LX Series Digital Thermostat Digital Thermostat Model S1-THSU21P1 S1-THSU32P7 S1-THSU32HP7 RESIDENTIAL BACKLIT DISPLAY Owner’s Manual and 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. This device complies with Part 15 of the FCC Rules.
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. Dehumidify: To reduce the amount of moisture in the air.
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 Humidification & Dehumidification Dual Fuel Operation Remote Sensor Operation Auxiliary Output Dry Contact
Get to Know Your Thermostat Backlit LCD Display Front Panel Scrolling Display Heat or Cool Demand Indicator Red = Heat, Green = Cool Cooler Button Mode Button Warmer Button Humidity* (This feature not available on all models) Fan Outdoor Temp.
Get to Know Your Thermostat Display Features Pm 18:88Am 2nd3rd Stage Program ONOFF 188 C LS H OO ET Setup Step 188 Day Night Morning Evening 6 Fan On Outdoor 188 AUXHEAT SET 88 Lo 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. This clock is also used to program the time period schedules. 6 Mode Indicators Selects the operational mode of the equipment.
Get to Know Your Thermostat Display Features 10 Pm 18:88Am 2nd3rd Stage Program ONOFF 188 C LS H OO ET Setup Step 188 Day Night Morning Evening Fan On Outdoor 11 AUXHEAT SET 188 88 Lo 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. Setup Step icon Indicates the step number when the thermostat is in the setup mode.
Get to Know Your Thermostat Display Features Pm 18:88Am 2nd3rd Stage Program ONOFF 188 C LS H OO ET Setup Step 15 188 Day Night Morning Evening Fan On Outdoor 188 AUXHEAT SET 88 Lo 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. Lo icon Indicates the lowest recorded outdoor temperature for the day.
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 and Day MODE Set Clock Press the SET CLOCK button. Adjust the clock using the WARMER or COOLER buttons. Press MODE to advance to the day setting. Adjust the day using the WARMER or COOLER buttons. Press the SET CLOCK button to confirm settings.
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. HEAT OR COOL MODE - Pressing the WARMER or COOLER buttons in Heat or Cool mode will adjust only the heat or cool setpoints individually displayed.
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.
Wire Connections Installation Instructions Wire Connections YOUR NAME I 2:00 Am 74 MO Outdoor 85 COOL SET 78 HEAT SET 68 If the terminal designations on your old thermostat do not match those on the new thermostat, refer to the chart below or the wiring diagrams that follow. Wire from the old thermostat terminal marked Function Install on the new thermostat connector marked G or F Fan G Y1, Y or C Cooling Y1 W1, W or H Heating W1/O/B Rh, R, M, Vr, A Power R C Common C O/B Rev.
Installation Instructions The LX Thermostat Backplate R G W1/O/B W2 Y1 Y2 W3 HUM DEHUM To remove the thermostat backplate: Using the Finger Pull Areas, pull the front housing away from the backplate.
Installation Instructions Explanation of Thermostat Jumpers Jumpers are located on the back of the thermostat GAS/ELEC J1 GAS/ELEC J2 HEATPUMP RV=B GAS HEATPUMP (FAN) J1 RV=O J3 ELEC J1 GAS/ELEC HEATPUMP HEATPUMP RV=O J2 RV=O ELEC G SENSOR DRY W1/O/B W2 Y1 Y2 W3 HUM DEHUM This jumper configures the thermostat to control a conventional gas/electric system or a heat pump. If your system is anything other than a heat pump, leave this jumper set for GAS/ELEC.
Installation Instructions Sample Wiring Diagrams Conventional Heating and Cooling Systems 3 Wire, Heat Only 4 Wire, Cool Only Residential & Commercial 1 Stage Heating with no Fan. R C W1/O/B 24VAC Power 24VAC Common 1st Stage Heat J1 J2 J3 Gas/Elec O (not used) Gas = = = Residential & Commercial 1 Stage Cooling.
Installation Instructions Sample Wiring Diagrams Heat Pump Systems 5 Wire, 1 Stage Cooling, 1 Stage Heat 6 Wire, 1 Stage Cooling, 2 Stage Heat Residential & Commercial Heat Pump with ‘O’ Reversing Valve Residential & Commercial Heat Pump with ‘O’ Reversing Valve R C W1/O/B Y1 G J1 J2 J3 = = = 24VAC Power 24VAC Common Reversing Valve 1st Stage Compressor (Cool or Heat) Fan R C W1/O/B Y1 W2 G Heat Pump O Gas J1 J2 J3 = = = 24VAC Power 24VAC Common Reversing Valve 1st Stage Compressor (Cool or Heat)
Installation Instructions Sample Wiring Diagrams Heat Pump Systems with Dual Fuel 7 Wire, 2 Stage Cooling, 3 Stage Heat Residential & Commercial Heat Pump with ‘O’ Reversing Valve and Fossil Fuel furnace. R C W1/O/B W2 Y1 Y2 G 24VAC Power 24VAC Common Reversing Valve 3rd Stage Heat (connected to furnace) 1st Stage Compressor (Cool or Heat) 2nd Stage Compressor (Cool or Heat) Fan J1 J2 J3 = = = Heat Pump O GAS Setup Step 24 is set to 2 (Number of Compressor Stages) Setup Step 46 is set to ON.
