Panasonic WH-MXF09D3E5 Service Manual page 46

• During tank heat-up interval
- Heat pump tank target temperature = tank set temperature or [55°C] whichever lower
- Heat Pump Water Outlet set temperature is set to Maximum [53°C] during tank interval
i. Case 1
- THERMO OFF TEMP :
1. THERMO OFF TEMP = Heat pump tank target temperature + [+2°C].
2. Tank temperature > THERMO OFF TEMP for continuous 3 minutes, switch 3 ways valve to room side. End Tank heat-
up interval and start count heating heat-up interval.
- THERMO ON TEMP :
1. THERMO ON TEMP = Heat pump 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
ii. Case 2
- Heat pump THERMO OFF TEMP:
1. Heat pump THERMO OFF TEMP = 53°C + [+4°C].
2. Water outlet temperature > Heat pump 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:
1. THERMO ON TEMP = Tank temp. when heat pump 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
iii. Case 3
- Heat pump THERMO OFF TEMP:
1. Water inlet temperature > 55°C for continuous 60 sec, switch 3 ways valve to room side. End tank heat-up interval and
start count heating heat-up interval.
- THERMO ON TEMP:
1. THERMO ON TEMP = Tank temp. when heatump 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.
iv. 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.
- THERMO ON TEMP:
1. THERMO ON TEMP = Heat pump 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:-
• During heating heat up interval.
- Follow normal backup heater control operation.
• During tank heat-up interval.
- Backup heater OFF during this interval.
4. Booster heater control:
• During heating heat-up interval.
- Booster heater ON/OFF according to booster heater operation control.
• 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 DELAY TIMER.
- Booster heater turn ON after BOOSTER HEATER DELAY TIMER fufil 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 operation specification.
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