Programmable Heat-Pump Thermostat
TAYSTAT 540
OWNER’S GUIDE
Pub. No. 22-5185-01
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FEATURES
The Trane Co. sells comfort systems.
Comfort is achieved through matching the
correct equipment and controls. This
thermostat is designed to provide the
maximum comfort for your needs.
Some of the basic offerings are:
• Program up to four time periods and
temperature settings to complement
your lifestyle.
• Set different schedules for weekdays
and weekends.
• Programs are permanently held in
memory in the event of a power failure.
• Indefinite temperature hold.
• Preprogrammed for your convenience.
HOLD KEY OVERRIDES PROGRAM
OR HOLDS TEMPERATURE INDEFINITELY.
LCD DISPLAY
PM
FAN SYSTEM
Auto On
FAN SWITCH
AUTO: FAN RUNS ONLY
WHEN SYSTEM OPERATES.
ON: FAN RUNS
CONTINUOUSLY.
Hold Select
Cool Off Heat Em. Ht.
2
INCREASE KEY:
INCREASE
TEMPERATURE,
SET TIME, OR SCROLL
THROUGH DAYS OF WEEK.
SELECT KEY: SET
CURRENT DAY AND
TIME, OR SET
PROGRAM DAY
AND TIME.
DECREASE KEY:
DECREASE
TEMPERATURE,
SET TIME, OR SCROLL
BACKWARD THROUGH
DAYS OF WEEK.
SYSTEM SWITCH. SLIDE TO
COOL, OFF, OR HEAT FOR
PROGRAMMING. SLIDE TO
COOL, OFF, HEAT, OR EM. HT.
FOR CURRENT SETTING.
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Your thermostat displays the current day, time, period, temperature and system ( for heating
or for cooling) in normal mode. In programming mode, only the setting or settings being
programmed display. For example “Sa Su” (Saturday Sunday) displays while programming the
weekend schedule. All settings are explained below:
SET DISPLAYS
WHILE SETTING
THE CLOCK.
CURRENT TIME DISPLAYS
IN NORMAL MODE. PERIOD
START TIME DISPLAYS IN
PROGRAMMING MODE.
CURRENT DAY DISPLAYS
IN NORMAL MODE.
MONDA Y THROUGH FRIDAY
DISPLAY DURING WEEKDAY
PROGRAMMING MODE.
SATURDAY AND SUNDAY
DISPLAY DURING WEEKEND
PROGRAMMING MODE.
TEMPORARY DISPLAYS
DURING TEMPORARY
TEMPERATURE HOLD.
SET
TEMPORARY
PM
Mo Tu We Th Fr Sa Su
WAKE LEAVE RETURN SLEEP
DURING NORMAL MODE, THE
CURRENT PERIOD DISPLAYS.
DURING PROGRAMMING, THE
PERIOD BEING PROGRAMMED
DISPLAYS (WAKE, LEAVE,
RETURN OR SLEEP).
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CURRENT TEMPERATURE
DISPLAYS. HEATING AND
COOLING SETPOINT DISPLAYS
DURING PROGRAMMING.
FLAME DISPLAYS DURING
HEATING OR WHILE
PROGRAMMING HEATING
SETPOINT. SNOWFLAKE
DISPLAYS DURING COOLING
OR WHILE PROGRAMMING
COOLING SETPOINT.
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PROGRAMMING YOUR
SET
PM
M12591
M12593
SET
THERMOSTAT
CLOCK
Setting the Current Day and Time
To set or reset the current day and time,
follow these instructions.
IMPORTANT
Note: To exit the programming mode at
Always press the keys with your
fingertip or similar blunt tool. Sharp
objects like pen and pencil points will
damage the keyboard.
any time, press Hold.
1. To set Current Time, press Select twice.
Press ▲ or ▼ to set current time.
Note: While setting the current time, SET
displays.
2. To set Day of Week, press Select
again. Press ▲ or ▼ to set current day.
3. Press Hold to exit programming mode.
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Organizing Your Schedule
Your thermostat can be set for four time periods (Wake, Leave, Return, and Sleep) for the
weekday schedule (Monday through Friday), and four time periods for the weekend schedule
(Saturday and Sunday). Without additional programming, your thermostat follows the same
preprogrammed schedule for both weekdays and weekends (see Table 1).
