Panasonic WH-SXC09D3E5 Service Manual page 46

12.1.7. Heat + Tank Mode Operation
Setting 1:- When Heating priority is set by control panel:
1. 3 ways valve control:
• 3 ways valve switch to room side during External Room Thermo ON OR Solar 3ways valve ON OR Tank Thermo OFF time,
and switch to tank side at External Room Thermo OFF AND Solar 3 ways valve OFF
2. Heat pump operation control:-
• During External Room Thermo ON time: (When room thermo ON, heat pump must operate to room side)
- Heat pump operate follow normal operation at room side
• During External Room Thermo OFF time:
a. Switch 3 ways valve to tank side, IF
Under Solar Priority Set condition:
- Tank temperature < Tank THERMO ON TEMP AND Solar Valve OFF
Under Solar Priority Not Set condition:
- Tank temperature < Tank THERMO ON TEMP
b. Switch back 3 ways valve to room side, Heat pump and water pump turn OFF, IF
- External Room Thermo ON back OR
Under Solar Priority Set condition:
- Tank temperature > Tank THERMO OFF TEMP. for continuous 3 minutes OR Solar Valve ON
Under Solar Priority Not Set condition:
- 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:
- Heat pump tank target temperature = tank set temperature or [55 C] whichever lower
- Heat Pump Water Outlet set temperature is set to [53 C] during tank interval
- Initial Tank THERMO ON TEMP = heat pump tank target temperature + [-3 C]
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.
• Next THERMO ON TEMP:
1. THERMO ON TEMP = Heat pump tank target temperature + [-3 C].
2. If tank temperature < THERMO ON TEMP AND External Room Thermo OFF, switch to tank side.
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 3 minutes, switch 3 ways valve to room
side.
• Next THERMO ON TEMP:
1. THERMO ON TEMP = Tank temp. when heat pump thermo off + [-3 C].
2. If tank temperature < THERMO ON TEMP AND External Room Thermo OFF, switch to tank side.
Case 3:
• Heat pump THERMO OFF TEMP:
1. Water inlet temperature > 55 C for continuous 60 secs, switch 3 ways valve to room side.
• Next THERMO ON TEMP:
1. THERMO ON TEMP = Tank temp. when heat pump thermo off + [-3 C].
2. If tank temperature < THERMO ON TEMP AND External Room Thermo OFF, switch to tank side.
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