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The manual explains initialization and home-screen behavior, default Fahrenheit settings, and how to confirm and adjust day/time within time limits. It details button functions and backlight operation, including flashing input fields, setpoint display timing, and screen return logic. Heating modes cover normal heat with auxiliary backup activation and emergency heat that disables the heat pump until a heat demand occurs.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/51m37-merit-series-thermostat-operation-manual-52-day-programmable-thermostat/646943/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/51m37-merit-series-thermostat-operation-manual-52-day-programmable-thermostat/646943.png","ImageObject",300,407,{"name":92,"@type":93},"Jiven","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-04","2026-10-23",true,{"@type":102,"interactionType":103,"userInteractionCount":52},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What happens when power is first applied to the Lennox 51M37 thermostat?","Question",{"text":112,"@type":113},"The display segments activate as part of initialization. After a short time, the home screen appears with default settings, and about 1 minute later the actual room temperature is shown.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How do I set the day and time on the thermostat?",{"text":117,"@type":113},"Press the DAY/TIME button and adjust hour, minutes, and day of week using the Up/Down arrows. Confirm by pressing DAY/TIME at each step; daylight savings adjustments can be stored by pressing ENTER.",{"name":119,"@type":110,"acceptedAnswer":120},"What is the difference between normal heat mode and emergency heat mode?",{"text":121,"@type":113},"In normal heat mode, both the heat pump and backup heat source can provide heat, with the backup activated when the heat pump cannot meet demand. In emergency heat mode, only the backup heat source provides heat and the heat pump is disabled, activating only upon a heat demand.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},646943,1792900893,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":52,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145,"preview_page_count":4},1099513958607,"https://ap-avatar.wpscdn.com/avatar/100002390cf8733938c?x-image-process=image/resize,m_fixed,w_180,h_180&k=1778829742770036399","􀀁2005 Lennox Industries Inc.  \nDallas, Texas, USA  \nRETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE  \n51M37 Merit® Series Thermostat  \nThe Lennox Merit® Series 5/2 day programmable electronic thermostat 51M37 provides excellent temperature control and a large, easy-to-read display. It includes a programmable filter change reminder, an equipment maintenance reminder, and a system check indicator to notify the user when the equipment requires service.  \nThe 51M37 is suitable for heat pump, 3-stage heat/2-stage cool applications using a gas or electric auxiliary heat source. An optional outdoor temperature sensor provides auxiliary heat lockout, balance point operation, and dual−fuel compatibility.  \nGeneral  \nThese instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation.  \nCheck equipment for shipping damage. If you find any damage, immediately contact the last carrier.  \nIntroduction  \nThis document describes the operation of Lennox thermostat 51M37 . Refer to the installation manual for instructions regarding installation and wiring of the thermostat.  \nInitial Thermostat Power-up  \nWhen power is initially applied to the thermostat, the display will appear as shown in figure 1.  \nOPERATION MANUAL  \n51M37 Merit® Series  \n5/2 Day Programmable Thermostat  \nCONTROLS 505,050M  \n05/05 Supersedes 03/05  \nTable of Contents  \n51M37 Series Thermostat ...................... 1  \nGeneral ...................................... 1  \nIntroduction ................................... 1  \nInitial Thermostat Power-up ..................... 1  \nButtons, Backlight, Timers & Settings ............ 2  \nDAY/TIME − Set Day and Time .................. 