13
Control mode 3, Humidity control
RH
RH max
Humidification and dehumidification can be used simultaneously. A neutral zone can be set
between humidification and dehumidification.
The humidity transmitter must have an output signal of 0...10 V DC, for example:
HRT, HRT250 or HRT350
Room humidity transmitters
HDT2200 or HDT3200
Duct transmitters
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.
Maximum
Limiting, RH Max
When running humidification with the main sensor in the room it is sometimes desirable to
have some sort of maximum limiting on the humidity in the supply duct.
To create such a limiting function, place an on/off humidistat such as HMH in the supply air
duct and wire it into the start signal circuit on DI1. The humidistat should be normally
closed.
Opening of the contact when the humidity rises above the set maximum value will force the
humidity output to 0.
24 V AC
Start
signal
Humidity
transmitter
Humidifier
Dehumidifier
HMH Max limiting
humidistat
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
-
+
-
+
% RH
G0
G
Y