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H1008A,D AUTOMATIC HUMIDITY CONTROL
Location and Mounting
H1008A,D Automatic Humidity Control
IMPORTANT
Do not install H1008 on supply air. Tempera-
tures in excess of 120°F cause the control to go
into error mode. If mounting near an elbow
area, keep the control 6 in. (152 mm) upstream
from the elbow so the humidity and temperature
sensor is exposed to the normal airflow (Fig.1).
Locate the control at least 12 in. (305 mm) upstream from
the humidifier (or dehumidifier/ventilator supply air) in the
return air duct where it can be exposed to the air stream
of the return air. See Fig. 1.
ALTERNATE LOCATION
RETURN
AIR
6 in. [152 mm]
MINIMUM
BEST
LOCATION
RETURN AIR DUCT
Fig. 1. Select duct location for control.
Use the following procedure to mount the H1008A,D in
the return air duct:
1. Remove the cover by placing your thumb in the
bottom notch between the cover and the base and
pulling out and up. See Fig. 2.
Fig. 2. Remove cover from base.
2. Drill 3/4 in. (19 mm) circular opening for the projec-
tion on the back of the base. See Fig. 3. Place the
device on the duct and mark the mounting holes, or
screw in self-tapping screws.
69-1185EF-3
RETURN
AIR
15 in. [381 mm]
MINIMUM
M12822
M12828
NOTE: Be sure the sheet metal surface is flat after
drilling and cutting holes.
BASE
Fig. 3. Mount control on return air duct.
3. Mount the base on the duct using the four mount-
ing screws provided. Tighten the screws until fully
seated with no space between the base and the
duct. See Fig. 3.
4. Run a low voltage wire from the humidifier (and
dehumidifier or ventilator for H1008D) and equip-
ment to the control terminals. See Fig. 5-9. Use
either straight in or wraparound wiring connections.
See Fig. 4.
5. Snap the cover onto the base.
Fig. 4. Correct wiring technique.
C7089H Outdoor Temperature Sensor
NOTE: The C7089H Outdoor Temperature Sensor is
recommended when using the control with heat
pump.
Mount the sensor (purchased separately):
— out of direct sunlight on the North side of the house.
— at least three feet from dryer vents or other vents.
— above the expected snow line where ice and debris
cannot cover it.
Use the following procedure for mounting:
1. Place the sensor in the clamp provided.
2. Insert the screw provided through both of the holes
in the clamp and fasten the sensor in place.
2
3/4 IN. HOLE
M12829A
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
M12827
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