Lennox EL296UH070XV36B 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 EL296UH070XV36B Specifications

General

Efficiency	96% AFUE
Stages of Heating	Two-Stage
Blower Motor	Variable Speed
Gas Valve	Modulating
Energy Star Certified	Yes
Heating Input BTUH	70, 000
Warranty	5 Years on Covered Components

Summary

UNIT INFORMATION

COMMUNICATING - ENABLED EL296UHV(X) SERIES UNITS

Overview of communicating enabled furnace series units, detailing efficiency and features.

I-UNIT COMPONENTS

5. Integrated Control (A92)

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

INTEGRATED CONTROL CONFIGURATION GUIDE

THERMOSTAT SELECTION

HEATING MODE BLOWER SPEED

COOLING MODE BLOWER SPEED ADJUSTMENT

Diagnostic LED

Diagnostic Push Button

Explains the function and operation of the diagnostic push button for accessing modes.

Error Code Recall Mode

Procedure for accessing and clearing stored error codes via the diagnostic menu.

Flame Signal Mode

Steps to access and view the flame signal current for troubleshooting ignition issues.

Diagnostic Codes

Code Description and Action

Lists diagnostic codes, their status, and required actions for clearing and recovery.

Internal Operation

Troubleshooting Motor Operation

Steps and procedures to verify motor operation and diagnose issues.

Troubleshooting Motor Windings

TEST A

Procedure to check motor winding resistance to ground for proper operation.

TEST B

Procedure to measure motor phase-to-phase resistance for identifying winding issues.

Ignitor Check

Test 1

Procedure to check ignitor circuit resistance across control terminals.

Test 2

Procedure to check ignitor resistance at the plug for wiring or ignitor faults.

Test 3

Procedure to check ignitor voltage during the warm-up period for proper operation.

III-START-UP

A-Preliminary and Seasonal Checks

B-Heating Start-Up

Procedures for initiating heating operation, including gas valve and burner checks.

Priming Condensate Trap

IV-HEATING SYSTEM SERVICE CHECKS

B-Gas Piping

D-Testing Gas Supply Pressure

Procedure for testing gas supply pressure at the unit's inlet post.

E-Check Manifold Pressure

Method for measuring and checking manifold pressure at the gas valve.

Proper Gas Flow (Approximate)

F- Proper Gas Flow (Approximate)

Method for determining proper gas flow by clocking the gas meter.

G- Proper Combustion

Guidelines for checking and ensuring proper combustion by measuring CO2 levels.

I- Proper Ground and Voltage

CHECK VOLTAGE BETWEEN LINE NEUTRAL AND LOW VOLTAGE “C” TERMINAL

Procedure to measure AC voltage between line neutral and the integrated control's 'C' terminal.

CHECK VOLTAGE BETWEEN LINE HOT AND LINE NEUTRAL

Procedure to measure AC voltage between line hot and line neutral on the integrated control.

VII- Wiring and Sequence of Operation

Ignition Control 103130-05 EL296 Schematic Diagram

Electrical schematic illustrating the wiring of the ignition control for the EL296 furnace.

Ignition Control 103130-05 and Blower Drive

EL296 Units With Blower Drive

Ignition Control 107045-01

Schematic Diagram

Electronic Ignition

Applications Using a Two-Stage Thermostat

Heating sequence for units using a two-stage thermostat with the integrated control.

Heating Sequence

Applications Using A Single-Stage Thermostat

Heating sequence for units using a single-stage thermostat with the integrated control.

VIII- Field Wiring With Conventional and Communicating Enabled Thermostat

Communicating Enabled Furnace with a Non-Communicating Outdoor Unit

Communicating Enabled Furnace and Communicating Enabled Outdoor Unit

IX- Program Unit Capacity Size Modes

Power-Up

Procedure for configuring the unit size code during power-up if not recognized.

X- Troubleshooting

Heating Sequence of Operation

Flowchart detailing the step-by-step process for heating operation and troubleshooting.

Troubleshooting: Cooling Sequence of Operation

CALL FOR COOLING

Initial step in the cooling sequence, starting with a call for cooling.

Troubleshooting: Continuous Fan Operation

CALL FOR FAN

Flowchart detailing the sequence for continuous fan operation.