Trane TAYSTAT 540 User Manual

Programmable Heat-Pump Thermostat

TAYSTAT 540

OWNER’S GUIDE

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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.

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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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