Product ID: TV-humidistats
Temp-Vents - Humidistats For
Description: A humidistat can connect to the Power
Temp-Vents to turn the fan on and off automatically. Two
types of humidistats are available.
Model B: Damp weather humidistat, mounts behind an
intake vent, opposite the side where the power vent is mounted.
Power vents stay off when the humidity is above the setting. The
vent turns on when humidity is below the setting or if there is
a quick rise in humidity, so that the unit turns off when it is
Model C: Turns unit on when humidity in crawl space
rises above a pre set limit, usually set at 50% humidity.
The difference between the 2 controllers is the conditions
that they shut off. The HUB (damp weather shut off) is
recommended to be set at 75% RH. The operation of it will cause
it to shut down at any RH above the set point. The HUC is the
opposite, it will turn on at any condition above the set point.
Operation is such that the 2 controllers when plugged together
in series will maintain the humidity in the crawl space between
the set points on the controllers.
For example, the HUB set at 75% and the HUC set at 40% will
run at anytime the crawl space has a humidity below 75% and
above 40%. If the humidity drops below 40% the HUC will shut off
and the fan will no longer run. If the humidity in the space
goes above 75% the HUB will shut off and the fan will no longer
run. The HUB is intended to be placed in the airstream of the
incoming outside air, therefore, if it is raining or humid out
and the fan comes on and starts bringing in air above the HUB
setpoint (75%), the HUB will turn off and the fan will stop.
The obvious down side to this is that if the crawl space
rises above the setpoint of the HUB, the fan will not turn on.
However, without the HUB, the HUC would turn on at anytime the
crawlspace was above its setpoint and run the fan, it could very
well bring in more humid air than is already in the crawlspace,
such as when it was raining outside.
The Humidistat / Thermostat system can be used to control up
to 6 power vents at one time.
TempVents are available through Pest Control
Supply Companies such as: