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12.1.5 Tank Mode Operation
Control contents:
3 ways valve direction
o 3 ways valve switch to tank side during Tank Thermo ON condition. Switch 3 ways valve to room side when
tank achieve Tank Thermo OFF temperature and SOLAR turn ON condition.
Heat Pump Thermostat characteristic
o Water set temperature = Tank set temperature or [50°C] whichever lower.
o Heat pump Water Outlet set temperature is set to [53°C] at tank mode.
Tank Thermo ON/OFF characteristic
o THERMO OFF TEMP:
1. THERMO OFF TEMP = Tank water set temperature + [0°C].
2. Tank temperature > THERMO OFF TEMP for continuous 10 seconds after heat pump OFF, water pump
OFF or
3. Tank temperature > Tank set temperature + [2°C] for continuously 20 seconds.
o THERMO ON TEMP:
1. THERMO ON TEMP = Tank water set temperature + [-2°C].
When detect tank temperature < THERMO ON TEMP, water pump ON for 3 minutes then heat pump ON.
Characteristic of heat pump thermo ON/OFF under Tank Mode condition:
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 Heat pump THERMO ON TEMP:
1. Heat pump THERMO ON TEMP = Water inlet during thermo OFF time + [-3°C].
2. Heat pump ON back when water outlet temperature < Heat pump THERMO ON TEMP.
Water Inlet Thermo Condition
o Heat pump THERMO OFF TEMP:
1. Water inlet temperature > 55°C for continuous 60 seconds, heat pump OFF.
o Heat pump THERMO ON TEMP:
1. Heat pump THERMO ON TEMP = Water inlet temperature < 55°C.
Booster heater control
o Booster heater turns ON and OFF follow normal operation.
o Booster heater turns ON condition:
1. During start up time (initialization), Booster heater turns ON after DELAY TIMER.
2. When tank temperature lower than HEATER ON TEMP.
3. 20 minutes from previous heater OFF.
o Booster heater turns OFF CONDITION:
1. When tank temperature higher than tank set temperature for continuous 15 seconds.
Solar 3-way valve
o Solar pump operates follow solar operation specification.
2 way valve closes
Other
o Indoor backup heater cannot be ON during tank mode only.
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