Panasonic WH-SXC09D3E5 Service Manual page 47

Case 4 (Only during solar priority is set condition):
• When solar request ON, solar valve will ON and switch 3 ways valve to room side
• 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 AND Solar 3WV OFF, switch to tank
side.
3. Backup Heater control:-
a. During External Room Thermo ON time, follow normal backup heater control operation
b. During External Room Thermo OFF time, Backup heater OFF
4. Booster heater control:
• Booster heater On/Off follow normal operation.
* Under solar priority is set condition, when solar 3 way valve is ON, booster heater turn OFF.
5. Solar 3 way valve:
• Solar 3 way valve operates follow solar operation specification.
* Under solar priority is set condition, when solar 3WV turn ON, booster heater will turn OFF and 3 ways valve switch to room
side.
* Under solar priority is not set condition, solar 3WV will OFF when heat pump operate to tank side.
6. 2 ways valve control:
• 2 ways valve opens.
Heat + Tank Mode (Heating priority set)
Under Solar Priority Set Condition:
47