Water Pump; Pump Down Operation; Flow Switch - Panasonic WH-MDC09C3E8 Service Manual
Monobloc air-to-water heatpump system
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Also See for WH-MDC09C3E8:
- Service manual (139 pages) ,
- Operating instructions manual (92 pages) ,
- Design handbook (132 pages)
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12.2
Water Pump
12.2.1 Water Pump Control
1
Once the Monobloc unit is ON, the water pump will be ON immediately and no error judgement for 9 minutes.
However, during this 9 minutes operation, if there is any abnormality cause at Monobloc unit or malfunction,
the compressor should be OFF immediately and restart delay after 3 minutes.
2
The system will start checking on the water flow level after operation start for 9 minutes. If water flow level is
detected low continuously for 1 minute, the water pump and compressor will be OFF permanently and
OFF/ON Remote control LED will blink (H62 error occurs).
3
The water pump will remain ON when compressor OFF due to thermostat OFF.
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 Monobloc unit.
1
Make sure the OFF/ON remote control LED is OFF (no operation).
2
Press the Pump Down button to start the pump down operation.
3
No low pressure protection error during pump down operation and 3-way valve will be shift to heating side.
4
Press OFF/ON button to stop the pump down operation.
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.
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