Panasonic WH-UD28AE, Service Manual

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12.3. Pump Down Operation
Purpose
Ensure the pump down operation when relocating or disposing of the unit. The pump down operation will extract all
refrigerant from the piping into the outdoor unit.
1. Press the pump down operation button to begin forced cooling operation.
2. There will be no Low Pressure error judgement during pumpdown operation.
3. Press the ON/OFF button to stop the unit.
12.4. Flow Switch
12.4.1. Flow Switch Control
1. The Water flow switch serve as an overload protector that shuts down the unit when the water level is detected to be low.
2. Detection is Lo (0V) when there is no water flow, and detection is Hi (5V) when there is water flow.
12.5. Auto Restart Control
1. When the power supply is cut off during the operation of Air-to-Water Heatpump, the compressor will re-operate within three
to four minutes (there are 10 patterns between 2 minutes 58 seconds and 3 minutes 52 seconds to be selected randomly)
after power supply resumes.
12.6. Indication Panel
Note:
• If Operation LED is blinking, there is an abnormality operation occurs.
LED Operation
Color Green
Light ON Operation ON
Light OFF Operation OFF