SKG4-E Gas Fired Humidifier
Installation Instructions and User Manual
Page | - 46 -
Controls Placement (Steam Dispersed into a Duct or
AHU)
A typical humidifier control system includes the following along with the humidifier:
A wall or return duct humidistat
A high limit duct humidistat
An airflow switch
Placement of these devices is critical to the proper operation of the overall system.
The return air humidistat must always be located in the return air duct, in order to ensure
accurate sensing of the air from the humidified space.
Alternatively, a room humidistat can be used. The room humidistat must be located on an
inside wall or column. It must not be near any discharge air from supply ducts or sources of
heat or cold.
The airflow switch must be placed in a position capable of accurately opening on a loss of air
flow, in order to prevent the humidifier from running when there is no air to absorb humidity.
The high limit humidistat must be positioned far enough, minimum 4.6 m, downstream of the
steam dispersion manifold(s) to prevent over humidification of the duct that could result in
condensation.
Return SHC80
Humidity sensor
Or room HRO20
humidistat
SHS80 high limit for constant
flow and VAV application
15' minimum
(4.6m)
Air flow switch
Steam dispersion
manifold
Return Air
F
re
s
h
A
ir
Air
Illustration 46 - Controls Placement (Steam Dispersed into a Duct or AHU)
Summary of Contents for SKG4-E Series
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