XT302C Deluxe Programmable
Heat-Cool Thermostat
18-HD25D7-5
INSTALLER'S GUIDE
APPLICATION
The XT302C Deluxe Programmable Heat-Cool Thermostat provides electrnic control of 24 Vac single-zone multistage systems.
Refer to Table 1 for a general description of the thermostat. This thermostat requires a common wire to supply power.
Table 1. Description of XT302C.
Model
System
Changeover System Selection Fan Selection
Automatic Heat-Off-Cool-Auto On-Auto
Comments
XT302C Multistage
System and fan selections are done by
keyboard.
Wallplate Installation
RECYCLING NOTICE
Position wallplate horizontally on the wall or on a 2 in. x 4 in.
wiring box.
If this thermostat is replacing a thermostat that
contains mercury in a sealed tube, do not place your
old thermostat in the trash.
1. Position and level the wallplate for appearance only (the
thermostat will function properly even when
not level).
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of the old thermostat.
INSTALLATION
YES
NO
When Installing this Thermostat...
1. Read these instructions carefully. Failure to follow the
instructions can damage the product or cause a
hazardous condition.
NO
5 FEET
[1.5 METERS]
NO
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.
M17106
Location
Fig. 1. Typical location of thermostat.
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.
® U.S. Registered Trademark
Copyright © American Standard Inc. 1999
69-1213-1
Download from Www.Somanuals.com. All Manuals Search And Download.
XT302C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
DECREASE
TEMPERATURE
SETTING OR
SET WAKE TIMES
AND SETPOINTS
INCREASE TEMPERATURE SETTING OR SCROLL
FORWARD THROUGH INSTALLER SETUP OPTIONS
SCROLL BACKWARD
THROUGH INSTALLER
SETUP OPTIONS
INCREASE TIME
SETTING OR SCROLL
FORWARD THROUGH
INSTALLER SETUP
AND SYSTEM TEST
DISPLAY
INFORMATION
SUCH AS PRESENT
SETTINGS
AND OUTDOOR
TEMPERATURE
SET CURRENT
DAY AND TIME
RETURN TO NORMAL
OPERATIONS
SET RETURN TIMES
AND SETPOINTS
SET CURRENT OR
PROGRAM DAY
Set Current
Day/Time
Run
Leave
Wake
Return
Sleep
Fan
SET SLEEP TIMES
AND SETPOINTS
Program
ENTER INDEFINITE
OR TIMED HOLD MODE
Set Program
Time
Copy
Heat/Cool
Settings
Hold Temp
Day
Filter
System
SET LEAVE TIMES
AND SETPOINTS
DECREASE TIME SETTING
OR SCROLL BACKWARD
THROUGH INSTALLER
Daylight
Time
SELECT FAN
OPERATION
SETUP AND SYSTEM TEST
CHANGE BETWEEN
DAYLIGHT SAVINGS
AND STANDARD TIME
COPY ONE
PROGRAMMED DAY
TO ANOTHER DAY
CHANGE BETWEEN
HEATING AND
COOLING SETPOINTS
SELECT FILTER
EXPIRATION IN
NUMBER OF DAYS
SELECT SYSTEM
OPERATION (HEAT,
COOL, OFF, AUTO)
M17118
Fig. 6. XT302C key locations and descriptions.
System settings control the thermostat operation as follows:
Using Thermostat Keys
The thermostat keys are used to:
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.
•
•
•
•
•
•
•
•
•
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.
Run
Set Current
Day/Time
Wake
Leave
Return
Sleep
Fan
Program
Time
Copy
Set Program
System
Heat/Cool
Settings
Hold Temp
Day
Filter
System
System
Heat Off Cool
Auto
See Fig. 6 for keypad explanation.
Daylight
Time
M12956
Fig.7. System key location and display.
SETTINGS
Fan settings control the system fan as follows:
On: Fan operates continuously.
System and Fan Settings
Auto: Fan operates with equipment.
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.
Run
Set Current
Day/Time
Wake
Leave
Return
Sleep
Fan
Program
Time
Copy
Set Program
Fan
Heat/Cool
Settings
Hold Temp
Day
Filter
System
Fan
OnAuto
Daylight
Time
M12957
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.
Pub. No. 18-HD25D7-5
69-1213—1 (T8624)
3
Download from Www.Somanuals.com. All Manuals Search And Download.
XT302C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
Temperature Settings
INSTALLER SETUP
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.
