Model S1-THSU21P1 LX Series LX Series S1-THSU32P7 S1-THSU32HP7 RESIDENTIAL Digital Thermostat Digital Thermostat BACKLIT DISPLAY Owner’s Manual Owner’s Manual Installation Instructions Installation Instructions...
CAUTION Follow the Installation Instructions before proceeding. Set the thermostat mode to “OFF” prior to changing settings in setup or restoring Factory Defaults. NOTE: Due to variations in environmental conditions, it is not always possible to achieve the desired humidification or dehumidification setpoint.
Glossary of Terms Auto-Changeover: A mode in which the thermostat will turn on the heating or cooling based on room temperature demand. Cool Setpoint: The warmest temperature that the space should rise to before cooling is turned on (without regard to deadband). Deadband: The number of degrees the thermostat will wait, once a setpoint has been reached, before energizing heating or cooling.
Table of Contents Get to Know Your Thermostat Quick Start INSTALLATION INSTRUCTIONS Sample Wiring Diagrams Test Operation USER SETUP Backlight Operation Scrolling Display Options Thermostat Display Options Programming Vacation Mode Emergency Heat System Runtimes Time Period Programming INSTALLER SETUP Program Mode Operation Timers and Deadbands Programming Fan Operation Comfort Recovery Operation...
Get to Know Your Thermostat Backlit LCD Display Front Panel Scrolling Display Heat or Cool Demand Indicator Red = Heat, Green = Cool Cooler Mode Warmer Button Button Button Humidity* (This feature not available on all models) Outdoor Temp. PROGRAM Program OFF RUN Off | Run...
Get to Know Your Thermostat Display Features Program ONOFF 2nd3rd 18:88 Stage Setup Step Day Night Morning Evening Fan On Outdoor The scrolling display will be used to help you easily navigate the setup screens in the thermostat. Clock with Day of the Week Indicates the current time and day.
Get to Know Your Thermostat Display Features Program ONOFF 2nd3rd 18:88 Stage Setup Step Day Night Morning Evening Fan On Outdoor Desired Set Temperature Indicates desired room temperature(s). Also displays the highest and lowest temperatures for the day. Morning, Day, Evening & Night icons Indicates the day part of the time period program.
Get to Know Your Thermostat Display Features Program ONOFF 2nd3rd 18:88 Stage Setup Step Day Night Morning Evening Fan On Outdoor AuxHeat icon Indicates 2nd stage electric strip heat is being used when the thermostat is programmed for Heat Pump operation. Only the Aux icon will appear during Cool to Dehumidify to indicate Reheat operation.
Quick Start During Setup and Programming: Press the WARMER or COOLER buttons to modify the selection. Press the MODE button to advance and confirm through the setup steps. Setting the Clock MODE and Day Set Clock Press the SET CLOCK button. Adjust the clock using the WARMER or COOLER buttons.
Quick Start Selecting Your Desired Temperature AUTO-CHANGEOVER MODE - Pressing the WARMER or COOLER buttons in Auto or Program mode will adjust both the heat and cool setpoints simultaneously. To adjust heat and cool setpoints individually, choose HEAT mode to adjust the heat setpoint and COOL mode to adjust the cool setpoint, then return to AUTO mode.
Installation Instructions Remove & Replace the Old Thermostat To install the thermostat properly, please follow these step by step instructions. If you are unsure about any of these steps, call a qualified technician for assistance. Assemble tools: Flat blade screwdriver, wire cutters and wire YOUR NAME 2:00 strippers.
Installation Instructions Wire Connections Wire Connections If the terminal designations on your old thermostat YOUR NAME 2:00 Outdoor EAT ET do not match those on the new thermostat, refer to the chart below or the wiring diagrams that follow. Wire from the Install on the new thermostat old thermostat...
Installation Instructions The LX Thermostat Backplate To remove the thermostat backplate: Using the Finger Pull Areas, pull the front housing away from the OUTDOOR W1/O/B SENSOR backplate. REMOTE SENSOR CONTACT FAULT DEHUM Backplate Front Housing Finger Pull Areas 24 VAC return 24 VAC common Fan relay Aux output...
Installation Instructions Explanation of Thermostat Jumpers Jumpers are located on the back of the thermostat GAS/ELEC RV=O GAS/ELEC RV=O HEATPUMP RV=B ELEC OUTDOOR W1/O/B SENSOR REMOTE SENSOR HEATPUMP RV=B ELEC CONTACT FAULT DEHUM GAS/ELEC GAS/ELEC This jumper configures the thermostat to control a conventional gas/electric system or a heat pump.
