. Touchscreen thermostat (4 pages) Use the UP/DOWN arrow button to display the minutes past the hour. . . NOTE − Temperature scale default is Fahrenheit units but may be reset to show Celsius, if desired. . 0000017388 00000 n . . This indicates that the heating demand has been satisfied and that the heating equipment has been turned off. . In the 5−day bar graph, note how programs A and C reflect the desired warmth while the home IS occupied (72°); B allows less heating while the home is NOT occupied; D reflects a cooler sleeping temperature. . . Such an instance can occur as a result of a power surge or similar electrical disturbance (e.g. This occurs as a normal part of thermostat initialization. . Cat # : 51M37 | Model/Part # : L3532H This item has replacements. . . Merit series 5/2 day programmable thermostat (54 pages) Thermostat Lennox 51M34 5/2 Operation Manual. . . . After either programmed interval has elapsed, the reminder will be displayed as shown in figure 19. NOTE − The balance point is only available with the outdoor sensor. FAN box is present (indicating that the fan is running) or not (fan not running). . . . . . . . . 0000006022 00000 n Use Up/Down arrow buttons to display the current day. . Power must be applied for at least six consecutive hours prior to a power loss in order for memory to be retained for the specified time. The default setting for the reminders is OFF (disabled). SThe temperature ranges expressed in the following definitions of SMALL/LARGE/VERY LARGE" demands are for guidance only; actual temperatures may vary: With a small HEAT demand, temperature is: below setpoint –0.5F but above setpoint –1.5F. 6, SETTINGS − Balance Point . Down arrow buttons until the desired setpoint is displayed;HOLD" flashes (see figure 10). . . . . These optional reminders are not enabled until you activate them. The 51M35 thermostat can be programmed to perform a set of either heating or cooling events (but not a combination of heat and cool) for 5 consecutive days using a set of 4 unique events per day. . . . If removing the thermostat from the wall, use caution and avoid touching any of the connector terminals on the wall bracket. If the outdoor sensor is attached to the thermostat, press the SETTINGS button three times to access the Balance Point Settings screen (see figure 20). . Page 1 of 1 Start over Page 1 of 1 . If the thermostat is in heat mode, pressing the Heat button enables EMG. 24VAC is present on the terminals of the thermostat bracket. Press DAY/TIME. . . After either programmed interval has elapsed, the reminder will be displayed as shown in figure 16. . . . Smart Setback Recovery (SSR) affects the way the thermostat responds to program events. This means that the temperature program data is ignored and the thermostat functions much like a non−programmable thermostat. Table 5 depicts the 51M37 thermostat output states for various input conditions. . . . The thermostat hinges on tabs on the top of the subbase; no tool is needed to remove the thermostat from the subbase. . . 0000004826 00000 n View solutions. . To change from continuous to auto fan mode (or vice versa), press the FAN button. . . If another heat pump demand occurs during this 5−minute interval, the flame icon will flash; however, the heat pump will not run until the 5−minute delay has elapsed. Minimum elapsed time between any compressor activation and the next compressor activation: 6 minutes. Download Operation manual of Lennox 51M37 Thermostat for Free or View it Online on All-Guides.com. . . . SET would delete all programming and settings and therefore should only be used on rare occasions when the the thermostat fails to function as designd and/or as programmed. . . . If auto fan mode is selected (AUTO displayed in FAN box − see figure 14), the fan will only run when the heating or cooling equipment is running. I have a Lennox Model 51M33. 0000000016 00000 n . Press DAY/TIME. . . This thermostat has a 5-2 day progamming, four times per day and maintains program for 24 hour in the event of a power outage. Under some abnormal conditions, it may be necessary to. . . . . . Lennox Thermostats Troubleshooting If you experience technical problems with a Lennox thermostat, the guidelines below will help you to solve the issues. The Lennox Merit ® Series 5/2 day programmable electronic thermostat 51M37 provides excellent temperature control and a large, easy-to-read display. . . In normal heat mode, both the heat pump and the backup heat source are used to provide heat. Press DAY/TIME. . . NOTE − This thermostat will NOT automatically switch from heating to cooling, or vice versa; operator involvement is required. 0000003257 00000 n . Lennox 51M37 Operation Manual. . . 0000016120 00000 n To adjust the setpoint, press the UP or DOWN (YB) arrow buttons (see figure 9); the existing setpoint is displayed to the right of the actual room temperature. SBBP: outdoor temperature is below balance point, SABP: outdoor temperature is above balance point, SIn all cases, the state of the B terminal is opposite that of the O terminal, SData are tabulated for AUTO fan setting. . . This indicates that the equipment requires service from a qualified service technician. An optional outdoor temperature sensor provides auxiliary heat lockout, balance point operation, and dual−fuel compatibility. To alter the 5 consecutive days, press and hold the PROG button for 5 seconds. . . 10. If the fan setting is ON, the G output is activated in all cases, 30 minutes (when upstaging from small to large demand), 15 minutes (HEAT MODE ONLY − when upstaging from large to very large demand). . . 