Panasonic WH-MXC16G9E8 Service Manual page 51

Characteristic of heat pump thermo ON/OFF under tank side condition
Water Outlet Thermo condition
Heat pump THERMO OFF TEMP:
o
1. Heat pump THERMO OFF TEMP = 53°C + [+4°C]
2. Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 90 seconds, heat pump
OFF but water pump continue ON.
THERMO ON TEMP:
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1. THERMO ON TEMP = Water inlet temperature, when heat pump thermo OFF + [-3°C].
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.
THERMO ON TEMP:
o
1. THERMO ON TEMP = Water inlet temperature < [55°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.
THERMO IN TEMP:
o
1. THERMO ON TEMP = Heat pump tank target temperature + [-2°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.
Tank interval will end and start heating interval timer, IF
o
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:
During heating heat-up interval.
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 Follow normal back up heater control operation.
During tank heat-up interval.
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 Back up heater OFF during this interval.
4. Booster heater control:
During heating heat up interval.
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 Booster heater ON/OFF according to booster heater operation control.
During tank heat-up interval.
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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
Solar 3WV operates follow solar operates specification.
o
* 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.
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