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 51M38 thermostat output states for var- ious input conditions.

Table 4

Thermostat Outputs

Condition

W1

Y1

G

 

 

 

 

Gas Heat, Auto Fan

Heat Demand

X

 

 

 

 

 

 

Cool Demand

 

X

X

 

 

 

 

No Demand

 

 

 

 

 

 

 

Gas Heat, Continuous Fan

 

 

 

 

 

 

Heat Demand

X

 

X

 

 

 

 

Cool Demand

 

X

X

 

 

 

 

No Demand

 

 

X

 

 

 

 

Electric Heat, Auto Fan

 

 

 

 

 

 

Heat Demand

X

 

X

 

 

 

 

Cool Demand

 

X

X

 

 

 

 

No Demand

 

 

 

 

 

 

 

Electric Heat, Continuous Fan

 

 

 

 

Heat Demand

X

 

X

 

 

 

 

Cool Demand

 

X

X

 

 

 

 

No Demand

 

 

X

 

 

 

 

NOTE − X = output is activated with 24VAC.

Technical Specifications

Thermostat Type

Electronic programmable thermostat for 1-Stage Heat/1-Stage Cool, gas or electric heat, non−heat pump, non−power robbing applications.

Power Supply Range

18VAC − 30VAC (24VAC nominal), 60Hz

CAUTION

24VAC is present on the terminals of the thermostat bracket. If removing the thermostat from the wall, use caution and avoid touching any of the connec- tor terminals on the wall bracket.

Also, when working with the thermostat dip switches, use a non−conductive tool and take cau- tion to avoid making any contact with the circuit board, its imprinted circuitry and its connector prongs.

Temperature Display

Display Scale: Fahrenheit or Celsius user selectable (via DIP switch; see figure 17)

Display range: 35°F (2°C) to 99°F (37°C)

Display resolution: 1°F (1°C)

Display Accuracy: +/−1°F

If the Fahrenheit/Celsius display must be changed, use a plastic, non−conductive tool to push the dip switch to the right position (see figure 17).

 

Changing Fahrenheit/Celsius Setting

1

 

2

 

3

 

4

 

5

 

6

PLUG IN (Use Care To Avoid Bending Prongs.)

7

 

 

F/C (Fahrenheit/Celsius) switch

 

shown in Celsius position

Figure 17

Indoor Temperature Measurement Range

Measurement Scale: Fahrenheit

Measurement Range: 35°F to 99°F

Measurement Resolution: 0.5°F

Measurement Accuracy: +/−1°F

Field Offset: via DIP switches to +/−3°F

Sampling Method: temperature measurements sampled every 15 seconds. Displayed temperature is the average of the last four measurements.

Outdoor Temperature Measurement Range

Measurement Scale: Fahrenheit

Measurement Range: −22°F to 122°F

Measurement Resolution: 1°F

Measurement Accuracy: +/−2°F

Temperature Setpoint Range

Setting range: 50°F (10°C) to 90°F (32°C)

Setting resolution: 1°F (1°C)

Page 7

51M38 SERIES 5/2

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Lennox International Inc 51M37 operation manual Thermostat Output Table

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.

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