Lennox ML180UH110E60C

Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
©2016 Lennox Industries, Inc.
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be properly grounded
in accordance with national and local
codes.
Line voltage is present at all components
when unit is not in operation on units
with single-pole contactors. Disconnect
all remote electric power supplies before
opening access panel. Unit may have
multiple power supplies.
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.
ML180UHE(X) series units are mid-e󰀩ciency gas furnac-
es used for upow or horizontal applications only, man-
ufactured with Lennox Duralok heat exchangers formed
of aluminized steel. ML180UHE(X) units are available in
heating capacities of 44,000 to 132,000 Btuh and cooling
applications 2 to 5 tons. Refer to Engineering Handbook
for proper sizing.
Units are factory equipped for use with natural gas. Kits
are available for conversion to LP/Propane operation.
ML180UHE(X) model units are equipped with a hot sur-
face ignition system. The ML180UHE(X) unit meets the
California Nitrogen Oxides (NOx) Standards and Califor-
nia Seasonal E󰀩ciency requirements.
All units use a redundant gas valve to assure safety shut-
o󰀨 as required by C.S.A. All specications in this manual
are subject to change. Procedures outlined in this manual
are presented as a recommendation only and do not su-
persede or replace local or state codes. In the absence
of local or state codes, the guidelines and procedures
outlined in this manual (except where noted) are recom-
mended only and do not constitute code.
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.
TABLE OF CONTENTS
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Blower Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
Parts Identication . . . . . . . . . . . . . . . . . . . . . . . . . Page 6
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . . Page 7
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
IV Heating System Service Checks . . . . . . . . . Page 21
V Typical Operating Characteristics . . . . . . . . . Page 26
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26
VII Wiring and Sequence of Operation . . . . . . Page 29
ML180UHE(X)
Corp 1120-L4
Revised 10-2017
ML180UHE(X) SERIES UNITS

Lennox ML180UH110E60C Specifications

General

Brand	Lennox
Model	ML180UH110E60C
Category	Furnace
Language	English

Summary

ML180 UHE(X) SERIES UNITS

SPECIFICATIONS AND PERFORMANCE DATA

Model Specifications

Detailed performance metrics for ML180UHE(X) units including AFUE, input/output, and pressure.

Optional Accessories

Lists optional accessories available for ordering, categorized by type.

Blower Performance Data

Provides air volume and wattage data for various blower speeds at different static pressures.

Parts Arrangement Diagram

Illustrates the layout of major unit components within the furnace.

Unit Components Overview

Describes key internal components like transformer, control board, and switches.

HEATING SYSTEM COMPONENTS AND OPERATION

Heating Components Description

Details flame rollout switches, primary limit control, and the flame sensor.

Ignition, Gas Valve, and Inducer

Explains the operation of the gas valve, combustion air inducer, and ignitor.

Ignitor Performance Checks

Procedures for testing ignitor resistance and voltage for proper function.

Pressure Switch and Blower Motor

Details the pressure switch function and blower motor troubleshooting.

Motor Module Replacement Guide

Steps for testing and replacing the motor control module.

INSTALLATION AND START-UP GUIDELINES

Unit Placement and Installation Requirements

General requirements for unit placement and installation according to codes.

Start-Up, Shutdown, and Safety Procedures

Steps for starting the furnace, emergency shutdown, and extended periods.

SERVICE, MAINTENANCE, AND CHECKS

Heating System Service Checks

Covers CSA certification, gas piping, pressure adjustment, combustion, and high altitude.

Ground and Voltage Verification

Procedures to check for proper ground and voltage to the integrated control.

Routine Maintenance Procedures

Covers general checks, cleaning, system integrity, and performance testing.

OPERATING CHARACTERISTICS AND SEQUENCES

Typical Operating Characteristics

Explains blower operation, temperature rise, and external static pressure.

Wiring Diagrams and Sequence of Operations

Provides wiring diagrams and operational sequences for heating, cooling, and fan modes.