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Case 2: Tank Heater OFF OR External Heater is select
o
When heat pump OFF due to water thermos & Tank temperature > Tank water set temperature for
continuously 20 seconds.
OR
o
Tank temperature > Tank set tempe 1°C for continuously 20 seconds.
Tank Thermo ON
Case 1: Tank Heater ON (Internal Tank Heater)
o
Tank temperature < Tank set tempe R/C (Tank re-heat temperature)
Case 2: Tank Heater OFF (Internal Tank Heater)
o
Tank temperature < Tank water set tempe R/C (Tank re-heat temperature)
* When tank thermo ON, water pump will ON for 3 minutes then only heat pump turn ON.
* Tank water set temperature = tank set temperature or 52°C whichever lower.
2 ways valve close
Heat pump Thermostat Characteristic
o
Heat pump Water Outlet set temperature is set to below table:
Outdoor ambient temperature
Heat pump target water outlet temperature
< -10°C
56°C
> -10°C
59°C
Characteristic of heat pump thermos ON/OFF under tank mode condition:
Water Outlet Thermo Condition
Heat pump thermos OFF temperature:
1 Heat pump thermo OFF temperature = Target Water outlet tempe (1°C)
2 Water outlet temperature > heat pump thermo OFF temperature for continuously 3 minutes, heat pump OFF
but water pump continue ON.
Heat pump thermo ON temperature
1 Heat pump thermo ON temperature = water inlet during thermo OFF time + [-3°C]
2 When water outlet temperature < heat pump thermo ON temperature, heat pump ON.
Water inlet thermo protection condition
Heat pump thermo OFF temperature:
1 Water inlet temperature > [60°C/55°C] for continuously 30 seconds, heat pump OFF, water pump continue
ON.
Heat pump thermo ON temperature:
1 Heat pump thermos ON temp = water inlet temperature < [60°C/55°C].
Outdoor ambient temperature
Water inlet temperature
< -10°C
55°C
>-10°C 60°C
Thermo ON/OFF for Heat Pump in Tank Operation:
When tank temperature achieve heat pump OFF condition, refer below condition:
Conditon 1 : Tank Heater ON (Internal Tank Heater)
Heat pump will turn OFF, water pump continue ON and room heater will continue ON if tank temperature below
tank heater thermo ON condition. 3 ways valve will only switch to room side after tank temperature reach tank
heater thermo OFF condition.