Panasonic WH-MDC09C3E8 Service Manual page 53

12.1.7 Heat + Tank Mode Operation
Setting 1: When Heating priority is set by control panel:
1 3 ways valve control:
3 ways valve switch and fix to room side.
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2 Heatpump operation control:
Heatpump operate follow normal operation.
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3 Backup Heater control:
Backup heater operate follow normal operation.
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4 Booster heater control:
Booster heater On/Off follow normal operation.
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5 Solar 3 way valve:
Solar 3 way valve operates follow solar operation specification.
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6 2 ways valve control:
2 ways valve opens.
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* Under solar priority is set condition, when solar 3 way valve is ON, booster heater turn OFF.
Setting 2: When heating priority is not set by control panel:

When Solar Priority is set/not set by control panel:
1 3 ways valve control:
3 ways valve switch to room side during heating heat-up interval, and switch to tank side during tank
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heat-up interval. Both mode will switch alternatively.
2 Heatpump operation control:
a. During heating heat-up interval
 Follow normal heating operation.
Under solar priority set condition:
- Always detect the tank temperature after heating heat-up interval. Switch only to tank heat-up
interval and start counting tank heat-up timer when tank temperature < THERMO ON TEMP AND
solar 3WV OFF
Under solar priority not set condition:
- Always detect the tank temperature after heating heat-up interval. Switch only to tank heat-up
interval and start counting tank heat-up timer when tank temperature < THERMO ON TEMP
* THERMO ON TEMP is defined form following Case1 to Case4.
b. During tank heat-up interval
 Heatpump tank target temperature = tank set temperature or [55°C] whichever lower
 Heatpump Water Outlet set temperature is set to Maximum [55°C] during tank interval
Case 1:
THERMO OFF TEMP:
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1. THERMO OFF TEMP = Heatpump tank target temperature + [+2°C].
2. Tank temperature > THERMO OFF TEMP for continuous 3 minutes, switch 3 ways valve to room side.
End Tank heat-up interval and start count heating heat-up interval.
THERMO ON TEMP:
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1. THERMO ON TEMP = Heatpump tank target temperature + [-3°C].
2. After Heating heat-up interval, always detect tank temperature. Switch to next tank heat-up interval
when tank temperature < THERMO ON TEMP
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