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17.2 Pump down
1. Standby Electrical Power without switch on
Operation.
2. Press (1sec) Pump Down Switch at outdoor
PCB.
3. Compressor start pump down. (Operate max
10min).
4. Close Liquid Valve.
5. Wait for refrigerant collection until low
pressure switch triggered, then countdown
timer (40sec) started with LED indication.
6. Close Gas Valve.
7. Compressor stop when 40sec countdown
timer completed.
8. LEDs will be OFF in sequence to indicate the
40sec timer countdown,
Compressor Stopped
LED OFF in sequence as indication of 40sec countdown
OFF
40sec
35 ~ 39sec
30 ~ 34sec
25 ~ 29sec
20 ~ 24sec
15 ~ 19sec
10 ~ 14sec
5 ~ 9sec
0 ~ 4sec
Timer Count
ON
ON
ON
ON
ON
ON
ON
ON
LED2
OFF
ON
ON
ON
ON
ON
ON
ON
OFF
LED3
OFF
ON
ON
ON
ON
ON
ON
OFF
OFF
LED4
OFF
ON
ON
ON
ON
ON
OFF
OFF
OFF
LED5
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
LED6
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
LED7
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
LED8
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
LED9
OFF
Outdoor Expansion
COMP
Outdoor Fan
4WayValve
Indoor Fan
Indoor Expansion
Stop
Stop
Stop
Normal
Control
Normal
Control
Fully Open
OFF
Hi Speed
Fully Open
Max 10 min
Pump down Operation Control
Max Speed
Stop
Stop
Stop
Normal
Control
Normal
Control
Stop
During Pump down Operation, below protection controls will be ignore or cancel :
1. Cooling low load control.
2. Dew prevention, freezing prevention control.
3. Gas by pass control at cooling low load.
4. Low pressure protection control.
5. Discharge temperature sensor abnormal.
6. Indoor unit freezing abnormal.
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