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
XT302C Deluxe Programmable Multistage Thermostat .
Table 2. Default Program Settings.
Heat
Setpoint
Cool
Setpoint
Fan
Setting
Period
Wake
Time
6:00 AM
70°F
(21°C)
78°F
Auto
Auto
Auto
Auto
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.
(25.5°C)
Leave
Return
Sleep
8:00 AM
5:00 PM
62°F
85°F
(29.5°C)
(16.5°C)
70°F
(21°C)
78°F
(25.5°C)
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.
10:00 PM 62°F
(16.5°C)
82°F
(28°C)
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 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. 11 and 12.
Comfort-R™
CONTROL
OFF
ON
ON
OFF
Adaptive
Intelligent
Recovery™
CONTROL
(CONVENTIONAL
RECOVERY)
(A HONEYWELL
TRADEMARK)
Temporary Setting Enrg
Sav
Set Program Start Time Set Day/Time
Hold for
Em Ht
AM
PM
COOLING
DROOP
ON
OFF
Room
Aux Ht
MonTueWedThuFriSatSun
Heat Cool
Outdoor
Auto Repl Batt
Fan
TEMPERATURE
DISPLAY
FARENHEIT (°F)
CENTIGRADE (°C)
WakeLeaveReturnSleep In Recovery
System
Heat OffCool Auto Wait
DST
24-HOUR
CLOCK FORMAT
24-HOUR
CLOCK FORMAT
CLOCK
FORMAT
OnAuto
Em
M17111
SYSTEM
SETTING
(HEATING
AND
COOLING
SETTING)
MANUAL ONLY
(YOU SELECT
HEAT, COOL
OR OFF.)
AUTO ONLY
(SYSTEM
AUTOMATICALLY
SELECTS HEAT
OR COOL)
AUTO/MANUAL
(SYSTEM
AUTOMATICALLY
SELECTS
HEAT OR COOL;
YOU CAN
Fig. 10. Display of all the segments of the LCD.
SELECT HEAT,
COOL OR OFF.)
OUTDOOR
TEMPERATURE
DISPLAY
NO OUTDOOR
TEMPERATURE
IS DISPLAYED
NO OUTDOOR
TEMPERATURE
IS DISPLAYED
FACTORY SETTING OR OTHER
CHOICE DISPLAY (COLUMN 3
INSTALLER SETUP
NUMBER DISPLAY
(COLUMN 2 OF TABLE 3)
CONSTANT
TEMPERATURE
SETPOINT
PROGRAMMING
7-DAY
PROGRAMMING
24-HOUR
PROGRAMMING
OR 5 OF TABLE 3)
M10349
M17110
PROGRAMMING
Fig. 11. Display of Installer Setup number and option.
Figure 9. CustomizingYour Thermostat chart,
from Owners Guide, Pub. No. 22-5127-04.
Pub. No. 18-HD25D7-5
69-1213—1 (T8624)
4
Download from Www.Somanuals.com. All Manuals Search And Download.
XT302C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
IMPORTANT
Only configurable numbers display. Example: Installer
—
—
—
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 ▼.
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.
—
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.
Table 3. Installer Setup Options for the XT302C.
Press Time
▲ or ▼
Installer
Press Increase ▲ or Decrease ▼ to change setting
Factory Setting Other Choices
Display Description Description
Actual
Setup Number
Setting
Select
Display
Programming
42
0
7-day programming
1 or 2
1—24-hour programming
2—No programming
Press Time ▼ to
bypass 2–41
and go directly
to setup #42
Fan operation
2
0
Conventional
1
Applications where
thermostat controls fan
operation in heat mode
applications where
equipment controls
fan operation in heat
mode
Number of
heating Stages
3
4
2
3
2 heating stages
0 or 1
0—no heating
1—1 heating stage
Stage 1 heating
3—3 cph
recommended 5, 6, or
9 cph not
5, 6, or 9 5—5 cph
6—6 cph
rate
cycle
9—9 cph
recommended
Stage 2 heating
rate
5
8
5
5—5 cph
3, 6, or 9 3—3 cph
6—6 cph
cycle
recommended
3, 6, or 9 cph not
recommended
9—9 cph
Number of
Cooling Stages
1
3
1 cooling stage
0 or 2
2 or 5
0—no cooling
2—2 cooling stages
Stage 1 cooling 9
cycle rate
3—3 cph
2—2 cph
5—5 cph
recommended
2 or 5 cph not
recommended
Stage 2 cooling 10
cycle rate
3
0
3—3 cph
2 or 5
1 or 2
2—2 cph
5—5 cph
recommended
2 or 5 cph not
recommended
System setting 12
adjustment
Auto changeover
1—Manual changeover
2—Auto changeover only
(continued)
Pub. No. 18-HD25D7-5
69-1213—1 (T8624)
5
Download from Www.Somanuals.com. All Manuals Search And Download.
