Fujitsu ACUH09LUAS1, Service Manual

Page: 141 / 153

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 Indoor unit heat exchanger
temperature drops
Stable zone
AB
BC
CD
DE
Zone A
Zone B
Zone C
Zone D
Zone E
AB: 141.8°F (61°C)
BC: 140.0°F (60°C)
CD: 138.2°F (59°C)
DE: 129.2°F (54°C)
Zone Operation
Zone A Compressor is stopped.
Zone B
The compressor frequency is decreased.
-30 rps/30 sec.
Zone C -5 rps/60 sec.
Zone D
The protection is released and the operation is returned to normal mode.
Zone E
• Heating mode
Indoor unit heat exchanger
temperature rises Indoor unit heat exchanger
temperature drops
Stable zone
AB
BC
CD
DE
Zone A
Zone B
Zone C
Zone D
Zone E
AB: 141.8°F (61°C)
BC: 131.0°F (55°C)
CD: 127.4°F (53°C)
DE: 122.0°F (50°C)
Zone Operation
Zone A Compressor is stopped.
Zone B
The compressor frequency is decreased.
-25 rps/120 sec.
Zone C -3 rps/60 sec.
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
- (04-35) -
8. Various protections
C
O
N
TR
O
L
A
N
D
FU
N
C
TI
O
N
S
C
O
N
TR
O
L
A
N
D
FU
N
C
TI
O
N
S