WAKE Choose the time you want your heating or cooling system to start to
LEAVE Choose the time you want your heating or cooling system to start an
reach your comfort temperature after the SLEEP period.
How? Consider the time required to reach your comfort level. Adjust the
Wake time to earlier when you know it will take the system longer to
reach your comfort temperature.
energy-saving mode while you are away at work or school.
How? Set the Leave temperature lower during heating season, and
higher during cooling season.
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RETURN Choose the time you want your heating or cooling system to start to
reach your comfort temperature after the energy-savings LEAVE
period.
How? Consider the time required to reach your comfort level. Adjust the
Return time to earlier when you know it will take the system longer to
reach your comfort temperature.
SLEEP Set the time you want your heating or cooling system to start to reach
your sleep temperature.
To use this period as an energy-savings mode, set the temperature
lower during heating season, and higher during cooling season.
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The preprogrammed schedule is shown in Table 1. You may keep this schedule or organize your
own. Schedules are adjustable as often as you wish. If you decide to keep this schedule, no
further programming is necessary.
Table 1. Preprogrammed Weekday and Weekend Schedule.
Period Time Heat Setpoint Cool Setpoint
Wake 6:00 AM 70°F (21°C) 78°F (26°C)
Leave 8:00 AM 62°F (17°C) 85°F (29°C)
Return 5:00 PM 70°F (21°C) 78°F (26°C)
Sleep 10:00 PM 62°F (17°C) 75°F (24°C)
To begin programming your weekday and weekend schedules, fill in Tables 2 and 3.
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Customizing Your Weekday Schedule
Use Table 2 to organize your weekday schedule. Fill in the times and temperatures you want to
program. The names of the four periods are filled in for you.
Table 2. Your Weekday Schedule.
Wake
Leave
Return
Sleep
Period
Start Time
Temperature
8
Heating
Cooling
Temperature
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Customizing Your Weekend Schedule
Use Table 3 to organize your weekend schedule. Fill in the times and temperatures you want to
program. The names of the four periods are filled in for you.
Table 3. Your Weekend Schedule.
Period
Wake
Leave
Return
Sleep
Start Time
Heating
Temperature
Cooling
Temperature
Note: Start Time is the time your thermostat begins to reach the desired temperature.
Note: The thermostat cannot be set higher than 99°F (37°C) or lower than 50°F (10°C).
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Setting the Weekday Program
IMPORTANT
Always press the keys with your
fingertip or similar blunt tool. Sharp
objects like pen and pencil points will
damage the keyboard.
1. Slide the SYSTEM switch to the setting
you want to program (Heat or Cool).
Throughout programming, the thermostat displays a flame (heating) or
snowflake (cooling) to help you
identify which mode you are programming. At the end of Setting the Weekend Program, you are prompted to
return to this step to program the
opposite mode. Example shows Cool
setting.
Hold Select
SYSTEM
Cool Off Heat Em. Ht.
FAN
Auto On
PM
SYSTEM SWITCH
NOTE: To exit the programming mode at
any time, press Hold (the thermostat
saves your changes).
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2. Set weekday Wake time and tempera-
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SET
AM
M17333
SET
ture.
a. Press Select four times. Press ▲
or ▼ to set Wake time.
SET
AM
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Note: Schedule times are programmable in
increments of 15 minutes. For each
press, the time increases or decreases
by 15 minutes.
b. Press Select. Press ▲ or ▼ to
set Wake temperature.
Note: When setting the Weekday Program,
the days Mo Tu We Th Fr display.
3. Set weekday Leave time and temperature.
a. Press Select. Press ▲ or ▼ to
set Leave time.
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b. Press Select. Press ▲ or ▼ to
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SET
PM
M17315
SET
set Leave temperature.
SET
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4. Set weekday Return time and temperature.
a. Press Select. Press ▲ or ▼ to
set Return time.
SET
PM
b. Press Select. Press ▲ or ▼ to
set Return temperature.
5. Set weekday Sleep time and temperature.
a. Press Select. Press ▲ or ▼ to
set Sleep time.
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b. Press Select. Press ▲ or ▼ to
AM
M17317
SET
IMPORTANT:
set Sleep temperature.
SET
M17316
Before pressing another key,
continue with Setting the Weekend
Program.
