Lennox International Inc operation manual 51M37 Merit Series

Page 1

E2005 Lennox Industries Inc.

Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

51M37 Merit® Series Thermostat

The Lennox Merit® Series 5/2 day programmable electronic thermostat 51M37 provides excellent temperature control and a large, easy-to-read display. It includes a programmable filter change reminder, an equipment maintenance reminder, and a system check indicator to notify the user when the equipment requires service.

The 51M37 is suitable for heat pump, 3-stage heat/2-stage cool applications using a gas or electric auxiliary heat source. An optional outdoor temperature sensor provides auxiliary heat lockout, balance point operation, and dual−fuel compatibility.

General

These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation.

Check equipment for shipping damage. If you find any damage, immediately contact the last carrier.

Introduction

This document describes the operation of Lennox thermostat 51M37. Refer to the installation manual for instructions re- garding installation and wiring of the thermostat.

Initial Thermostat Power-up

When power is initially applied to the thermostat, the dis- play will appear as shown in figure 1.

OPERATION

MANUAL

51M37 Merit® Series

5/2 Day Programmable Thermostat

CONTROLS

505,050M

05/05Litho U.S.A. Supersedes 03/05

Table of Contents

51M37 Series Thermostat . . . . . . . . . . . . . . . . . . . . . . 1

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Initial Thermostat Power-up . . . . . . . . . . . . . . . . . . . . . 1

Buttons, Backlight, Timers & Settings . . . . . . . . . . . . 2

DAY/TIME − Set Day and Time . . . . . . . . . . . . . . . . . . 2

HEAT − Heat Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

COOL − Cool Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

HOLD − Temperature Hold Mode . . . . . . . . . . . . . . . . 5

PROG − Thermostat Programming . . . . . . . . . . . . . . . 5

FAN − Controlling Fan Operation . . . . . . . . . . . . . . . . . 6

SETTINGS − Filter and Maintenance Reminders . . . 6

SETTINGS − Balance Point . . . . . . . . . . . . . . . . . . . . . 7

Service Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Thermostat RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Removing/Installing Thermostat . . . . . . . . . . . . . . . . . 7

Default Thermostat Settings . . . . . . . . . . . . . . . . . . . . 7

Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . 8

Thermostat Output Table . . . . . . . . . . . . . . . . . . . . . . . 10

 

Initial Power−Up Display

 

MO

TU WE TH

FR SA SU

MAINT

 

 

I8:88

FILTER

 

AM

SERVICE

 

 

PM

FAN

 

PROG A B C D HOLD

ON

 

 

 

 

AUTO

 

 

ROOM

SETPOINT

SYSTEM

 

 

°

COOL

 

 

 

OFF

 

88

88 °

 

EMG.

Hi

 

 

 

HEAT

Lo

Figure 1

All display segments are momentarily activated. This oc- curs as a normal part of thermostat initialization.

05/05

Page 1

505,050M

*2P0505*

*P505050M*

 

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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.
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