XT302C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
Table 3. Installer Setup Options for the XT302C (continued).
Press Time
▲ or ▼
Installer
Press Increase ▲ or Decrease ▼ to change setting
Factory Setting Other Choices
Display Description Description
Actual
Setup Number
Setting
Select
Adaptive
Intelligent
Recovery™
control
Display
13
0
Adaptive Intelligent
Recovery (a
1
Conventional recovery
(system starts recovery at
programmed time)
Honeywell trademark)
control is activated
(system starts early so
setpoint is reached by
start of program
period)
Degree
temperature
display
14
0
Temperature displays
in °F
1
1
Temperature displays in °C
Clock format
16
19
0
0
12-hour clock format
24-hour clock format
Extended fan
operation in
No extended fan
operation after the call
for heat ends
1, 2 or 3 1—Fan operation extends
30 seconds after the call
ends.
a
heating
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.
Outdoor
24
0
No outdoor
temperature displays
1
Outdoor temperature
displays. Requires a
TAYSENS100A Outdoor
Sensor.
temperature
display (select
models)
Comfort-R
Enable
28
30
0
4
No fan delay
1 or 2
1—30 seconds
2—15 seconds
Minimum
Deadband
Between
Heating and
Cooling in Auto
Changeover
Mode
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 0 thru 15 Minimum number of minutes
time for compressor
(0 thru 15) the compressor
will be on during call for
heat
(continued)
Pub. No. 18-HD25D7-5
69-1213—1 (T8624)
6
Download from Www.Somanuals.com. All Manuals Search And Download.
XT302C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
Table 3. Installer Setup Options for the XT302C (continued).
Press Time
▲ or ▼
Installer
Press Increase ▲ or Decrease ▼ to change setting
Factory Setting Other Choices
Description Description
10-minute minimum on 0 thru 15 Minimum number of minutes
Actual
Setup Number
Setting
Select
Display
Display
Minimum On
Time (Cool)
33
10
time for compressor
(0 thru 15) the compressor
will be on during call for
cool
Temperature
range stops in
heating
34
35
37
85
65
0
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
Lowest setpoint
cooling can be set to
65 to 99 Temperature range (1°F
increments) cooling
setpoint can be set to
Temperature
display
adjustment
No difference
in displayed
temperature and
actual room
3, 2, 1, -1, 3—Display adjusts to 3°F
-2, or
-3
higher than actual room
temperature
2—Display adjusts to 2°F
higher than actual room
temperature
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
39
5
5
5 minute minimum off 0 thru 15 Minimum number of minutes
time for the
compressor
(0 thru 15) the compressor
will be off between calls for
heat
Minimum Off
Time (Cool)
5 minute minimum off 0 thru 15 Minimum number of minutes
time for the
compressor
(0 thru 15) the compressor
will be off between calls for
cool
Cooling Droop 41
1
0
Cooling droop
activated
0
No cooling droop
Programming
42
7-day programming
1 or 2
1—24-hour programming
2—No programming
Press Time ▼ to
bypass 2–41
and go directly
to setup #42
IMPORTANT
Setting Current Day and Time
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.
1. Press Set Current Day/Time.
Set Day/Time
PM
Run
Program
Set Current
Day/Time
Wake
Leave
Return
Sleep
Fan
Mon
Set Current
Day/Time
Time
Copy
Set Program
Heat/Cool
Settings
Hold Temp
Day
Filter
System
NOTE: For initial installations only, set the current day and
time following the setup reset.
Daylight
Time
M12951
NOTE: On initial power up or after an extended power loss,
1:00 pm flashes on the display until a key is pressed.
Pub. No. 18-HD25D7-5
69-1213—1 (T8624)
7
Download from Www.Somanuals.com. All Manuals Search And Download.
XT302C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
2. Press Day until the current day displays.
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. 12 and 13.