Setting the Weekend Program
Note: For initial programming, you must set
the weekday schedule as shown in
Setting the Weekday Program before
you can access weekend programming. If your weekday is already
programmed, you can access weekend
programming by pressing Select 12
times.
1. Set weekend Wake time and temperature.
a. Press Select. Press ▲ or ▼ to
set Wake time.
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b. Press Select. Press ▲ or ▼ to
AM
M17319
SET
M17320
SET
set Wake temperature. Example
shows Cool setting.
SET
2. Set weekend Leave time and temperature.
a. Press Select. Press ▲ or ▼ to set
Leave time.
Note: When setting the Weekend Program,
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the days Sa Su display.
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b. Press Select. Press ▲ or ▼ to
set Leave temperature.
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3. Set weekend Return time and tempera-
PM
M17323
SET
M17324
SET
ture.
a. Press Select. Press ▲ or ▼ to
set Return time.
SET
PM
M17321
b. Press Select. Press ▲ or ▼ to
set Return temperature.
SET
M17322
4. Set weekend Sleep time and temperature.
a. Press Select. Press ▲ or ▼ to
set Sleep time.
b. Press Select. Press ▲ or ▼ to
set Sleep temperature.
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5. Press Select. End displays.
TEMPORARY
PM
M17326
SET
Temporary Temperature Hold
1. Press ▲ or ▼ key twice to set a
temporary temperature.
M17325
PM
M17300
6. Return to Step 1., Setting the Week-
day Program to program the opposite
mode, (heating) or (cooling).
Your weekday and weekend schedules are
now programmed.
Note: The temporary temperature setting
remains in effect until the next
program period. To cancel, press
Hold twice and wait five seconds.
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Indefinite Temperature Hold
The Hold key allows you to hold a temperature indefinitely. When Hold is active, Hld
displays continuously.
1. Press Hold.
2. Press ▲ or ▼ key to set indefinite
temperature setting.
System and Fan
Use the SYSTEM and FAN switches to
change the settings.
System Setting
To select the desired system setting, slide the
SYSTEM switch in the lower right corner of
the thermostat.
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3. To cancel, press Hold and wait five
seconds.
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FAN
Auto On
PM
SYSTEM SWITCH
Hold Select
SYSTEM
Cool Off Heat Em. Ht.
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SYSTEM settings control the thermostat
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operation as follows:
Cool: Normal setting for months when your
home needs cooling (air conditioning). Digital display shows a
snowflake when cooling is on.
Off: Both heating and cooling are off.
Heat: Normal setting for months when your
home needs heating. Digital display
shows a flame when heating is
on.
Em. Ht.: Switch to this setting when your
home needs heat, but your equipment needs servicing or is not
working properly. In this mode, the
thermostat controls only the backup
heat. The heat pump is off.
NOTE: In the programming mode, the
and indicate the system setting.
Fan Setting
To select the desired fan setting, slide the
FAN switch in the lower left corner of the
thermostat.
FAN
Auto On
SYSTEM
Cool Off Heat Em. Ht.
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FAN SWITCH
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Auto: Normal setting for most homes.
Some systems may delay the fan
turning on and off with the equipment.
On: The fan runs continuously. Use for
improved air circulation and air
quality.
FAN
Auto On
FAN
SWITCH
M10273
Emergency Heat
The Emergency Heat feature allows you to
“turn on” the electric heat section of the
system by moving the system switch to the
Em. Ht. position. The indicator flashes and
▲
points to Em Ht when the system is in
emergency heat mode. The
indicator may
▲
also point to Aux Ht if the system calls for
additional back-up heating.
INDICATOR
Em Ht
Aux Ht
Set
Room
M10287
Auxiliary Heat
The auxiliary heaters assist the heat pump
under normal conditions when low outdoor
temperature occurs. The
Aux Ht when the auxiliary heating equipment
operates.
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▲
indicator points to
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Minimum Off-Timing
Your thermostat comes equipped with a
minimum off-timer. At certain times during
heating or cooling, the system will not start up
again for at least five minutes after it turns off
(compressor is off and can’t be heard). This
occurs when you change the SYSTEM switch
position while the compressor is off or when
you change the temperature setting, causing
the compressor to turn off. The minimum offtimer is also triggered during power interruption and power restoration. You will know the
minimum off time is in effect by a flashing
or on the display.
