Fujitsu AIRSTAGE ASEH09KHCBN Service Manual page 171

8-7. High temperature and high pressure release control
The compressor is controlled as follows.
• Cooling 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
• 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
8-7. High temperature and high pressure release control
Indoor unit heat exchanger
temperature drops
Zone A
Zone B
Zone C
Stable zone
DE
Zone E
Indoor unit heat exchanger
temperature drops
Zone A
Zone B
Zone C
Stable zone
DE
Zone E
- (04-37) -
AB: 61°C
BC: 60°C
CD: 59°C
DE: 54°C
Operation
AB: 63°C
BC: 55°C
CD: 53°C
DE: 50°C
Operation
-30 rps/30 sec.
-5 rps/60 sec.
-25 rps/120 sec.
-3 rps/60 sec.
8. Various protections