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Characteristic of heat pump thermo ON/OFF under tank side condition
a) Water Outlet Thermo Condition
o Heat pump THERMO OFF TEMP:
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.
o Next THERMO ON TEMP:
1. THERMO ON TEMP = Water inlet when heat pump thermo OFF + [-3°C].
2. When water outlet temperature < Heat pump THERMO ON TEMP, heat pump ON.
b) Water Inlet Thermo Condition
o Heat pump THERMO OFF TEMP:
1. Water inlet temperature > [55°C] for continuous 60 seconds, heat pump OFF.
o Next THERMO ON TEMP:
1. THERMO ON TEMP = Water inlet temperature < 55°C.
c) Solar Operation Condition (Only under Solar Priority Set Condition)
o When solar request ON, solar valve will ON and switch 3 ways valve to room side.
o THERMO ON TEMP:
1. THERMO ON TEMP = Heat pump tank target temperature + [-2°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:-
o Back-up heater does not operate at Cool + Tank Mode.
4. Booster heater control:-
o Booster heater ON/OFF follow normal operation.
* Under solar priority is set condition, when solar 3 way valve is ON, booster heater turns OFF.
5. Solar 3 way valve:
o Solar 3 way valve operates follow solar operation specification.
* Under solar priority is set condition, when solar 3WV turns 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 operates to tank side.
6. 2 ways valve control:
o 2 ways valve is closed.
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