Panasonic WH-MHF09G3E5 Service Manual page 50

Tank Thermo ON/OFF Characteristic
THERMO OFF TEMP:
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1. THERMO OFF TEMP = Heat pump tank target temperature + [0°C].
2. Tank temperature > THERMO OFF TEMP for continuous 10 seconds after heat pump OFF due to water
thermo, switch 3 ways valve to room side OR
3. Tank temperature > Tank set temperature + 2°C for continuous 10 seconds, switch 3 ways valve to room
side.
Next THERMO ON TEMP:
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1. THERMO ON TEMP = Heat pump tank target temperature + [2°C] or
2. If tank temperature < THERMO ON TEMP AND External Room Thermo OFF, switch to tank side.
Characteristic of heat pump thermo ON/OFF under tank side condition
Water Outlet Thermo condition
Heat pump THERMO OFF TEMP:
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1. Heat pump THERMO OFF TEMP = 63°C + [+4°C].
2. Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 90 seconds, heat pump OFF
and water pump continue ON.
Next THERMO ON TEMP:
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1. THERMO ON TEMP = Water inlet when heat pump THERMO OFF + [-3°C].
2. If water outlet temperature < THERMO ON TEMP AND External Room Thermo OFF, heat pump ON.
Water Inlet Thermo condition
Heat pump THERMO OFF TEMP
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1. Water inlet temperature > [65°C] for continuous 30 seconds, heat pump OFF, water pump continue ON.
Next THERMO ON TEMP:
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1. THERMO ON TEMP = Water inlet temperature <65°C.
2. If water inlet temperature < THERMO ON TEMP AND External Room Thermo OFF, heat pump ON.
Solar Operation Condition (Only during solar priority is set condition)
When solar request ON, solar valve will ON, turn OFF heat pump and water pump and switch 3 ways valve to
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room side.
THERMO ON TEMP:
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1. THERMO ON TEMP = Heat pump tank target temperature + [-8°C].
2. If tank temperature < THERMO ON TEMP AND External Room Thermo OFF AND Solar 3WV OFF, switch
to tank side. Turn ON heat pump after water pump turns ON for 3 minutes.
3. Backup heater control:-
During External Room Thermo ON time, follow normal backup heater control operation.
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During External Room Thermo OFF time, Backup heater OFF.
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4. Booster heater control:-
Booster heater ON/OFF follow normal operation.
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* Under solar priority is set condition, when solar 3 way valve is ON, booster heater turn OFF.
5. Solar 3 way valve:
Solar 3 way valve operates follow solar operation specification.
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* Under solar priority is set condition, when solar 3WV turns ON, booster heater will turns OFF and 3 ways
valve switch to room side.
* Under solar priority is not set condition, solar 3WV will OFF when heat pump operate to tank side.
2 way valve open.
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