High Pressure Protection; Low Outdoor Temperature Protection; High Temperature And High Pressure Release Control - Fujitsu AGYG12KVCA Service Manual

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: AOYG09KVCA, AOYG12KVCA, and AOYG14KVCA
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