® U.S. Registered Trademark
Copyright © American Standard Inc. 1999
INSTALLER'S GUIDE
XT300C Deluxe Programmable
Heat-Cool Thermostat
18-HD25D1-3
APPLICATION
The XT300C Deluxe Programmable Heat-Cool Thermostat provides electronic control of 24 Vac single-stage heating and
cooling systems. Refer to Table 1 for a general description of the thermostat. This thermostat is powered by the heating system
only. Refer to Wiring for information on wiring for cooling-only applications.
Table 1. Description of XT300C
RECYCLING NOTICE
If this thermostat is replacing a thermostat that contains
mercury in a sealed tube, do not place your old
thermostat in the trash.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of the old thermostat.
INSTALLATION
When Installing this Thermostat...
1. Read these instructions carefully. Failure to follow the
instructions can damage the product or cause a
hazardous condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instructions
to check out the product operation.
Location
Install the thermostat about 5 ft (1.5m) above the floor in an
area with good air circulation at average temperature. See
Fig. 1. Avoid installing the thermostat where it can be affected
by the following:
•
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.
Wallplate Installation
Position wallplate horizontally on the wall or on a 2 in. x 4 in.
wiring box.
1. Position and level the wallplate for appearance only (the
thermostat will function properly even when
not level).
Fig. 1. Typical location of thermostat.
5 FEET
[1.5 METERS]
YES
NO
NO
NO
M17106
69-1212-1
Model
System
Changeover
System
Selection
Fan
Selection
Comments
XT300C Heat-Cool
Automatic
Heat-Off-Cool -
Auto
On-Auto
System and fan selections are done by
keyboard.
