4 .
E l e c t r i c a l c h e c k s o f m a i n p a r t s
Index
4.1.1 Power circuit .................................................................................................................................................. 36
4.1.2 Power circuit (low voltage) ............................................................................................................................ 38
4.1.3 PCB for power circuit ..................................................................................................................................... 39
4.1.4 Reversing valve control circuit ....................................................................................................................... 39
4.1.5 Temperature detection circuit ........................................................................................................................ 40
4.1.6 Electric expansion valve circuit ..................................................................................................................... 41
4.1.7 DC fan motor control circuit ........................................................................................................................... 42
4.1.8 Fan motor ..................................................................................................................................................... 43
4.1.9 Reactor .......................................................................................................................................................... 43
4.1.10 Compressor motor ....................................................................................................................................... 44
4.1.11 Thermistor for outside air temperature (Ta) ................................................................................................. 45
4.1.12 Thermistor for overheat temperature (Td) ................................................................................................... 46
4.1.13 Thermistor for defrost (HEX) temperature (Te) ............................................................................................ 47
4.2.1 Safety thermostat (water temperature safety device) .................................................................................... 48
4.2.2 Electrical heater ............................................................................................................................................ 49
4.2.3 DHW Thermistor ............................................................................................................................................ 49
4 Electrical checks of main parts
SMGB0135 rev.0 - 06/2020
35
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