465exp 4057 273 t 393 1 1 Medium temperature thermistor Heatsink temperature thermistor TH8 20 250k 30 160k 40 104k 50 70k 60 48k 70 34k 80 24k 90 17 5k 100 13 0k 110 9 8k High temperature thermistor Discharg...

Page 56: ...n measure the resistance with a tester At the ambient temperature 10 30 Disconnect the connector then measure the resistance with a tester Winding temperature 20 Thermistor TH A E Gas pipe Normal 4 3k 9 6k Abnormal Open or short Normal Red White Red Orange Brown Yellow Brown Blue Abnormal 46 4 Linear expansion valve LEV A E Open or short ...

Page 57: ...be heard No sound is heard when the pulse number moves from B to A in case coil is burnt out or motor is locked by open phase Sound can be detected by placing the ear against the screw driver handle while putting the screw driver to the linear expansion valve LEV M 1 6 4 4 3 2 1 2 1 Red Brown Blue Orange Yellow White 3 4 5 6 Connector LEV A LEV B LEV C LEV D LEV E DC12V branch box controller board...

Page 58: ...ly Otherwise pipes can bend due to pressure How to attach the coil Hold the lower part of the main body shown as A firmly so that the main body does not move and attach the coil by inserting it downward into the main body Then securely attach the coil stop per to pipe B At this time be careful that stress is not added to lead wire and main body is not wounded by lead wire If the stopper is not fir...

Page 59: ...should be fully closed when the fan is operating The temperature measured by the temperature sensor will drop if there is any leakage If the measured temperature is significantly lower than that on the remote controller this indicates that the valve is not closed It is not necessary to replace the linear expansion valve if the leak of refrigerant is small and does not cause a malfunction 1 Check i...

Page 60: ...essure switch SV2 Solenoid valve2 CN4 Transmission to outdoor power circuit board CN4 LED3 SW10 SW2 SW4 Test operation SW6 Model setup SW5 Function switch SW1 Forced defrost detect history record reset CNDM 1 to 2 Input of low noise mode 1 to 3 Input of external contact point TH4 Thermistor Discharge TH3 Thermistor Outdoor pipe TH7 Thermistor Outdoor TH6 Thermistor Outdoor 2 phase pipe CNDC DC280V...

Page 61: ...reset CNDM 1 to 2 Input of low noise mode 1 to 3 Input of external con tact point TH4 Thermistor Discharge TH3 Thermistor Outdoor pipe TH7 6 Thermistor Outdoor 2 phase pipe CNDC 280V DC 1 3 Connect to outdoor power circuit board CNDC VFG TEST POINT 4 Voltage between right pins of PC5C and PC5D pin 3 and pin 4 Same as CNF17 4 VSP TEST POINT 3 Voltage between pins of C5A C5B DC 0V when stopped DC 1 ...

Page 62: ...e outdoor controller circuit board CNAC EI Connect to the earth LI NI Voltage of 220 240V AC is input Connect to the terminal block TB1 CN5 Primary current Connect to the outdoor power circuit board CN5 LO NO Voltage of 220 240V AC is output Connect to the outdoor power circuit board SC R SC S ...

Page 63: ...o the outdoor controller circuit board CNAC EI Connect to the earth LI NI Voltage of 220 240V AC is input Connect to the terminal block TB1 CN5 Primary current Connect to the outdoor power circuit board CN5 LO NO Voltage of 220 240V AC is output Connect to the outdoor power circuit board TABS TABT ...

Page 64: ...or power circuit board CN5 LO NO Voltage of 220 240V AC is output Connect to the outdoor power circuit board TABS TABT Outdoor noise filter circuit board MXZ 8A140VA3 CN52C 52C driving signal Connect to the outdoor controller circuit board CN52C E2 Connect to the earth LI NI Voltage of 220 240V AC is input Connect to the terminal block TB1 RS1 ...

Page 65: ...L N N1 N2 P1 P2 U V and W shown in the diagram are not actually printed on the board POWER MODULE CNDC 280V 350V DC Connect to the outdoor controller circuit board CNDC P1 P2 N1 L N N2 U V W CN5 Detection of primary current Connect to the outdoor noise filter circuit board CN5 CN3 Temperature Heatsink TH8 CN4 Connect to the outdoor controller circuit board CN4 TAB U TAB V TAB W Connect to the comp...

