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Lennox Merit ML296UH110XV60C User Manual

Lennox Merit ML296UH110XV60C
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Page 1
INSTALLATION
INSTRUCTIONS
ML296UHV
507869-02
06/2019
Supersedes 507869-01
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
This is a safety alert symbol and should never be
ignored. When you see this symbol on labels or in man-
uals, be alert to the potential for personal injury or death.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer (or
equivalent), service agency or the gas supplier.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
© 2019 Lennox Industries Inc.
Dallas, Texas USA
MERIT
®
SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
Contents
Unit Dimensions - inches (mm) ......................................2
ML296UHV Gas Furnace ...............................................3
Shipping and Packing List ..............................................4
Safety .............................................................................3
Use of Furnace as a Construction Heater ......................4
General ...........................................................................5
Combustion, Dilution, Ventilation Air...............................5
Setting Equipment ..........................................................8
Filters ............................................................................13
Duct System ................................................................. 11
Pipe Fittings Specications...........................................14
Joint Cementing Procedure .......................................... 15
Venting Practices ..........................................................16
Gas Piping ....................................................................36
Electrical .......................................................................39
Blower Motor Performance ...........................................42
Integrated Control .........................................................47
Unit Start-Up .................................................................48
Gas Pressure Measurement.........................................49
Proper Combustion.......................................................50
High Altitude .................................................................50
Repair Parts List ...........................................................51
Sequence of Operation.................................................52
Service..........................................................................53
OFF
ON
C
C
HI
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LO
HI
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Lennox Merit ML296UH110XV60C Specifications

General IconGeneral
ModelML296UH110XV60C
BrandLennox
CategoryFurnace
EfficiencyUp to 96% AFUE
Heating Capacity110, 000 BTU
StagesTwo-stage
Blower MotorVariable-Speed
Fuel TypeNatural Gas

Summary

Installation Overview and Safety

Safety and Warnings

Important safety precautions and warnings for installation and operation.

Unit Specifications

Unit Dimensions

Provides physical dimensions and connection port locations for the furnace.

Installation Prerequisites

Shipping and Packing List

Lists items included with the furnace shipment for installation verification.

Building Codes

Outlines requirements for conforming to local and national building codes.

Installation Locations and Usage

Installation Locations

Specifies acceptable locations and clearances for furnace installation.

Use of Furnace as Construction Heater

Details conditions and restrictions for using the furnace as a temporary construction heater.

Airflow and Ventilation Requirements

General Installation Guidelines

Provides general recommendations for furnace placement and operation.

Combustion, Dilution & Ventilation Air

Covers requirements for combustion and ventilation air supply for safe operation.

Confined Space Air Requirements

Confined Space Air Requirements

Defines confined spaces and their air intake requirements.

Air Intake and Ventilation

Air from Outside

Details intake air requirements from outside spaces like attics or crawl spaces.

Equipment Setup

Shipping Bolt Removal

Instructions for removing the blower motor shipping bolt.

Installation - Setting Equipment

Guidelines for properly setting and leveling the furnace unit.

Unit Leveling

Upflow and Horizontal Application Leveling

Illustrates proper leveling procedures for upflow and horizontal furnace installations.

Installation Clearances and Airflow Paths

Installation Clearances

Specifies required clearances to combustible materials and for service access.

Return Air Guidelines

Details how to properly connect the return air system.

Return Air and Panel Removal

Optional Return Air Base

Information on installing an optional return air base for upflow applications.

Removing the Bottom Panel

Procedures for removing and reinstalling the furnace bottom panel.

Horizontal Installation and Support

Horizontal Installation and Support

Covers clearances, suspended, and platform installations for horizontal units.

Air Distribution Components

Filters

Recommends filter types and sizes for optimal system performance.

Supply and Return Air Plenums

Discusses requirements for supply and return air plenums.

Piping and Venting Materials

Pipe & Fittings Specifications

Lists approved materials for gas and condensate piping and fittings.

Joint Cementing Procedure

Joint Cementing Procedure

Provides detailed steps for cementing pipe joints according to ASTM standards.

Venting Practices and Testing

Venting Practices

Covers guidelines for piping suspension, wall thickness, and common vent removal.

Testing for Proper Venting

Outlines procedures for testing venting and combustion air for non-direct vent systems.

Vent Piping Guidelines

Vent Piping Guidelines

Details approved vent pipe types and termination requirements.

Vent Pipe Sizing and Installation

Horizontal Installation Offset Requirements

Specifies requirements for offset configurations in horizontal exhaust piping.

Piping Size Process

Outlines a step-by-step process for correctly sizing vent pipe diameter.

Vent Pipe Length Tables

Maximum Allowable Vent Lengths

Tables providing maximum allowable intake or exhaust vent lengths based on configuration.

