Lennox ML180UH SERIES

ML180UH
SERIES
Litho U.S.A.
506525-01
01/2015
Supersedes 10/2012
E 2015 Lennox Industries Inc.
Dallas, Texas, USA
WHAT TO DO IF YOU SMELL GAS:
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other ap
pliance.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
D Do not try to light any appliance.
D Do not touch any electrical switch; do not
use any phone in your building.
D Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
D If you cannot reach your gas supplier, call
the fire department.
D Leave the building immediately.
GAS FURNACE
FIRE OR EXPLOSION HAZARD.
Failure to follow safety warnings exact
ly could result in serious injury, death,
or property damage.
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 installer (or
equivalent), a service agency, or the gas supplier.
WARNING

Lennox ML180UH SERIES Specifications

General

Efficiency	80% AFUE
Heating Stages	Single-stage
Blower Motor	PSC
Gas Valve	Single-stage
Ignition System	Hot Surface Ignition
Fuel Type	Natural gas or propane
Configuration	Upflow/Horizontal
Ignition Type	Hot Surface Ignition
Heat Exchanger Material	Aluminized steel
Heating Capacity	44, 000 to 132, 000 BTUH
Warranty	20-year limited warranty on heat exchanger, 5-year limited warranty on parts

Summary

Users Information Manual

ML180 UH Series

Identifies the specific model series covered by the manual.

Gas Furnace

Specifies the type of appliance detailed in the manual.

General Safety Warnings

Covers critical warnings about installation, fire, and explosion hazards.

ML180 UH Parts Identification

Safety Instructions and Hazards

General Safety Guidelines

Lists essential safety precautions for furnace operation and environment.

Asphyxiation and Carbon Monoxide Hazards

Details risks of asphyxiation and CO exposure, recommending detectors.

Explosion Danger and LP Gas

Warns about LP gas leak risks and advises using leak detectors.

Start-Up & Operation Information

Starting and Operating the Gas Valve

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

Turning Off Gas to the Unit

Procedure for safely shutting off the gas supply to the furnace.

Filter Maintenance and Replacement

Information on filter inspection, cleaning, and replacement.

Scheduled Maintenance Procedures

Outlines recommended annual maintenance tasks by a professional.

Service and Checks

Electrical System Checks

Instructions for checking wiring, voltage, and motor amperage.

Blower Assembly Inspection

Guidance on inspecting and cleaning the blower wheel and motor.

Service Reminders and Troubleshooting

Provides pre-call checks and troubleshooting advice for service issues.

Safety Precautions and Furnace Maintenance

Identifying Furnace Malfunctions

Lists signs and symptoms of potential furnace problems and hazards.

Flood-Damaged Furnace Warning

Critical warning against using furnaces exposed to water due to extreme danger.

Annual Furnace Maintenance Checklist

Details required annual service checks by a licensed technician.

Repair Parts List and System Testing

General System Test Procedures

Steps for testing ignition, airflow, and gas pressure settings.

Available Repair Parts

Lists common replacement parts available through dealers.