Panasonic WH-SXC09D3E5 Service Manual page 49

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. End Tank
heat-up interval and start count heating heat-up interval.
• 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.
Case 2:
• Heat pump THERMO OFF TEMP:
1. Heat pump THERMO OFF TEMP = 53 C + [+4 C].
a. Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 90 seconds, switch 3 ways valve to room
side. End Tank heat-up interval and start count heating heat-up interval.
• THERMO ON TEMP:
1. THERMO ON TEMP = Tank temp. when heat pump thermo off + [-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.
Case 3:
• Heat pump THERMO OFF TEMP:
1. Water inlet temperature > 55 C for continuous 60 secs, switch 3 ways valve to room side. End tank heat-up interval
and start count heating heat-up interval.
• THERMO ON TEMP:
1. THERMO ON TEMP = Tank temp. when heat pump thermo off + [-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.
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.
49