H46C HUMIDITY CONTROLLER
H46C
HUMIDITY CONTROLLER
RISE
DEHUMIDIFIER
L1
EXHAUST FAN
(HOT)
1
1
OR AIR
POWER
CONDITIONER
SUPPLY
L2
PROVIDE DISCONNECT MEANS AND OVERLOAD
M7923
PROTECTION AS REQUIRED.
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 indepen
dently 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
T87F/Q539A INTERNALSCHEMATIC
TEMPERATURE
FALL
1
2
3
PROVIDE OVERLOAD PROTECTION AND DISCONNECT MEANS
AS REQUIRED.
HEATING DAMPER MOTOR, IF USED.
CLOGGED FILTER SWITCH OR COOLING PANEL CONNECTION.
1
3
2
B
X
O
R1
W
Y
W1
Y1
G
R
H
R
HEAT
OFF
FAN
AUTO
ON
COOL
HEAT
OFF
COOL
FIXED
COOL
ANTICIPATOR
ADJUSTABLE
HEAT
ANTICIPATOR
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN RELAY
COIL
FILTER
LIGHT
T87F
M7913
Fig. 3. Typical parallel wiring hookup for H46C with T87F/Q539A combination
for dehumidification and mildew control.
95-5367-4
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