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69-0821 2
DUCT MOUNTING
1. Locate the humidity controller at least 8 in. [203 mm]
upstream of the humidifier in the return air duct.
NOTE: If mounting near an elbow area, keep the humidity
controller 6 in. [152 mm] upstream of the elbow so the
element will be affected by the normal airflow (Fig. 3)
.
2. Using Fig. 4 and the instructions on the template,
drill two mounting holes (3/32 in. [2.4 mm]) and 12 sensing
holes (1/4 in. [6.4 mm] in diameter) in the duct. (The
sensing holes allow return air to reach the nylon sensing
element and operate the humidity controller.)
NOTE: If desired, cut a square hole in the duct as indicated
on the template in place of the sensing holes.
Fig. 3—Selecting a duct location for the humid-
ity controller.
BEST LOCATION
RETURN
AIR
RETURN
AIR
6 in. [152 mm]
MINIMUM
15 in. [381 mm]
MINIMUM
ALTERNATE
LOCATIONS
RETURN AIR DUCT
M9277
3. Remove the protective backing from the foam gasket
included with each control and apply the foam gasket to the
template in the location indicated.
4. Remove the cover and humidity controller assembly
from the case by prying with a screwdriver in the notch in
the bottom of the case (Fig. 1).
5. Run low voltage wire from the humidity controller to
the template (Figs. 5 and 6).
6. Lay wire over one side of the foam gasket allowing
about 6 in. [152 mm] for connection to the humidity con-
troller. Wire can enter the humidity controller case from
any direction.
NOTE: Do not position wire directly under the two stand-
off projections at the back of the case. If wire is under
these projections, the case will not seat tightly against
the gasket, causing air leakage and possible improper
operation.
7. While holding wire in place, mount the case on the
duct using the two mounting screws provided.
NOTE: Tighten the screws firmly so the gasket seals the
space between the case and the duct (Fig. 4).
8. Connect the wires to the humidity controller assem-
bly using leadwires and wire nuts supplied (see Wiring
section and Fig. 2).
9. Snap cover assembly into the case.
Fig. 4—Mounting humidity controller on return
air duct.
UP
TEMPLATE
LOCATE TEMPLATE.
PEEL BACKING
FROM TEMPLATE
AND APPLY TO DUCT.
PUNCH AND DRILL
TWO 3/32 IN. [3 mm]
MOUNTING HOLES.
DRILL MINIMUM
OF TWELVE
1/4 IN. [7 mm] HOLES.
OR
DRILL OR PUNCH
CORNER HOLES AND
CUT OUT SQUARE
ON SOLID LINE.
GASKET
CASE
M9264
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