Solar Operation (Optional) - Panasonic WH-MDC09C3E8 Service Manual

Water pump turns OFF when ANY of the below conditions is fulfilled:
Outdoor ambient temp. ≥ 4°C
o
During -5°C < outdoor ambient temp. < 4°C
o
During outdoor ambient temp. < -5°C
o
However, if flow switch is abnormal (H62), then water pump circulation anti freeze control will not activate.
2. Backup heater anti freeze control:
Backup heater turns ON when ALL the below conditions are fulfilled:
Water inlet/outlet temp. < 6°C
o
Water pump circulation anti freeze control activated, and water pump ON for 4 minutes
o
Backup heater turns OFF when ANY of the below conditions is fulfilled:
Water inlet/outlet temp. > 28°C
o
Water pump circulation anti freeze control deactivated/water pump OFF
o
However, if backup heater is abnormal (H70), then backup heater anti freeze control will not activate.

12.16 Solar Operation (Optional)

12.16.1 Solar Operation
1 Control according to preset whether solar priority is set or not.
2 When tank connection is NOT set at SETTING mode, solar operation is disabled.
3 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).
12.16.2 Solar Operation Control
When solar priority is SET
1 Operation condition:
Solar pump operates if all of the following conditions are fulfilled:
o
i) Power On. (regardless operation ON or OFF)
ii) There is operation request from solar pump station.
iii) Tank hot water temp is below solar on upper limit temp [EEPROM 1 : 70]°C.
2 Stop condition:
Solar pump stops operating when:
o
i) No power supply to unit OR
ii) There is NO operation request from solar pump station OR
iii) Tank hot water temp is above solar off upper limit temp [EEPROM 2 : 77]°C.
* heatpump 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.
After water pump ON for 4 minutes, and water inlet/outlet temp. ≥ 8°C
Else, shift to backup heater anti freeze control
After water pump ON for 4 minutes, and water inlet/outlet temp. ≥ 20°C
Else, shift to backup heater anti freeze control
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