Model 1042LH Humidifier Installation Manual
Installing / Wiring The Control
WIRE JUMPER
7 D
(HOT)
115v.
60CY.
ON-OFF SWITCH
COMMON LEAD
FURNACE
C
HI
LO
GA50
CURRENT
SENSING
RELAY
MULTI
SPEED
BLOWER
MOTOR
AC L
AC N
HUM
SNSR
24V. SOLENOID VALVE
727-58 24 V. TRANSFORMER
(HOT)
C
115v.
60CY.
ON-OFF SWITCH
AC L
AC N
HUM
SNSR
24V. SOLENOID VALVE
727-58 24 V. TRANSFORMER
L1
C
NO
(HOT)
L2
115v.
60CY.
ON-OFF SWITCH
12500 AIR
PRESSURE SWITCH
AC L
AC N
HUM
SNSR
24V. SOLENOID VALVE
727-58 24 V. TRANSFORMER
R
FURNACE
CONTROL BOARD
C
24v.
60CY.
AC L
AC N
HUM
SNSR
24V. SOLENOID VALVE
FURNACE
BOARD
W
WIRE JUMPER
OUTDOOR TEMP. SENSOR
OUTDOOR TEMP. SENSOR
OUTDOOR TEMP. SENSOR
OUTDOOR TEMP. SENSOR
N
W 24v.
60CY.
WIRE
JUMPER
WIRE
JUMPER
WIRE
JUMPER
6A
6A
6B
6C
6D
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.
6.
GF-
MHX3:
DUCT
Mounting (Return Air Duct)
CAUTION
:
Do not install the humidistat on the warm air duct.
6.
GF-
MHX3:
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.
!
!
WARNING:
ALL WIRING SHOULD COMPLY WITH LOCAL ELECTRICAL CODES.
Thin Gasket
Face
FIG. 1
WALL
MOUNT: Use
Outer & Inner Portions
DUCT
MOUNT: Use
ONLY Outer Portion
Mounting
Base
Thick Gasket
DUCT
MOUNT ONLY
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