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2003 Lennox Industries Inc.

Dallas, Texas, USA

OPERATION

MANUAL

Merit

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

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-

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.

Litho U.S.A.

Merit

Series Thermostat

CONTROLS (51M32)

504,865M

09/04

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

Figure 1

ROOM

SETPOINT

FILTER

SERVICE

FAN

AUTO

SYSTEM

COOL

OFF

EMG.

HEAT

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).

1 2 3 4 5 6 ... 13 14

Inhaltsverzeichnis

Seite 1 - OPERATION

Page 1®2003 Lennox Industries Inc.Dallas, Texas, USAOPERATIONMANUALMeritR Series ThermostatThe Lennox Merit® Series Thermostat 51M32 is a nonpro-gram

Seite 2 - Heating Control

Page 4Setpoint Display and AdjustmentFigure 9ROOMSETPOINT6964FANAUTOSYSTEMHEATAfter the desired setpoint is reached, the HOME screen willreappear afte

Seite 3 - Cooling Control

Page 5Figure 13Display of Filter ReminderROOM72FILTERFANAUTOSYSTEMHEATBalance PointNOTE − The balance point is only available with the out-door senso

Seite 4

Page 6Default Thermostat SettingsDefault Thermostat settings are in table 1.Table 1Default Thermostat SettingsMode HeatSetpoint 70°F (or 21°C)Fan Au

Seite 5

Page 7Service ReminderThe SERVICE indicator is displayed only under the follow-ing conditions: if the thermostat Y1 terminal has been activatedwith 2

Seite 6

Page 8Table 3Thermostat Output StatesCondition W1 Y1 G O EElectric Heat Backup − No Outdoor Sensorsmall heat demand X Xlarge heat demand X X Xemergenc

Seite 7

Page 2Display − Home ScreenFigure 2ROOM70FANAUTOSYSTEMHEATFigure 2 illustrates the HOME screen. Note that an indoorroom temperature of 70°F is initial

Seite 8

Page 3Figure 6Heating DemandROOM7288FANAUTOSYSTEMHEATWhen the actual temperature rises above the temperaturesetpoint, the flame icon will disappear. T

Seite 9

Page 4Fan ControlThe FAN button is located behind the small door on theright-hand side of the thermostat. See figure 3. The FANbutton can be used to s

Seite 10 - Filter Reminder

Page 5Service IndicatorWhen abnormal equipment operation is detected, theSERVICE indicator will flash on the upper-right corner ofthe screen. This ind

Seite 11 - Thermostat RESET

Page 6Equipment Protection OverrideBoth the minimum compressor OFF timer and the mini-mum equipment cycle timer can be over−ridden by press-ing and ho

Seite 12 - Technical Specifications

Page 1®2003 Lennox Industries Inc.Dallas, Texas, USAOPERATIONMANUALMeritR Series ThermostatThe Lennox Merit® Series Thermostat 51M33 is a nonpro-gram

Seite 13 - IMPORTANT

Page 2Display − Home ScreenFigure 2ROOM70FANAUTOSYSTEMHEATFigure 2 illustrates the HOME screen. Note that an indoorroom temperature of 70°F is initial

Seite 14

Page 3Figure 6Heat Mode DisabledROOMSETPOINT6964FANAUTOSYSTEMOFFHeating DemandThe thermostat must be in either normal or emergencyheat mode in order t