Panasonic WH-MDF12C6E5, Service Manual

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44
Switch back 3 ways valve to room side, Heat pump and water pump turn OFF, IF
o
External Room Thermo ON back OR
Under Solar Priority Set condition:
ƒ Tank temperature > Tank THERMO OFF TEMP. for continuous 3 minutes OR Solar Valve
ON
Under Solar Priority Not Set condition:
ƒ Tank temperature > Tank THERMO OFF TEMP for continuous 3 minutes
* THERMO ON and THERMO OFF point refer to case below.
Operation condition when 3 ways valve switch to tank side:
ƒ Tank water set temperature = tank set temperature or [50 ° C] whichever lower
ƒ Heat Pump Water Outlet set temperature is set to [53 ° C] during tank interval
ƒ Initial Tank THERMO ON TEMP = heat pump tank target tempe [-1°C]
Case 1:
o
THERMO OFF TEMP:
1.
THERMO OFF TEMP = Tank water set tempe [1 ° C] .
2.
Tank temperature > THERMO OFF TEMP for continuous 10 seconds after compressor off, switch
3 ways valve to room side.
o
Next THERMO ON TEMP:
1.
THERMO ON TEMP = Heat pump tank target tempe [-1 ° C] or
2.
If tank temperature < THERMO ON TEMP AND External Room Thermo OFF, switch to tank side.
Case 2:
o
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 3 minutes, heat pump
OFF.
o
Next THERMO ON TEMP:
1.
THERMO ON TEMP = Water inlet when heat pump THERMO OFF + [-3 ° C] .
2.
If water outlet temperature < THERMO ON TEMP AND External Room Thermo OFF, heat pump ON.
Case 3:
o
Heat pump THERMO OFF TEMP:
1.
Water inlet temperature > 55°C for continuous 60 secs, heat pump OFF.
o
Next THERMO ON TEMP:
1.
THERMO ON TEMP = Water inlet temperature < 55°C.
2.
If water inlet temperature < THERMO ON TEMP AND External Room Thermo OFF, heat pump ON.
Case 4: (Only during solar priority is set condition)
o
When solar request ON, solar valve will ON and switch 3 ways valve to room side
o
THERMO ON TEMP:
1.
THERMO ON TEMP = Heat pump tank target tempe [-1 ° C] .
2.
If tank temperature < THERMO ON TEMP AND External Room Thermo OFF AND Solar 3WV OFF,
switch to tank side.
3 Backup Heater control:-
o
During External Room Thermo ON time, follow normal backup heater control operation
o
During External Room Thermo OFF time, Backup heater OFF
4 Booster heater control:
o
Booster heater On/Off follow normal operation.
* Under solar priority is set condition, when solar 3 way valve is ON, booster heater turn OFF.