Solar Operation (Optional) - Panasonic WH-MHF12G9E8 Service Manual

12.14 Solar Operation (Optional)

12.14.1 Solar Operation:
1 External solar heat source signal can be connect to unit for proper control of heat source switching during
tank boiling time.
2 Control according to preset whether solar priority is set or not.
3 When tank connection is NOT set at SETTING mode, solar operation is disabled.
4 When Pump A (from solar pump station) is detected On through connection Y3 and Y4, then the Solar pump
3 Way Valve is requested ON (Refer to figure below).
12.14.2 Solar Operation Control
When solar priority is SET
1 Operation condition:
a 3 way valve operates if all of the following conditions are fulfilled:

Power On. (regardless operation ON or OFF)

There is operation request from solar pump station.

Tank hot water temp is below solar on upper limit temp 72°C.
2 Stop condition:
a 3 way valve stops operating when:

No power supply to unit OR

There is NO operation request from solar pump station OR

Tank hot water temp is above solar off upper limit temp 80°C.
* heat pump OFF OR operate to room side when solar pump operate during solar priority set.
* booster heater OFF when solar pump operate during solar priority set.
When solar priority is NOT SET
1 Operation condition:
a 3 way valve operates if all of the following conditions are fulfilled:

Power On. (regardless operation ON or OFF)

There is operation request from solar pump station.

Tank hot water temp is below solar on upper limit temp 72°C.

Heat pump thermo OFF in tank mode OR Heat pump operate to room side
(during operation ON and tank mode selected).
2 Stop condition:
a 3 way valve stops operating when:

No power supply to unit OR

There is NO operation request from solar pump station OR

Tank hot water temp is above solar off upper limit temp 80°C.

Heat pump thermo ON and operate to tank side. (during operation ON and tank mode selected)
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Solar pump 3 Way
Valve