Current Release Control; Low Pressure Protection Control (Cooling Mode) - Fujitsu AO G36KBTB Series Service Instruction

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.
¢ Model: AOHG36KBTB
Operation mode
Cooling
Heating
¢ Models: AOHG45KBTB and AOHG54KBTB
Operation mode
Cooling
Heating

8-4. Low pressure protection control (cooling mode)

• After the compressor start-up and 10 minutes has passed
When the pressure sensor detected value is 0.68MPaG or less continues for 1minute, the com-
pressor frequency -8rps.
• After the frequency of the compressor -8rps and 1 minute has passed
When the pressure sensor detected value is 0.68MPaG or less, continues for 1 minute, the com-
pressor continues frequency -8rps every 1 minute until the detected value becomes more than
0.68MPaG.
When the detected value becomes more than 0.78MPaG, this protection is released.
• After the compressor start-up and 1 minute has passed
The detected value of pressure sensor is 0.02MPaG or less, continues for 5 minutes, the com-
pressor is stopped.
8-3. Current release control
Outdoor temp. (Ta)
52°C ≤ Ta
50°C ≤ Ta < 52°C
42°C ≤ Ta < 50°C
2°C ≤ Ta < 42°C
Ta < 2°C
2°C ≤ Ta
Ta < 2°C
Outdoor temp. (Ta)
52°C ≤ Ta
50°C ≤ Ta < 52°C
46°C ≤ Ta < 50°C
42°C ≤ Ta < 46°C
2°C ≤ Ta < 42°C
Ta < 2°C
2°C ≤ Ta
Ta < 2°C
Release of protection
0.78MPaG
-8rps every 1 minute
0.68MPaG
0.02MPaG
Compressor stop
(When continues for 5 minutes)
- (01-36) -
Trigger condition
8.0 A
12.0 A
14.0 A
18.0 A
20.0 A
18.0 A
20.0 A
Trigger condition
10.0 A
13.0 A
15.0 A
18.0 A
20.0 A
24.0 A
20.0 A
24.0 A
Hold
Release condition
7.5 A
11.5 A
13.5 A
17.5 A
19.5 A
17.5 A
19.5 A
Release condition
9.5 A
12.5 A
14.5 A
17.5 A
19.5 A
23.5 A
19.5 A
23.5 A
8. Various protections