Reversing Valve - Hitachi RAF-25RPA Service Manual

6. Reversing valve control circuit
Ｖ
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.
Cooling
Heating
Dehumidifying

REVERSING VALVE

４
３
２
１
Ｃ Ｎ ２
１ ２ Ｖ
３ ６
Ｒ Ｌ ５
Operation condition
General operation of Cooling
In normal heating operation
MAX. rotation speed instructed
by indoor microcomputer after
defrost is completed
Defrosting
Sensor dry
Ｒ Ｌ ５
Ｄ ４ ０ １
１ ２ ３ ６
５
Fig. 6-1
Table 6-1
Collector voltage of D401
68
３ ５ Ｖ
０ Ｖ
Ｍ Ｉ Ｃ Ｒ Ｏ Ｃ ＯＭ Ｐ Ｕ Ｔ Ｅ Ｒ
REVERSING VALVE
About 35V
About 0V
About 0V
About 35V
About 35V