Philips WH-UD16CE5-A-1 Service Manual page 72

iii. Case 3
- Heat pump THERMO OFF TEMP:
1 Water inlet temperature > 55°C for continuous 60 secs, heat pump OFF.
- Heat pump THERMO ON TEMP:
1 Heat pump THERMO ON TEMP = Water inlet temperature < 55°C.

Booster heater control
- Booster heater turn On and Off follow normal operation.
- Booster heater turn ON condition:
1 During startup time (initialization), Booster heater turn ON after DELAY TIMER.
2 When tank temperature lower than HEATER ON TEMP
3 20 minutes from previous heater off.
- Booster heater turn OFF condition:
1 When tank temperature higher than tank set temperature for continuous 15 secs.

Solar 3 way valve
- Solar pump operates follow solar operation specification.

2 way valve closes

Others
- Indoor backup heater cannot be ON during tank mode only.
72