Lennox ML196UH070XE48B - User Manual

Page 1
INSTALLATION
INSTRUCTIONS
ML196UHE
507966-04
04/2021
Supersedes 507966-03
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.
© 2021 Lennox Industries Inc.
Dallas, Texas USA
MERIT
®
SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
Contents
Unit Dimensions - inches (mm) ......................................2
ML196UHE .....................................................................3
Shipping and Packing List ..............................................3
Safety .............................................................................3
Use of Furnace as a Construction Heaterl .....................4
General ...........................................................................5
Combustion, Dilution, Ventilation Air...............................5
Setting Equipment ..........................................................8
Filters ............................................................................13
Duct System .................................................................13
Pipe Fittings Specications...........................................13
Joint Cementing Procedure .......................................... 16
Venting Practices ..........................................................16
Gas Piping ....................................................................36
Electrical .......................................................................39
Unit Start-Up .................................................................42
Gas Pressure Measurement.........................................44
Proper Combustion.......................................................44
High Altitude .................................................................44
Testing Combustion Air For Non-Dierct Vent ................ 46
Other Unit Adjustments.................................................46
Service..........................................................................48
Repair Parts List ...........................................................49
Start-Up Checklist.........................................................51
Blower Data ..................................................................53

Lennox ML196UH070XE48B Specifications

General

Model	ML196UH070XE48B
Efficiency Rating	96% AFUE
Blower Type	Variable Speed
Weight	121 lbs
Stages	Single Stage
Fuel Type	Natural Gas
AFUE	96%
Type	Gas Furnace
Voltage	115V
Dimensions (H x W x D)	17.5 in W x 28 in

Summary

Safety Information

Warning and Caution Statements

General safety warnings and precautions for installation and handling of equipment.

Installation Locations

Combustion, Dilution & Ventilation Air

Installation - Setting Equipment

Installation Clearances

Horizontal Applications

Pipe & Fittings Specifications

Joint Cementing Procedure

Venting Practices

Piping Size Process

General Guidelines for Vent Terminations

Vent Termination Clearances

Intake and Exhaust Piping Terminations for Direct Vent

Exhaust Piping Terminations for Non-Direct Vent

Condensate Piping

Gas Piping

Electrical

Electrostatic Discharge (ESD) Precautions

Procedures to prevent damage to electronic components from static discharge.

Ignition Control

Indoor Blower Speeds

How to select and set the fan speeds for the indoor blower motor.

Unit Start-Up

Priming Condensate Trap

Steps to ensure the condensate trap is filled with water for proper drainage.

Gas Valve Operation

Instructions for safely operating the furnace's gas valve.

Heating Sequence Of Operation

Description of the steps the furnace follows when calling for heat.

Gas Flow (Approximate)

Supply Pressure Measurement

Proper Combustion

Testing for Proper Venting and Combustion Air

Other Unit Adjustments

Temperature Rise

Fan Control

Blower Speeds

Electronic Ignition

Service

Cleaning the Burner Assembly

Start-Up & Performance Check List

Unit Operation

Heating Mode

Cooling Mode

Blower Data