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Temp-Vents -
Humidistats For Powered Unit
A humidistat can
connect to the Power
Temp-Vents to turn the fan on and off
automatically. Two types of humidistats are
available.
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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 raining.
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.
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