Trane XT300C Assembly instructions

® 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.

2
XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
69-1212—1
Pub. No. 18-HD25D1-3
Fig. 2. Mounting the wallplate.
2. Use a pencil to mark the mounting holes. See Fig.2.
3. Remove the wallplate from the wall and drill two 3/16
inch holes in the wall (if drywall) as marked.For firmer
material such as plaster, drill two 7/32 inch holes.
Gently tap anchors (provided) into the drilled holes until
flush with the wall.
4. Position the wallplate over the holes, pulling wires
through the wiring opening.
5. Loosely insert the mounting screws into the holes.
6. Tighten mounting screws.
WIRING
All wiring must comply with local electrical codes and
ordinances. Refer to Fig.3 for typical hookup diagram. A letter
code is located near each terminal for identification.
WARNING
Electric Shock or Equipment Damage Hazard.
Can shock individuals or cause equipment
damage.
Disconnect power before wiring to prevent electrical
shock or equipment damage.
1. Loosen the terminal screws on the wallplate and
connect the system wires. See Fig. 4.
NOTE: Use 18 gauge, color-coded thermostat cable for
proper wiring.
2. Securely tighten each terminal screw.
3. Push excess wire back into the hole.
4. Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.
WIRES
THROUGH WALL
WALL
MOUNTING
HOLES
M15044
MOUNTING
SCREWS
WALL
ANCHORS
(2)
M4826
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
Fig. 3.Typical hookup of XT300C in a heat-cool
system with one transformer.
Fig. 4. Proper wiring technique.
Cooling-Only Applications
The XT300C is only powered through the heating system.
Cooling-only applications require a simulated heating load
from the W terminal (see Fig.3) to the transformer common.
Without this simulated load, the thermostat will not operate.
Mounting Thermostat
1. Engage tabs at the top of the thermostat and wallplate.
See Fig. 5.
2. Press lower edge of case to close and latch.
NOTE: To remove thermostat from wall, first pull out at
bottom of thermostat; remove top last.
Fig. 5. Mounting thermostat on wallplate.
G
L1
L2
M17114
FAN
RELAY
HUMIDISTAT
OPENS
ON RISE
TAYSTAT253A
Y R
COMPRESSOR
CONTACTOR 1
TRANSFORMER
HH
OUTDOOR
TEMPERATURE
SENSOR
TAYSENS100A
WOT OT
1POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
HEAT
RELAY 1
YELLOW
GREEN
WHITE
RED
M17109
PRESS LOWER
EDGE OF CASE
TO LATCH.
ENGAGE TABS
AT TOP OF
THERMOSTAT
AND WALLPLATE.
A.
B.

XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
369-1212—1
Pub. No. 18-HD25D1-3
Using Thermostat Keys
The thermostat keys are used to:
• Set current day and time,
• Program times and setpoints for heating and cooling,
• Temporarily override program temperatures,
• Display present setting,
• Configure Installer Setup,
• Check Self-Test,
• Display outdoor temperature (optional accessory),
• Set the system operation, and
• Set the fan operation.
See Fig. 6 for keypad explanation.
SETTINGS
System and Fan Settings
The system default setting is Heat and the fan default setting
is Auto.Use the System and Fan keys to change the
settings.See Figs. 7 and 8.The fan settings can be set for
each program period individually.The system selection is for
all the program periods.
System settings control the thermostat operation as follows:
Heat:The thermostat controls the heating.
Off: Both the heating and cooling are off.
Cool:The thermostat controls the cooling.
Auto:The thermostat automatically changes between
heating and cooling operation, depending on the indoor
temperature.
Time Set Program
SystemFilter Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
INCREASE TEMPERATURE SETTING OR SCROLL
FORWARD THROUGH INSTALLER SETUP OPTIONS DECREASE
TEMPERATURE
SETTING OR
SCROLL BACKWARD
THROUGH INSTALLER
SETUP OPTIONS
DISPLAY
INFORMATION
SUCH AS PRESENT
SETTINGS
AND OUTDOOR
TEMPERATURE
RETURN TO NORMAL
OPERATIONS
ENTER INDEFINITE
OR TIMED HOLD MODE
SET CURRENT
DAY AND TIME
SET CURRENT OR
PROGRAM DAY
CHANGE BETWEEN
DAYLIGHT SAVINGS
AND STANDARD TIME
INCREASE TIME
SETTING OR SCROLL
FORWARD THROUGH
INSTALLER SETUP
AND SYSTEM TEST
DECREASE TIME SETTING
OR SCROLL BACKWARD
THROUGH INSTALLER
SETUP AND SYSTEM TEST
COPY ONE
PROGRAMMED DAY
TO ANOTHER DAY
SET WAKE TIMES
AND SETPOINTS
CHANGE BETWEEN
HEATING AND
COOLING SETPOINTS
SET LEAVE TIMES
AND SETPOINTS
SET RETURN TIMES
AND SETPOINTS
SET SLEEP TIMES
AND SETPOINTS
M17118
SELECT SYSTEM
OPERATION (HEAT,
COOL, OFF, AUTO)
SELECT FILTER
EXPIRATION IN
NUMBER OF DAYS
SELECT FAN
OPERATION
Time Set Program
SystemFilter Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
M12957
Fan
Auto
Fan On
Time Set Program
SystemFilter Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
M12956
System System
Heat
Off Auto Cool
Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto:Fan operates with equipment.
Fig. 6. XT300C key locations and descriptions.
Fig. 7. System key location and display.
Fig. 8. Fan key location and display.
NOTE: Always press the keys with your fingertip or similar
blunt tool.Sharp instruments like a pen or pencil
point can damage the keyboard.
Temperature Settings
Refer to Table 2 for the default program. For 7-Day and 24-
Hour Operation, the settings are the same for each day of
the week. Refer to the Owners Guide, Pub. No. 22-5127-04,
for instructions on changing the default settings.
Table 2. Default Program Settings.
Period Time Heat Setpoint Cool Setpoint Fan Setting
Wake 6:00 AM 70°F
(21°C) 78°F (25.5°C) Auto
Leave 8:00 AM 62°F
(16.5°C) 85°F (29.5°C) Auto
Return 5:00 PM 70°F
(21°C) 78°F (25.5°C) Auto
Sleep 10:00 PM 62°F
(16.5°C) 82°F (28°C) Auto

4
XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
69-1212—1
Pub. No. 18-HD25D1-3
The Leave, Return and Sleep periods may be cleared.For
example, the daytime energy-savings period (from Leave to
Return) may not be used by the homeowner.To clear any
period, follow the instructions in the Owners Guide in the
Clearing Schedule Period section.
INSTALLER SETUP
The Installer Setup is used to customize the thermostat for
specific systems. Some of the options include Comfort-R™
control activation, Fahrenheit vs.Centigrade temperature
display, outdoor temperature display (requires outdoor
sensor installation), and system changeover. Installer Setup
numbers are listed in Table 3.The table includes all the
configuration options and the factory-settings for the
XT300C Deluxe Programmable Heat-Cool Thermostat .
NOTE: For most applications, the thermostat factory-
settings apply. Review the factory settings in Table 2
and if no changes are necessary, go to the Installer
Self-Test section.
IMPORTANT
The chart CustomizingYour Thermostat found in the
beginning of the Owners Guide (see Fig. 9) must be
completed.The homeowner identifies the options
you install by referring to this chart.
Figure 9. CustomizingYourThermostat chart,
from Owners Guide, Pub. No. 22-5127-04.
Fig. 10. Display of all the segments of the LCD.
Fig. 11. Display of Installer Setup number and option.
— To advance to the next Installer Setup, press Time ▲▲.
— To change a setting, press Increase ▲or Decrease ▼.
— To scroll the Installer Setup numbers backwards, press
Time ▼▼.
— To exit the Installer Setup, press Run Program.
CAUTION
Equipment Damage Hazard.
Can cause permanent equipment damage.
Electric heat systems must be configured to 1 in
Installer Setup number 2 to prevent equipment
damage caused by the system running without
the fan.
M10349
INSTALLER SETUP
NUMBER DISPLAY
(COLUMN 2 OF TABLE 3)
FACTORY SETTING OR OTHER
CHOICE DISPLAY (COLUMN 3
OR 5 OF TABLE 3)
Comfort-R™
CONTROL OFF ON
AUTO ONLY
(SYSTEM
AUTOMATICALLY
SELECTS HEAT
OR COOL)
PROGRAMMING
OUTDOOR
TEMPERATURE
DISPLAY
SYSTEM
SETTING
(HEATING
AND
COOLING
SETTING)
CLOCK
FORMAT
TEMPERATURE
DISPLAY
COOLING
DROOP
Adaptive
Intelligent
Recovery™
CONTROL
(A HONEYWELL
TRADEMARK)
7-DAY
PROGRAMMING
NO OUTDOOR
TEMPERATURE
IS DISPLAYED
AUTO/MANUAL
(SYSTEM
AUTOMATICALLY
SELECTS
HEAT OR COOL;
YOU CAN
SELECT HEAT,
COOL OR OFF.)
24-HOUR
CLOCK FORMAT
FARENHEIT (°F)
ON
ON
24-HOUR
PROGRAMMING
NO OUTDOOR
TEMPERATURE
IS DISPLAYED
MANUAL ONLY
(YOU SELECT
HEAT, COOL
OR OFF.)
24-HOUR
CLOCK FORMAT
CENTIGRADE (°C)
OFF
OFF
(CONVENTIONAL
RECOVERY)
CONSTANT
TEMPERATURE
SETPOINT
PROGRAMMING
M17110
Aux Ht
Heat
Auto
System Fan
Off Auto
Wake
Mon
Wait
In
Room
Outdoor
Auto
Sav
AM
PM
Hold for
Cool Repl Batt
On
Recovery
DST
Cool
TueWedThuFriSatSun
LeaveReturnSleep
M17111
Set Program Set Day/Time Start Time Temporary Setting Enrg
Em Heat
Em Ht
Installer Setup Procedure
1. Press and hold the Information , Increase ▲,
and Decrease ▼keys at the same time until all display
segments and the first setup number displays
(all display segments appear for approximately three
seconds before the setup number displays).See
Figs.10 and 11.

XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
569-1212—1
Pub. No. 18-HD25D1-3
IMPORTANT
Only configurable numbers display.Example: Installer Setup Number 1 does not display because it is not configurable.
Review the factory settings in Table 3 and make any desired changes in the Actual Settings column.When the Installer
Setup is complete, review the settings to confirm that they match the system and the boxes you checked in the
CustomizingYour Thermostat chart located in the Owners Guide.
Table 3. Installer Setup Options for the XT300C.
(continued)
Press Time
▲ or ▼ Press Increase ▲or Decrease ▼to change setting
Installer Factory Setting Other Choices Actual
Select Setup Number Display Description Display Description Setting
Programming 42
Press Time ▼to
bypass 3–41 and
go directly to
setup #42
0 7-day programming 1 or 2 1—24-hour programming
2—No programming
Fan operation 2 0 Conventional applica-
tions where
equipment controls
fan operation in heat
mode
1 Heat pump or electric heat
applications where
thermostat controls fan
operation in heat mode
Heating cycle
rate 4 5 5—5 cph
recommended
3, 6 or 9 cph not
recommended
3, 6 or 9 3—3 cph
6—6 cph
9—9 cph
Cooling cycle
rate 9 3 3—3 cph recommended
2 or 5 cph not
recommended
2 or 5 2—2 cph
5—5 cph
System setting
adjustment 12 0 Auto changeover 1 or 2 1—Manual changeover 2—Auto changeover only
Adaptive
Intelligent
Recovery™
control
13 0 Adaptive Intelligent
Recovery (a
Honeywell trademark)
control is activated
(system starts early so
setpoint is reached by
start of program
period)
1 Conventional recovery
(system starts recovery at
programmed time)
Degree
temperature
display
14 0 Temperature displays
in °F1 Temperature displays in °C
Clock format 16 0 12-hour clock format 1 24-hour clock format
Extended fan
operation in
heating
a
19 0 No extended fan
operation after the call
for heat ends
1, 2 or 3 1—Fan operation extends
30 seconds after the call
ends.
2—Fan operation extends
60 seconds after the call
ends.
3 —Fan operation extends
90 seconds after the call
ends.
Extended fan
operation in
cooling
20 0 No extended fan
operation after the call
for cool ends
1, 2 or 3 1—Fan operation extends
30 seconds after the call
ends.
2—Fan operation extends
60 seconds after the call
ends.
3 —Fan operation extends
90 seconds after the call
ends.

