6. Reversing valve control circuit
Fig. 6-1
Reversing valve control circuit will switch reversing valve ON/OFF according to instruction from indoor
microcomputer depending on the operation condition shows in Table 6-1.
Voltage at D401 (between anode and cathode) in each operation condition is approximately as shown
in Table 6-1 when measured by multimeter.
Operation condition Collector voltage of D401
Cooling General operation of Cooling
In normal heating operation
Defrosting
Sensor dry
MAX. rotation speed instructed
by indoor microcomputer after
defrost is completed
Heating
Dehumidifying
About 35V
About 35V
About 35V
About 0V
About 0V
Table 6-1
䌒䌌䋵
䋴
䋳
䋲
䋱
REVERSING VALVE
䌄䋴䋰䋱
䌃䌎䋲
䌒䌌䋵
䌖
䋰䌖
䋳䋵䌖
䋱䋲䌖
䋵
䌉䌃䋲
䋱䋲
䋳䋶
Hybrid IC BOARD
䋳䋶
REVERSING VALVE
䌍䌉䌃䌒䌏䌃䌏䌍䌐䌕䌔䌅䌒
75
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