This package should contain the following items:
Required tools:
Optional tools:
Turn off power
To prevent electrical shock and/or equipment damage, disconnect electrical power to the system at the main fuse or circuit breaker box, or by flipping a switch at the air handler. Do not restore power until installation is complete.
To ensure the power to your heating and cooling system has been turned off, try to turn on heating or cooling by changing the temperature on your old thermostat.
Remove the old thermostat cover
Remove the old thermostat’s front cover from the wall base. Some covers pull of easily, while others may need to be released by using a screwdriver.
Your old thermostat may have a sealed glass tube containing mercury. Be careful not to damage the tube or dispose of the tube in your trash. For safe disposal information, please see Mercury Notice.
Tip: Taking a picture with a camera or smartphone can help you not only remember how wires are connected to the terminals, but can also ensure that you label your wires correctly. Mislabeling the wires may result in a high energy bill or damage to your heating and cooling system.
Using your screwdriver, carefully unscrew one wire at a time from the terminal block and attachthe corresponding wire label sticker.
Please note that not all terminals may be used, and that there’s no standard color code for thermostat wires, so your wire colors may vary. For your reference, we’ve included a terminal label reference chart below to help you connect the wires in your old thermostat to your new thermostat in case you get stuck.
Terminal labeling reference chart
If your current terminal has the following letter. Label the wires with the following letters: Terminal function
RH, R, R5, 5: RH: 24V Power (Heating)
RC: RC: 24V Power (Cooling)
W, W1, 4: W: Heating Relay
Y, Y1: Y: Cooling Relay
G: G: Fan Relay
O: O: Reversing Valve (for heat pump applications energized in Cool mode)
B: B: Reversing Valve (for heat pump applications energized in Heat mode)
For terminal RC and RH:
For terminal Y and W:
If you have a heat pump with reversing valve, connect Y and W with a jumper wire on your new thermostat.
If you need help with labeling and wiring, please contact Customer Support at 877.654.9394 or email wr.techsupport@emerson.com — we’re here to help!
Remove old thermostat base
With all of your wires disconnected and properly labeled, you may now safely remove the thermostat base from your wall.
Tip: Worried about having your wires falling into your wall? Keep the wires secure by wrapping the them around a pencil.
Mount your new thermostat base using the supplied screws. Drill holes and insert wall anchors to secure the thermostat base to the wall, if necessary.
Connect wires to corresponding terminal blocks
Match each labeled wire to it’s corresponding terminal on the mounted thermostat base. Insert each labeled wire into the hole of it’s matching terminal, and using the screwdriver, tighten the screw on the terminal block securely.
Take care when securing and routing wires so they do not short to adjacent terminals or rear of thermostat. Personal injury and/or property damage may occur.
If you have either a gas or oil furnace, set the switch to GAS.
If you have an electric furnace, set the switch to ELEC.
Install the batteries and attach front cover
Install the included AAA alkaline batteries and push the front cover on to the thermostat base until it’s secure.
Turn on power
Turn on your power at the source.
Congratulations! You’ve completed the thermostat installation process
Tip: If at any time during testing your system does not operate properly, please contact Customer Support at 877.654.9394 or email wr.techsupport@emerson.com
Note: To prevent static discharge problems, touch side of thermostat to release static build-up before touching any keys.
If at any time during testing your system does not operate properly, contact a qualified service person.
If your system does not have a G terminal connection, skip to Heating System.
To prevent compressor and/or property damage, if the outdoor temperature is below 50°, DO NOT operate the cooling system
This thermostat has a time delay between cooling cycles to allow the head pressure in the compressor to stabilize.
If the temperature is adjusted to call for cool within 5 minutes of the last cycle the snowflake icon will blink indicating the thermostat is locked out. After 3 to 5 minutes, the compressor will start and the snowflake icon will stop flashing.
This helps prevent the compressor from cycling too quickly and is normal operation for the thermostat.
Before you begin programming your thermostat, you should be familiar with its features and with the display and the location and operation of the thermostat buttons. Your thermostat consists of two parts: the thermostat cover and the base. To remove the cover, pull it straight out from the base. To replace the cover, line up the cover with the base and press until the cover snaps onto the base.
Now that you are familiar with the thermostat buttons and display, read the following information to learn about the many features of the thermostat.
This section will help you plan your thermostat’s program to meet your needs. For maximum comfort and efficiency, keep the following guidelines in mind when planning your program.
Look at the factory preprogrammed times and temperatures shown below. If this program will suit your needs, simply press the RUN button to begin running the factory preset program.
If you want to change the preprogrammed times and temperatures, follow these steps.
