Current Release Control; Cooling Pressure Over-Rise Protection; Low Outdoor Temperature Protection - Fujitsu ASUG09LZAS Service Manual

8-3. Current release control

The compressor frequency is controlled so that the outdoor unit input current does not exceeds cur-
rent limit value set according to the outdoor temperature.
The compressor frequency returns according to the operation mode, when the current becomes low-
er than the release value.
¢ Models: AOUG09LZAS1 and AOUG12LZAS1
Operation mode
Cooling
Heating
¢ Model: AOUG15LZAS1
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. 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
8-3. 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
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
- (04-30) -
Trigger condition
4.5 A
4.5 A
6.0 A
8.5 A
8.5 A
8.5 A
7.0 A
9.0 A
10.0 A
10.0 A
Trigger condition
4.5 A
4.5 A
6.0 A
9.0 A
9.0 A
9.0 A
7.0 A
9.0 A
11.0 A
12.5 A
65°C
Cooling/Dry
-15°C
-10°C
Release condition
4.0 A
4.0 A
5.5 A
8.0 A
8.0 A
8.0 A
6.5 A
8.5 A
9.5 A
9.5 A
Release condition
4.0 A
4.0 A
5.5 A
8.5 A
8.5 A
8.5 A
6.5 A
8.5 A
10.5 A
12.0 A
Heating
-20°C
-15°C
8. Various protections