NRT405F901 manual Chapter 8 Control principles 20
Control principle in 4-pipe installations
At Comfort mode, neither heating nor cooling is used in order to minimise energy
consumption when the temperature is in the neutral zone. The heating output is activated
when the temperature falls below the set value for the neutral zone. The cooling output is
activated when the temperature exceeds the set value for the neutral zone. The neutral zone is
divided into two equal parts with one part below and one part above the setpoint. See the
figure below. The factory setting for NZC is 2 K.
The above schematic drawings of the control principle show the corresponding requirement
of the controller function. This requirement is recalculated by the controller to a value for the
actuator output, depending on the selected output function.
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