Current Release Control; Cooling Pressure Over-Rise Protection; Compressor Temperature Protection; High Pressure Protection - Fujitsu General ASHG07KPCE Service Manual

8-3. Current release control

The rotation number of compressor is controlled so that the outdoor unit input current does not ex-
ceeds current limit value set according to the outdoor temperature.
The rotation number of compressor returns according to the operation mode, when the current be-
comes lower than the release value.
¢ Models: AOHG07KPCA, AOHG09KPCA, and AOHG12KPCA
Operation mode
Cooling
Heating

8-4. Cooling pressure over-rise protection

When the outdoor unit heat exchanger temperature reaches trigger condition below, the compressor
is stopped and trouble display is performed.
Trigger condition

8-5. 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

8-6. High pressure protection

Trigger condition
Release condition
8-3. Current release control
Outdoor temp. (Ta)
50°C ≤ Ta
46°C ≤ Ta < 50°C
40°C ≤ Ta < 46°C
12°C ≤ Ta < 40°C
2°C ≤ Ta < 12°C
Ta < 2°C
17°C ≤ Ta
12°C ≤ Ta < 17°C
5°C ≤ Ta < 12°C
Ta < 5°C
- (04-28) -
Trigger condition
4.0 A
4.0 A
5.0 A
6.0 A
6.0 A
6.0 A
5.5 A
7.0 A
7.5 A
8.5 A
65°C
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
Release condition
3.5 A
3.5 A
4.5 A
5.5 A
5.5 A
5.5 A
5.0 A
6.5 A
7.0 A
8.0 A
8. Various protections