Lennox ML196UH110XE60C

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 ML196UH110XE60C Specifications

General

Model	ML196UH110XE60C
Type	Gas Furnace
Efficiency Rating	High Efficiency
Heating Capacity	110, 000 BTU
Warranty	Limited Lifetime Heat Exchanger Warranty, 5-Year Limited Warranty on covered components
Fuel Type	Natural Gas
AFUE	96%
Motor Type	ECM
Stages	Single Stage

Summary

Safety Information

Installation Locations

Use of Furnace as Construction Heater

Combustion, Dilution & Ventilation Air

Installation - Setting Equipment

Installation Clearances

Return Air Guidelines

Horizontal Application Installation Clearances

Suspended Installation of Horizontal Unit

Pipe & Fittings Specifications

Joint Cementing Procedure

Venting Practices

Vent Piping Guidelines

Piping Size Process

Intake Piping

General Guidelines for Vent Terminations

VENT TERMINATION CLEARANCES FOR NON-DIRECT VENT INSTALLATIONS IN THE US AND CANADA

VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE US AND CANADA

Details of Intake and Exhaust Piping Terminations for Direct Vent Installations

Details of Exhaust Piping Terminations for Non-Direct Vent Applications

Condensate Piping

Gas Piping

Leak Check

Procedure for checking gas connections for leaks after installation.

Electrical

ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures

IGNITION CONTROL

Indoor Blower Speeds

INTEGRATED CONTROL

Unit Start-Up

Priming Condensate Trap

Gas Valve Operation

Failure To Operate

Heating Sequence Of Operation

Unit Start-Up Procedures

Gas Flow (Approximate)

Supply Pressure Measurement

How to check and adjust the gas supply line pressure.

Check Manifold Pressure

How to check and verify manifold pressure for proper regulator adjustment.

Proper Combustion

Steps to ensure correct combustion air and gas mixture for efficient operation.

Testing for Proper Venting and Sufficient Combustion Air for Non-Direct Vent Applications

Other Unit Adjustments

Temperature Rise

How to check and adjust temperature rise for optimal performance.

Blower Speeds

Electronic Ignition

Exhaust and Air Intake Pipe

Service

Annual Furnace Maintenance

Checklist for routine maintenance tasks to ensure system performance.

Cleaning the Burner Assembly

Start-Up & Performance Check List

GAS SUPPLY

Checklist items for verifying gas supply connections and pressure.

INTAKE EXHAUST PIPE

Checklist items for verifying intake and exhaust pipe installation.

DUCT SYSTEM

Checklist items for verifying supply and return duct installation.

VOLTAGE CHECK

Checklist item for verifying electrical supply voltage.

UNIT OPERATION

HEATING MODE

Parameters to check during heating mode operation.

COOLING MODE

Parameters to check during cooling mode operation.

Blower Data

Blower Data Continuation

Blower Data Continuation 2