CAUTION
Equipment Damage Hazard.
Can cause permanent damage to
the compressor or other equipment.
To avoid possible equipment damage,
do not operate cooling when outside
temperature is below 50°F (10°C).
See equipment manufacturer instructions. To avoid possible compressor
damage, allow the compressor to
remain off for five minutes before
restarting.
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TROUBLESHOOTING GUIDE
Symptom Possible Cause Action
Display will not
come on.
Temperature
settings will not
change (Example:
cannot set the
heating higher or the
cooling lower).
Thermostat is not
being powered.
The upper or lower
temperature limits
were reached.
Check if the thermostat is mounted and
latched on the wallplate–mount and latch the
thermostat on the wallplate.
Check if the circuit breaker is tripped–reset
the circuit breaker.
Check if the fuse is blown–replace the fuse.
Check if the system switch is in the Off
position–set to Heat or Cool.
Check that the temperature setpoints are
within range:
Heating: 50° to 99° F (10° to 37° C)
Cooling: 50° to 99° F (10° to 37° C).
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(Contiuned)
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Troubleshooting (Contiuned)
Symptom Possible Cause Action
Heating will not
come on.
No power to the
thermostat.
System selection is
not set to Heat.
Heating setpoint is
below room
temperature.
Check that the setpoint is above room
temperature–reset temperature or wait for
room temperature to fall.
Check if the circuit breaker is tripped–reset
the circuit breaker.
Check if the fuse is blown–replace the fuse.
Check if the system switch at the equipment
is in the Off position–set to Heat position.
Wait five minutes for the system to respond.
Cooling will not
come on.
No power to the
thermostat.
System selection is
not set to Cool.
Cooling setpoint is
above room
temperature.
Check that the setpoint is below room
temperature–reset temperature or wait for
room temperature to rise.
Check if the circuit breaker is tripped–reset
the circuit breaker.
Check if the fuse is blown–replace the fuse.
Check if the system switch at the equipment
is in the Off position–set to Cool position.
Wait five minutes for the system to respond.
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Troubleshooting (Contiuned)
Symptom Possible Cause Action
System on indicator
and is lit,
but no warm or cool
air is coming from
the registers.
Heating/cooling
equipment turns on
the fan when the
equipment has
reached the
Wait a minute after seeing the flame or
snowflake and then check the registers.
setpoint.
System on indicator
or is
Minimum off timer is
in effect.
Wait five minutes until the minimum off timer
is complete.
flashing.
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LIMITED WARRANTY
Low Voltage Room Thermostats
This warranty is extended by American Standard Inc., to the original purchaser and to any succeeding
owner of the real property to which the Thermostat is originally affixed, and applies to products
purchased and retained for use within the U.S.A. and Canada.
If any part of your Thermostat fails because of a manufacturing defect within one year from the date of
the original purchase, Warrantor will furnish without charge a new thermostat. Any local transporta-
tion, related service labor and diagnosis calls are not included.
This warranty does not cover failure of your Thermostat if it is damaged while in your possession or if
the failure is caused by unreasonable use. In no event shall Warrantor be liable for incidental or
consequential damages. In no event shall any implied warranty of merchandise or fitness for use
exceed the term of the limited warranty stated above.
Some states do not allow limitations on how long an implied warranty lasts or do not allow the
exclusion or limitation of incidental or consequential damages, so the above limitation may not apply to
you. This warranty gives you specific legal rights, and you may also have other rights which vary from
state to state.
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Parts will be provided by our factory organization or an authorized service organization in your area. All you
need to do is look us up in the Yellow Pages or write to the address given below. If you wish further help or
information concerning this warranty, contact:
American Standard Inc.
Troup Highway
Tyler, TX 75711-9010
Attention: Manager, After Sales Support
CUSTOMER ASSISTANCE
If, after reading this guide, you have any questions concerning the operation of your thermostat, please call
the Thermostat Customer Assistance Helpline at 1-877-880-3381, Monday-Friday, 7:00 am-5:30 pm, Central
time.
For service, contact your local heating and cooling contractor.
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Pub. No. 22-5185-01
® U.S. Registered Trademark
69-1229 6-99 G.H. Printed in Mexico
American Standard Inc.
Troup Highway
T yler , TX 75711-9010
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