Installation Instructions Sample Wiring Diagrams Conventional Heating and Cooling Systems 3 Wire, Heat Only 4 Wire, Cool Only Residential & Commercial 1 Stage Heating Residential & Commercial 1 Stage Cooling. with no Fan. 24VAC Power 24VAC Power 24VAC Common 24VAC Common 1st Stage Cool W1/O/B 1st Stage Heat...
Installation Instructions: Test Operation The LX thermostat has a diagnostic feature that enables testing of all outputs. This feature is contained in Technician Setup. To enter Technician Setup, press and hold the SETUP button for 5 seconds until all the icons appear. Follow the next steps to view settings and test equipment. Press MODE to view the version numbers of the thermostat.
User Setup: Backlight Operation How to Change Settings in the Setup Screens To enter Advanced Setup, press the SETUP button, then press MODE. Use the WARMER or COOLER buttons to adjust the value of your selection. Press MODE to advance to the next setup step. Press SETUP again to leave the setup screens.
User Setup: Scrolling Screen and Display Options Scrolling Display Method (Setup Step 17) This option allows the user to choose how the scrolling text is displayed. Options are: Scrolling Non-Scrolling Scroll Letters Slow Whole Words Slow Scroll Letters Fast Whole Words Fast Scroll Words Slow Words Centered Slow Scroll Words Fast...
User Setup (This feature not available on all models) Vacation The Vacation feature allows the thermostat to use temporary, energy saving setpoints without having to change regular programming. VACATION Press the VACATION button to enter Vacation programming. Use the WARMER and COOLER buttons to choose the number of days desired to run the Vacation feature.
User Setup: System Runtimes These setup steps allow the user to monitor equipment runtimes and program service alerts. Service alerts are displayed in the scrolling marquee. RUNTIME Runtime hours or days appear in the clock display. Setup Step Press and hold FAN to clear service alert messages from the scrolling marquee.
User Setup: System Runtimes To view, set, or reset System Runtimes, press the SETUP button, then press MODE. Press MODE to advance to the desired setup step. Use the WARMER or COOLER buttons to adjust the value of your selection. Press SETUP again to leave the setup screens.
User Setup: Time Period Programming To enter Time Period Programming PROGRAM SET PROGRA screens, Press and hold PROGRAM until the scrolling prompt appears. OFF RUN HOLD TO SET OFF - Time Period Program is off. RUN - Time Period Program is running. HOLD TO SET - Press and hold PROGRAM to make Time Period HOLD TO SET...
Installer Setup How to Change Settings in the Setup Screens To enter Advanced Setup, press the SETUP button, then press MODE. Use the WARMER or COOLER buttons to adjust the value of your selection. Press MODE to advance to the next setup step. Press SETUP again to leave the setup screens.
Installer Setup Setpoint Limits (Setup Step 18) (This feature not available on all models) When this feature is set to ON, the heat and cool setpoints can be restricted to preset levels, set in steps 19 and 20. Maximum Heat Setpoint (Setup Step 19) - (35 - 99 ). Minimum Cool Setpoint (Setup Step 20) - (35 - 99 ).
Installer Setup Deadband Settings (Setup Steps 25 - 34) The Deadband is the number of degrees or minutes that the thermostat waits before it initiates the stages of heating or cooling. 1st Stage Deadband (Setup Step 25) - Specifies the minimum temperature difference between the room temperature and the desired setpoint before the first stage of heating or cooling is allowed to turn on.
Installer Setup Programming the Fan (Setup Steps 35 - 38) (This feature not available on all models) Fan Program (Setup Step 35) - This feature allows the fan to be programmed to turn on automatically for a specified period during the day. If this feature is set to ON, the next three steps will appear.
Installer Setup Humidity and Dehumidity (Setup Steps 40 -45, 70-71) (This feature not available on all models) Humidity Only With Heat (Setup Step 40) - When this step is set to ON, Humidity will not run without a demand for Heat. Fan With Humidity Demand (Setup Step 41) - Specifies if the fan should be turned on with a demand for Humidity.
