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8. Reversing valve control circuit
DC voltmeter
or multimeter
Reversing valve control circuit will switch reversing valve ON/OFF(cooling ON) according to instruction
from indoor microcomputer depending on the operation condition shows in Table 8-1.
Voltage at Q701 (between Collector and Emittor) in each operation condition is approximately as shown
in Table 8-1 when measured by multimeter.
Cooling
Heating
Dehumidifying
Power P.W.B.
Reversing
CN2
valve
2
D701
4
Q701
V
D-0V
Operation condition
General operation of cooling
In normal heating operation
MAX. rotation speed instructed by indoor
microcomputer after defrost is completed
Defrosting
Sensor dry
C-35V
12V
R701
PQ701
CN4B
R705
6
R706
Fig. 8-1
Table 8-1
- 121 -
MAIN P.W.B.
Microcomputer
CN4A
6
24
Collector voltage of Q701
About 0.8V
About 35V
About 35V
About 0.8V
About 0.8V
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