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INSTAllATION
MOUNT CONTROl
If replacing a control mounted in the living space, see Control Mounted in living Space on
page 5 .
fIGURE 2 – Disassemble Control
T
A R
A P
L L
P U
fIGURE 3 – Mount backing Plate
4
C
R
D H
BACKING
D H
PLATE
FRONT COVER
ANCHOR
C
R
D H
D H
BACKING PLATE
SCREW
REqUIRED COMPONENTS
18 – 24 gauge wire (field supplied) – 4 wires required, run new cable as needed .
(2) #8 x 1-1/2" mounting screws (supplied)
(2) Anchors (supplied)
1. L evel the backing plate on the wall and mark the mounting holes and wire access location
on the wall .
2. D rill two 3/16" mounting holes and a 3/4" wire access hole. See figure 3 .
3 . Install the drywall anchors flush with the wall surface . Note: Mounting holes on the backing
plate are designed to fit on a horizontal J-box .
4 . Run a 4-wire cable from the dehumidifier to the wall mount location and through the square
hole in the backing plate.
5. S ecure the backing plate to the wall using the two #8 x 1-1/2" screws.
6 . Connect wires to the C, R, and both DH terminals on the backing plate.
7 . Push excess cable into the wire access hole and fill the hole with insulation . Note: Failure
to seal the hole can cause drafts to enter the control and affect sensing accuracy .
REPlACING A MANUAl DEHUMIDISTAT
STEP 1 – REMOVE THE CURRENT MANUAl CONTROl
If THE CONTROl IS MOUNTED IN THE
lIVING SPACE:
90-1631
1 . Disconnect power to the dehumidifier
and HVAC system.
2. P ull knob from the dehumidistat cover and
remove cover from the control base .
3 . Remove the four screws from the base plate .
4 . Pull the dehumidistat off the wall until wire
nuts are exposed .
5 . Remove dehumidistat leads .
6 . The existing 2-wire cable can remain . The Model 75 wiring requires 4 wires . Install more
wires as needed .
7 . Mount the Model 75 control following steps 1-5 in the MOUNT CONTROl section above .
Reuse the existing wire access hole and wiring as needed .
8 . Connect the existing wires (from 1730A REMOTE terminals) to the DH terminals and
connect the remaining two wires to the C and R terminals on the Model 75 backing plate.
90-1632
9 . Proceed to WIRING section on page 7 .
fIGURE 4 – Manual Dehumidistat
5
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