Lennox International Inc 51M37 Heat − Using the Heat Mode, Large Heat Heating Demand

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HEAT − Using the Heat Mode

Normal Heat Mode

In normal heat mode, both the heat pump and the backup heat source are used to provide heat. If the thermostat de- tects that the heat pump is not able to provide enough heat (as may be the case in very cold weather), then the backup heat source is activated.

Emergency Heat Mode

In emergency heat mode, only the backup heat source provides heat

heat source is activated only when there is a heat demand.

Enabling Normal Heat Mode

Use the HEAT button to select normal heat mode, emer- gency heat mode, or to disable heat modes as desired. If the thermostat is in off or cool mode, pressing the HEAT button enables heat mode. This is indicated by HEAT in the lower right corner (see figure 4).

 

Normal Heat Mode Enabled

 

 

 

Heat

Cool

 

 

5:30

Prog

Auto

 

 

 

 

 

 

82

Copy Day/Time

 

 

 

 

 

70

70

Fan

Hold

(DOOR

 

 

 

 

 

 

OPEN)

 

 

Settings Enter

 

 

 

 

(Outside)

 

Figure 4

Enabling Emergency Heat Mode

If the thermostat is in heat mode, pressing the HEAT button enables emergency heat mode (see figure 5). If the ther- mostat is in normal heat mode when the HEAT button is pressed, then emergency heat mode is enabled.

Emergency Heat Mode Enabled

ROOM

 

62°

HEAT SETPOINT EMG.

75° HEAT

Figure 5

Disabling Heat Mode

If the thermostat is in emergency heat mode when the HEAT button is pressed, then heat modes are disabled. This is indicated by OFF near the right side of the display as shown in figure 6.

Heat Mode Disabled

ROOM

 

OFF

 

75°

75°

 

 

 

HEAT SETPOINT

 

 

 

 

Figure 6

 

 

 

Heating Demand

The thermostat must be in either normal or emergency heat mode in order to properly control the heating equip- ment. In either heat mode, when the actual temperature is lower than the temperature setpoint (as shown in figure 7), the thermostat detects a heating demand and activates the heating equipment to satisfy the demand. Heating opera- tion is indicated by a flame icon in bottom right−hand corner of the display.

Heating Demand

ROOM

 

72°

HEAT SETPOINT

75° HEAT

Figure 7

When the actual temperature rises above the temperature setpoint, the flame icon will disappear. This indicates that the heating demand has been satisfied and that the heat- ing equipment has been turned off.

Heat pump operation is locked out for 5 minutes after a de- mand has been satisfied. 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−min- ute delay has elapsed.

NOTE − The heat pump is activated for at least 4 minutes if no buttons are pressed during the demand interval. The backup heat source is activated for at least 3 minutes if no buttons are pressed during the demand interval.

If your system supports 3−stage heating (as does the 51M42 thermostat), you may notice various heating levels being delivered during a demand.

If a small heat pump heating demand is present, "Lo" is dis- played in the SYSTEM box; if a large heat pump heating demand is present, "Hi" is displayed (see figure 8).

Large Heat Heating Demand

ROOM

 

 

65

°

75°

Hi

 

 

HEAT SETPOINT

 

 

 

 

HEAT

 

 

 

