Fujitsu ARYG72LHTA - Page 24

01-20
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 18 : 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°C
7°C
13°C
Temperature Temperature
68°C
63°C
4. COOLING PRESSURE OVER RISE PROTECTION
On cooling mode, the compressor frequency is controlled as following based on the
detection value of the outdoor heat exchanger temperature sensor.
Outdoor heat exchange
temperature
(Fig.11 : Cooling Pressure Over Rise Protection Control)
Compressor is OFF
The compressor frequency is
decreased 5rps every 120seconds.
Release of protection
5. HIGH PRESSURE OVER RISE PROTECTION
The compressor frequency is controlled as following based on the detection value
of the high pressure sensor.
(Fig 12 : High Pressure Over Rise Protection Control)
High Pressure
4.1MPa
4.0MPa
3.8MPa
Compressor is OFF
The compressor frequency is
decreased 5 rps every 120 seconds.
Stable rangeRelease
Release
High Pressure
4.1MPa
3.3MPa
3.0MPa
2.8MPa
Compressor is OFF
The compressor frequency is
decreased 7 rps every 60 seconds.
The compressor frequency is
decreased 1 rps every 60 seconds.
Stable rangeRelease
Release
[Cooling mode] [Heating mode]