Lennox ML196UH030XE36B

Page 1
© 2020 Lennox Industries Inc.
Litho U.S.A.
Corp 1911-L7
07/2020
ML196UHE
Service Literature
ML196UHE SERIES UNITS
ML196UHE series units are high-efficiency gas fur
naces manufactured with Lennox DuralokPlust alumi
nized steel clamshell-type heat exchangers, with a stainless
steel condensing coil. ML196UHE units are available in
heating input capacities of 30,000 to 135,000 Btuh and
cooling applications from 1.5 through 5 tons. Refer to Engi
neering Handbook for proper sizing.
Units are factory equipped for use with natural gas. A kit is
available for conversion to LP/Propane operation. All
ML196UHE units are equipped with a hot surface ignition
system. The gas valve is redundant to assure safety
shut-off as required by C.S.A.
The heat exchanger, burners and manifold assembly can be
removed for inspection and service. The maintenance section
gives a detailed description on how this is done.
All specifications are subject to change. Procedures outlined
in this manual are presented as a recommendation only
and do not supersede or replace local or state codes.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon
nect switch(es). Unit may have multiple
power supplies.
Table of Contents
Specifications 2.................................
Optional Accessories 3..........................
Blower Performance Data 4......................
I-Unit Components 7............................
II Placement and Installation 21....................
III-Start-Up 42...................................
IV-Heating System Service Checks 43..............
V-Typical Operating Conditions 47.................
VI-Maintenance 48...............................
VII-Sequence of Operation and Flow Charts 51......
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person
al injury or loss of life. Installation and service must
be performed by a licensed professional HVAC in
staller (or equivalent), service agency or the gas sup
plier.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in
jury. Take care while handling this equipment and
wear gloves and protective clothing.

Lennox ML196UH030XE36B Specifications

General

Brand	Lennox
Model	ML196UH030XE36B
Category	Furnace
Language	English

Summary

ML196 UHE SERIES UNITS

Unit Overview

General description of ML196UHE series high-efficiency gas furnaces.

SPECIFICATIONS

Gas Heating Performance

Detailed specifications for gas heating performance of ML196UHE units.

Electrical Data

Electrical specifications including voltage and amperage for ML196UHE units.

OPTIONAL ACCESSORIES

Termination Kits

List of termination kits available for ML196UHE unit installations.

BLOWER DATA

ML196 UHE PARTS IDENTIFICATION

Control Box Identification

Diagram and labels for the ML196UHE furnace control box components.

I-UNIT COMPONENTS

Electrostatic Discharge (ESD) Precautions

Procedures and precautions for handling electronic components safely.

Control Box Components

Detailed description of components within the furnace control box.

INTEGRATED CONTROL (Automatic Hot Surface Ignition System)

Electronic Ignition

Explanation of the furnace's electronic ignition system and sequence.

B-Heating Components

Heat Exchanger

Description of the primary and secondary heat exchanger assembly.

Primary Limit Control

Location and function of the primary limit control switch.

Gas Valve, Flame Sensor, and Ignitor

Gas Valve

Details on the ML196UHE furnace gas valve operation and testing.

Flame Sensor

Information on the flame sensor's location, function, and measurement.

Combustion Air Pressure Switch

Blower Compartment and Secondary Limit Controls

Secondary Limit Controls

Description of the secondary limit control in the blower compartment.

II-PLACEMENT AND INSTALLATION

Pipe & Fittings Specifications

Specifications for approved piping and fitting materials for ML196UHE.

Venting Practices

Vent Piping Guidelines

Intake Piping

General Guidelines for Vent Terminations

VENT TERMINATION CLEARANCES FOR NON-DIRECT VENT INSTALLATIONS

VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS

Intake and Exhaust Piping Terminations (Direct Vent)

Condensate Piping

Condensate Trap and Plug Locations

TRAP DRAIN ASSEMBLY

III-START-UP

Heating Start-Up

Procedure for starting the furnace for heating operation.

IV-HEATING SYSTEM SERVICE CHECKS

Testing Gas Supply Pressure

Procedure for testing gas supply pressure to the furnace.

MANIFOLD PRESSURE CHECK SETUP

Proper Combustion

Guidelines for achieving proper combustion through pressure and flow.

G- Proper Ground and Voltage

V-TYPICAL OPERATING CHARACTERISTICS

Blower Operation and Adjustment

How to operate and adjust the furnace blower.

External Static Pressure

Procedure for measuring and adjusting external static pressure.

VI-MAINTENANCE

Filter Maintenance

Guidelines for inspecting, cleaning, or replacing air filters.

Electrical Checks

Procedure for checking furnace wiring and voltage.

Cleaning Heat Exchanger

VII-WIRING DIAGRAM AND SEQUENCE OF OPERATION

Sequence of Operation

Step-by-step description of the furnace's heating sequence.

Troubleshooting: Heating Sequence of Operation

Troubleshooting: Cooling Sequence of Operation

Troubleshooting: Continuous Fan Accessories Sequence of Operation