Panasonic WH-MXF09D3E8 Service Manual page 48

2. Heat pump operation control:
•
During heating heat-up interval
Follow normal heating operation.
o
Under solar priority set condition:
Switch to tank heat-up interval and start counting tank heat-up timer when External Room
Thermo OFF AND solar 3WV OFF AND Tank temperature < THERMO ON TEMP (End Room
Interval Early) OR
Switch to tank heat-up interval and start counting tank heat-up timer when tank temperature <
THERMO ON TEMP AND solar 3WV OFF after room heat-up timer complete
Under solar priority not set condition:
Switch to tank heat-up interval and start counting tank heat-up timer when External Room
Thermo OFF AND Tank temperature < THERMO ON TEMP (End Room Interval Early) OR
Switch to tank heat-up interval and start counting tank heat-up timer when tank temperature <
THERMO ON TEMP after room heat-up timer complete
* THERMO ON TEMP is defined form following Case1 to Case4.
•
During tank heat-up interval
Heat pump tank target temperature = Tank set temperature or [55°C] whichever lower
o
Heat Pump Water Outlet set temperature is set to Maximum [53°C] during tank interval
o
Initial Tank THERMO ON TEMP = heat pump tank target temperature + [-3°C].
o
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 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.
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