Super Multi System - Toshiba

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62 Troubleshooting Diagnostic procedure for check code Check code Operation cause [dA] 1. Power supply failure. Abnormal overheat of heat sink 2. Outdoor fan error. Refer to outdoor unit 3. Heat sink installation failure. 4. Blockage of heat sink cooling duct. 5. Defective inverter PC board. Is power supply voltage normal ? � Is the wiring connector connection normal on the inverter PC board ? � Yes Yes Is outdoor fan normal ? � Is there a screw loose on the IGBT module or heat sink on inverter PC board ? � Yes No Is there a blockage in the heat sink cooling duct ? No � Check inverter PC board. No No No Yes Yes � � � � � Check power supply. Check the circuit wiring, for example wiring to the inverter compressor or connector connection. Check fan and fan motor. Tighten screws. Remove blockage.
Control features Outdoor unit No. Control Description Diagram 1 Defrost During heating operation, defrost is (Heating mode) controlled by the outdoor unit heat exchanger temperature sensor (TE). When the cumulative operating time with TE in zone [A] has amounted to 25 minutes, defrost operation starts. Subsequent defrosts occur after a cumulative time of 55 minutes. When heating operation resumes after defrost, the timer is reset. The maximum defrost period after TE returns to zone [B] is 1 minute. Heating operation resumes immediately after TE returns to zone [C]. 2 Oil retrieval During cooling operation, oil retrieval is (Cooling mode) performed if one or more Indoor units are OFF. If this condition is satisfied, when cooling operation commences, oil retrieval takes place for 1 minute. If cooling operation continues, oil retrieval is repeated for 1 minute every 60 minutes. During oil retrieval the following occurs: a. All Multi Controller PMVs are opened. The degree of opening is dependant on the capacity of the Indoor unit . b. If the D.O.L. compressor is OFF the inverter compressor speed increases to SD. When cooling operation ends the timer is reset. 3 Superheat control Superheat is controlled by the Multi (Cooling mode) Controller for cooling operation. The level of superheat is determined by the difference between the evaporator outlet temperature for each indoor unit (ThA, B, C, D) and the saturation temperature (ThX). If the superheat of an indoor unit enters zone [Y], the relevant M/C PMV opens further to compensate for this increase. The degree of additional opening is dependant on the capacity of the indoor unit. When zone [Z] is reached the PMV opening is held at the level set in zone [Y]. When the level of superheat returns to zone [X] the control is cancelled. Temp. (°C) Oil retrieval 12 8 -3 Superheat (°C) A Cooling mode C B 60 min. < 60 min. 1 min. 1 min. 13 9 Y X Oil retrieval Z Compr. off Timer reset 63
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Super Multi System HFC R407C A90-02
Page 4 and 5:
4 Introduction Precautions Please r
Page 6 and 7:
Components - 3 pipe system 1. Outdo
Page 8 and 9:
8 Introduction Super multi system b
Page 10 and 11:
10 Introduction Components Setting
Page 12 and 13: 12 Parts specification Outdoor unit
Page 14 and 15: 14 Parts specification Outdoor unit
Page 16 and 17: MAR-F105HTM8-PE Dimensional drawing
Page 18 and 19: MAR-F105HTM8-PE 18 Wiring diagrams
Page 20 and 21: 20 Wiring diagram Multi Controllers
Page 22 and 23: 22 Refrigeration piping schematic d
Page 24 and 25: 24 Refrigeration piping schematic d
Page 26 and 27: 26 Diagnostic procedure Outdoor uni
Page 28 and 29: 28 Diagnostic procedure Outdoor uni
Page 30 and 31: 9. Outdoor unit - pressure sensor d
Page 32 and 33: 32 Diagnostic procedure Multi Contr
Page 34 and 35: 34 Fault code display Self-diagnost
Page 36 and 37: 04 No communication signal between
Page 38 and 39: 38 Is 4-way valve coil connector co
Page 40 and 41: 40 Is drain pump connected? Does fl
Page 42 and 43: 42 Troubleshooting Diagnostic proce
Page 44 and 45: Check code Status of air conditione
Page 46 and 47: Check code Operation cause [21] 1.
Page 48 and 49: Check code Operation cause [E5] 1.
Page 54 and 55: Check code [A0] Operation cause Dis
Page 58 and 59: 58 C � Does heating indoor fan op
Page 64 and 65: 64 Control features Outdoor unit/Mu
Page 66 and 67: 66 Valve and sensor function and op
Page 68 and 69: 68 Valve and sensor function and op
Page 70 and 71: Leak position check 70 Refrigerant
Page 72 and 73: Additional refrigerant One Multi Co
Page 74 and 75: 74 Exploded view and service parts
Page 80: www.toshiba-aircon.co.uk MADE IN UK
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Super Multi System - Toshiba

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