High Temperature And High Pressure Release Control - Fujitsu General ARXG45KHTB Service Manual

7-8. High temperature and high pressure release control

The compressor is controlled as follows.
• Cooling mode
Indoor unit heat exchanger
temperature rises
AB
BC
Zone C
Zone
Zone A Compressor is stopped.
Zone B The compressor frequency is decreased.
Zone C
The protection is released and the operation is returned to normal mode.
Zone D
• Heating mode
Indoor unit heat exchanger
temperature rises
AB
BC
CD
Zone D
Zone
Zone A Compressor is stopped.
Zone B
The compressor frequency is decreased.
Zone C
Zone D
The protection is released and the operation is returned to normal mode.
Zone E
7-8. High temperature and high pressure release control
Indoor unit heat exchanger
temperature drops
Zone A
Zone B
Stable zone
CD
Zone D
Indoor unit heat exchanger
temperature drops
Zone A
Zone B
Zone C
Stable zone
DE
Zone E
- (04-31) -
AB: 64°C
BC: 60°C
CD: 58°C
Operation
AB: 63°C
BC: 53°C
CD: 50°C
DE: 48°C
Operation
-7 rps/120 sec.
-7 rps/120 sec.
-1 rps/120 sec.
7. Various protections