6
XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
69-1212—1
Pub. No. 18-HD25D1-3
Table 3. Installer Setup Options for the XT300C (Continued) .
(continued)
Press Time
▲ or ▼ Press Increase ▲or Decrease ▼to change setting
Installer Factory Setting Other Choices Actual
Select Setup Number Display Description Display Description Setting
Outdoor
temperature
display (select
models)
24 0 No outdoor
temperature displays 1 Outdoor temperature displays. Requires a
TAYSENS100A Outdoor
Sensor.
Comfort-R
Enable 28 0 No fan delay 1 or 2 1—30 seconds 2—15 seconds
Minimum
Deadband
Between
Heating and
Cooling in Auto
Changeover
Mode
30 4 Heating and cooling
setpoints can be set
no closer than 4°F
(2°C)
3 thru 10 Heating and cooling
setpoints can be set no
closer than the chosen
value:
3—3°F (1.5°C)
4—4°F (2°C)
5—5°F (2.5°C)
6—6°F (3°C)
7—7°F (3.5°C)
8—8°F (4°C)
9—9°F (4.5°C)
10—10°F (5°C)
Minimum On
Time (Heat) 32 5 5-minute minimum on time for compressor 0 thru 15 Minimum number of minutes (0 thru 15) the compressor
will be on during call for
heat
Minimum On
Time (Cool) 33 10 10-minute minimum on time for compressor 0 thru 15 Minimum number of minutes (0 thru 15) the compressor
will be on during call for
cool
Temperature
range stops in
heating
34 85 Highest setpoint
heating can be set to 55 to 85 Temperature range (1°F increments) heating
setpoint can be set to
Temperature
range stops in
cooling
35 65 Lowest setpoint
cooling can be set to 65 to 99 Temperature range (1°F increments) cooling
setpoint can be set to
Temperature
display
adjustment
37 0 No difference in
displayed temperature
and actual room
temperature
3, 2, 1, -1,
-2, or
-3
3—Display adjusts to 3°F
higher than actual room
temperature
2—Display adjusts to 2°F
higher than actual room
temperature
1—Display adjusts to 1°F
higher than actual room
temperature
-1—Display adjusts to 1°F
lower than actual room
temperature
-2—Display adjusts to 2°F
lower than actual room
temperature
-3—Display adjusts to 3°F
lower than actual room
temperature
Minimum Off
Time (Heat) 38 5 5 minute minimum off time for equipment 0 thru 15 Minimum number of minutes (0 thru 15) the equipment
will be off between calls for
heat

XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
769-1212—1
Pub. No. 18-HD25D1-3
Table 3. Installer Setup Options for the XT300C
(Continued) .
M12951
Set Current
Day/Time Mon
PM
Set Day/Time
Time Set Program
SystemFilter Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
IMPORTANT
Review the settings to confirm that they match the system.Press Run Program to exit the Installer Setup.The
thermostat saves the Installer Setup changes and initiates a reset in order to operate using the new settings.
NOTE: For initial installations only, set the current day and time following the setup reset.
NOTE: Sun=Sunday, Mon=Monday, Tue=Tuesday,
Wed=Wednesday, Thu=Thursday, Fri=Friday,
Sat=Saturday.
Setting Current Day and Time
1. Press Set Current Day/Time.
NOTE: On initial power up or after an extended power loss,
1:00 pm flashes on the display until a key is pressed.
2. Press Day until the current day displays.
Time Set Program
SystemFilter Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
M12952
Day
PM
Tue
Set Day/Time
Time Set Program
SystemFilter Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
M12954
Daylight
Time
AM
DST
Tue
Set Day/Time
M12955
Run
Program Auto
System Fan
Wake
Room
AM
DST
Tue
Heat
Time Set Program
SystemFilter Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
Time Set Program
SystemFilter Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
M12953
Time
AM
Tue
Set Day/Time
time in one hour increments.
NOTE: If the current time is Daylight Savings Time, press
DaylightTime until DST displays.
4. Press Run Program.
3. Press Time ▲or Time ▼until the current time displays.
NOTE: Tapping the Set Current Day/Time will change the
Press Time
▲ or ▼ Press Increase ▲or Decrease ▼to change setting
Installer Factory Setting Other Choices Actual
Select Setup Number Display Description Display Description Setting
Minimum Off
Time (Cool) 39 5 5 minute minimum off time for equipment 0 thru 15 Minimum number of minutes (0 thru 15) the equipment
will be off between calls for
cool
Cooling Droop 41 1 Cooling droop
activated 0 No cooling droop
Programming 42
Press Time ▼to
bypass 2–41 and
go directly to
setup #42
0 7-day programming 1 or 2 1—24-hour programming
2—No programming

