sauter NRT407, Manual

Page: 26 / 76

26 Part III Configuration NRT407 manual
Heating/Cooling with VAV-control
Heating and cooling are controlled in the same way as in the VAV-control above. The
damper cannot be forced like above. There is also a function that opens the supply air
damper on heating demand. This is normally always required if the heater is placed in the
supply air duct, to carry the heat to the room. A maximum limit is set for the opening of the
damper on heating demand. The factory setting is zero, which means that the function to
open the damper on heating demand is not active. The basic flow can also be set separately.
Max airflow on
heating demand
(settable)
Output signal
Cooling Heating
0 %
Temp (°C)
100 %
Basic airflow
(settable)
Heating output Cooling output
Increasing airflow on
heating demand
SP
heating
SP
cooling
Cooling
In control mode Cooling, the unit is always a cooling controller and controls according to the
basic cooling setpoint plus the setpoint adjustment.
Cooling/Cooling
Split output signal In control mode Cooling/Cooling, the controller always functions as a cooling controller and
controls according to the basic cooling setpoint plus the setpoint adjustment. The control
signal is divided between the two outputs with a deadband in between. The first output
(UO1) works between 0...48 % of the control signal. When the control signal reaches 52 %,
UO2 starts to operate and will be 10 V when the control signal is 100 %. See the figure
below:
Output signal
Cooling 2 Cooling 1
0 %
100 %
100 %
48 % 52 % Cooling demand
Heating/Cooling/VAV
This control mode offers the possibility to control three analogue outputs: heating, cooling
and VAV. When the controller is in cooling mode, the control signal is split between cooling
and VAV (this control mode is only available in …C3 models, except RC-C3DFOC), see
figure below: