Fujitsu AS* G09LECB Service Instruction page 23

3. ANTIFREEZING CONTROL (Cooling and Dry mode)
The compressor speed is decreased 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 22 : Anti-freezing protection operation / Release temperature)
Outdoor temperature
Over than 10°C
*2
or 12°C
*1
Less than 10°C
*2
or 12°C
*1
4. COOLING PRESSURE OVERRISE PROTECTION
When the outdoor unit heat exchange sensor temperature rises to
the compressor and the outdoor fan motor are stopped and trouble display is performed.
5. HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE )
On heating mode, the compressor frequency is controlled as following based on the
detection value of the indoor heat exchanger temperature sensor.
[ Control System ]
Indoor heat exchange
temperature rises
63°C
The compressor frequency is
decreased 25rps every 120seconds.
55°C
The compressor frequency is
decreased 3rps every 60seconds.
53°C
It returns to the normal operation
Temperature Temperature
4°C
*1. When the temperature rises.
*2. When the temperature drops.
Compressor is stopped
Stable zone
Indoor heat exchange
temperature drops
7°C
13°C
67°C
50°C
01-20
or greater,