Panasonic WH-SXF12D6E5 Service Manual page 47

Case 4 (Only during solar priority is set condition):
• When solar pump ON, tank heat-up interval end early and 3 ways valve switch to room side.
• 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 and solar 3 way valve OFF.
• Tank interval will end and start heating interval timer, IF
1. Tank interval timer finish AND External Room Thermo ON OR
2. Fulfill above 4 case of thermo off condition.
3. Backup heater control:
a. During heating heat up interval
• Follow normal backup heater control operation
b. During tank heat-up interval
• Backup heater OFF during this interval
4. Booster heater control:
a. During heating heat-up interval.
• Booster heater ON/OFF according to booster heater operation control
b. During tank heat-up interval.
• Once switch from heating heat-up interval to tank heat-up interval, turn off the booster heater and start counting the
BOOSTER HEATER DELAY TIMER.
• Booster heater turn ON after BOOSTER HEATER DELAY TIMER fufill and tank temperature lower than tank set
temperature.
• BOOSTER HEATER DELAY TIMER is clear when switch to heating heat-up interval.
5. Solar 3 way valve
• Solar 3WV operates follow solar operation specification.
* Under solar priority is set condition, when solar 3WV is ON, booster heater turn OFF
* Under solar priority is not set condition, solar 3WV only can ON during heating heat-up interval.
47