High Pressure Protection - Fujitsu AO G36KBTB Series Service Instruction

8-7. High pressure protection

Trigger condition
Release condition
8-8. Low outdoor temperature protection
When the outdoor temperature sensor detects lower than the trigger condition below, the compres-
sor is stopped.
Operation mode
Trigger condition
Release condition
8-9. High temperature and high pressure release control
The compressor is controlled as follows.
¢ Models: AOHG36KBTB, AOHG45KBTB, and AOHG54KBTB
• Heating mode
Indoor unit heat exchanger
pressure rises
Zone A
AB
Zone B
BC
Zone C
CD
Zone D
Zone E
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 pressure protection
Indoor unit heat exchanger
pressure drops
Stable zone
DE
- (01-38) -
Pressure switch: Off (Open: Higher than 4.2 MPa)
Compressor stop
Pressure switch: On (Close: Lower than 3.2 MPa)
(3 minutes after compressor stop)
Compressor restart
Cooling/Dry
-20°C
-15°C
AB: 4.1 MPaG
BC: 3.5 MPaG
CD: 3.3 MPaG
DE: 3.0 MPaG
Operation
-10 rps/120 sec.
-2 rps/120 sec.
8. Various protections