Fujitsu ASU9RL - Page 32

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 19 : Anti-freezing Protection Operation / Release Temperature)
4. COOLING PRESSURE OVERRISE PROTECTION
When the outdoor unit heat exchange sensor temperature rises to 153
°F(67°C) or greater,
the compressor is 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.
05-18
Indoor heat exchange
temperature
[ Control System ]
It returns to the normal operation
127°F
(53°C)
122°F
(50°C)
Outdoor temperature
Over than 50
°F(10°C) *1
or
54°F(12°C) *2
Less than 50°F(10°C) *1
or
54°F(12°C) *2
*1. When the temperature rises.
*2. When the temperature drops.
39°F(4°C)
45°F(7°C)
55°F(13°C)
Temperature Temperature
The compressor frequency is
decreased 3Hz every 60seconds.