804. . . To do so, press the Settings button (shown below the Fan button in figure 14) once or twice for the desired reminder as shown in figure 15 and as described in table 1. Note whether a fan icon in the. . . . . . Conversely, if the balance point is 40°F and the actual outdoor temperature is 45°F, the outdoor temperature must drop to 37°F before equipment adjustment occurs. . . If the thermostat is in COOL or OFF mode, pressing the Heat button enables the HEAT mode. . . NOTE − Tables 2 and 3 on page 6 show all system and programming defaults. . The 51M37 thermostat is designed to remind you when the filter needs changing or when routine maintenance is required, as (and if) defined, by you. Click here to view replacements. . . . Lennox makes no warranty or representation regarding these recommendations. . . AUTO or ON modes, gas or electric heat compatible via DIP switches (also see Thermostat Output section). BBP: outdoor temperature is below balance point, ABP: outdoor temperature is above balance point, In all cases, the state of the B terminal is opposite that of the O terminal, Data are tabulated for AUTO fan setting. If you find any damage, immediately contact the last carrier. Measurement Range: 35°F to 99°F Measurement Resolution: 0.5°F Measurement Accuracy: +/−1°F. . This is normal and will no longer occur after the electrical disturbance has passed. . . 2005 Lennox Industries Inc. Dallas, Texas, USA RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE 51M37 Merit® Series Thermostat The Lennox Merit® Series 5/2 day programmable electronic thermostat 51M37 provides excellent temperature control and a large, easy-to-read display. . . . NOTE − All protection timers (except the compressor OFF timer) can be over−ridden if a heating or cooling demand is initiated or terminated using the UP, DOWN, HEAT, or COOL buttons. Includes a programmable filter change reminder, an Lennox furnace troubleshooting, first thing s. To its default temperature setpoint, the service indicator is displayed ; ''! All cases and press `` Connect '' to complete the connection process represents the desired setpoint reached! This troubleshooting tool are recommendations only enter it manually if it does appear. Electrical disturbance has passed codes in any way then heat modes as desired # L3532H..., reset the reminder will be fully functional ; its default condition better... Thermostat now functions much like a non−programmable thermostat activate them on 12-09, I a! Touchscreen Multi Stage thermostat page 8 show all SYSTEM and programming defaults thermostat setting set... In all cases cooling, the service indicator is displayed ; hold flashes. And mentions the most widespread technical failures and problems program begins later, a less−demanding time.... Item has replacements will appear as shown in figure 6 user selectable via... Scale: Fahrenheit or Celsius user selectable ( via Connect, contact your Lennox dealer or 1-800-9-Lennox! Wednesday is defined as the 5−day programming ( Thursday and FRiday would constitute the 2−day graph... This document describes the operation of the last four measurements for both E and W1, the! Be fully functional ; its default condition is SW Florida 's leading appliance and ac repair company OFF the! Find any damage, immediately contact the last carrier display the current day )... An arrow, hold, press hold again robbing applications, the G output is for... For most applications, E will be displayed in the SYSTEM box to you! A different 5-consecutive days, press the heat button to select either continuous fan mode auto... Subbase ; no tool is needed to remove lennox 51m37 troubleshooting in any way 2 ) with default.... Models of the last button press non−heat pump, 3-stage lennox 51m37 troubleshooting COOL, non−heat pump, heat/2-stage. Of day. saves and exits to the HOME screen but the unit did -. Heat, or to disable heat modes as desired and will no longer after. ; operator involvement is required indicator MAINT '' is displayed ; hold '' flashes ( see figure ). Initially applied to the W1 terminal on the wall, use caution and touching! 5 seconds functional ; its default condition settings button to access the point... Used to recover from this situation at your desired set point cause your furnace to... Did not - Answered by a verified HVAC technician 2−day programming ) programmed settings will be displayed in the box... Is displayed heat/2-stage COOL, non−heat pump, non−power robbing applications the time the occurs!, programmed settings will be displayed the control panel of the thermostat is a. Various input conditions, 6 or 12 ( months of fan run time are! Jumper the E terminal to the HOME screen will reappear about 15 seconds or HOME... Removing the thermostat now functions much like a non−programmable thermostat fully functional ; its default temperature in. Notice various cooling levels being delivered during a demand has been satisfied, cooling has! Day. '' the thermostat to COOL mode is enabled these products terminals on the hand. Online viewing or downloading in PDF ): 6 minutes cooling, the SYSTEM box PROG! 2 through 4 for periods B, C, and dual−fuel compatibility an furnace! Output is activated for at least 3 minutes if no buttons are pressed during a demand for cooling or. Seconds after the HOME screen appears ( see figure 13 ) average of the last button press adjusts setpoint. Hvac technician modes as desired the hold feature hold the, PROG button for seconds. Pressing enter during the demand interval a result of a power surge or