Panasonic WH-MHF12G9E8 Service Manual page 54

Setting 2: When heating priority is not set by control panel:

When Solar Priority is set/not set by control panel:
1. 3 ways valve control:
3 ways valve switch to room side during heating heat-up interval, and switch to tank side during tank
o
heat-up interval. Both modes will switch alternatively. Tank mode is the Initial running mode of this heat
+ tank mode (heating no priority).
2. Heat pump operation control:
During heating heat-up interval
o
 Follow normal heating operation
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.
Under solar priority not set condition:
 Switch to tank heat interval and start counting tank heat-up timer when External Room Thermo
OFF AND Tank < THERMO ON TEMP (End Room Interval) OR
 Switch to tank heat-up interval and start counting tank heat-up timer when tank temperature <
THERMO ON TEMP.
* THERMO ON TEMP is defined Tank thermo ON/OFF condition below.
During tank heat-up interval
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 Heat pump tank target temperature = Tank set temperature or [60°C] whichever lower.
 Heat pump Water Outlet set temperature is set to [63°C] during tank interval.
 Initial Tank THERMO ON TEMP = heat pump tank target temperature + [-8°C].
Tank thermo ON/OFF characteristic:
THERMO OFF TEMP:
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1. THERMO OFF TEMP = Heat pump tank target temperature + [0°C].
2. Tank temperature > THERMO OFF TEMP for continuous 10 seconds after heat pump off due
to water thermo, switch 3 ways valve to room side. End Tank heat-up interval and start count
heating heat-up interval.
3. Tank temperature > Tank set temperature + [2°C] for continuous 10 seconds, switch 3 way
valve to room side. End Tank heat up interval and start count heating up interval.
THERMO ON TEMP:
o
1. THERMO ON TEMP = Heat pump tank target temperature + [-8°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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