Fujitsu AU G18LVLB Series Service Instruction page 28

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 14 : 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
*1. When the temperature rises.
*2. When the temperature drops.
4. HIGH PRESSURE OVER RISE PROTECTION
The compressor frequency is controlled as following based on the detection value
of the high pressure sensor.
(Fig 13 : High Pressure Over Rise Protection Control)
[Cooling mode]
High Pressure
Compressor is OFF
4.1MPaG
The compressor frequency is
decreased 5 rps every 120 seconds.
4.0MPaG
Release
Temperature Temperature
4°C
Stable range
Release
7°C
13°C
[Heating mode]
High Pressure
4.1MPaG
The compressor frequency is
decreased 7 rps every 60 seconds.
3.5MPaG
The compressor frequency is
decreased 1 rps every 60 seconds.
3.8MPaG 3.3MPaG
01-25
Compressor is OFF
Release Stable range
Release
3.0MPaG