2  \nHEAT − Heat Mode ............................ 3  \nCOOL − Cool Mode ............................ 4  \nHOLD − Temperature Hold Mode ................ 5  \nPROG − Thermostat Programming ............... 5  \nFAN − Controlling Fan Operation ................. 6  \nSETTINGS − Filter and Maintenance Reminders ... 6  \nSETTINGS − Balance Point ..................... 7  \nService Indicator .............................. 7  \nThermostat RESET ............................ 7  \nRemoving/Installing Thermostat ................. 7  \nDefault Thermostat Settings .................... 7  \nTechnical Specifications ........................ 8  \nThermostat Output Table ....................... 10  \n\n| Initial Power−Up Display |  |  |\n| --- | --- | --- |\n| MO TU WE TH FR SA SU\u003Cbr>AMPM I8:88\u003Cbr>PROG A | B | C | D  HOLD |  | \u003Cbr>|\n| ROOM\u003Cbr>88° | SETPOINT\u003Cbr>88 ° |  |\n\nFigure 1  \nAll display segments are momentarily activated. This occurs as a normal part of thermostat initialization.  \n05/05 􀀁􀀂􀀃􀀄􀀅􀀄􀀅􀀁  \nPage 1  \n505,050M 􀀁􀀃􀀅􀀄􀀅􀀄􀀅􀀄􀀆􀀁  \nWithin a few seconds, the Home Screen appears (see figure 2) with default settings as shown. After about 1 minute of initialization time, the actual room temperature will be displayed.  \nNOTE − Tables 2 and 3 on page 8 show all system and programming defaults.  \nHome Screen  \n\n| MO\u003Cbr>AM\u003Cbr>I2:00\u003Cbr>HOLD |  |  |\n| --- | --- | --- |\n|  |  | FAN\u003Cbr>AUTO |\n| ROOM\u003Cbr>70 ° | SYSTEM\u003Cbr>HEAT   |  |\n\nFigure 2  \nAt this point, the thermostat will be fully functional; its default temperature setpoint (not shown) is 70°F. At this point, if the equipment has been fully powered and if a heat demand were present, the system would begin operating.  \nNOTE − Temperature scale default is Fahrenheit units but may be reset to show Celsius, if desired. See page 8.  \nButtons, Backlight, Timers & Settings  \nButtons are located behind the small door on the right− hand side of the thermostat (see figure 3) .  \n\n|  IMPORTANT |\n| --- |\n| Do NOT begin pressing buttons until after you read the following section describing each button. |\n\nA pale blue display backlight illuminates for 30 seconds each time any button is pressed.  \nWhen PROG or DAY/TIME is pressed, a field begins flashing, expecting another input. Start making changes within 15 seconds o","cbCaibMEEkhmcbIb","https://ap.wps.com/l/cbCaibMEEkhmcbIb","pdf",866783,54,"English","# 51M37 Series Thermostat\n## General\n## Introduction\n## Initial Thermostat Power-up\n## Buttons, Backlight, Timers & Settings\n## DAY/TIME - Set Day and Time\n## HEAT - Heat Mode\n## COOL - Cool Mode\n## HOLD - Temperature Hold Mode\n## PROG - Thermostat Programming\n## FAN - Controlling Fan Operation\n## SETTINGS - Filter and Maintenance Reminders\n## SETTINGS - Balance Point\n## Service Indicator\n## Thermostat RESET\n## Removing/Installing Thermostat\n## Default Thermostat Settings\n## Technical Specifications\n## Thermostat Output Table","[{\"question\":\"What happens when power is first applied to the Lennox 51M37 thermostat?\",\"answer\":\"The display segments activate as part of initialization. After a short time, the home screen appears with default settings, and about 1 minute later the actual room temperature is shown.\"},{\"question\":\"How do I set the day and time on the thermostat?\",\"answer\":\"Press the DAY/TIME button and adjust hour, minutes, and day of week using the Up/Down arrows. Confirm by pressing DAY/TIME at each step; daylight savings adjustments can be stored by pressing ENTER.\"},{\"question\":\"What is the difference between normal heat mode and emergency heat mode?\",\"answer\":\"In normal heat mode, both the heat pump and backup heat source can provide heat, with the backup activated when the heat pump cannot meet demand. In emergency heat mode, only the backup heat source provides heat and the heat pump is disabled, activating only upon a heat demand.\"}]","51M37 Merit® Series Thermostat - Operation Manual - 5/2 Day Programmable Thermostat | PDF",1792777794,136]