11
4. Heating
/ Heating
5. Cooling
/ Cooling
6. Heating
/ Damper
7. Cooling
/ Damper
8. Change-over/
-
(Seasonal change-over between heating and cooling)
DI1, Start signal
Normal control will only be activated when this input is activated, closed. When the start
signal is deactivated the controller will set the outputs to 0.
Note: This input must always be wired since it controls the starting and stopping of normal
control.
Universal input UI1, Change-over
The change-over function will make a seasonal change of the function of the output signal on
AO1. In summer the output will work as a cooling output and in winter as a heating output.
This is used in applications (fan-coil units) where the same piping is used to transport hot
water in the winter and chilled water in the summer.
The universal input UI1 is used for the change-over function in alternative 8. Wire the input
as a digital input using either a manual switch or a thermostat monitoring the supply water
temperature to open/close the input. Open contact will give heating control and closed
contact cooling control.
Damper
In applications with dampers it is often desirable to be able to set a minimum amount of fresh
air. In the output alternatives 6 and 7 it is possible to set a minimum limit value to the
damper output signal. The damper output will then not go lower than the set value during
normal operation. On shut-down however the signal will go to zero.
In the output mode heating – damper the damper will be fully open for temperatures higher
than the setpoint. On increasing heat demand the damper will first close to the minimum
value before the heating output starts to increase.
In the output mode cooling – damper the damper will be fully open for temperatures lower
than the setpoint. On increasing cooling demand the damper will first close to the minimum
value before the cooling output starts to increase.
24 V AC
Start signal
+
-
G
G0
DI+
DI1
UI+
UI1
A
GND
AI1
1
2
3
41
42
43
44
50
51
20
21
22
A
GND
AO1
AO2
°C
G0
G
Y
G0
G
Y