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Installation, Duct Mounting
The Humidistat can be installed on the return air duct to sense the humidity level whenever the fan is
operating. Use the "Duct Mounting Template" provided to cut an opening in the duct for airflow to the
humidity sensor and two holes for the mounting screws. Use the foam gasket to create a seal
against the sheet metal. Also punch a 1/4" hole in your duct and route the wires into the duct and out
the new opening. This allows you to make your connections easily without having to route the wires
through the vented ribs.
DO NOT REMOVE the vent covers when installing this device on the return duct, or only remove
what is necessary to run your wires through a vent/rib opening.
WIRING
The wiring can pass through the duct or
enter the subbase through an open vent
rib at the bottom or top of the subbase.
Warning: Leave the vent hole
covers in place, when mounting
the Humidistat on the return air
duct! Only remove as much vent
cover material as necessary to
route your wires.
All work should be done to local and
national codes and ordinances.
Use color-coded, multi conductor 18
awg, solid copper wire.
Wire number to number or letter to
letter on each control.
Installation, Wall Mounting
The Humidistat can be installed on a wall within
the conditioned space. Use the "Wall Mounting
Template" provided to cut a small opening in the
wall for the wiring and drill two pilot holes for the
mounting screws. Use the foam gasket to create
a seal against the wall if desired.
Warning: Seal up the wire hole made in the
wall to prevent air leakage from effecting the
RH sensor on the 072000 printed circuit board.
Use plumbers putty, wall compound, or even duct
tape to seal the hole.
Route wires through vent ribs
when inserts are removed, or
route wires thru duct and come
in behind the sub-base.
Remove the plastic covers
at all vent ribs at the top and bottom
of the subbase,
when mounting on interior walls.
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Route wires through
this hole.
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Use the supplied
wall anchors if
necessary.
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