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Installing the Humidistat
Duct-Mount Installation (continued)
5. Insert the duct tube.
Insert the duct tube through
the wallplate before securing
to the duct.
7. Run wires through the back plate.
C
R
U
U
S
S
Run wires through the top or bottom channel on the
back plate when duct-mounted. If installing like a
thermostat on a wall, run the wires through the back.
Wiring the Humidistat
This humidity control is wired the same way a manual
humidistat (H8908) is wired. The only difference is
that you also wire in power (24 VAC) and an outdoor
sensor.
Humidifier 33-00617EFS—01
M34671
RUN WIRES
THROUGH THE
TOP OR BOTTOM
CHANNEL
M34610
6. Secure the wallplate.
Secure the wallplate to the duct with
sheet metal screws (provided).
TERMINAL DESIGNATION
C 24 VAC POWER FROM EQUIPMENT
R 24 VAC POWER FROM EQUIPMENT
U HUMIDIFIER*
U HUMIDIFIER
S OUTDOOR SENSOR
S OUTDOOR SENSOR
NOTES:
C AND R MUST BE CONSTANT 24VAC! RECOMMENDED TO WIRE TO
FURNACE/AIR HANDLER CONTROL BOARD.
DO NOT WIRE C AND R TO HUMIDIFIER TRANSFORMER IF THAT
TRANSFORMER IS ONLY POWERED WHEN FAN IS RUNNING.
* 24 VOLTS NEEDS TO BE WIRED IN SERIES WITH THE HUMIDIFIER ON U
TERMINALS. SEE WIRING DIAGRAMS.
M34582
24 VAC (CONSTANT)
TO HUMIDIFIER
OUTDOOR
TEMPERATURE
SENSOR
M34865A
C
R
U
U
S
S
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