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'10 • HM-T-149
Supply water temperature control in heating
Target supply water temperature can be seen in Menu 2.0 (for heating system 1) and 3.0 (for heating system 2).
For dual system, the target temperature for downstream heating system must be lower than that for upstream heating system.
Heating curve
Heating curve is the basic principle to decide the target supply water temperature for heating.
The lower the outdoor air temperature (BT1) becomes, the higher the target supply water temperature becomes, and the characteristics
can be adjusted in Menu 2.1.2 (for heating system1) or in Menu 3.2 (for heating system 2).
The gure below shows the case that heating curve 9 is chosen. In this case, the target supply water temperature is 55°C at -20°C
outdoor air temperature condition.
Heating curve offset 0
Heating curve offset
It is possible to offset the heating curve chosen in the menu above in order to obtain higher target supply water temperature.
The offset for heating system 1 can be set using the knob on the controller. The set value can be seen in Menu 2.1.1.
The gure below shows the case that heating curve 9 is chosen with heating curve offset +2. In this case, the target supply water
temperature is 60°C at -20°C outdoor air temperature condition.
Heating curve offset +2
The offset for heating system 2 can be set in Menu 3.1.
Operation control function by the indoor unit controller
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