Panasonic WH-MXC09J3E8 Service Manual page 98

During Tank heat-up interval
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
Tank interval is the first mode running when heat + tank mode is select.

Switch to room interval only when tank achieve tank thermo OFF OR tank heat-up interval timer is
complete.

Heat pump operates according to normal tank mode operation.
3 Room heater control:
During heating heat-up interval
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
Follow normal room heater control operation.
4 Tank heater control:
During heating heat-up interval
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
If External tank heater is select.

External heater ON/OFF according to external tank heater operation control.

If internal tank heater is select.

Internal tank heater will not function under heating heat-up interval.
During tank heat-up interval
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
If External tank heater is select.

Once heating heat-up interval switched to tank heat-up interval, tank heater is turn OFF and tank
heater delay timer will start counting.

Tank heater will turn ON after tank heater delay timer is fulfill and tank temperature is lower than
tank set temperature.

Tank heater delay timer is clear when switching to heating heat-up interval.

If internal tank heater is select.

Internal tank heater will turn ON after heat punp thermo off to boil tank temperature to tank set
temperature.
2 ways valve control is open
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Indoor water pump control:
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
Indoor water pump always turn ON if room heat pump thermo ON OR Tank thermo ON.
13.1.11 Cool + Tank Mode Operation
1 3 ways valve control:
3 ways valve switch to room side during room cooling interval and switch to tank side during tank heat-up
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interval. Both mode will switch alternately. Tank mode is the initial mode of cool + tank mode.
2 Heat pump operation control:
During room heat-up interval
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
Follow normal cooling operation.
Switching to tank side depends to below cases:
Case 1:
[Previous switch from tank interval to room interval due to thermo OFF]

Switch to tank heat-up interval when Tank temperature < Tank Thermo ON temperature (Room
interval will ends)
Case 2:
[If cooling operation at room side is less than 30 minutes and switch to tank side for 3 times
consecutively]

Maintain at room cooling interval regardless of the tank temperature. Switch to tank heat-up interval
only when (Room Interval Timer is complete OR Room heat pump thermo OFF) AND Tank
temperature < Tank thermo ON temperature.
Case 3:
[Previous switch from tank interval to room interval is due to tank interval timer is complete]

Maintain at room cooling interval regardless of the tank temperature. Switch to tank heat-up interval
only when (Room Interval Timer is complete OR Room heat pump thermo OFF) AND tank
temperature < Tank thermo ON temperature.
*Tank Thermo ON temperature:
Internal Tank Heater select USE <Tank set temperature + R/C setting (Tank re-heat temperature)
Others <Tank water set temperature + R/C setting (Tank re-heat temperature)
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