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. 1. Press MODE to view the version numbers of the thermostat. 2. Press MODE again to view the jumper settings and current state of the Dry Contact and Fault terminals. 3.
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. MODE SETUP Backlight (Setup Step 3) The thermostat backlight may be set to be always on, on temporarily with any button press, on throughout the evening, or always off.
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 Scroll Letters Slow Scroll Letters Fast Scroll Words Slow Scroll Words Fast Non-Scrolling Whole Words Slow Whole Words Fast Words Centered Slow Words Centered Fast 1 Press the SETUP button, then press MODE repeatedly until the Scrolling Method setup step appears. Use the WARMER or COOLER buttons to make selection.
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. To confirm your settings and advance to the next step, press the VACATION button again. Choose the desired Vacation Cool setpoint. Press VACATION.
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 hours or days appear in the clock display. RUNTIME 30 05 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. Heating and Cooling System Runtime - Energy Watch (Setup Steps 7 -9) (This feature not available on all models) Current Heat Runtime Hours (Setup Step 7) - This counter keeps track of the number of hours the system has run in Heating.
User Setup: Time Period Programming To enter Time Period Programming screens, Press and hold PROGRAM until the scrolling prompt appears. OFF - Time Period Program is off. RUN - Time Period Program is running. HOLD TO SET - Press and hold PROGRAM to make Time Period Programming changes. PROGRAM SET PROGRA M OFF RUN HOLD TO SET OFF RUN HOLD TO SET Programming a Daily Schedule Select Day of Week to program - Press the WARMER or COOLER buttons to choose the day of the week to be programmed.
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. MODE SETUP Selecting Your Program Mode (Setup Step 1) This thermostat may be configured to be programmable or non-programmable. 7 Day Program - Allows all seven days to be programmed independently.
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 ). Cycles Per Hour (Setup Step 21) The Cycles Per Hour setting may limit the number of times per hour your HVAC unit may energize.
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. Minutes Of Fan Runtime Per Hour (Setup Step 36) - This setting specifies the number of minutes (0 - 60, in increments of 5) that the fan will run at the top of each hour.
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. (This step will only appear if step 40 is set to OFF.
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. When set to OFF, the heat pump will stage normally.
Installer Setup Dual Fuel (Cont.) Setup steps 51-54 will only appear if step 50 is set to ON. Dual Fuel Safety Timer (Setup Step 51) - On/Off When this feature is set to ON, the room temperature must rise 1 degree within 60 minutes after a switch to fossil fuel has been made. If the room temperature does not rise, the fossil fuel system will cease operating and the heat pump will be restarted.
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). Aux Output (Setup Step 58) - Specifies which source will control the Aux output. Choices are: Time - Uses the internal clock of the thermostat.
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. Outdoor Sensor - Temperature is monitored from the Outdoor temperature sensor.
Installer Setup use Free Cooling, Setup Step 58 Free Cooling (Setup Steps 67 - 68) To 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. Free Cooling With A/C (Setup Step 67) - When the Aux Output is being used for Free Cooling and an air conditioning system is present, set this step to ON.
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. Any information entered prior to this reset may be permanently lost. Press and hold SETUP for 5 seconds. All icons will appear on the display.
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. The icon will appear on the display, then release the buttons.
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. To leave Technician Setup, press SETUP.
Advanced Setup Table Df Pg# Range 7 21 Non,1,5/2*,7* Heat/Cool/ 21 Heat/Cool/Auto/Off, Heat/Cool/Off,Heat/Off, Auto/Off Cool/Off 15 On,Off,6pm-6am 6pm-6am Backlight 15 Off-7 levels of brightness Level 5 Backlight Level 18 0-1999 0 Current Service Filter Runtime Hours 18 0-1999 0 Current Service Filter Calendar Days 19 0-1999 0 *Current Heat Runtime Hours 19 0-1999 0 *Current Strip Heat Runtime Hours 19 0-1999 0 *Current Cool Runtime Hours 19 0-1999 0 Current UV Lamp Calendar Days 19 0-1999 0 *Current Humid
