Programmable Heat-Pump Thermostat TAYSTAT 540 OWNER’S GUIDE Pub. No.
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: HOLD KEY OVERRIDES PROGRAM OR HOLDS TEMPERATURE INDEFINITELY. INCREASE KEY: INCREASE TEMPERATURE, SET TIME, OR SCROLL THROUGH DAYS OF WEEK. LCD DISPLAY Hold SELECT KEY: SET CURRENT DAY AND TIME, OR SET PROGRAM DAY AND TIME.
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: TEMPORARY DISPLAYS DURING TEMPORARY TEMPERATURE HOLD. SET DISPLAYS WHILE SETTING THE CLOCK. CURRENT TIME DISPLAYS IN NORMAL MODE. PERIOD START TIME DISPLAYS IN PROGRAMMING MODE.
PROGRAMMING YOUR THERMOSTAT SET PM CLOCK M12591 Note: Setting the Current Day and Time To set or reset the current day and time, follow these instructions. While setting the current time, SET displays. 2. To set Day of Week, press Select again. Press ▲ or ▼ to set current day. IMPORTANT Always press the keys with your fingertip or similar blunt tool. Sharp objects like pen and pencil points will damage the keyboard. SET M12593 Note: To exit the programming mode at any time, press Hold. 3.
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 reach your comfort temperature after the SLEEP period.
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.
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.
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. Period Heating Temperature Start Time Cooling Temperature Wake Leave Return Sleep 8 Pub. No.
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 Heating Temperature Start Time Cooling Temperature Wake Leave Return Sleep 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). 9 Pub. No.
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. Hold Select PM 1. Slide the SYSTEM switch to the setting you want to program (Heat or Cool). SYSTEM Cool Off Heat Em. Ht. FAN Auto On Throughout programming, the thermostat displays a flame (heating) or snowflake (cooling) to help you identify which mode you are programming.
2. Set weekday Wake time and temperature. a. Press Select four times. Press ▲ or ▼ to set Wake time. SET M17332 SET Note: When setting the Weekday Program, the days Mo Tu We Th Fr display. AM 3. Set weekday Leave time and temperature. a. Press Select. Press ▲ or ▼ to set Leave time. M17331 Note: Schedule times are programmable in increments of 15 minutes. For each press, the time increases or decreases by 15 minutes. SET AM b. Press Select. Press ▲ or ▼ to set Wake temperature. M17333 11 Pub.
b. Press Select. Press ▲ or ▼ to set Leave temperature. b. Press Select. Press ▲ or ▼ to set Return temperature. SET SET M17314 M17312 5. Set weekday Sleep time and temperature. a. Press Select. Press ▲ or ▼ to set Sleep time. 4. Set weekday Return time and temperature. a. Press Select. Press ▲ or ▼ to set Return time. SET SET PM PM M17315 M12628 12 Pub. No.
b. Press Select. Press ▲ or ▼ to set Sleep temperature. 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. SET M17316 IMPORTANT: Before pressing another key, continue with Setting the Weekend Program. 1. Set weekend Wake time and temperature. a. Press Select.
b. Press Select. Press ▲ or ▼ to set Wake temperature. Example shows Cool setting. 2. Set weekend Leave time and temperature. a. Press Select. Press ▲ or ▼ to set Leave time. SET SET AM M17318 Note: When setting the Weekend Program, the days Sa Su display. M17319 b. Press Select. Press ▲ or ▼ to set Leave temperature. SET M17320 14 Pub. No.
4. Set weekend Sleep time and temperature. a. Press Select. Press ▲ or ▼ to set Sleep time. 3. Set weekend Return time and temperature. a. Press Select. Press ▲ or ▼ to set Return time. SET SET PM PM M17321 b. M17323 Press Select. Press ▲ or ▼ to set Return temperature. b. SET Press Select. Press ▲ or ▼ to set Sleep temperature. SET M17322 M17324 15 Pub. No.
Temporary Temperature Hold 5. Press Select. End displays. 1. Press ▲ or ▼ key twice to set a temporary temperature. SET TEMPORARY M17325 PM M17326 PM Note: M17300 The temporary temperature setting remains in effect until the next program period. To cancel, press Hold twice and wait five seconds. 6. Return to Step 1., Setting the Weekday Program to program the opposite mode, (heating) or (cooling). Your weekday and weekend schedules are now programmed. 16 Pub. No.
Indefinite Temperature Hold System and Fan The Hold key allows you to hold a temperature indefinitely. When Hold is active, Hld displays continuously. Use the SYSTEM and FAN switches to change the settings. System Setting 1. Press Hold. To select the desired system setting, slide the SYSTEM switch in the lower right corner of the thermostat. 2. Press ▲ or ▼ key to set indefinite temperature setting. Hold Select PM M17327 3. To cancel, press Hold and wait five seconds. SYSTEM Cool Off Heat Em.
SYSTEM settings control the thermostat operation as follows: 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.
On: Normal setting for most homes. Some systems may delay the fan turning on and off with the equipment. The fan runs continuously. Use for improved air circulation and air quality. 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.
Minimum Off-Timing CAUTION 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.
TROUBLESHOOTING GUIDE Symptom Possible Cause Action Display will not come on. Thermostat is not being powered. 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. The upper or lower Temperature temperature limits settings will not were reached.
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.
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 setpoint. Wait a minute after seeing the flame or snowflake and then check the registers. System on indicator or is flashing. Minimum off timer is Wait five minutes until the minimum off timer in effect. is complete. 23 Pub. No.
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.
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.
Pub. No.
Pub. No.
Pub. No. 22-5185-01 ® U.S. Registered Trademark 69-1229 6-99 G.H. Printed in Mexico American Standard Inc.
