Lennox 51M32 Thermostat Manual | Easy-to-Use & Efficient Temperature Control

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E2003 Lennox Industries Inc.

Dallas, Texas, USA

MeritR Series Thermostat

The Lennox Merit® Series Thermostat 51M32 is a nonpro- grammable electronic thermostat that is easy-to-use and has a large, easy-to-read display and excellent tempera- ture control. The thermostat also includes a programmable filter change reminder and a system check indicator. The system check indicator will notify the user of the need for equipment service.

Thermostat 51M32 is suitable for non-heat pump, single− stage heat/single cool applications that are matched with a

OPERATION

MANUAL

Merit® Series Thermostat

CONTROLS (51M32)

504,865M

09/04

Litho U.S.A.

RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Table of Contents
Merit® Series Thermostat	1
General	1
Introduction	1
Initial Thermostat Power-up	1
Heating Control	2
Cooling Control	3
Adjusting Temperature Setpoint	3
Fan Control	4
Filter Reminder	4
Service Indicator	5
Thermostat Reset	5
Default Thermostat Settings	5
Technical Specifications	5
Thermostat Output Table	6
Display − Initial Power−Up

gas or electric furnace.

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 51M32. Refer to the installation manual for instructions re-

ROOM

SETPOINT

FILTER SERVICE

FAN

AUTO

SYSTEM COOL OFF EMG.

HEAT

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.

Figure 1

All display segments are momentarily activated. This oc- curs as a normal part of thermostat initialization. Within a few seconds, the display will appear as shown in figure 2 (figure shows temperature in Fahrenheit units).

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