User manual TOSHIBA MM-A0224HT SERVICE MANUAL
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Manual abstract: user guide TOSHIBA MM-A0224HTSERVICE MANUAL
Detailed instructions for use are in the User's Guide.
[. . . ] 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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