Page 66: ... TABU V W Connect to the compressor MC Voltage among phases 10V 180V AC TABP1 SC P1 Connect to 52C TABP2 SC P2 Connect to the ACTM P CN4 Connect to the outdoor controller circuit board CN4 CN2 Connect to the outdoor controller circuit board CN2 1 5 Transmitting signal to the outdoor controller circuit board 0 5V DC 2 5 Zero cross signal 0 5V DC 3 4 18V DC 6 5 16V DC 7 5 16V DC CN3 Thermistor TH8 H...

Page 67: ...anch box Indoor unit connecting wire TB3A to TB3C for PAC AK30BC LED1 Transmission start up state display Start up LED1 blinks 0 5sec ON 0 5sec OFF Start up completion LED1 lights LED3 5 Not used LED2 Transmission Branch box outdoor Reception state disply on branch box side Branch box No 1 LED2 blinks once 0 1sec ON 0 9sec OFF Branch box No 2 LED2 blinks twice 0 1sec ON 0 1sec OFF 0 1sec ON 0 7sec...

Page 68: ...t to the outdoor power circuit board TABN1 I Not used N2 Connect to the outdoor power circuit board TABN2 N1 Non connect P Connect to the out door power circuit board TABP2 DCL L1 L2 ACTM P I N1 N2 Load Connection and internal circuit diagram Connect to the outdoor power circuit board CNAF 1 GND 2 1 15V DC 3 1 Control signal 4 5 Not used 6 1 Control signal ...

Page 69: ...it board TABN1 Io Connect to the outdoor power circuit board TABN2 N2 Non connect N1 Non connect P Connect to the outdoor power circuit board TABP2 Connect to the outdoor power circuit board CNAF 1 GND 2 1 15V DC 3 1 Control signal 4 5 Not used 6 1 Control signal Upper side Lower side DCL L1 L2 ACTM P I N1 N2 Load Connection and internal circuit diagram ...

Page 70: ...ard BC 2 branch box controller unit Number 2 2 blinking LED2 branch box controller board 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 9 8 FUNCTION OF SWITCHES CONNECTORS AND JUMPERS 1 Function of switches Forced defrost should be done as follows 1Change the DIP SW1 1 on the outdoor controller board from OFF to ON 2Forced de...

Page 71: ...n While unit stopping Normal Normal Inactive 30 minutes Normal Changed 60 minutes 3 A down Active 1 2 3 4 1 2 3 4 5 6 1 2 3 ON OFF No Function Effective timing Action by the switch operation No function Switching the target sub cool Heating mode No function No function Demand switching function No function Max Frequency down No function No function No function No function No function No function S...

Page 72: ... 3 4 5 6 1 2 3 4 5 6 1 2 3 ON OFF No Function Effective timing Action by the switch operation No function Switching the target sub cool Heating mode No function No function Demand switching function No function Max Frequency down No function No function No function No function No function No function Switch SW5 SW7 Dip switch SW8 Type of Switch Target sub cool down Capability cut 50 Active Normal ...

Page 73: ...c E0 E7 63L connector red is open 63H connector yellow is open 2 connectors 63H 63L are open Branch box outdoor communication error Signal receiving error Outdoor unit Indoor branch box communication error Signal receiving error Branch box Branch box outdoor communication error Transmitting error Outdoor unit Indoor branch box communication error Transmitting error Branch box Miswiring of indoor b...

Page 74: ...le When 2450 hours 245 10 hours 0 5 secs 0 5secs 2 secs 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Compressor operating current 0 50 LEV opening pulse 0 500 0 50 wOmit the figures after the decimal fractions 0 500 When it is 100 pulse or more hundreds digit tens digit and ones digit are displayed by turns Example When 150 pulse 0 5 secs 0 5secs 2 secs A Pulse Error postponement code history 1 of...

Page 75: ...it are displayed by turns Example When 15 0 5 secs 0 5secs 2 secs A Code display Code display 0 50 When no error history 0 and are displayed by turns When no error history 0 and are displayed by turns 1 ON 2 3 4 5 6 Thermostat ON time 0 999 Test run elapsed time 0 120 0 999 When it is 100 minutes or more the hundreds digit tens digit and ones digit are displayed by turns Example When 245 minutes 0...

Page 76: ...re is 0 or less and temperature are displayed by turns 39 88 When the temperature is 0 or less and temperature are displayed by turns 39 88 When the temperature is 0 or less and temperature are displayed by turns of f 8 39 Branch box pipe temperature gas 39 88 Targeted evaporating temperature ETm Cooling Targeted high pressure Pdm Heating 39 88 Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit...

