Honeywell H46C User Manual
H46C Humidity Controller
2 X 3 IN.
INSTALLATION INSTRUCTIONS
APPLICATION
The H46C Humidity Controller is used with portable and
central unit dehumidifiers to maintain relative humidity.
The H46 has an spst, snap-acting switch designed for
line voltage circuits and two leadwires for switch box
mounting.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
2. Check the ratings in the instructions and on the
product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
CAUTION
Electrical Shock Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power supply before connecting
wiring.
Location
Select a location about 5 ft (1.5m) above the floor in an
area with good circulation at average temperature and
humidity for the area to be controlled. Avoid locations
near hot or cold air ducts and discharged air from the
controlled equipment.
Mounting
1. Remove the setting knob.
2. To remove cover, pull cover forward from device.
3. Install a 2 in. x 3 in. (51 mm x 76 mm) vertical
switch box at the selected location.
4. Using the two screws provided, fasten the adapter
plate to the switch box, as shown.
5. Pull the wires from the switch box through the
opening in the adapter plate and connect to the
H46 leadwires with the solderless connectors
provided. See Fig. 2 and 3 for typical hookup.
6. Push the wires back into the switch box.
7. Place the H46 against the adapter plate, making
certain the tab at the bottom of the plate fits into the
notch on the H46.
8. Fasten the H46 to the adapter plate by tightening
the captive screw.
9. Replace the cover and the setting knob.
ADAPTER PLATE
H46 CAPTIVE
MOUNTING SCREW
SCREWS (2)
H46
(COVER OFF)
NYLON
ELEMENT
Fig. 1. Mounting H46C on vertical switch box.
SWITCH BOX
ADAPTER PLATE
PLATE TAB
H46 LEADWIRES (2)
WALL SURFACE
M7907
Wiring
Disconnect power supply before connecting wiring to
avoid electrical shock or equipment damage. All wiring
must comply with local codes or equipment damage. All
wiring must comply with local codes and ordinances. Do
not exceed contact and coil ratings when wiring into
system. See Fig. 2.
® U.S. Registered Trademark
Copyright © 2003 Honeywell International Inc. • • All Rights Reserved
95-5367-4
H46C HUMIDITY CONTROLLER
H46C
R
N
P
R
S
3
HUMIDITY
CONTROLLER
RISE
L1
(HOT)
OWER
1
UPPLY
L2
PROVIDE DISCONNECT MEANS AND OVERLOAD
1
PROTECTION AS REQUIRED.
DEHUMIDIFIE
EXHAUST FA
OR AIR
CONDITIONE
M7923
Fig. 2. Typical H46C wiring diagram.
Connections and Operation
A dehumidistat in combination with the thermostat can be
used to run the air conditioner to control relative humidity
levels. The dehumidistat and thermostat can be wired in
parallel or in series.
Wiring in parallel allows the dehumidistat to independently control the humidity level, but could cause
overcooling of the home. During unoccupied times, the
homeowner should set the thermostat to a relatively high
setting and control moisture using the dehumidistat.
Wiring in series prevents overcooling but the air
conditioner runs only when both the thermostat and
dehumidistat are calling. During unoccupied times, the
homeowner should set the thermostat to a relatively low
setting and control moisture using the dehumidistat.
SETTING AND ADJUSTMENT
The H46 makes contact on a relative humidity rise to the
setpoint to start the dehumidifier. On a decrease in
relative humidity to the setpoint (minus the differential),
the switch breaks contact to stop the dehumidifier. Turn
the knob clockwise to the setting stop to place the H46 in
the On position. Turn the knob counterclockwise to the
setting stop to place the H46 in the Off position.
CHECKOUT
After completing all mounting and wiring, turn on the
power supply. Place the system into operation by turning
the setting knob toward the low end of the scale until the
dehumidifier motor starts. Turn the setting knob slowly
toward the high end of the scale until the dehumidifier
motor stops.
H46C
FILTER
LIGHT
HEAT OFF FANAUTO ONCOOL
3 2
PROVIDE OVERLOAD PROTECTION AND DISCONNECT MEANS
1
AS REQUIRED.
HEATING DAMPER MOTOR, IF USED.
2
3
CLOGGED FILTER SWITCH OR COOLING PANEL CONNECTION.
Fig. 3. Typical parallel wiring hookup for H46C with T87F/Q539A combination
for dehumidification and mildew control.
T87F/Q539A INTERNALSCHEMATIC
R1
BX O
T87F
TEMPERATURE
FALL
W1 Y1
HEAT OFF COOL
W Y
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FIXED
COOL
ANTICIPATOR
G RHR
FAN RELAY
COIL
ADJUSTABLE
HEAT
ANTICIPATOR
1
M791
95-5367-4 2
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