SKE-XL BACnet Steam Humidifier
Installation Instructions and User Manual
19
Stage 6
– Electrical Control Connections
Controls
placement
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 proper operation of the overall system.
The return duct humidistat must always be located before any outside air intake,
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 positioned to accurately open on a loss of air flow, to
prevent the humidifier from running when there is no air to absorb humidity.
The high limit humidistat must be positioned far enough - minimum 4.6m -
downstream of the steam dispersion manifold(s) to prevent it from getting wet,
but still allows it to accurately prevent over humidification of the duct that could
result in condensation.
(Illus. 21)
Return SHC80
Humidity sensor
a
ir
a
ir
air
air
Or room HRO20
humidistat
SHH8 High limit humidistat
High limit SHC80 for
VAV application only
4.6m min
Air flow switch
Steam dispersion
manifold
