Removing and Installing Thermostat

The thermostat hinges on tabs on the top of the subbase; no tool is needed to remove the thermostat from the sub- base. Pivot the bottom of the thermostat outward (releas- ing the snaps), then lift up to remove.

To install it, first position the top tilted toward the wall brack- et and align it until you feel the tabs and slots engage; then, while the top is in place, pivot the bottom toward the wall until the thermostat snaps into place.

Default Thermostat Settings

Default thermostat settings are in table 2 and the default program is shown in table 3.

Table 2

Default Thermostat Settings

Mode

Heat (Perm. Hold)

 

 

Heat Setpoint (Perm Hold)

70°F (or 21°C)

 

 

Cool Setpoint (Perm Hold)

78°F (or 26°C)

 

 

Fan

Auto

 

 

Filter Reminder

OFF

 

 

Maintenance Reminder

OFF

 

 

Equipment Protection Timers

Reset Back to Zero

 

 

Autochangeover

OFF

 

 

Table 3

Default Program Settings (Time & Temp.)

Programs

Time

Temp.− Heat

Temp.− Cool

 

 

 

 

All days − A

6:00am

70_F / 21°C

78_F / 26°C

 

 

 

 

All days − B

8:00am

62_F / 17°C

85_F / 29°C

 

 

 

 

All days − C

6:00pm

70_F / 21°C

78_F / 26°C

 

 

 

 

All days − D

10:00pm

62_F / 17°C

82_F / 28°C

 

 

 

 

Thermostat Output Table

Table 4 depicts the 51M39 thermostat output states for var- ious input conditions. The following notes described terms used in the table.

Table 4

Thermostat Outputs

Condition

W1

W2

Y1

Y2

G

 

 

 

 

 

 

Gas Heat, Auto Fan

 

 

 

 

 

 

 

 

 

 

 

Heat Demand, SMALL

X

 

 

 

 

 

 

 

 

 

 

Heat Demand, LARGE

X

X

 

 

 

 

 

 

 

 

 

Cool Demand, SMALL

 

 

X

 

X

 

 

 

 

 

 

Cool Demand, LARGE

 

 

X

X

X

 

 

 

 

 

 

No Demand

 

 

 

 

 

 

 

 

 

 

 

Gas Heat, Continuous Fan

 

 

 

 

 

 

 

 

 

 

Heat Demand, SMALL

X

 

 

 

X

 

 

 

 

 

 

Heat Demand, LARGE

X

X

 

 

X

 

 

 

 

 

 

Cool Demand, SMALL

 

 

X

 

X

 

 

 

 

 

 

Cool Demand, LARGE

 

 

X

X

X

 

 

 

 

 

 

No Demand

 

 

 

 

X

 

 

 

 

 

 

Electric Heat, Auto Fan

 

 

 

 

 

 

 

 

 

 

 

Heat Demand, SMALL

X

 

 

 

X

 

 

 

 

 

 

Heat Demand, LARGE

X

X

 

 

X

 

 

 

 

 

 

Cool Demand, SMALL

 

 

X

 

X

 

 

 

 

 

 

Cool Demand, LARGE

 

 

X

X

X

 

 

 

 

 

 

No Demand

 

 

 

 

 

 

 

 

 

 

 

Electric Heat, Continuous Fan

 

 

 

 

 

 

 

 

 

 

Heat Demand, SMALL

X

 

 

 

X

 

 

 

 

 

 

Heat Demand, LARGE

X

X

 

 

X

 

 

 

 

 

 

Cool Demand, SMALL

 

 

X

 

X

 

 

 

 

 

 

Cool Demand, LARGE

 

 

X

X

X

 

 

 

 

 

 

No Demand

 

 

 

 

X

NOTE − X = output is activated with 24VAC.

NOTE − The temperature ranges expressed in the follow- ing definitions of

ance only; actual temperatures may vary.

With a SMALL heat demand, temperature is: below setpoint –0.5F but above setpoint –1.5F AND 30-minute upstage timer HAS NOT expired.

With a LARGE heat demand, temperature is: less than setpoint –1.5F

OR 30-minute upstage timer HAS expired.

With a SMALL cool demand, temperature is: above setpoint +0.5F but below setpoint +1.5F AND 30-minute upstage timer HAS NOT expired. With a LARGE cool demand, temperature is: above setpoint +1.5F

OR 30-minute upstage timer HAS expired.

Page 7

51M39 SERIES 5/2

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Lennox International Inc 51M37 operation manual Removing and Installing Thermostat, Default Program Settings Time & Temp
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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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