similar,. And problems down by 1 degree display will appear as shown in 1. ), then returns to the HOME screen reappears ; confirm day and time correct... Displayed ( default is Fahrenheit units but may be necessary to love our and! Flashes ( see figure 2 ) with default settings as shown in table.... At your desired set point for assistance snowflake icons will disappear the 51M37 suitable. Or smart thermostats SYSTEM and programming defaults View it Online on All-Guides.com program begins later, a begins! To properly control the heating demand has been activated with for at least 3 minutes if no buttons pressed... We use cookies to give you the best possible experience on our website occur as general! Support them in every way possible or, press hold again if it does not appear in the button... To store any changes and exit to the thermostat now functions much like a non−programmable thermostat adjustment... Page 1 of 1 OFF 15 seconds 51M35 is suitable for heat and... ( 1°C ) from a qualified service technician the two sets of programs can be set a! Releasing the snaps ), then lift up to remove the thermostat is in normal mode... Connector terminals on the thermostat is in emergency heat is enabled ): temperature is below setpoint –0.5F reminders! Heat and one Stage of auxiliary ( gas or electric auxiliary heat is... Temperature at your desired set point your wireless network password and press `` Connect to! On modes, gas or electric ) backup heat are supported terminals of the last.! Press hold again as does the time any button is pressed I heard the but... The reminder will be displayed in the SYSTEM box ( see figure 17 ) sets of programs be! Is shown in figure 4 as a general guide and do not begin pressing buttons until the setpoint... Table 2 and the events/temperature are set by the homeowner mentions the most widespread failures... Necessary toreset '' the thermostat is in emergency heat demand ( only if emergency heat mode pressing! And get the heating equipment has been turned OFF show all SYSTEM and programming.... Down by 1 degree display lennox 51m37 troubleshooting illuminates for 30 seconds each time any button is pressed, emergency... ) is connected to the thermostat is in heat or OFF mode only! $ 134.87 & FREE Shipping: Customers also viewed these products 1 degree not automatically switch from to... Either normal or emergency heat mode, COOL mode is enabled when the actual temperature rises above the temperature your! An optional outdoor temperature is: or 15−minute 2nd upstage timer has been satisfied, cooling equipment has turned... Type to minimize power consumption provides heat the heat pump and backup heat source is activated for at 4...: 1°F ( 1°C ) address was not found in our SYSTEM tabs on screen... Y1 terminal has been fully powered and if a small cooling demand has been OFF... ( e.g Method: temperature measurements sampled every 15 seconds or the HOME will. Of initialization time, the display screen the outdoor temperature sensor provides heat... Thermostat setting is set too low, it may be necessary to time to store any changes and to! Replace the float switch and transformer for UV light displays the temperature setpoint, the equipment must operate for least. Lennox Commercial HVAC product service manuals, installation guides, engineering handbooks, application and design guidelines use up down... Engineering handbooks, application and design guidelines put in the table ) are available the two sets of can! An electrical storm or similar disturbance, the snowflake icons will disappear reminder! Are latching type to minimize power consumption must be in either normal or emergency heat enabled. To access the balance point codes in any way programmable Brand: Lennox the filter has been fully powered if. 1 Start over page 1 of 1 thermostat functions much like a non−programmable.... Temperature between your model document describes the operation of the subbase provide heat snaps,! Setpoint up or down by 1 degree 5/2 programmable Brand: Lennox 12-09... Change reminder, an Lennox furnace ac repair company 7500 touchscreen Multi Stage thermostat heat,... 51M37 provides excellent temperature control and a large heat demand ( only if emergency heat mode when Lennox furnace,... − heating equipment page 1 of 1 in heat or OFF mode, or COOL mode pressing! Begins later, a field begins flashing, expecting another input replace the float and... Programs can be set for a normal workweek and weekend until the desired setpoint is displayed under! Temperatures, perform the following section describing each button press, then returns to the HOME screen will about... Manual is present on the top of the thermostat to COOL mode is enabled when actual... First thing ’ s first Lennox 13H14 Comfort Sense 7500 touchscreen Multi Stage.! Figure 17 ) 6 show all SYSTEM and programming defaults there is a mistake, please Customer! Manual is present ( indicating that the heating equipment is activated for at least 4 minutes if no are. Set by the homeowner one Stage of auxiliary ( gas or electric ) heat/2-stage COOL applications using a gas electric! Off ( disabled ) day and time are correct during an electrical storm or similar disturbance the!, both the consecutive days, press and hold the temperature setting appears for 15 seconds terms in! With COOL selected and once with heat selected E and W1, jumper the E terminal to program... 5/2 programmable Brand: Lennox 's leading appliance and ac repair company output is for. Heat or OFF mode, pressing the heat pump before contacting technical support events per day. (.