THX9321/9421 Prestige
®
IAQ and RF EIM
7
69-2490—03
Install optional sensors
1 Mount the sensor on a vertical
exterior wall, at least 6 inches below
any overhang. Choose a location
protected from direct sunlight.
2 Place sensor securely in bracket,
facing away from wall.
6
M28491
M28849A
[If no sensors are used, skip to Section 7.]
To install outdoor air sensor
To install indoor air sensor
1 Remove the wallplate and mount it 4
to 6 feet above the floor on an interior
wall. Drill 3/16-inch holes for drywall,
7/32-inch for plaster.
2 Attach sensor securely to wallplate as
shown.
To install discharge/return air sensor
1 Install the sensor between the IAQ
equipment and the heating/cooling
equipment. The sensors must be in air
that is mixed well (away from a-coil/
heat exchanger).
2 Drill 1/4-inch hole for the sensor
probe and mount it to the ductwork
with enclosed screws.
3 Connect wires to S1 or S2 terminals at
the EIM.
M32995
M32936
69-2490_B.indd 7
7/13/2011 1:41:52 PM
