Lennox International Inc 51M37 Heat − Using the Heat Mode Cool − Using the Cool Mode

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HEAT − Using the Heat Mode

COOL − Using the Cool Mode

Enabling and Disabling Heat Mode

The thermostat must be in the HEAT mode to control the heating equipment. Press the Heat button to enable or dis- able HEAT mode. If the thermostat is in COOL or OFF mode, pressing the Heat button enables the HEAT mode (indicated by HEAT in the SYSTEM box − see figure 4).

 

 

 

Turn Heat ON/OFF

 

 

 

 

Heat

Cool

MO

 

 

 

 

 

AM

5:30 FAN

Prog

Day/Time

PM

 

HOLD

AUTO

 

 

 

 

 

 

 

SYSTEM

 

 

ROOM

SETPOINT

 

 

 

66° 70° HEAT

Fan

Hold

 

 

 

 

Settings Enter

Figure 4

If the thermostat is in heat mode, pressing the Heat button disables HEAT mode (indicated by OFF in the SYSTEM box − see figure 5).

Heat/Cool Mode Disabled

ROOM

SYSTEM

°SETPOINT

75 75° OFF

Figure 5

Heating Demand

Set the thermostat to heat mode to control the heating equipment. Then, if the room temperature is lower than the temperature setpoint, as shown in figure 6, the thermostat detects a heating demand and will activate the heating equipment to satisfy the demand.

Heating Demand

ROOM

SYSTEM

SETPOINT

72°

75°

 

HEAT

 

Figure 6

Heating operation is indicated by a flame icon in the SYS- TEM box. 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 heating equipment has been turned off.

If your system supports 2−stage heating (as does the 51M35 thermostat), you may notice various heating levels being delivered during a demand.

NOTE − Heating equipment is activated for at least 3 min- utes if no buttons are pressed during the demand interval.

Enabling and Disabling Cool Mode

Use the COOL button to enable or disable cool mode as desired. If the thermostat is in HEAT or OFF mode, cool mode is enabled when the COOL button is pressed. This is indicated by COOL in the SYSTEM box (see figure 8).

 

 

Turn Cool ON/OFF

 

 

Heat

Cool

MO

 

 

 

AM I0:30

FAN

Day/Time

 

HOLD

Prog

 

AUTO

 

ROOM

 

SYSTEM

 

SETPOINT COOL

 

75° 70°

Fan

Hold

 

 

Settings Enter

Figure 7

If the thermostat is in cool mode, pressing the Cool button disables COOL mode (indicated by OFF in the SYSTEM box − see figure 5).

Cooling Demand

Set the thermostat to cool mode to control the cooling equipment. Then, if the room temperature is higher than the temperature setpoint, as shown in figure 8, the thermo- stat detects a cooling demand and will activate the cooling equipment to satisfy the demand.

 

Cooling Demand

 

ROOM

 

 

 

SYSTEM

75

°

SETPOINT

 

COOL

70

°

OFF

 

Hi

 

 

 

 

HEAT

 

 

 

 

Figure 8

Cooling operation is indicated by flashing nowflake" icons in the SYSTEM box. When the actual temperature drops below the temperature setpoint, the snowflake icons will disappear. This indicates that the cooling demand has been satisfied and that the cooling equipment has been turned off.

If your system supports 2−stage cooling (as does the 51M35 thermostat), you may notice various cooling levels being delivered during a demand. Also, if a small cooling demand is present, "Lo" will be displayed in the SYSTEM box. However, if a large cooling demand is present, "Hi" will be displayed in the SYSTEM box (shown in figure 8).

NOTE − If no buttons are pressed during a demand for cooling, the equipment must operate for at least 4 minutes. After a demand has been satisfied, cooling equipment op- eration is locked out for 5 minutes. If another cooling de- mand occurs during this 5−minute interval,

snowflakes will flash; however, the cooling equipment will not operate until the 5−minute delay has elapsed.

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51M35 SERIES 5/2

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Contents 51M37 Merit Series DAY/TIME − Setting the Day and Time Buttons, Backlight, Timers & SettingsThermostat Buttons Home ScreenFAN Heat − Using the Heat ModeEnabling and Disabling Cool Mode Cool − Using the Cool ModeCool Mode Disabled Turn Cool ON/OFFPM I036 FAN I036 FANFAN − Controlling the Fan Operation Settings − Filter/Maintenance RemindersService Indicator Settings − Balance PointThermostat Reset Removing/Installing ThermostatTechnical Specifications Default Thermostat SettingsEquipment Protection Timers Smart Setback Recovery via DIP switch #6Over−Temperature Protection Maintenance ReminderCooling Demands Thermostat Output TableHeating Demands 51M35 Merit Series Thermostat 51M35 Merit Series505049M 5/1/05 Enabling and Disabling Heat Mode Heat − Using the Heat Mode Cool − Using the Cool ModeHeat/Cool Mode Disabled Turn Heat ON/OFFHold − Using Temperature Hold Modes 1st press I0i4 Removing and Installing Thermostat51M35 Terminal Designations Gas Heat, Auto Fan Thermostat OutputsGas Heat, Continuous Fan Electric Heat, Auto 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 530 Heat/Cool Mode Disabled Cooling DemandI030 Auto − Using the Autochangeover Mode Copy a Programmed Day to An other Day Check Outside Temperature Displaying Outside TemperatureFilter Maintenance Indicators Service Indicator FlashingDefault Program Settings Time & Temp Outdoor Temperature Measurement Range Indoor Temperature Measurement RangeAutochangeover Deadband Selection via DIP switch #7 51M39 Terminal DesignationsThermal-mechanical switch opens W1 and W2 at 93F+/−6F Page 51M42 Merit Series Thermostat 51M42 Merit Series−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.