Compressor Stop Control - Fujitsu AB*A30LBT Service Instruction

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. COOLING PRESSURE OVERRISE PROTECTION
When the outdoor unit heat exchange sensor temperature rises to 67
the compressor is stopped and trouble display is performed.
After 3 minutes ST, release of protection.
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
55°C
The compressor frequency is
decreased 3Hz every 60seconds.
53°C
It returns to the normal operation
Compressor Operation
73Hz or greater
70 36Hz
33 27Hz

5-22. COMPRESSOR STOP CONTROL

When the detection value of outdoor temperature sensor is lower than temperature
in the table below, the compressor is stopped.
(Table 15 : Operation temperature of compressor stop control)
Operation
temperature
Temperature Temperature
4°C
Refer to below
70Hz
Frequency down every 120 sec
23Hz
23Hz OFF
Temperature
Cooling Heating
- 20°C
7°C
13°C
52°C
50°C
05-20
or greater,
°C