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Installation Cont.
4. Assemble distributor tube so that it is directed into the
center opening of the distributor trough cover.
5. Connect 1/4" water supply tube to brass filter at inlet of
solenoid.
CAUTION: Do not use plastic tubing in contact with any
!
hot plenum surface or duct. If using plastic tubing, use
tube support provided.
Installing / Wiring The Control
!
WARNING:
ALL WIRING SHOULD COMPLY WITH LOCAL ELECTRICAL CODES.
6. MHX3C: DUCT Mounting (Return Air Duct)
!
CAUTION
: Do not install the humidistat on the warm air duct.
1. Locate the humidistat at least 24" upstream of the
humidifier or bypass on the return air duct. Avoid areas
of direct radiation like secondary heat exchangers in the
fan compartment.
2. Place template using level. Cut sensor hole as shown on
template. Drill four 3/32" holes (not shown).
3. Remove the housing from the base by prying with a
small screwdriver at the notch in the side of the housing.
4. Gaskets: Place the outer portion ONLY of the thin foam
gasket on the humidistat base and mount the base
with four screws. Place the thick gasket inside the wall
mount base to seal off air entering through the vents.
Low voltage wire may enter the humidistat under the
foam seal.
5. Connect wires to screw terminals on the control
assembly as shown in wiring diagram. Replace housing.
Thick Gasket
DUCT MOUNT ONLY
Model 1137 Humidifier Installation Manual
Distributor
Trough Cover
Distributor Tube
(Metal)
Water
Supply
Tube
FIG. 1
Face
6. MHX3C: WALL Mounting Instructions
1. Choose a location for the humidistat about five feet
above the floor on an inside wall with average room
temperature and humidity conditions.
2. Drill a small hole in the wall and run low voltage wiring
to the location chosen. Pull about 6" of wire through the
hole. Plug the opening to prevent drafts from affecting
the humidistat operation. Remove the housing from the
base by prying with a small screwdriver at the notch in
the side of the housing.
3. Gaskets: Place the entire outer and inner portions of the
gasket on the base as shown. Do NOT install the thick
gasket inside the base.
4. Mount the base horizontally over the wires using level.
Attach directly to the wall, using four screws provided.
5. Connect wires to screw terminals on the control assembly
as shown in wiring diagram. Replace housing.
Thin Gasket
DUCT MOUNT: Use
ONLY Outer Portion
WALL MOUNT: Use
Outer & Inner Portions
Mounting
Base
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