Installer Setup Lockout Heat Pump On Outdoor Temp (Setup Steps 46 -47) This feature stops the heat pump from running below a specified outdoor temperature, where the heat pump has become inefficient or could damage equipment. Lockout Heat Pump With Outdoor Temp (Setup Step 46) - When set to ON, the Heat Pump Lockout feature is enabled.
NONE - Scrolling display shows ‘FAULT’ when a fault signal is active. YORK - Fault alerts 2 or 3 are interpreted from a Yorkguard Heat Pump Control. COMFORT ALERT - Fault alerts are controlled by the Comfort Alert accessory.
Installer Setup Auxiliary Output (This feature not available on all models) The LX Thermostat is equipped with a programmable auxiliary output. This output can be configured to be controlled from a variety of sources. Aux Output Polarity (Setup Step 57) - Specifies if the Auxiliary output will be Open (Normally Open) or Closed (Normally Closed).
Installer Setup Auxiliary Output Programming By Temp If TEMP is selected for the Aux Output, the following setup steps will appear: Aux Output Temp Source (Setup Step 64) - Specifies what temperature source will be monitored for controlling the programmable output. The options are: Thermostat - Temperature is monitored from the thermostat sensor.
Installer Setup Free Cooling (Setup Steps 67 - 68) To use Free Cooling, Setup Step 58 must be set to ‘FREE COOLING’. Free Cooling is an energy saving way to boost the efficiency of your air conditioning system by bringing in fresh air from the outside. The installation of a Free Cooling damper and outdoor temperature sensor may also be required.
Installer Setup Resetting the Thermostat to the Factory Default Settings (for default values see page 34) If, for any reason, you desire to return all the stored settings back to the factory default settings, follow the instructions below. WARNING: This will reset all Time Period and Advanced Programming to the default settings.
Installer Setup Locking/Unlocking the Keypad To prevent unauthorized use of the thermostat, the front panel buttons may be disabled. To disable, or ‘lock’ the keypad, press and hold the MODE button. While holding the MODE button, press the WARMER and COOLER buttons together.
Technician Setup To enter Technician Setup, press and hold the SETUP button for 5 seconds. After all the icons appear, press MODE. The version number of the thermostat will appear in the scrolling text. Press MODE to advance to the next step. Use the WARMER or COOLER buttons to adjust the value of your selection.
Df = Factory Default Setting Advanced Setup Table *Not available on all models Step# Description Range Prog Mode Non,1,5/2*,7* Available Modes Heat/Cool/Auto/Off, Heat/Cool/ Heat/Cool/Off,Heat/Off, Auto/Off Cool/Off Backlight On,Off,6pm-6am 6pm-6am Backlight Level Off-7 levels of brightness Level 5 Current Service Filter Runtime Hours 0-1999 Current Service Filter Calendar Days 0-1999...
Df = Factory Default Setting Advanced Setup Table *Not available on all models Step# Description Range *Humidity Polarity Open,Closed Open *Dehumidify Polarity Open Open,Closed Press Fan To Clear All Messages Page 36...
TroubleShooting SYMPTOM: The air conditioning does not attempt to turn on. YOUR NAME 2:00 Outdoor EAT ET CAUSE: The compressor timer lockout may prevent the air COOLER MODE WARMER conditioner from turning on for a period of time. REMEDY: Consult the Owner's Manual in the Installer Setup section to defeat the Cycles Per Hour (page 22).
Index Remote Sensor averaging with Thermostat, 27 calibrate, 33,14 control to, 27 outdoor temperature, Schedule see Outdoor Technician Setup, 14, 33 Daily, see Program read to, 6 2nd stage turn off viewing, 6 Terminal, MISC, see temperature, MISC Reset Thermostat Sensor Sensor alert messages, 18 averaging, 27...
Warranty Five-Year Warranty - This Product is warranted to be free from defects in material and workmanship. If it appears within five years from the date of original installation, whether or not actual use begins on that date, that the product does not meet this warranty, a new or remanufactured part, at the manufacturer’s sole option to replace any defective part, will be provided without charge for the part itself provided the defective part is returned to the distributor through a qualified servicing dealer.
Programming Worksheet see Page 20 DAY PERIOD START TIME COOL HEAT Morning Evening Night Morning Copy Mon Evening Night Morning Copy Tue Evening Night Morning Copy Wed Evening Night Morning Copy Thu Evening Night Morning Copy Fri Evening Night Morning Copy Sat Evening Night...