8-5. High pressure protection
Trigger condition
Release condition
8-6. Low outdoor temperature protection
When the outdoor temperature sensor detects lower than the trigger condition below, the compres-
sor is stopped.
Operation mode
Trigger condition
Release condition
8-7. High temperature and high pressure release control
The compressor is controlled as follows.
¢ Models: AOYG09KVCBN, AOYG12KVCBN, and AOYG14KVCBN
Indoor unit heat exchanger
temperature rises
Zone A
AB
Zone B
BC
Zone C
CD
Zone D
Zone E
Zone
Zone A
Compressor is stopped.
Zone B
The compressor frequency is decreased.
Zone C
Zone D
The protection is released and the operation is returned to normal mode.
Zone E
8-5. High pressure protection
Indoor unit heat exchanger
temperature drops
Stable zone
DE
- (04-31) -
Pressure switch: Off (Open: Higher than 4.2 MPa)
Compressor stop
Pressure switch: On (Close: Lower than 3.2 MPa)
(3 minutes after compressor stop)
Compressor restart
Cooling/Dry
-15°C
-10°C
AB:
63°C
BC:
55°C
CD:
53°C
DE:
50°C
Operation
Heating
-20°C
-15°C
-25 rps/120 sec.
-3 rps/60 sec.
8. Various protections