High Limit Humidistat; Humidity Sensor - CARNES HXHAS Owner's Manual

CommerCial humidiStat | operation

high limit humidistat

In the high limit humidistat mode the humidistat will measure the relative
humidity of the space, compare the measured value with a high-set set-
point, and output a demand signal to the humidifier. The demand signal in
this mode can be either ON/OFF or a modulating 0-10VDC signal. If the
measured humidity is greater than the high-set setpoint, the demand signal
will be zero, and if the measured humidity reaches 10% below the setpoint
the demand signal will be 100%. The ON/OFF signal will turn on when the
measured humidity is 10% below the setpoint and will back off when the
measured humidity is greater than the setpoint. The high limit humidistat
typically works in conjunction with a wall humidistat to prevent duct work
from becoming saturated by reducing the humidifier output when high-
humidity levels are reached.

humidity Sensor

In humidity sensor mode the humidistat module will measure the relative hu-
midity of the space and output a 0-10VDC signal corresponding directly with
the measured humidity (0%RH = 0VDC, 100%RH = 10VDC). This mode can
be utilized when the Carnes humidifier has been configured to function using
a humidity sensor and not a common humidistat. Utilizing the humidistat and
humidifier in this way allows for the user to set the setpoint at the humidifier
and not the humidistat. This is the preferred operation for BACnet enabled
humidifiers.
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