5
www.generalfilters.com
Model 1137 Humidifier Installation Manual
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
Distributor Tube
(Metal)
Water
Supply
Tube
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. Place the outer part of the foam gasket on the
humidistat base and mount the base with four
screws. 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.
6. MHX3C: Mounting On The Return Air Duct
CAUTION
:
Do not install the humidistat on the warm air duct.
6. MHX3C: Wall Mounting Instructions
1. Chose 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.
3. Remove the housing from the base by prying with
a small screwdriver at the notch in the side of the
housing.
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.
!
Distributor
Trough Cover
Use With Duct
Mount Only
Use Both Gaskets
With Wall Mounting
Use Outside Portion
Only With Duct
Mount
Wall Mount Base (Can
Mount On Duct With
Gaskets Shown)
