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humidistat
The humidistat is designed to mount on the cold air plenum of
your furnace or on an interior wall of the home. The cold air ple-
num, however is the preferred location for sensing the average
humidity throughout your home. Select your location and follow
the appropriate instructions.
NOTE: THE HUMIDISTAT AS SUPPLIED IS ASSEMBLED I
FOR COLD AIR PLENUM INSTALLATION (FIG. 21).
cold air plenum mount (F g.21)
1 Select a location that is a minimum of 6" upstream
on cold air plenum (Fig. 22). Peel off paper backing and posi-
tion template supplied, drill (4) 1/8" diameter holes and cut out
center portion along solid line. Peel off backing and apply gasket
material as indicated by dashed lines.
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CAUTION: _ install humidistat on hot air plenum. I
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-_ 2 Remove knob and cover from humidistat. To remove
cover, place screwdriver blade in slot at side of humidistat and
twist.
Position humidistat in opening and fasten with 4
screws provided.
_ 4 Install shaft extension. Install cover by snapping onto
backplate. Press knob onto shaft extension.
Connect wiring (Fig. 24). Plug 24 VAC transformer
into 120 VAC outlet.
_i 6 Peel off backing and attach the operating instruc-
tion label onto the cold air plenum next to the humidistat.
Run low voltage wire through the wall. Exit hole must
be within the lower backplate opening. (Purchase additional
wire as required.)
5 Connect low voltage wires from wall to previously
cut leads on humidistat by stripping ends and using wire nuts
(not provided). Position and fasten humidistat to wall with (4)
screws provided. Install cover by snapping onto backplate.
Press knob onto humidistat shaft. Make sure 1/8" air space is
maintained between wall and backplate to allow air circulation
and humidity sensing.
6 Connect wiring (Fig. 24). Remove electrical discon-
nect by cutting wires on harness, strip ends and splice to low
voltage wire from wall humidistat using wire nuts. (Wire nuts
not provided. Purchase them from your local Sears Hardware
Store.) Plug 24 VAC transformer into 120 VAC outlet. Do not
use existing transformer on furnace.
NOTE: Humidifier humidifies only when furnace is on, I
however, Media Wheel will turn whenever humidistat
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calls for humidity.
NOTE: If the installation is being made in the sum-
mer or when the humidity is high, turn knob to the
test position and the humidifier should start. When
your system is working satisfactorily, turn knob back
to the minimum humidity setting until winter.
NOTE: By turning knob to the test position humidifier
should start. (Do not leave on test.)
wall mount (Fig.
r i I Remove knob and cover from humidistat.To remove
cover, place screwdriver blade in slot at side of humidistat and
twist.
2 Convert humidistat for wall mounting by removing
control unit from backplate. Reassemble control unit to
backplate as illustrated in (Fig. 23) with spacers to rear and
shaft forward. Remove electrical disconnect by cutting the (2)
wires. Strip ends 1/2" for splicing to wall wire.
I NOTE: Shaft extension is not for wall
required mounting.
i 3 Select a location on a convenient inside wall, usu-
ally beside your furnace thermostat.