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129
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'10 • HM-T-149
Heating thermo-ON / OFF control
The control by DM value is the basic principle to operate/stop the outdoor unit operation.
DM (Degree-Minutes) value
DM value is integrated value of the gap between the target and actual supply water temperature.
Compressor required speed and electric heater ON/OFF are controlled by the DM value.
DM value is limited from +100 to DM start add. heat (Menu 9.2.1) and does not exceed the limit.
Operation state transition according to DM value
According to the DM value, operating state is changed.
Default of DM start heating value (Menu 9.1.1) is -60.
Default of DM start add. heat value (Menu 9.2.1) is -400.
Alternating mode
It implements heating operation only with the outdoor unit. The outdoor unit starts when the DM value becomes DM start heating set
at Menu 9.1.1 or lower.
If hot water demand increases and tank water temperature (BT6) lowers below the set value in Menu 1.3, operation state will switch
to hot water operation. For details, see Hot water operation control.
Combined mode
The system goes into Combined mode only when the electric heater is allowed to use in Menu 8.2.1.
Hot water in tank is used for heating to cover the excess heat load.
Electric heater in the tank is energized, and the target tank water temperature is set at +2°C of heating curve or target tank water
temperature for hot water (set on Menu 1.5), whichever is higher.
Opening degree of mixing valve QN11 is adjusted so that the supply water temperature to the climate system will be -1°C of heating curve.
Note : Electric heater can be replaced with external heat source of the docking feature. See Menu 8.2.1, 8.2.2 and 9.2.8 for setting.
Operation control function by the indoor unit controller
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