Panasonic WH-MDC09C3E8 Service Manual page 54

Case 2:
Heatpump THERMO OFF TEMP:
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1. Heatpump THERMO OFF TEMP = 55°C + [+2°C].
2. Water outlet temperature > Heatpump THERMO OFF TEMP for continuous 90 seconds, switch
3 ways valve to room side. End Tank heat-up interval and start count heating heat-up interval.
THERMO ON TEMP:
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1. THERMO ON TEMP = Tank temp. when heatpump thermo off + [-3°C].
2. After Heating heat-up interval, always detect tank temperature. Switch to next tank heat-up interval
when tank temperature < THERMO ON TEMP
Case 3:
Heatpump THERMO OFF TEMP:
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1. Water inlet temperature > 52°C for continuous 60 seconds, switch 3 ways valve to room side. End
tank heat-up interval and start count heating heat-up interval.
THERMO ON TEMP:
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1. THERMO ON TEMP = Tank temp. when heatpump thermo off + [-3°C].
2. After Heating heat-up interval, always detect tank temperature. Switch to next tank heat-up interval
when tank temperature < THERMO ON TEMP
Case 4: (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 ON TEMP:
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1. THERMO ON TEMP = Heatpump tank target temperature + [-3°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.
3 Backup heater control:
a. During heating heat up interval.
Follow normal backup heater control operation.
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b. During tank heat-up interval.
Backup heater OFF during this interval.
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4 Booster heater control:
a. During heating heat-up interval.
Booster heater ON/OFF according to booster heater operation control.
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b. During tank heat-up interval.
Once switch from heating heat-up interval to tank heat-up interval, turn off the booster heater and start
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counting the BOOSTER HEATER DELAY TIMER.
Booster heater turn ON after BOOSTER HEATER DELAY TIMER fufil and tank temperature lower
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than tank set temperature.
BOOSTER HEATER DELAY TIMER is clear when switch to heating heat-up interval.
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5 Solar 3 way valve:
Solar 3WV operates follow solar operation specification.
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* 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 ways valve control:
2 ways valve opens.
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