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 www.thermostat-recycle.org for information on disposing of products containing mercury.
Thermostat Applications | Maximum Stages Heat/Cool |
Conventional Gas, Oil, Electric (mV and 24V), Heat Only, Cool Only or Heat/ Cool Systems | 1/1 |
Heat Pump (air source or geothermal) with no Aux. Heat | 1/1 |
Electrical Rating:
Rated Differentials: Fast Med Slow
WIRING
Refer to equipment manufacturer’s instructions for specific system wiring information. After wiring, see INSTALLER MENU for proper thermostat configuration. Wiring table shown are for typical systems and describe the thermostat terminal functions.
Terminal Designations | Terminal Function |
RC* | Power for Cooling |
RH* | Power for Heating |
O/B | Changeover Terminal-Energized in Heat (B) or Cool (O) for Heat Pump or Damper Systems |
Y** | Cooling Relay |
G | Fan Relay |
W** | Heating Relay |
C | Common wire for 24V (optional with batteries) |
WARNING
CAUTION
To prevent electrical shock and/or equipment damage, disconnect electrical power to system, at main fuse or circuit breaker box,until installation is complete.
To access the INSTALLER’S MENU set the system switch to the OFF position and then press and hold the temperature
Installer’s Menu # (Hold Menu 3 Seconds) | Description | Default Setting (flashing icons) | Settings (Press |
30 | Heat Cycle Rate (how often the heat will turn on) | MEd | SLO – slow MEd – medium FAS – fast |
35 | Cool Cycle Rate (how often the cooling will turn on) | MEd | SLO – slow MEd – medium FAS – fast |
50 | Compressor Lockout (protects the compressor from short cycling) | OFF | On – 5 minute display OFF – no delay |
65 | Maximum Heat Limit (maximum set point for heat mode) | 99 | 47 to 99 |
66 | Minimum Cool Limit (minimum set point for cool mode) | 45 | 45 to 97 |
Installer’s Menu # (Hold Menu 8 Seconds) | Description | Default Setting (flashing icons) | Settings |
79 | Fahrenheit or Celsius | °F | °F – Fahrenheit °C – Celsius |
81 | Temperature Display Adjustment (adjust the displayed “Room Temperature”) | 0 | -5 to +5 |
83 | Continuous Display Light (keep the backlight always on – “C” wire required) | OFF | On – always on OFF – momentarily |
Turn on power to the system.
Fan Operation
If your system does not have a G terminal connection, skip to Heating System.
Heating System
Cooling System
CAUTION
THERMOSTAT OVERVIEW
Before you begin using your thermostat, you should be familiar with its features, display and the location/operation of the thermostat buttons and switches.
THERMOSTAT BUTTONS AND SWITCHES | THE DISPLAY |
1.) Fan Switch | 5.) Thermostat is protecting the equipment from short cycling (5-minute delay) |
2.) System Switch | 6.) Indicates that the system is running in cool or heat |
3.) Raises Temperature Setting | 7.) Battery status indicator |
4.) Lowers Temperature Setting | 8.) Low battery indicator |
9.) Temperature setpoint | |
10.) Press and hold temp up down to access Menu | |
11.) SEE TROUBLESHOOTING |
Whenever “
Symptom | Possible Cause | Corrective Action |
No Heat/ No Cool/ No Fan (common problem) | 1.) Blown fuse or tripped circuit breaker 2.) Furnace power switch to OFF 3.) Furnace blower compartment door panel loose or not properly installed 4.) Loose connection to thermostat or system | 1.) Replace fuse or reset breaker 2.) Turn switch to ON 3.) Replace door panel in proper position to engage safety interlock or door switch
4.) Tighten Connections |
No Heat | 1.) System Switch not set to Heat 2.) Loose connection to thermostat or system 3.) Heating System requires service or thermostat requires replacement | Verify thermostat and system wires are securely attached. Diagnostic: Set System Switch to Heat and raise the setpoint above room temperature. Within five minutes the thermostat should make a soft click sound and “Heat On” should appear on display. This sound indicates the thermostat is operating properly. If the thermostat does not click, try the reset operation listed below. 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 system is operating correctly. |
No Cool | 1.) System Switch not set to Cool 2.) Loose connection to thermostat or system 3.) Cooling System requires service or thermostat requires replacement | Verify thermostat and system wires are securely attached. Diagnostic: Set System Switch to Cool and lower setpoint below room temperature. Same procedures 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 if the compressor lock-out option is selected in the installer menu. (see INSTALLER MENU, item 50) |
Heat, Cool or Fan Runs Constantly | Possible short in wiring, thermostat, heat, cool or fan system | Check each wire connection to verify they are not shorted or touching other wires. Try resetting the thermostat. If the condition persists contact your HVAC service person. |
Thermostat Display & Thermometer Disagree |
Thermostat display requires adjustment | Display can be adjusted +/-5°. See User Menu item 04 |
Symptom | Possible Cause | Corrective Action |
Furnace (Air Conditioner) Cycles Too Fast or Slow (narrow or wide temperature swing) | The location of the thermostat and/or the size of the Heating System may be influencing the cycle rate | Digital thermostats provide precise control and cycle faster than older mechanical models. The system turns on and off more frequently but runs for a shorter time. If you would like to increase cycle time, choose SLO for slow cycle in the Installer menu. (Reference menu items 30 & 35) If an acceptable cycle rate is not achieved, contact your HVAC service person. |
“Call for Service” icon appears on displayed | 1.) Heating system is not able to heat the space to within 10 degrees of the setpoint within 2 hours 2.) Cooling system is not able to cool the space to within 10 degrees of the setpoint within 2 hours 3.) If “–” is displayed for the Room Temperature, a replacement thermostat is needed 4.) None of the buttons operate on the thermostat | 1.) See corrective action for “No Heat”
2.) See corrective action for “No Cool”
3.) Replace thermostat
4.) Make sure keypad lockout is not turned on (denoted by icon) |
Resetting the Thermostat or Thermostat Settings
If the thermostat has good batteries, but has a blank display or does not respond to key presses, the thermostat should be reset by removing the batteries for 2 minutes. This reset will not change the menu settings. If the condition persists after reinstalling the batteries, replace the thermostat.
To conveniently reset only the user settings back to factory defaults, press the temperature
WARNING: This product contains a chemical known to the state of California to cause cancer and birth defects and other reproductive harm.
HOMEOWNER HELP LINE: 1-800-284-2925
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