Determine the time periods and temperatures for your weekday and weekend programs. You must program four periods for both the weekday and weekend program. However, you may use the same heating and cooling temperatures for consecutive time periods. You can choose start times, heating temperatures, and cooling temperatures independently for both weekday and weekend programs (for example, you may select 5:00 AM and 70° as the weekday 1st period heating start time and temperature, and also choose 7:00 AM and 76° as the weekday
1st period cooling start time and temperature). Use the table at the bottom of the page to plan your program time periods and the temperatures you want during each period. You may also want to look at the sample program table to get an idea of how the thermostat can be programmed.
Heating/Cooling Schedule Plan (Factory Program)
Heating/Cooling Schedule Plan
Entering your program
Follow these steps to enter the heating and cooling programs you have selected.
Set current time and day
Enter heating program
Enter cooling program
If the outside temperature is below 50° F, disconnect power to the cooling system before programming. Energizing the air conditioner compressor during cold weather may cause personal injury or property damage.
Follow these steps to check your thermostat programming one final time before beginning thermostat operation.
YOUR THERMOSTAT IS NOW COMPLETELY PROGRAMMED AND READY TO AUTOMATICALLY PROVIDE MAXIMUM COMFORT AND EFFICIENCY!
Reset Operation
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the thermostat by pressing,
Batteries
For optimum performance, we recommend replacing batteries once a year with fresh “AAA” alkaline batteries.
Symptom:
Possible Cause:
Corrective Action.
Heat, Cool or Fan Runs Constantly.
Check each wire connection to verify they are not shorted or touching together. No bare wire should stick out from under terminal screws. Try resetting the thermostat. If the condition persists the manufacturer of your system or service person can instruct you on how to test the Heat/Cool system for correct operation. If the system operates correctly, replace the thermostat.
No Heat:
Re-light pilot.
Set SYSTEM Switch to HEAT and raise setpoint temperature above room temperature. Verify thermostat and system wires are securely attached.
Many furnaces have safety devices that shutdown when a lock-out condition occurs. If the heat works intermittently contact the furnace manufacturer or local service person for assistance.
Diagnostic: Set SYSTEM Switch to HEAT and the setpoint above room temperature. Within a few seconds the thermostat should make a soft click sound. This sound usually indicates thethermostat is operating properly. If the thermostat does not click, try the reset operation listed above. If the thermostat does not click after being reset contact your heating and cooling service person or place of purchase for a replacement.
If the thermostat clicks, contact the furnace manufacturer or a service person to verify the heating is operating correctly.
No Cool:
Set SYSTEM Switch to COOL and lower setpoint temperature below room temperature. Verify thermostat and system wires are securely attached.
Same procedure as diagnostic for No Heat condition except set the thermostat to COOL and lower the setpoint below the room temperature. There may be up to a five minute delay before the thermostat clicks in Cooling.
Heat, Cool or Fan Runs Constantly.
Check each wire connection to verify they are not shorted or touching together. No bare wire should stick out from under terminal screws. Try resetting the thermostat as described above. If the condition persists themanufacturer of your system or service person can instruct you on how to test the Heat/Cool system for correct operation. If the system operates correctly, replace the thermostat.
Furnace Cycles Too Fast or Too Slow (narrow or wide temperature swing):
Digital thermostats normally provide precise temperature control and may cycle faster than some older mechanical models. A faster cycle rate means the unit turns on and off more frequently but runs for a shorter time so there is no increase in energy use.
If you would like to increase the cycle time, clip Jumper W-905 as mentioned in the instructions for Hydronic Heating Systems. It is not possible to shorten the cycle time. If an acceptable cycle rate is not achieved as received or by clipping W-905 contact a local service person for additional suggestions.
Cooling cycles Too Fast or Too Slow (narrow or wide temperature swing):
The cycle rate for cooling is fixed and can not be adjusted. Contact a local service person for suggestions.
Thermostat Setting and Thermostat Thermometer Disagree:
The thermometer can be adjusted +/- 3 degrees. See Temperature Display Adjustment in the Operation section.
Thermostat Does Not Follow Program:
Check current clock and programsettings including the AM or PM designations for each time period. If a voltage spike or a static discharge occurs use the Reset Operation listed above.
Blank Display and/or Keypad Not Responding:
Replace batteries and check heat/cool system for proper operation. If a voltage spike occurs use the Reset Operation listed above.
Customer support: 877.654.9394 or wr.techsupport@emerson.com
This product does not contain mercury. However, this product may replace a product that contains mercury.
Mercury and products containing mercury must not be discarded in household trash.
Refer to thermostat-recycle.org for location to send product containing mercury.
FOR CALIFORNIA RESIDENTS
Warning: This product contains a chemical known to the state of California to cause cancer and birth defects and other reproductive harm.
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