Fujitsu ABHG18KRTA, Service Manual

Page: 402 / 471

8-8. High temperature and high pressure release control
The compressor is controlled as follows.
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Models: AOHG30KBTA4 and AOHG36KBTA5
• 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: 61°C
BC: 60°C
CD: 59°C
DE: 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: 61°C
BC: 55°C
CD: 53°C
DE: 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
8-8. High temperature and high pressure release control
- (04-82) -
8. Various protections
CONTROL AND FUNCTIONS CONTROL AND FUNCTIONS