8-7. High pressure protection
Trigger condition
Pressure switch: Off (Open: Higher than 4.2 MPa)
Compressor stop
Release condition
Pressure switch: On (Close: Lower than 3.2 MPa)
(3 minutes after compressor stop)
Compressor restart
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
Cooling/Dry
Trigger condition
-20°C
Release condition
-15°C
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
Indoor unit heat exchanger
pressure drops
Stable zone
AB
BC
CD
DE
Zone A
Zone B
Zone C
Zone D
Zone E
AB:
4.1 MPaG
BC:
3.5 MPaG
CD:
3.3 MPaG
DE:
3.0 MPaG
Zone
Operation
Zone A
Compressor is stopped.
Zone B
The compressor frequency is decreased.
-10 rps/120 sec.
Zone C
-2 rps/120 sec.
Zone D
The protection is released and the operation is returned to normal mode.
Zone E
8-7. High pressure protection
- (01-38) -
8. Various protections
CONTROL AND
FUNCTIONS
CONTROL AND
FUNCTIONS