Page 77: ...100V or more hundreds digit tens digit and ones digit are displayed by turns V 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 SW2 setting 1 ON 2 3 4 5 6 Display detail Explanation for display Unit 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Indoor setting temperature 17 30 Outdoor pipe temperature Cond Eva TH6 39 88 Outdoor heatsink temperature TH8 40 200 17 30 39 88 W...

Page 78: ...63HS 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Code display Operation frequency on error occurring 0 255 0 255 When it is 100Hz or more hundreds digit tens digit and ones digit are displayed by turns Example When 125Hz 0 5 secs 0 5secs 2 secs 1 ON 2 3 4 5 6 Hz Fan step on error occurring 0 10 0 10 1 ON 2 3 4 5 6 Step 25 1 1 ON 2 3 4 5 6 Pulse LEV opening pulse on error occurring ...

Page 79: ...200 40 200 When the temperature is 0 C or less and temperature are displayed by turns When the temperature is 100 C or more hundreds digit tens digit and ones digit are displayed by turns 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 15 15 15 15 Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8 0 1 0 1 0 1 0...

Page 80: ...onement period Code display 1 ON 2 3 4 5 6 Code display Code of the difference between room temperature and set temperature Tj 0 99 Tens digit of code current Tj Units digit of code Tj a minute ago tj Cooling Heating tj room temp Set temp tj Set temp room temp Code of the difference between room temperature and set temperature tj 0 1 2 3 4 5 6 7 8 9 000 100 010 110 001 101 011 111 Indoor unit 1 In...

Page 81: ... second interval LED1 Lighting 1 ON 2 3 4 5 6 Pipe temperature Liquid TH3 40 90 40 90 When the coil thermistor detects 0 or below and temperature are displayed by turns Example When 10 0 5 secs 0 5secs 2 secs 10 1 ON 2 3 4 5 6 Discharge temperature TH4 3 217 3 217 When the discharge thermistor detects 100 or more hundreds digit tens digit and ones digit are displayed by turns Example When 105 0 5 ...

Page 82: ... indoor C 0 14 Code display Code display Code display 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Capacity setting indoor D 0 14 Code display LEV D opening pulse 0 500 0 500 When it is 100 pulse or more hundreds digit tens digit and ones digit are displayed by turns Example When 150 pulse 0 5 secs 0 5secs 2 secs Pulse 1 50 LEV E opening pulse 0 500 0 500 When it is 100 pulse or more hundreds digit tens digit an...

Page 83: ...9 88 When the temperature is 0 or less and temperature are displayed by turns 39 88 When the temperature is 0 or less and temperature are displayed by turns 0 500 Pulse Pulse 0 500 Indoor pipe temperature Liquid TH2 Indoor E 39 88 LEV 1 opening pulse 0 500 1 ON 2 3 4 5 6 Pulse 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 LEV 3 opening pulse 0 500 LEV 4 opening pulse 0 500 0 500 Pulse Pulse 0 500 LEV 5 opening pu...

Page 84: ...r display Unit 1 ON 2 3 4 5 6 Indoor pipe temperature Cond Eva TH5 Indoor A 39 88 Indoor pipe temperature Cond Eva TH5 Indoor B 39 88 1 ON 2 3 4 5 6 Indoor pipe temperature Cond Eva TH5 Indoor C 39 88 1 ON 2 3 4 5 6 Indoor pipe temperature Cond Eva TH5 Indoor D 39 88 Indoor pipe temperature Cond Eva TH5 Indoor E 39 88 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Outdoor heatsink temperature TH8 40...

Page 85: ...TH B 39 88 1 ON 2 3 4 5 6 Branch pipe temperature TH C 39 88 Branch pipe temperature TH D 39 88 Branch pipe temperature TH E 39 88 TH1 Indoor A 8 39 8 39 TH1 Indoor B 8 39 8 39 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 TH1 Indoor C 8 39 8 39 TH1 Indoor D 8 39 8 39 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 8 39 1 ON 2 3 4 5 6 TH1 Indoor E 8 39 ...

Page 86: ...16 31 Indoor A 16 31 Indoor setting temperature 16 31 Indoor B 16 31 Indoor setting temperature 16 31 Indoor C 16 31 Indoor setting temperature 16 31 Indoor D 16 31 Indoor setting temperature 16 31 Indoor E 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 16 31 ...

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