Lennox EL296UH090XV36C User Manual

Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
©2016 Lennox Industries, Inc.
EL296UHV(X)
Corp 1125-L5
Revised 03/2022
COMMUNICATING - ENABLED EL296UHV(X) SERIES UNITS
EL296UHV(X) series units are 90% e󰀩ciency gas furnac-
es used for upow or horizontal applications only, man-
ufactured with Lennox Duralok heat exchangers formed
of aluminized steel. EL296UHV(X) units are available in
heating capacities of 44,000 to 132,000 Btuh and cooling
applications up to 5 tons. Refer to Product Specications
Manual for proper sizing.
Units are factory equipped for use with natural gas. Kits
are available for conversion to LPG operation. EL296UH-
V(X) model units are equipped with the icomfort
®
enabled
SureLight ® two-stage variable speed integrated control.
EL296UHV(X) unit meets the California Nitrogen Oxides
(NOx) Standards and California Seasonal E󰀩ciency re-
quirements. 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 supersede or replace lo-
cal or state codes. In the absence of local or state codes,
the guidelines and procedures outlined in this manual (ex-
cept where noted) are recommendations only and do not
constitute code.
TABLE OF CONTENTS
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Blower CFM Data . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . Page 27
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 58
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 81
IV Heating System Service Checks . . . . . . . . . Page 82
V Typical Operating Characteristics . . . . . . . . . Page 86
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 86
VII Wiring and Sequence of Operation . . . . . . Page 89
VIII Field Wiring and Jumper Settings . . . . . . . Page 95
IX Program Unit Capacity Size Mode . . . . . . . Page 109
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . Page 110
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.

Lennox EL296UH090XV36C Specifications

General

Model	EL296UH090XV36C
Type	Gas Furnace
Efficiency Rating	96% AFUE
Heating Capacity	90, 000 BTU
Blower Motor	Variable Speed
Vent Type	Direct Vent
Fuel Type	Natural Gas
Stages	2
Blower Motor Type	ECM
Stages of Heating	2-Stage
Warranty	10-Year Limited Warranty on parts, Limited Lifetime Warranty on Heat Exchanger

Summary

Blower Performance Data

Unit Components Identification

Control Box Components and Functions

Describes the control transformer, interlock switch, circuit breaker, and integrated control.

Integrated Control (A92) Features

Details the SureLight® two-stage, variable speed integrated control and its functions.

Integrated Control Configuration

Thermostat Wiring Connections (TB1)

Diagnostic Modes and Codes

Diagnostic LED and Push Button Functions

DIP Switch Settings for System Configuration

Heating and Cooling Blower Speed Settings

Indoor Blower Motor Troubleshooting

Motor Operation and Initial Power Up

Motor Windings Resistance Testing

Test A: Resistance to Ground Check

Test B: Phase-to-Phase Resistance Check

Heating System Components

Ignitor and Flame Sensor Checks

Details on ignitor ohm values, flame sensor operation, and testing procedures.

Gas Valve and Flame Rollout Switches

Ignitor Testing Procedures

Test 1: Ignitor Circuit Resistance

Checks ignitor circuit resistance across specific terminals.

Test 2 & 3: Ignitor Resistance and Voltage

Checks ignitor resistance at the plug and voltage during warm-up.

Combustion Air Inducer and Pressure Switch

Pressure Switch Function and Settings

Installation and Piping Requirements

Venting and Termination Guidelines

Venting Practices and Carbon Monoxide Hazard

Heating System Start-Up Procedures

Preliminary Checks and Heating Start-Up

Steps for initial checks, smelling for gas, and priming the condensate trap.

Gas Valve Operation and Failure to Operate

Instructions for operating the gas valve and troubleshooting common failure modes.

Heating System Service Checks

Gas Piping Testing and Supply Pressure

Proper Gas Flow and Combustion Checks

Methods for checking gas flow, proper combustion, and CO readings.

Ground and Voltage Checks

Proper Grounding for Furnace Operation

Typical Operating Characteristics and Maintenance

Blower Operation and Static Pressure

Seasonal Maintenance and Cleaning

Wiring Diagrams and Sequences

Ignition Control and Schematic Diagrams

Detailed wiring diagrams for ignition control and furnace schematic.

Heating and Cooling Sequences of Operation

Flowcharts illustrating heating and cooling operational sequences.

Field Wiring for Thermostats

Conventional Thermostat Wiring

Communicating Thermostat Wiring

DIP Switch and On-Board Link Settings

Thermostat Configuration Settings

Program Unit Capacity and Size Modes

Power-Up Unit Size Configuration

Procedure to enter and configure unit size code for proper operation.

Troubleshooting Heating Sequences

First-Stage Heating Sequence Flowchart

Flowchart detailing the sequence of operation for first-stage heating.

Second-Stage and Satisfied Heating Sequences

Flowcharts for second-stage heating and when the heating call is satisfied.