Philips WH-UD16CE5-A-1 Service Manual page 75

 Switch back 3 ways valve to room side, Heat pump and water pump turn OFF, IF
External Room Thermo ON back OR
o
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:
 Tank water set temperature = tank set temperature or [50°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 + [-1°C]
Case 1:
THERMO OFF TEMP:
o
1. THERMO OFF TEMP = Heat pump tank target temperature + [1°C].
2. Tank temperature > THERMO OFF TEMP for continuous 10 seconds after compressor off, switch 3
ways valve to room side.
Next THERMO ON TEMP:
o
1. THERMO ON TEMP = Heat pump tank target temperature + [-1°C] or
2. If tank temperature < THERMO ON TEMP AND External Room Thermo OFF, switch to tank side.
Case 2:
Heat pump THERMO OFF TEMP:
o
1. Heat pump THERMO OFF TEMP = 53°C + [+4°C].
2. Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 3 minutes, heat pump
OFF.
Next THERMO ON TEMP:
o
1. THERMO ON TEMP = Water inlet when heat pump THERMO OFF + [-3°C].
2. If water outlet temperature < THERMO ON TEMP AND External Room Thermo OFF, heat pump ON.
Case 3:
Heat pump THERMO OFF TEMP:
o
1. Water inlet temperature > 55°C for continuous 60 secs, heat pump OFF.
Next THERMO ON TEMP:
o
1. THERMO ON TEMP = Water inlet temperature < 55°C.
2. If water inlet temperature < THERMO ON TEMP AND External Room Thermo OFF, heat pump ON.
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.
o
THERMO ON TEMP:
o
1. THERMO ON TEMP = Heat pump tank target temperature + [-1°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:-
During External Room Thermo ON time, follow normal backup heater control operation.
o
During External Room Thermo OFF time, Backup heater OFF.
o
4 Booster heater control:
Booster heater On/Off follow normal operation.
o
* Under solar priority is set condition, when solar 3 way valve is ON, booster heater turn OFF.
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