8
XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
69-1212—1
Pub. No. 18-HD25D1-3
INSTALLER SELF-TEST
Use the Installer Self-Test to check the thermostat operation.
Refer to Table 4 for a list of the available self-tests.
CAUTION
Equipment Damage Hazard.
Equipment damage can occur if the compressor
is cycled too quickly.
The minimum off time is deactivated during the
Installer Self-Test.
Perform the test so that the compressor is cycled
slowly.
To start the self-test:
Press and hold the Increase ▲and Decrease ▼keys at the
same time until all display segments and the number 10
appears (all displays segments appear for approximately
three seconds before the test number displays).See
Figs.13 and 14.
Table 4.Tests Available InThe Installer Self-Test.
Aux Ht
Heat
Auto
System Fan
Off Auto
Wake
Mon
Wait
In
Room
Outdoor
Auto
Sav
AM
PM
Hold for
Cool Repl Batt
On
Recovery
DST
Cool
TueWedThuFriSatSun
LeaveReturnSleep
M17111
Set Program Set Day/Time Start Time Temporary Setting Enrg
Em Heat
Em Ht
M10257A
TEST NUMBER
Fig. 14. Display of test number.
Refer toTable 5 for the directions and results of the specific tests.
Fig. 13. Display of all the segments of the LCD.
NOTE: Press Time ▲▲to advance to the next test and Time ▼▼to go back to the previous test.Press Run Program to exit the
self-test.This mode times out 5 minutes after the last key press.
Table 5. Installer Self-Test Options.
(
continued )
Test
Number Self-Test Description
10 Heating Equipment
30 Cooling Equipment
40 Fan Equipment
50 Comfort-R Terminals (H-H)
60 Keyboard Operation
70 Device Information
Key to
Press Test Number Description
Heating Equipment Self-Test (10)
Time ▲10 Enter heating equipment self-test.
Temp ▲11 First stage heat turns on. When Installer Setup number 2 is 1, the system fan is also energized.
Temp ▼10 First stage heat turns off.
Cooling Equipment Self-Test (30)
Time ▲30 Enter cooling equipment self-test.
Temp ▲ 31 First stage cool and fan turn on.
Temp ▼30 First stage cool and fan turn off.
Fan Equipment Self-Test (40)
Time ▲40 Enter fan equipment self-test.
Temp ▲41 Fan turns on.
Temp ▼40 Fan turns off.
Comfort-R Terminals Self-Test (50)
Temp ▲50 Enter Comfort-R self-test.
Temp ▼51 Reads HH terminals. If the terminals are open and Comfort-R is enabled, display reads
% humidity. If the terminals are closed no % humidity displays.

XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
969-1212—1
Pub. No. 18-HD25D1-3
Table 5. Installer Self-Test Options (Continued).
NOTE: Press Time ▼▼to return to the previous test or Time ▲▲to advance to the next test.
NOTE: To exit, press Time ▲▲or Time ▼▼then Run Program.
Key to
Press Test Number Description
Keyboard Operation Self-Test (60)
Time ▲60 7 Enter keyboard operation self-test.
Temp ▲60 9 Increase test number displays.
Temp ▼60 8 Decrease test number displays.
Day 60 11 Day test number displays.
Copy 60 12 Copy test number displays.
System
(select
models)
60 3 System test number displays.
Fan
(select
models)
60 10 Fan test number displays.
Set
Current
Day/Time
60 1 Set Current Day/Time test number displays.
Run
Program 60 15 Run Program test number displays.
Daylight
Time 60 19 Daylight Time test number displays.
Heat/
Cool
Settings
60 5 Heat/Cool Settings test number displays.
Wake 60 0 Wake test number displays.
Leave 60 14 Leave test number displays.
Return 60 16 Return test number displays.
Sleep 60 2 Sleep test number displays.
Filter 60 17 Filter test number displays.
i 60 13 Information test number displays.
Device Information Self-Test (70) - Refer to following section.

