Panasonic WH-MHF09G3E8, Service Manual

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Characteristic of heat pump thermo ON/OFF under tank side condition
Water Outlet Thermo condition
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Heat pump THERMO OFF TEMP:
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 but water pump continue ON.
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THERMO ON TEMP:
1. THERMO ON TEMP = Water inlet temperature, when heat pump thermo OFF + [-3°C].
Water Inlet Thermo condition
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Heat pump THERMO OFF TEMP:
1. Water inlet temperature > [65°C] for continuous 60 seconds, heat pump OFF.
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THERMO ON TEMP:
1. THERMO ON TEMP = Water inlet temperature < [65°C]
Solar Operation Condition (Only during solar priority is set condition)

When solar pump ON, tank heat-up interval end early and 3 ways valve switch to room side.
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THERMO IN TEMP:
1. THERMO ON TEMP = Heat pump tank target tempe [-8°C].
2. After heating heat-up interval, always detect tank temperature. Switch to next tank heat-up interval when
tank temperature < THERMO ON TEMP and solar 3 way valve OFF.
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Tank interval will end and start heating interval timer, IF
1. Tank interval timer finish AND External Room Thermo ON OR
 Only when this condition occur at tank side before tank temperature thermo OFF switch to room side
compulsory and continue until complete room heat-up interval and switch back to tank side.
2. Fulfill Tank thermo OFF condition.
3. Backup heater control:
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During heating heat-up interval.

Follow normal back up heater control operation.
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During tank heat-up interval.
 Back up heater OFF during this interval.
4. Booster heater control:
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During heating heat up interval.
 Booster heater ON/OFF according to booster heater operation control.
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During tank heat-up interval.

Once switch from heating heat-up interval to tank heat-up interval, turn OFF the booster heater
and start counting the BOOSTER HEATER DEPLAY TIMER.
 Booster heater turn ON after BOOSTER HEATER DELAY TIMER fulfill and tank temperature
lower than tank set temperature.

BOOSTER HEATER DELAY TIMER is clear when switch to heating heat-up interval.
5. Solar 3 way valve
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Solar 3WV operates follow solar operates specification.
* Under solar priority is set condition, when solar 3WV is ON, booster heater turn OFF.
* Under solar priority is not set condition, solar 3WV only can ON during heating heat-up interval.
6. 2 way valve opens.