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Lennox MPGA 075 B3 User Manual

Lennox MPGA 075 B3
37 pages
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APPLICATION
GUIDE
GAS FURNACE
Fit’s All 80
English/02-2004
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Lennox MPGA 075 B3 Specifications

General IconGeneral
BrandLennox
ModelMPGA 075 B3
CategoryFurnace
LanguageEnglish

Summary

Safety

Furnace Specifications

Furnace Blower Specifications and Air Flow Data

Furnace Wiring Specifications

Introduction

Site Selection

Guidelines for choosing an appropriate location for furnace installation.

Clearances

Minimum required distances between the furnace and adjacent construction.

Air for Combustion and Ventilation

Contaminated Combustion Air

Hazards and substances to avoid in combustion air to prevent furnace damage.

Adequate Ventilation and Combustion Air

Guidelines for ensuring sufficient air for safe furnace operation and building environment.

Ducting

Ductwork Recommendation

Advice on connecting supply and return ducts to the furnace.

To Convert to Downflow Position

Steps to modify the furnace for downflow installation configuration.

Filters

Venting

Pre-Installation Vent System Inspection

Inspection steps for existing vent systems before furnace installation.

Location Requirements for Horizontal Venting

Clearances required for vent terminals when using horizontal venting.

General Venting Requirements

Rules for common venting and terminating vent systems.

To Convert to Side Flue Exit

For Horizontal Positions

Checking For Vent Oversizing

Carbon Monoxide Poisoning Hazard

Electrical Connections

Gas Connections

Theory of Operation

Here's How Your System Works

Step-by-step process of the furnace's heating cycle and control functions.

Startup and Operational Checkout

Manifold Pressure Adjustment

How to adjust the manifold pressure for optimal gas delivery.

Determining Furnace Input - Natural Gas ONLY

Burner Orifice Sizing

Altitude Derating

Limit Control Checkout

Flame Rollout Switch

Pressure Switch Check

Sequence of Operation

Servicing the Furnace

Combustion Component Check

Annual inspection of key combustion components for safety and performance.

Manifold (or Burner/Manifold) Removal/Replacement

Detailed steps for removing and replacing the manifold or burner assembly.

Blower Removal/Replacement

Lubricating Motors

Wiring Diagram

For Your Safety - Read Before Operating

Operating Your Furnace

Lighting Instructions

Steps for initiating furnace operation, including gas control settings.

Temperature Control

Fan Operation

What to do if your unit is not heating properly

What to do if your unit fails to operate

Maintenance of Your Furnace

Cleaning

Instructions for cleaning the furnace cabinet.

Installations Around Insulation

Precautions regarding insulation clearance around the furnace.

Periodic Inspections

Recommended periodic checks of furnace components.

Combustion Air

Importance of adequate combustion air and avoiding obstructions.

Venting and Furnace Support

Requirements for proper venting and structural support of the furnace.

Return Air

Cleaning/Replacing the Filter

Safety Interlock Switch

Rollout Switch

Lubrication

Burner Flame

Warranty Procedure

Parts Replacement Information Guide

Owner Record

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