User manual TOSHIBA MM-A0280CT SERVICE MANUAL

[. . . ] A90-0132 Modular Multi System Service Manual Air Conditioner - Multi Split Type System HFC R407C 2 Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Outline of MMS (Modular Multi System) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Parts Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Yes No Replace TS sensor. Insufficient refrigerant, blockage, pipe breakage. Check code [AA] High pressure sensor (Pd) short circuit Operation cause Pd sensor output voltage alarm If there is an abnormal output voltage of Pd sensor: Check connector circuit (Pd sensor: CN501) and output voltage of the sensor. If the sensor is normal, replace the outdoor interface PC board. 14 99 Troubleshooting Diagnostic procedure for check code Check code [Ab] Pressure sensor (Pd/Ps) miswiring Operation cause 1. Compressor inverse operation, compressor error Is the pipe connection position of Pd sensor/Ps sensor correct ?sensor: CN501 [ Pd sensor: CN500 ] Ps Are the output voltage characteristics of Pd sensor/Ps sensor normal ?No Yes Are the pressure characteristics normal when compressor is operating ?No Yes Check the interface board. Modify wiring. Check compressor. 14 100 Troubleshooting Diagnostic procedure for check code Check code [AE] Low Hz time discharge temp. Outdoor unit service valve closed Cooling bypass PMV error TD1 sensor error Insufficient refrigerant, blockage in pipe Blockage of indoor filter Blockage of PMV assembly on the liquid line Are the gas pipe and liquid pipe service valves of the outdoor unit fully open ?Yes No Open valves fully. Is there a blockage in the PMV assembly on the liquid line ?No Yes Replace both the PMVs. Is the cooling bypass PMV B normal ?Yes No Cooling bypass PMV B error Are the resistance characteristics of TD1 sensor normal ?Yes No Set normal wiring. (Check miswiring of the outdoor unit according to miswiring check function. ) Insufficient refrigerant, blockage, pipe breakage. 14 Check code [AF] Outdoor unit power source phase order miswiring Operation cause Abnormal power phase order or missing phase of power supply to the outdoor unit There is an abnormal power phase order or missing phase of power supply to the outdoor unit. Check power supply wiring. 101 Troubleshooting Diagnostic procedure for check code Check code [b4] Low pressure sensor (Ps) short circuit Operation cause 1. sensor: CN501 [ Pd sensor: CN500 ] Ps Are the output voltage characteristics of Ps sensor normal ?Yes No Sensor error Is the low pressure below 0. 95MPa during operation of compressor ?Yes No Check compressor. Check interface PC board. Check code [b5] External input display fault [b6] External interlock display fault Is the external device connected to connector CN17 ?If defective, replace. 14 Is the external device operating normally ?If defective, replace. Check cause of the operation. Check code [b9] Indoor pressure sensor short circuit Operation cause Output voltage error of indoor pressure sensor There is an abnormal output voltage of indoor pressure sensor. If the sensor is normal, replace the indoor PC board. 102 Troubleshooting Diagnostic procedure for check code Check code [bb] Discharge temperature (TD2) alarm Operation cause 1. Outdoor unit service valve closed Cooling bypass PMV error TD sensor error Insufficient refrigerant, blockage in pipe Blockage of PMV assembly on the liquid line Are the gas pipe and liquid pipe service valves of the outdoor unit fully open ?Yes No Open valves fully. Is there a blockage in the PMV assembly on the liquid line ?No Yes Replace both the PMVs. Is the cooling bypass PMV B normal ?Yes No Cooling bypass PMV B error Are the resistance characteristics of TD2 sensor normal ? [. . . ] SENSOR CLIP REFRIGERATION ASSEMBLY REFRIGERATION ASSEMBLY REFRIGERATION ASSEMBLY REFRIGERATION ASSEMBLY MF CAPACITOR MF CAPACITOR N028 1 N042 1 N056 N080 1 Ref. 10 10 11 43155138 43155120 43A80006 43A80007 43A50027 43A50021 43A50022 43A58004 43A60025 43A60012 43A69025 43A69024 43A49009 43A46037 43A70004 43170197 43A88013 Description MF CAPACITOR MF CAPACITOR FILTER FILTER TEMP. SENSOR - LIQUID (TC2) TRANSFORMER (MMS) TERMINAL BLOCK `ABC PQ E' TERMINAL BLOCK `E-L-N' PCB CONTROL (CM**CO2) PCB POWER (P**RC01) PRESSURE SENSOR (Service) PULSE MOTOR VALVE - COIL DRAIN CATCH ASSEMBLY DRAIN HOSE OWNER'S MANUAL N028 N042 N056 1 N080 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11 12 13 14 15 16 17 18 19 20 21 22 23 24 20 165 Exploded views and service parts Indoor units Low Wall MM-S056, MM-SR056, MM-S080, MM-SR080 38 37 40 34 36 4 22 8 24 29 35 41 46 39 32 31 30 23 25 15 33 10 42 27 28 3 17 13 18 26 44/45 19 16 1 5 14 43 7 6 12 21 20 11 9 2 Ref. 01 02 03 04 05 06 07 08 08 09 10 11 12 13 14 15 16 17 17 18 19 20 21 43107214 43A50006 43107216 43107223 43107222 43109321 43109322 43109324 43109320 43109329 43119373 43119393 43119394 43120172 43A21005 43125131 43125142 43125143 43125141 43126127 43126128 43A39004 43A39005 43A44080 43A44081 43155101 43155138 Description HINGE TEMP. 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