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®
THX9321 PRESTIGE
2.0 AND THX9421 PRESTIGE
BYPASS
HUMIDIFIER
VENTILATOR
OR
DEHUMIDIFIER
MOUNT RETURN
SENSOR HERE
MOUNT DOWNSTREAM
OF BYPASS HUMIDIFIER,
DEHUMIDIFIER OR
VENTILATOR
Installing Discharge and Return Air
Temperature Sensors
Use the following steps to mount the Discharge/Return
Air Sensors:
1. Attach plastic cover to the sensor probe.
2. Drill 1/4-inch hole for the sensor probe and mount it
to the ductwork with enclosed screws (see Fig. 15).
3. Connect wires to S1, S2, S3, or S4 terminals at the
EIM.
4. Setup the S1, S2, S3, or S4 terminals in the Installer
Setup at the thermostat.
Fig. 15. Mounting Discharge/Return Air Sensor.
68-0311—07
®
MOUNT
DISCHARGE
SENSOR HERE
HEAT
EXCHANGER
BLOWER
Fig. 14.
M32995
IAQ WITH EIM
Selecting Thermostat Location
Install the thermostat about 5 ft. (1.5m) above the floor in an
area with good air circulation at average temperature. See
Fig. 16.
NO
M33079A
Fig. 16. Selecting thermostat location.
Do not install the thermostat where it can be affected by:
— Drafts or dead spots behind doors and in corners.
— Hot or cold air from ducts.
— Radiant heat from sun or appliances.
— Concealed pipes and chimneys.
— Unheated (uncooled) areas such as an outside wall
behind the thermostat.
Installing Wallplate
CAUTION
Electrical Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power before wiring.
The thermostat can be mounted horizontally on the wall or
on a 4 in. x 2 in. (101.6 mm x 50.8 mm) wiring box.
1. Separate wallplate from thermostat.
1324
Fig. 17. Separate wallplate from thermostat (THX9421).
2. Position and level the wallplate (for appearance
only).
3. Use a pencil to mark the mounting holes.
12
NO
YES
NO
5 FEET
[1.5 METERS]
M19925
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