Panasonic WH-SDC12F6E5 Service Manual page 62

13.1.5 Tank Mode Operation
Control contents:

3 ways valve direction
3 ways valve switch to tank side during Tank Thermo ON condition. Switch 3 ways valve to room side when
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tank achieve Tank Thermo OFF temperature and SOLAR turn ON condition.

Heat Pump Thermostat characteristic
Water set temperature = Tank set temperature or [50°C] whichever lower.
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Heat pump Water Outlet set temperature is set to [53°C] at tank mode.
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
Tank Thermo ON/OFF characteristic
THERMO OFF TEMP:
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1. THERMO OFF TEMP = Tank water set temperature + [0°C].
2. Tank temperature > THERMO OFF TEMP for continuous 10 seconds after heat pump OFF, water pump
OFF or
3. Tank temperature > Tank set temperature + [2°C] for continuously 20 seconds.
THERMO ON TEMP:
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1. THERMO ON TEMP = Tank water set temperature + [-2°C].
When detect tank temperature < THERMO ON TEMP, water pump ON for 3 minutes then heat pump ON.
Characteristic of heat pump thermo ON/OFF under Tank Mode condition:

Water Outlet Thermo Condition
Heat pump THERMO OFF TEMP:
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1. Heat pump THERMO OFF TEMP = 53°C + [+4°C].
2. Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 3 minutes, heat pump OFF.
Heat pump THERMO ON TEMP:
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1. Heat pump THERMO ON TEMP = Water inlet during thermo OFF time + [-3°C].
2. Heat pump ON back when water outlet temperature < Heat pump THERMO ON TEMP.

Water Inlet Thermo Condition
Heat pump THERMO OFF TEMP:
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1. Water inlet temperature > 55°C for continuous 60 seconds, heat pump OFF.
Heat pump THERMO ON TEMP:
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1. Heat pump THERMO ON TEMP = Water inlet temperature < 55°C.

Booster heater control
Booster heater turns ON and OFF follow normal operation.
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Booster heater turns ON condition:
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1. During start up time (initialization), Booster heater turns ON after DELAY TIMER.
2. When tank temperature lower than HEATER ON TEMP.
3. 20 minutes from previous heater OFF.
Booster heater turns OFF CONDITION:
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1. When tank temperature higher than tank set temperature for continuous 15 seconds.

Solar 3-way valve
Solar pump operates follow solar operation specification.
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
2 way valve closes

Other
Indoor backup heater cannot be ON during tank mode only.
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