10
XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
69-1212—1
Pub. No. 18-HD25D1-3
DEVICE INFORMATION
SELF-TEST (70)
1. Press Temp ▲and ▼keys simultaneously, then press
Time ▼▼to access the thermostat information.
2. Press Increase ▲to display the production date code
in a 3-digit format.The first two digits represent the
month and the third digit represents the last digit of the
year (Example: 128=December 1998).
3. Press Increase ▲again to display the software
identification code.
(Example: 200 = software ID code 200)
4. Press Increase ▲again to display the software revision
number (Example: 001=Revision number 1).
5. Press the Increase ▲again to display the model
identification number. (Example: 314 = Model ID 314)
6. Press Run Program to exit the self-test.The self-test
mode times out 5 minutes after the last key press.
CHECKOUT
Outdoor Temperature Sensor
(optional accessory)
Expose the outdoor temperature to outdoor air for a minimum
of five minutes before reading.
M4934
M17112
M17113
M10229
M4933A
TROUBLESHOOTING GUIDE
( continued )
Symptom Possible Cause Action
Display will not come
on. Thermostat is not being powered. Check for 24 Vac between R and W terminals. Check if the circuit breaker is tripped—reset the circuit breaker.
Check if the system fuse is blown—replace the fuse.
Check if the power switch on the HVAC equipment is in the Off
position—set to the On position.
Check wiring between thermostat and HVAC equipment—replace
any broken wires and tighten any loose connections.
If 24 Vac is present, proceed with troubleshooting.
Temperature display
is incorrect. Room temperature display has been reconfigured. Enter Installer Setup number 37 and reconfigure the display.
Thermostat is configured for
°F or °C display. Enter Installer Setup number 14 and reconfigure the display.
Bad thermostat location. Relocate the thermostat.
Temperature
displaying digits as
dashes (---).
Internal temperature
measurement failure. Contact distributor or retailer.
Temperature settings
will not change.
(Example:
The upper or lower
temperature limits were
reached.
Check the temperature setpoints:
Heating limits are 55 to 85°F (13 to 29°C).
Cooling limits are 65 to 99°F (18 to 37°C).
Cannot set the
heating higher or the
cooling lower.)
The setpoint temperature
range stops were configured. Check Installer Setup numbers 34 and 35 and reconfigure the setpoint stops.

XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
11 69-1212—1
Pub. No. 18-HD25D1-3
TROUBLESHOOTING ( C ONTINUED ).
Symptom Possible Cause Action
Heating will not come
on. No power to the thermostat. Check for 24 Vac between R and W terminals. If missing 24 Vac:
Check if the circuit breaker is tripped—reset the circuit breaker.
Check if the system fuse is blown—replace the fuse.
Check if the power switch on the HVAC equipment is in the
Off position—set to the On position.
Check wiring between thermostat and HVAC equipment—replace
any broken wires and tighten any loose connections.
If 24 Vac is present, proceed with troubleshooting.
Heating will not come
on. Thermostat minimum off time is activated. Wait up to five minutes for the system to respond.
System selection is not set to
Heat. Set system selection to Heat.
Heating setpoint is below room
temperature. Check heating setpoint. Set heating setpoint to desired temperature.
Cooling will not come
on. No power to the thermostat. Check for 24 Vac between R and Y terminals. If missing 24 Vac:
Check if the circuit breaker is tripped—reset the circuit breaker.
Check if the system fuse is blown—replace the fuse.
Check if the power switch on the HVAC equipment is in the
Off position—set to the On position.
Check wiring between thermostat and HVAC equipment—replace
any broken wires and tighten any loose connections.
If 24 Vac is present, proceed with troubleshooting.
Thermostat minimum off time is
activated. Wait up to five minutes for the system to respond. Enter Installer Setup number 39. Reconfigure minimum off time (if required).
System selection is not set to
Cool. Set system selection to Cool.
Cool setpoint is above room
temperature. Check cooling setpoint. Set cooling setpoint to desired temperature.
Heating or cooling
come on momen-
tarily and shut off
Heat or cool circuit is opening
up or becoming high
impedance.
Add resistor in parallel with load or install interface relay.
System on indicator
(flame=heat,
snowflake=cool)
Fan operation set for 0 (con-
ventional heat) when it should
be set for 1 (electric heat).
Enter Installer Setup number 2 and reconfigure the fan operation.
displays, but no
warm or cool air is
coming from the
registers.
Conventional heating
equipment turns on the fan
when the furnace has
warmed up to a setpoint.
Wait a minute after seeing the on indicator and then check the
registers.
Heating or cooling equipment
is not operating. Verify operation of heating or cooling equipment in self-test.
Outdoor temperature
not displayed Option not activated. Enter Installer Setup number 24 and set to 1. Thermostat must have OT terminals and a TAYSENS100A installed.
or is incorrect. Outdoor sensor is connected
incorrectly. Refer to TAYSENS100A installation instructions and check wiring between the thermostat and sensor.
Wrong sensor. Replace sensor with TAYSENS100A sensor.
Filter expired. Refer to the Filter Indication section in the Owner’s Guide, Pub.
No. 22-5127-04.
System on indicator
reads Filter and
backlight is flashing.
Filter expired. Refer to the Filter Indication section.
Time displaying digits
as three E’s (EEE). Internal memory failure. Contact distributor or retailer.

12
XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
69-1212—1
Pub. No. 18-HD25D1-3
69-1212—1 T. C. Rev. 3-99
American Standard Inc.
Troup Highway
Tyler, TX 75711-9010
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.