134
Heat pump and water pump OFF when ROOM thermo OFF
Heat mode: ROOM thermo OFF (Buffer Tank Temperature > Target Buffer Tank + [0°C]
Cool mode: ROOM Thermo OFF (Both Zone thermo OFF by Room Th or Room Thermostat)
14.1.7 Auto Mode Operation
Outdoor Ambient
Cool To Heat
Setting Temp.
COOL
MODE
HEAT
MODE
Heat To Cool
Setting Temp.
Control details:
o To enable the unit to operate either heat or cool mode automatically, heat to cool set temperature and
cool to heat set temperature can be set by control panel.
o Automatic operation is judged based on control panel setting temperature and outdoor ambient
temperature.
* Minimum setting of heat to cool set temperature is 1°C higher than cool to heat set temperature.
Judgement control:
o If outdoor ambient temperature < Heat to Cool Set Temperature, unit will operate in Heat Mode or else
the unit will operate in Cool Mode.
o If current operation is Cool mode, outdoor ambient temperature > Cool to Heat Temperature, unit will
maintain Cool mode operation or else the unit will operate Heat mode.
o If current operation is Heat mode, outdoor ambient temperature >Heat to Cool Temperature, unit will
maintain Heat mode operation or else the unit will operate Cool mode.
o Every 60 minutes the outdoor ambient temperature is judged.
o When Auto + Tank mode is selected, operation mode switching is judged by both outdoor ambient
temperature and indoor air temperature.
14.1.8 Auto Cooling Mode Operation Limit
10°
Compressor
ON
8°
Compressor
OFF
Outdoor Ambient
Temperature
Auto Mode Cooling Only operation will start once the outdoor ambient temperature reaches 10°C and
compressor will continue to run until the outdoor ambient temperature drops to 8°C.
Due to this limitation,
If Heat to Cool temperature is set lower than 10°C, the compressor will not operates until the outdoor
ambient temperature reaches 10°C or higher.
14.1.9 Tank Mode Operation
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.
Tank Thermo ON/OFF Characteristic
Tank Thermo OFF
Case 1: Internal Tank Heater is select and Tank Heater ON
o Tank temperature > Tank Set Temperature continuously for 15 seconds. OR
o Water outlet >75°C
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