Df = Factory Default Setting *Not available on all models Advanced Setup Table Pg# Range Step# Description 34 *4th Stage Turnoff Point 23 Deadband,Setpoint 35 *Fan Program 24 On,Off 36 *Minutes of Fan Runtime Per Hour 24 0-60 37 *Fan Program Start Time 24 12am-12am 38 *Fan Program Stop Time 24 12am-12am 39 *Control to Temp Source 27 Tstat,Remote,Average 40 *Humidity Only With Heat 25 On,Off *Fan With Humidity Demand 41 25 Fan on,Fan off 42 *Humidity Setpoints 25 Auto,Manual 43 *Cool To Dehumidify 25 Off,O
Df = Factory Default Setting *Not available on all models Advanced Setup Table Step# Description 73 *Humidity Polarity 74 *Dehumidify Polarity 75 Press Fan To Clear All Messages Pg# Range 25 Open,Closed 25 Open,Closed 29 N/A Page 36 Df Open Open N/A
TroubleShooting YOUR NAME I 2:00 Am 74 MO COOL SET Outdoor 85 COOLER 78 MODE HEAT SET 68 WARMER YOUR NAME I 2:00 Am 74 MO COOL SET Outdoor 85 COOLER 78 MODE HEAT SET 68 WARMER YOUR NAME I 2:00 Am 74 MO COOL SET Outdoor 85 COOLER 78 MODE HEAT SET 68 WARMER YOUR NAME I 2:00 Am 74 MO COOL SET Outdoor 85 COOLER 78 MODE HEAT SET 68 WARMER YOUR NAME I 2:00 Am 74 MO COOL SET Outdoor 85 COOLER 78 MODE HEAT SET 68 WARMER YOUR NAME I 2:00 Am 74 MO COOL SET
Index Alerts see Runtime Accessory, 17 Auto adjust temperature, 6 changeover, 21 fan, 6 mode, 5, 21 Aux icon, 4 AuxHeat icon, 3 Aux Heat Lockout, 26 Auxiliary Output, 28, 29 Average thermostat sensor, 27 b reversing valve, 33, 10 Backplate, 9 Balance Point, 27 Buttons accessory, 1, 17 cooler (down) 1, 5 display, 1, 16 emergency heat, 1, 17 fan, 1, 6, 16 front panel, 1 humidity, 1, 6 mode, 1, 5 outdoor, 1, 6 program, 1, 20 set clock, 1, 5 setup, 1, 15, 21 vacation, 1, 17 warmer (Up), 1, 5 C, 27 Calibrati
Index Day icon, 3 programming, 20 setting, 20 Deadband balance point, 23 1st stage, 23 2nd stage, 23 3rd stage, 23 Dry Contact operation, 30 polarity, 30 service pan, 30 vacation, 17, 30 Dual Fuel changeover balance point, 27 control two heat sources, 26 operation, 26 outdoor sensor, 6, 27 safety timer, 27 Dehumidify Aux icon, 2 cool to, 25 dehum settings, 25 setpoint, 25 Delay fan-off, see Fan time between stages, see Time Delay Differential heat and cool, 22 Disabled Keypad see Keypad Lockout Drain Pa
Index icon, 4 indicator, 1 mode, 2, 5 program, see Program runtime, see RunTime setpoint, 6, 20 Green Indicator, 1 Heat 1st stage deadband, see Deadband emergency heat, 17 minutes of runtime, 23 2nd stage deadband, see Deadband emergency heat, 17 electric strip heat, 17 minutes of runtime, 23 3rd stage deadband, see Deadband AuxHeat icon, 2 deadband, see Deadband droop, see Deadband electric/heat pump, 10 Heat Pump AuxHeat, 12, 13, 26 AUXHeat Lockout 27 emergency heat, 17 heat pump Lockout 26 jumper sett
Index Lo icon, 4 temperature, 6 programmable output, 28 dehum terminal, 25 daily schedule, 20 mode, 21 worksheet, back page Programmable Fan 24 Manual changeover, 21 cool, 21 heat, 21 Maximum Outdoor Temperature, see Hi Minimum Outdoor Temperature, see Lo MISC jumper, see Jumpers Mode, 2, 5, 21 O Reversing Valve see Reversing Valve Off Mode, 2, 5 Outdoor button, see Buttons icon, 1 sensor, 6 viewing temperature, 6 Auxiliary Output external control, 28 error, 28 temperature-based control, 28, 29 time-ba
Index Remote Sensor averaging with Thermostat, 27 calibrate, 33,14 control to, 27 outdoor temperature, see Outdoor read to, 6 viewing, 6 Reset alert messages, 18 thermostat settings, see Factory Defaults runtime fan/filter, 18 humidify, 19 UV light, 19 Reversing Valve, 10 Runtime resetting, see Reset setting, humidifier, 19 service filter, 18 UV light, 19 viewing, cool, 19 heat, 19 humidification, 19 UV lamp, 19 Schedule Daily, see Program 2nd stage turn off temperature, 23 Sensor outdoor, see Outdoor rem
Index UV Light resetting, 19 runtime, see Runtime setting, see Runtime Vacation, button, see Buttons mode, 17 programming, 17 setpoints,17 Venting, 30 W3, see Jumpers Warranty, 44 Y2, see Jumpers Page 43
Warranty Five-Year Warranty - This Product is warranted to be free from defects in material and workmanship.
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Programming Worksheet see Page 20 DAY PERIOD START TIME COOL HEAT Morning M O N D A Y T U E S D A Y W E D N E S D A Y T H U R S D A Y F R I D A Y S A T U R D A Y S U N D A Y Day Evening Night Morning Copy Mon Tue Day No Evening Yes Night Morning Copy Tue Wed Day No Evening Yes Night Morning Copy Wed Thu Day No Evening Yes Night Morning Copy Thu Fri Day No Evening Yes Night Morning Copy Fri Sat Day No Evening Yes Night Morning Copy Sat Sun Day No Evening Yes Nig
