Lennox International Inc 51M37 operation manual 51M38 Series 5/2

Page 49

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 disable heat mode. If the thermostat is in cool or off mode, pressing the HEAT button enables the heat mode (indi- cated by HEAT in the lower right corner − see figure 4).

 

 

Turn Heat ON/OFF

 

 

 

Heat

Cool

 

 

 

Prog

Auto

 

 

5:30

 

 

 

82

Copy Day/Time

 

 

 

 

 

70

66

Fan

Hold

(DOOR

 

 

 

 

 

 

OPEN)

 

 

Settings Enter

 

 

 

 

(Outside)

 

Figure 4

If the thermostat is in heat mode, heat mode is disabled when the HEAT button is pressed. This is indicated by OFF near the right side of the display as shown in figure 5.

Heat/Cool Mode Disabled

ROOM

 

 

 

OFF

75°

75°

 

 

HEAT SETPOINT

 

 

 

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

 

72°

HEAT SETPOINT

75° HEAT

Figure 6

Heating operation is indicated by a flame icon in the lower right corner. 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.

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 indi- cated by COOL on the right side of the display (see figure 7).

 

 

Turn Cool ON/OFF

 

 

 

Heat

Cool

 

 

 

Prog

Auto

 

 

i0:30

 

 

 

70

Copy Day/Time

 

 

 

 

 

75

66

Fan

Hold

(DOOR

 

 

 

 

 

 

OPEN)

 

 

Settings Enter

 

 

 

 

(Outside)

 

Figure 7

If the thermostat is in cool mode, pressing the COOL but- ton disables cool mode (indicated by OFF, similar to 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 7, the thermo- stat detects a cooling demand and will activate the cooling equipment to satisfy the demand.

Cooling operation is indicated by flashing nowflake" icons in the display. 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.

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.

NOTE − The cooling setpoint cannot be lower than the heating setpoint. Also, the difference between the cooling and heating setpoint must be at least 4 degrees.

AUTO − Using the Autochangeover Mode

When in either heat mode or cool mode, autochangeover can be enabled or disabled by pressing the AUTO button. If enabled, AUTO appears at the lower right corner of the dis- play. The thermostat will then automatically change over from heating to cooling and vice versa, to keep the room temperature in between the heating and cooling setpoints. Autochangeover can be used in either of the thermostat hold modes, or when the thermostat program is running. These modes are described later.

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51M38 SERIES 5/2

Page 48 Page 50
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Page 48 Page 50
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.
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