Set Day/Time
PM
Run
Set Current
Day/Time
Wake
Leave
Return
Sleep
Fan
Tue
Program
Time
Copy
Set Program
Day
Heat/Cool
Settings
Hold Temp
Day
Filter
System
Daylight
Time
M12952
NOTE: Sun=Sunday, Mon=Monday, Tue=Tuesday,
Table 4.Tests Available InThe Installer Self-Test.
Wed=Wednesday, Thu=Thursday, Fri=Friday,
Sat=Saturday.
Test
Number
Self-Test Description
Heating Equipment
3. Press Time ▲ or Time ▼ until the current time displays.
10
Time
30
Cooling Equipment
Fan Equipment
Set Day/Time
AM
40
Run
Set Current
Day/Time
Leave
Return
Sleep
Fan
Tue
Wake
Program
Time
Copy
Set Program
Heat/Cool
Settings
50
Comfort-R Terminals (H-H)
Keyboard Operation
Device Information
Hold Temp
Day
Filter
System
Daylight
Time
M12953
60
70
NOTE: Tapping the Set Current Day/Time will change the
time in one hour increments.
NOTE: If the current time is Daylight Savings Time, press
Temporary Setting Enrg
Set Program Start Time Set Day/Time
DaylightTime until DST displays.
Sav
Hold for
Em Ht
AM
PM
Room
Aux Ht
Set Day/Time
Mon
TueWedThuFriSatSun
Heat Cool
Outdoor
AM
WakeLeaveReturnSleep In Recovery
Auto Repl Batt
Fan
Run
Set Current
Day/Time
System
DST
Wake
Leave
Return
Sleep
Fan
Tue
Daylight
Time
Pror
Time
Copy
Set Program
Heat/Cool
Settings
Hold Temp
ay
Filter
System
OffCool Auto Wait
OnAuto
Em Heat
DST
Daylight
Time
M17111
M12954
Fig. 12. Display of all the segments of the LCD.
4.
Press Run Program.
AM
Room
Run
Set Current
Day/Time
Tue
Wake
System
Heat
Wake
Leave
Return
Sleep
Fan
Run
Program
Program
Time
Copy
Set Program
Heat/Cool
Settings
Hold Temp
Day
Filter
System
DST
Fan
Auto
Daylight
Time
M12955
M10257A
TEST NUMBER
INSTALLER SELF-TEST
Fig. 13. Display of test number.
Use the Installer Self-Test to check the thermostat operation.
Refer to Table 4 for a list of the available self-tests.
Refer to Table 5 for the directions and results of the specific tests.
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.
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.
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.
Pub. No. 18-HD25D7-5
69-1213—1 (T8624)
8
Download from Www.Somanuals.com. All Manuals Search And Download.
XT302C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
Table 5. Installer Self-Test Options.
Key to
Press
Test
Number
Description
Heating Equipment Self-Test (10)
Time ▲
Temp ▲
Temp ▲
Temp ▼
Temp ▼
10
11
12
11
10
Enter heating equipment self-test.
First stage heat turns on. When Installer Setup number 2 is 1, the system fan is also energized.
Second stage heat turns on.
Second stage heat turns off.
First stage heat turns off.
Cooling Equipment Self-Test (30)
Time ▲
Temp ▲
Temp ▲
Temp ▲
Temp ▼
30
31
32
31
30
Enter cooling equipment self-test.
First stage cool and fan turn on.
Second stage cool turns on.
Second stage cool turns off.
First stage cool and fan turn off.
Fan Equipment Self-Test (40)
Time ▲
Temp ▲
Temp ▼
40
41
40
Enter fan equipment self-test.
Fan turns on.
Fan turns off.
Comfort-R Terminals Self-Test (50)
Temp ▲
50
51
Enter Comfort-R self-test.
Temp ▼
Reads HH terminals. If the terminals are open and Comfort-R is enabled, display reads
% humidity. If the terminals are closed no % humidity displays.
Keyboard Operation Self-Test (60)
Time ▲
Temp ▲
Temp ▼
Day
60 7
60 9
60 8
60 11
60 12
60 3
60 10
60 1
Enter keyboard operation self-test.
Increase test number displays.
Decrease test number displays.
Day test number displays.
Copy
Copy test number displays.
System
Fan
System test number displays.
Fan test number displays.
Set
Set Current Day/Time test number displays.
Current
Day/Time
Run
Program
60 15
60 19
Run Program test number displays.
Daylight Time test number displays.
Heat/Cool Settings test number displays.
