Various Protections - Fujitsu AU*G30LRLE series Service Instruction

23. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENTION CONTROL
The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas temperature.
When the discharge temperature becomes higher than Temperature , the compressor frequency
is decreased 10rps and it continues to decrease the frequency
for 10rps every 120 seconds until the temperature becomes lower than Temperature .
When the discharge temperature becomes lower than Temperature , the control of the
compressor frequency is released.
When the discharge temperature becomes higher than Temperature
and the indoor unit LED starts blinking.
( Table 19 : Discharge Temperature Over Rise Prevention Control / Release Temperature )
AO* G30/ 36LETL
2. CURRENT RELEASE CONTROL
The compressor frequency is controlled so that the outdoor unit input current does not exceeds
the current limit value that was set up with the outdoor temperature.
The compressor frequency returns to the designated frequency of the indoor unit at the time
when the frequency becomes lower than the release value.
( Table 20 : Current Release Operation Value / Release Value )
[ Cooling ]
AO* G30LETL
T0 (Control / Release)
9.0A / 8.5A
50°C
10.0A / 9.5A
46°C
12.5A / 12.0A
40°C
14.5A / 14.0A
12°C
14.5A / 14.0A
2°C
14.5A / 14.0A
T0 : Outdoor Temperature
3. ANTIFREEZING CONTROL (Cooling and Dry mode)
The compressor frequency is decrease on cooling & dry mode when the indoor heat exchanger
temperature sensor detects the temperature lower than Temperature .
Then, the anti-freezing control is released when it becomes higher than Temperature .
( Table 21 : Anti-freezing Protection Operation / Release Temperature )
Outdoor temperature
Over than 10°C
*1
or 12°C
*2
Less than 10°C
*1
or 12°C
*2
Temperature
104°C
AO* G36LETL
T0 (Control / Release)
9.0A / 8.5A
50°C
10.0A / 9.5A
46°C
13.0A / 12.5A
40°C
16.5A / 16.0A
12°C
16.5A / 16.0A
2°C
16.5A / 16.0A
T0 : Outdoor Temperature
Temperature
4°C
*1. When the temperature drops.
*2. When the temperature rises.
, the compressor is stopped
Temperature
Temperature
101°C
[ Heating ]
AO* G30LETL
T0 (Control / Release)
10.0A / 9.5A
17°C
11.5A / 11.0A
12°C
14.5A / 14.0A
5°C
14.5A / 14.0A
T0 : Outdoor Temperature
Temperature
7°C
13°C
01-21
110°C
AO* G36LETL
T0 (Control / Release)
10.0A / 9.5A
17°C
11.5A / 11.0A
12°C
16.0A / 15.5A
5°C
18.0A / 17.5A
T0 : Outdoor Temperature