Lo

Figure 8

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51M42 SERIES 5/2

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Contents 51M37 Merit Series Home Screen Buttons, Backlight, Timers & SettingsDAY/TIME − Setting the Day and Time Thermostat ButtonsFAN Heat − Using the Heat ModeTurn Cool ON/OFF Cool − Using the Cool ModeEnabling and Disabling Cool Mode Cool Mode DisabledPM I036 FAN I036 FANFAN − Controlling the Fan Operation Settings − Filter/Maintenance RemindersRemoving/Installing Thermostat Settings − Balance PointService Indicator Thermostat ResetTechnical Specifications Default Thermostat SettingsMaintenance Reminder Smart Setback Recovery via DIP switch #6Equipment Protection Timers Over−Temperature ProtectionThermostat Output Table Cooling DemandsHeating Demands 51M35 Merit Series Thermostat 51M35 Merit Series505049M 5/1/05 Turn Heat ON/OFF Heat − Using the Heat Mode Cool − Using the Cool ModeEnabling and Disabling Heat Mode Heat/Cool Mode DisabledHold − Using Temperature Hold Modes 1st press I0i4 Removing and Installing Thermostat51M35 Terminal Designations Electric Heat, Auto Fan Thermostat OutputsGas Heat, Auto Fan Gas Heat, Continuous Fan51M34 Merit Series Thermostat 51M34 Merit Series505048M 5/1/05 51M34 Series 5/2 I036 FAN OFF I0i4 51M34 Terminal Designations Heat Demand Cool Demand No Demand 51M39 Merit Series Thermostat 51M39 Merit SeriesI026 Heat/Cool Mode Disabled Cooling Demand 530I030 Auto − Using the Autochangeover Mode Copy a Programmed Day to An other Day Service Indicator Flashing Displaying Outside TemperatureCheck Outside Temperature Filter Maintenance IndicatorsDefault Program Settings Time & Temp 51M39 Terminal Designations Indoor Temperature Measurement RangeOutdoor Temperature Measurement Range Autochangeover Deadband Selection via DIP switch #7Thermal-mechanical switch opens W1 and W2 at 93F+/−6F Page 51M42 Merit Series 51M42 Merit Series Thermostat−Day Programmable Thermostat 505069M 07/05 Large Heat Heating Demand FAN Auto MID Reminder Settings Display Using Fan on I026 With Electric Backup no outdoor sensor Default Program Settings − Time & TempTechnical Specifications 51M42 Terminal Designations 51M38 Merit Series Thermostat 51M38 Merit SeriesY/TIME button 51M38 Series 5/2 Hold − Using Temperature Hold Modes Repeat steps a and B for as many days as you Settings Thermostat Output Table 51M38 Terminal Designations

51M37 specifications

Lennox International Inc, a prominent player in the heating, ventilation, and air conditioning (HVAC) market, has made significant strides in innovation and technology in recent years. Among its notable offerings is the Lennox 51M37, a well-engineered component designed to enhance HVAC efficiency and reliability.

The 51M37 is primarily known for its advanced motor technology, incorporating ECM (Electronically Commutated Motor) design, which significantly reduces energy consumption compared to traditional motor systems. This motor type is key to Lennox's commitment to sustainability, as it not only maintains optimal performance but also minimizes the carbon footprint associated with residential and commercial heating and cooling tasks.

A standout feature of the 51M37 is its intelligent control system, which allows for more precise management of airflow and temperature. This technology can adapt to specific environmental conditions and consumption patterns, optimizing performance and providing substantial cost savings on energy bills. The integration of smart technology aligns with modern demands for energy efficiency and control, making the 51M37 a vital component in achieving higher energy ratings for HVAC systems.

In terms of compatibility, the 51M37 is engineered to work seamlessly with a variety of Lennox heating and cooling units, ensuring versatility for both new installations and retrofits. This compatibility enhances system integration, resulting in improved overall performance.

The construction of the 51M37 emphasizes durability and reliability, featuring high-quality materials that withstand the challenges of constant operation. Its robust design is perfect for diverse environments, ensuring that it functions reliably in both residential settings and commercial applications.

Another characteristic worth noting is the user-friendly installation process, allowing HVAC technicians to install the 51M37 with relative ease. This not only reduces labor costs but also ensures that the system can commence operation quickly without extensive downtime.

Overall, Lennox International's 51M37 embodies innovation, efficiency, and reliability in HVAC technology. With its advanced ECM motor, intelligent controls, and durable construction, it stands as a prime example of how modern HVAC solutions can lead to enhanced performance and energy savings. As the industry continues to evolve, products like the 51M37 will play a critical role in shaping the future of heating and cooling, aligning with sustainability goals and meeting the needs of consumers.
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