High Temperature And High Pressure Release Control - Fujitsu ACUH09LUAS1 Service Manual

8-7. High temperature and high pressure release control

The compressor is controlled as follows.
¢ Models: AOUH09LUAS1, AOUH12LUAS1, and AOUH18LUAS1
• 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
- (04-35) -
AB: 141.8°F (61°C)
BC: 140.0°F (60°C)
CD: 138.2°F (59°C)
DE: 129.2°F (54°C)
Operation
AB: 141.8°F (61°C)
BC: 131.0°F (55°C)
CD: 127.4°F (53°C)
DE: 122.0°F (50°C)
Operation
-30 rps/30 sec.
-5 rps/60 sec.
-25 rps/120 sec.
-3 rps/60 sec.
8. Various protections