Cooper & Hunter FG20/C-M, Service Manual

Page: 22 / 91

COMMERCIAL AIR CONDITIONER DUCT TYPE SPLIT AIR CONDITIONER
19
When T
ambient
≥ T
setting
＋
2 , the unit starts cooling. In that case, the compressor, the outdoor
℃
fan and the indoor fan will run. The outdoor fan will run for 15s before the compressor runs.
When T
setting
－
2 < T
℃
ambient
< T
setting
＋
2 , the compress
℃
or and the outdoor fan will repeat
running for 6min and stopping for 4min, while the indoor fan will run.
When T
ambient
≤ T
setting
—2 , the compressor, the outdoor fan will stop running. The outdoor ℃
fan will stop after the compressor stops for 15s.
2.2.2 Dual System
When T
ambient
≥ T
setting
＋
2 , the unit starts cooling. The indoor fan will run at low speed.
℃
The outdoor fan A will run for 15s before the compressor runs. After the compressor A runs for
15s, the outdoor fan B will run. The compressor B will run 15s later.
During running, the unit will run according to the following situation for 6-min interval:
When T
setting
－ 2 < T ℃
ambient
< T
setting
＋ 2 , the compressor A and the outdoor fan A will ℃
repeat running for 6min and stopping for 4min, while the compressor will remain the previous
running state.
When T
ambient
≤ T
setting
－ 2 , the compressor A will stop. The outdoor fan A will stop 15s ℃
later. It will detect the temperature 6min later. When T
ambient
≤ T
setting
－
2 , the compressor B will
℃
stop. The outdoor fan B will stop 15s later.
2.3 Heating Mode
heating mode
compressor
outdoor fan
indoor fan
way
valve
OFF
ON
OFF
ON
OFF
OFF
turn on the
unit
time
OFF
OFF
turn off the
unit manually
ON
ON
anti-cold
air
OFF OFF
OFF
OFF
ON meet the
running
condition
auxiliary
heator
When T
ambient
–T
supplement
≤ T
setting
-1 , the unit stars heating. The selector valve, the ℃
outdoor fan and the compressor will be energized and start running, while the indoor fan will run
according to anti-cold air. The outdoor fan will run for 1s before the compressor runs. The 4-way
valve will work 20s later.
When T
ambient
- T
supplement
＝
T
setting
, the compressor, the selector valve and the outdoor fan
will remain the previous running state and the indoor fan will run.