Vent Pipe Length Tables (Continued)

Maximum Allowable Vent Lengths

Continues tables for maximum allowable intake or exhaust vent lengths.

Vent Pipe Length Tables (Continued)

Maximum Allowable Exhaust Vent Pipe Length

Table for maximum vent pipe lengths without insulation in unconditioned spaces.

Vent Pipe Connection Diagrams

Vent Pipe Connection Diagrams

Illustrates typical exhaust and intake pipe connections for various applications.

Intake Piping Installation

Intake Piping Installation

Provides instructions for installing intake piping for direct and non-direct vent systems.

Vent Termination Guidelines

General Guidelines for Vent Terminations

Offers general advice for terminating vent pipes, considering environmental factors.

Vent Pipe Length Tables (Continued)

Maximum Allowable Exhaust Vent Pipe Length

Table for maximum vent pipe lengths without insulation in unconditioned spaces.

Vent Termination Clearances

Vent Termination Clearances

Specifies clearances for vent terminals in non-direct vent installations.

Vent Termination Clearances (Continued)

Vent Termination Clearances

Specifies clearances for vent terminals in direct vent installations.

Direct Vent Piping Details

Direct Vent Piping Details

Details intake and exhaust piping terminations for direct vent installations.

Exhaust Pipe Sizing

Exhaust Pipe Termination Size Reduction

Provides guidance on exhaust pipe termination size reductions.

Field Fabricated Vent Terminations

Field Fabricated Vent Terminations

Instructions for field-fabricated wall and alternate vent terminations.

Non-Direct Vent Piping Installation

Non-Direct Vent Piping Details

Covers exhaust piping terminations for non-direct vent applications.

Condensate Piping and Drainage

Condensate Piping and Drainage

Details condensate trap locations and piping requirements.

Condensate Management Options

Condensate Management Options

Explains options for managing condensate from furnace and evaporator coils.

Condensate Management Options (Continued)

Condensate Management Options

Explains options for managing condensate from furnace and evaporator coils.

Condensate Drain Assembly Diagrams

Condensate Drain Assembly Diagrams

Illustrates assemblies for condensate drain piping using PVC.

Gas Piping and Leak Detection

Gas Piping and Leak Detection

Covers gas piping installation, safety warnings, and leak testing procedures.

Gas Piping Configurations

Gas Piping Configurations

Shows common gas piping configurations for upflow and horizontal applications.

Gas Pipe Capacity Table

Gas Pipe Capacity

Table detailing gas pipe capacity based on size and length.

Electrical Connections and Safety

Electrical Connections and Safety

Guidelines for safe electrical connections, grounding, and ESD precautions.

Electrical System and Controls

Electrical System and Controls

Information on generator requirements, wiring, and thermostat selection.

Furnace Features and Airflow Adjustments

Furnace Features and Operation

Describes humidifier, EAC, variable speed, dehumidification, and airflow adjustments.

Blower Performance Data

Blower Performance Data

Tables showing blower performance for different models and settings.

Blower Performance Data (Continued)

Blower Performance Data

Continues tables showing blower performance for different models and settings.

Blower Speed Adjustments

Blower Speed Adjustments

Details allowable heating and circulation speeds for the blower motor.

Wiring Diagrams

Wiring Diagrams

Provides schematic and connection diagrams for the furnace wiring.

Integrated Control and Troubleshooting

Integrated Control System

Explains the integrated control board, diagnostics, and troubleshooting.

Unit Start-Up and Operation

Unit Start-Up and Operation

Step-by-step guide for starting the furnace and operating the gas valve.

Priming Condensate Trap

Instructions for priming the condensate trap before unit operation.

System Operation and Adjustment

System Operation and Adjustment

Covers heating sequence, failure checks, and gas pressure adjustments.

Combustion and Altitude Adjustments

Proper Combustion

Details procedures for checking and ensuring proper combustion analysis.

High Altitude Information

Provides guidance for installing and operating the furnace at high altitudes.

Maintenance and System Testing

Maintenance and Testing

Lists annual maintenance tasks and general system testing procedures.

Unit Adjustments and Operation Modes

Unit Adjustments and Operation Modes

Covers adjustments for limits, switches, and operation modes like Fan On and Cooling.

Service and Annual Maintenance

Service

General warnings and precautions regarding furnace servicing.

Annual Furnace Maintenance

Detailed checklist for annual furnace inspection and maintenance.

Seasonal Maintenance and Cleaning

Seasonal Maintenance and Cleaning

Procedures for winterizing, condensate trap care, and cleaning the burner assembly.

Regional Installation Requirements

Requirements for Commonwealth of Massachusetts

Specific Massachusetts code requirements for venting and CO detectors.

Regional Venting Applications

Regional Venting Applications

Venting requirements specific to Ontario and Saskatchewan, Canada.

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