Water Pump - Panasonic WH-MHF09G3E5 Service Manual

12.1.7 Fan Motor Operation
Fan motor is adjusted according to operation condition. It starts when compressor starts operation and it stops
30 seconds after compressor stops operation.
Compressor:
Outdoor Fan:

12.2 Water Pump

12.2.1 Water Pump Control

Once the Mono Bloc 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 outdoor or malfunction, the
compressor should be OFF immediately and restart delay after 3 minutes.

The system will start checking on the water flow level after operation start for 9 minutes. If water flow level is
detected low continuously 10 seconds, the water pump and the compressor will be OFF permanently and
OFF/ON control panel LED will blink (H62 error occurs).

When error happens, the power has to be reset to clear the error.

If there is no error indication, the water pump shall be continuously running.

The water pump will remain ON when compressor OFF due to thermostat OFF setting is reached.

Water pump must always operate during heating mode, deice operation and also during heater ON condition.

Water pump will stops 15 seconds after the unit stops operation.
ON
OFF
Fan Speed
ON
30 sec
Water Pump Control
NO
t ≥ 9 min
YES
Flow
S/W
Status
YES
NO
OK
tc < 1min
NG
STOP Water pump
ERROR display at
Control Panel
57
ON
ON
OFF
ON Water pump
ERROR reset by
power reset