Installing A New Thermostat - Johnson Controls Hx 3 S1-THXU430W Installation Manual

5407934-UIM-C-1119
Voltage Hazard: Live wires can cause electrical shock or equipment
damage. Disconnect power before beginning installation.
Follow these steps:
1. Turn off all power to the indoor and outdoor equipment.
2. If an existing thermostat is being replaced:
a. Disconnect the wires from the existing thermostat.
b. Remove the existing thermostat from the wall.
c. Properly discard or recycle the old thermostat.
Mercury is a hazardous substance. If the existing thermostat contains
any mercury, it MUST be disposed of properly. This thermostat does
not contain mercury.
3. Mark where the thermostat is to be mounted on the wall (standard
height is 5 ft from the floor).
If a thermostat was formerly in place, evaluate the location to make
sure it meets the location requirements outlined earlier in this docu-
ment.

INSTALLING A NEW THERMOSTAT

1. Position the thermostat base against the wall and determine if it com-
pletely covers the footprint of the current thermostat.
2. Position the thermostat base against the wall (or wall plate if used)
and determine if the new screw locations align with prior locations.
3. If the thermostat base does not align with the existing anchor holes,
mark the new screw locations with a pencil.
• Drywall: Drill a 3/16 in. hole for the anchor and install.
• Plaster: Drill a 7/32 in. hole for the anchor and install.
4. If the remote sensor is to be used, pull the wires through and connect
them to the S1 and S2 terminals. Use the ambient sensor (S1-
02542683000), which you can purchase separately.
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Johnson Controls Ducted Systems