Specifications

CAREL gaSteam
19
5.3.4 Control Wiring for H Type Modulating With Humidity Display
The H Type control program is designed to accept an input signal from a humidity sensor (HT), not a DDC
signal. This humidity sensor input signal is then displayed on the controller as the relative humidity. The set
point and differential are entered into the controller, making it stand-alone. Figure 5.5.1 is the wiring for the
ASWH10000 wall mount sensor and the ASDH10000 duct mount sensor. Figure 5.5.1 also shows the control
scheme.
The H Type control program can also accept a second sensor (in this example shown as an ASDH10000 duct
sensor), which acts as a high limit and will modulate the output down on approaching either the main set point
or the high limit set point (see Figure 5.5.2). This is a very useful feature in VAV systems where the airflow can
vary, and also in high precision applications where the on/off cycling of a high limit humidistat would be
detrimental to precision.
In place of the control humidity sensor, a temperature sensor could be used in applications where the humidifier
will be used for a steam bath.
Figure 5.5.1
Figure 5.5.2
HI-LIMIT
HUMIDISTAT
A
IRFLOW
SWITCH
+ (G)
Out H
M
(HT) ASWH100000
+ (G)
Out H
M
(CH) ASDH100000
1Z
2Z
3Z
4Z
5Z
6Z
7Z
8Z
9Z
10Z
11Z
12Z
13Z
14Z
OR
HT
HI-LIMIT
HUMIDISTAT
A
IRFLOW
SWITCH
+ (G)
Out H
M
ASWH100000
ASDH100000
1Z
2Z
3Z
4Z
5Z
6Z
7Z
8Z
9Z
10Z
11Z
12Z
13Z
14Z
OR