Water Pump - Panasonic WH-MXC09J3E8 Service Manual

13.2 Water Pump

13.2.1 Water Pump Control

Once the indoor unit is ON, the water pump will be ON immediately and no error judgment for 70 seconds.
However, during this 70 seconds 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 70 seconds. If water flow level is
detected low continuously 60 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 will OFF when room thermo OR tank thermo OR buffer tank thermo OFF.

Water pump will delay 15 seconds to turn OFF when request to OFF except during anti-freeze deice activate or
air purge mode.
Maximum pump speed setting on remote control

When Pump flowrate setting is ΔT
Standard pump speed is automatically controlled to get the designed water temperature different between water
inlet and outlet (ΔT). The maximum pump speed setting limitation can be adjusted by the installer according to
water circuit pressure drop condition.

When Pump flowrate setting is Max. Duty
Indoor water pump speed will operate at the maximum pump speed setting at room side operation. The
maximum pump speed setting can be adjusted by the installer according to water circuit pressure drop condition.
However, the following sequences do not follow maximum pump duty setting by remote control.

Pump down mode

Air purge mode

Normal deice
Pump ON Request
ON Water Pump
Pump ON Time
NO
Water Flowrate Abnormal
OFF Water Pump
YES
NO
≥ 70 Sec?
YES
> 60 Sec?
YES
H62 Error Display
at Remote Controller
100