Compressor Temperature Protection; High Pressure Protection; Low Outdoor Temperature Protection; High Temperature And High Pressure Release Control - Fujitsu AO G30KATA Series Service Instruction

7-5. Compressor temperature protection

When the compressor temperature sensor detects higher than the trigger condition below, the com-
pressor is stopped. When the compressor temperature sensor detects the release condition, the pro-
tection is released.
Trigger condition
Release condition

7-6. High pressure protection

Trigger condition
Release condition

7-7. 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

7-8. High temperature and high pressure release control

The compressor is controlled as follows.
¢ Models: AOEG30KATA, AOEG36KATA, and AOEG45KATA
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
7-5. Compressor temperature protection
Indoor unit heat exchanger
temperature drops
Stable zone
DE
- (01-31) -
108°C
80°C
(3 minutes after compressor stop)
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
-20°C
-15°C
AB: 63°C
BC: 55°C
CD: 53°C
DE: 50°C
Operation
Heating
-15 rps/120 sec.
-2 rps/120 sec.
7. Various protections