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 SYSTEM box as shown in figure 4.

 

 

Normal Heat Mode Enabled

 

 

 

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

Enabling Emergency Heat Mode

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

Emergency Heat Mode Enabled

ROOM

SYSTEM

62°

SETPOINT

75° EMG.

 

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 in the SYSTEM box as shown in figure 6.

Heat Mode Disabled

ROOM

SYSTEM

°SETPOINT

75 75° OFF

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 the SYSTEM box.

Heating Demand

ROOM

SYSTEM

SETPOINT

72°

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 51M37 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 Demand

ROOM

 

 

 

SYSTEM

 

65

°

SETPOINT COOL

 

75

°

OFF

Hi

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HEAT

 

Figure 8

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51M37 SERIES 5/2

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Lennox International Inc 51M37 operation manual Fan, Heat − Using the Heat Mode

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.