Daylight
Time
Heat/ Cool 60 5
Settings
Wake
Leave
Return
Sleep
Filter
i
60 0
Wake test number displays.
Leave test number displays.
Return test number displays.
Sleep test number displays.
Filter test number displays.
Information test number displays.
60 14
60 16
60 2
60 17
60 13
Device Information Self-Test (70) - Refer to following section.
Pub. No. 18-HD25D7-5
69-1213—1 (T8624)
9
Download from Www.Somanuals.com. All Manuals Search And Download.
XT302C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
4. Press Increase ▲ again to display the software revision
DEVICE INFORMATION
SELF-TEST (70)
number (Example: 001=Revision number 1).
1. Press Temp ▲ and ▼ keys simultaneously, then press
Time ▼ to access the thermostat information.
M10229
5. Press the Increase ▲ again to display the model
identification number. (Example: 314 = Model ID 314)
M4934
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).
M4933A
6. Press Run Program to exit the self-test. The self-test
mode times out 5 minutes after the last key press.
CHECKOUT
M17112
3. Press Increase ▲ again to display the software
identification code.
Outdoor Temperature Sensor
(optional accessory)
(Example: 200 = software ID code 200)
Expose the outdoor temperature to outdoor air for a minimum
of five minutes before reading.
M17113
TROUBLESHOOTING GUIDE
Symptom
Possible Cause
Action
Display will not come Thermostat is not being Check for 24 Vac between R and W terminals.
on.
powered.
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 Room temperature
Enter Installer Setup number 37 and reconfigure the display.
incorrect.
display has been
reconfigured.
Thermostat is configured Enter Installer Setup number 14 and reconfigure the display.
for °F or °C display.
Bad thermostat location. Relocate the thermostat.
Temperature
displaying digits as
dashes (---).
Internal temperature
measurement failure.
Contact distributor or retailer.
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).
Temperature settings
will not change.
(Example:
Cannot set the
heating higher or the
cooling lower.)
The setpoint temperature Check Installer Setup numbers 34 and 35 and reconfigure the
range stops were
configured.
setpoint stops.
(continued)
Pub. No. 18-HD25D7-5
69-1213—1 (T8624)
10
Download from Www.Somanuals.com. All Manuals Search And Download.
XT302C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
TROUBLESHOOTING (Continued).
Symptom
Heating will not come No power to the
on. thermostat.
Possible Cause
Action
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 Thermostat minimum off Wait up to five minutes for the system to respond.
on.
time is activated.
System selection is not
set to Heat.
Set system selection to Heat.
Heating setpoint is below Check heating setpoint. Set heating setpoint to desired temperature.
room temperature.
Cooling will not come No power to the
Check for 24 Vac between R and W terminals.
If missing 24 Vac:
on.
thermostat.
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 Wait up to five minutes for the system to respond. Enter Installer Setup
time is activated.
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.
Add resistor in parallel with load or install interface relay.
Heating or cooling
Heat or cool circuit is
come on momentarily opening up or becoming
and shut off
high impedance.
Heating equipment turns Wait a minute after seeing the on indicator and then check the registers.
System on indicator
(flame=heat,
on the fan when the
furnace has warmed up
to a setpoint.
snowflake=cool)
displays, but no
warm or cool air is
coming from the
registers.
Heating or cooling
equipment is not
operating.
Verify operation of heating or cooling equipment in self-test.
Option not activated.
Enter Installer Setup number 24 and set to 1. Thermostat must have OT
terminals and a TAYSENS100A installed.
Outdoor temperature
not displayed
or is incorrect.
Outdoor sensor is
connected incorrectly.
Refer to TAYSENS100A installation instructions and check wiring
between the thermostat and sensor.
Wrong sensor.
Filter expired.
Replace sensor with TAYSENS100A sensor.
Refer to the Filter Indication section in the Owner’s Guide, Pub.
No. 22-5127-04
System on indicator
reads Filter and
Filter expired.
Refer to the Filter Indication section.
backlight is flashing.
Time displaying digits Internal memory failure.
as three E’s (EEE).
Contact distributor or retailer.
Pub. No. 18-HD25D7-5
69-1213—1 (T8624)
11
Download from Www.Somanuals.com. All Manuals Search And Download.
American Standard Inc.
Troup Highway
Tyler, TX 75711-9010
69-1213—1 T. C. Rev. 1-99
Printed in Taiwan R.O.C.
Download from Www.Somanuals.com. All Manuals Search And Download.
|