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
ＲＬ５
４
３
２
１
REVERSINGVALVE
Ｄ４０１
ＣＮ２
ＲＬ５
Ｖ
０Ｖ
３５Ｖ
１２Ｖ
５
ＩＣ２
１２
３６
HybridICBOARD
３６
REVERSINGVALVE
ＭＩＣＲＯＣＯＭＰＵＴＥＲ
68
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