Lennox EL296UH110XV48C 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 EL296UH110XV48C Specifications

General

Model	EL296UH110XV48C
Efficiency Rating	96% AFUE
Heating Capacity	110, 000 BTU/h
Blower Type	Variable Speed
Ignition Type	Hot Surface Ignition
Fuel Type	Natural Gas
Heat Exchanger Material	Stainless Steel
Warranty	Limited Lifetime Heat Exchanger, 5-Year Parts
Stages	Two-Stage
Voltage	115V
Cabinet Construction	Heavy-Gauge Steel

Summary

COMMUNICATING - ENABLED EL296UHV(X) SERIES UNITS

SPECIFICATIONS

BLOWER DATA

BLOWER PERFORMANCE

Provides cfm data for heating and cooling based on DIP switch settings.

BLOWER MOTOR WATTS (COOLING)

Details motor wattage consumption at various external static pressures.

PARTS IDENTIFICATION

I-UNIT COMPONENTS

A- Control Box

5. Integrated Control (A92)

Describes the SureLight integrated control and its functions for ignition and blower.

INTEGRATED CONTROL 103130-05

IGNITION CONTROL 107045-01

THERMOSTAT CONNECTIONS (TB1)

Wiring specifications for connecting thermostats to the ignition control.

Diagnostic Modes

Diagnostic LED

Explanation of the seven-segment diagnostic LED for status and error codes.

Diagnostic Push Button

Instructions for using the push button to access diagnostic menus.

Error Code Recall Mode

Procedure for accessing and clearing recent error codes.

Flame Signal Mode

Procedure for accessing flame signal mode and checking flame current.

Program Unit Capacity/Size Mode

Steps to configure furnace model and capacity settings.

B- Indoor Blower Motor

Blower Drive -045

Details on the blower drive, LED codes, and replacement procedures.

Troubleshooting Motor Windings

TEST A

Procedure to measure winding resistance to ground.

TEST B

Procedure to measure phase-to-phase resistance for motor winding checks.

C- Heating Components

1. Ignitor

Information on the SureLight ignitor, its voltage, and ohm value.

2. Flame Sensor

Location and function of the flame sensor for monitoring burner operation.

3. Gas Valve

Details on the gas valve, its terminals, and pressure taps.

4. Flame Rollout Switches (S47)

6. Primary Limit Control (S10)

Ignitor Check

Test 1

Procedure to check ignitor circuit resistance across terminals.

Test 2

Procedure to check ignitor resistance at the plug.

Test 3

Procedure to check ignitor voltage during its warm-up period.

7. Combustion Air Inducer (B6) and Cold End Header Box

8. Combustion Air Inducer Pressure Switch (S18)

Pressure Switch Check

Piping Size Process

TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS

TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON-DIRECT VENT APPLICATIONS (RIGHT HAND DISCHARGE SHOWN)

Intake Piping

VENT TERMINATION CLEARANCES FOR NON-DIRECT VENT INSTALLATIONS IN THE US AND CANADA

VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE US AND CANADA

III-START-UP

A-Preliminary and Seasonal Checks

B-Heating Start-Up

Procedures for starting the furnace in heating mode, including gas valve operation.

Gas Valve Operation (FIGURE 53)

Steps for safely operating the gas valve and furnace ignition.

Turning Off Gas to Unit

Procedure for safely turning off gas supply to the furnace.

Failure To Operate

Troubleshooting steps for common unit operation failures.

IV-HEATING SYSTEM SERVICE CHECKS

B-Gas Piping

C-Testing Gas Piping

D-Testing Gas Supply Pressure

E-Check Manifold Pressure

F- Proper Gas Flow (Approximate)

I- Proper Ground and Voltage

Cleaning the Burner Assembly (if needed)

VII- Wiring and Sequence of Operation

EL296 Schematic Diagram

Detailed wiring diagram for the EL296 furnace unit.

Ignition Control 107045-01

Electronic Ignition

Applications Using a Two-Stage Thermostat

Applications Using A Single-Stage Thermostat See FIGURE 60 for ignition control sequence

B - Heating Sequence -- Integrated Control Thermostat Selection DIP Switch 1 ON in “Single-Stage” Position

X- Troubleshooting

Troubleshooting: Heating Sequence of Operation

Flowchart detailing the heating sequence and common operational issues.

CALL FOR FIRST-STAGE HEAT

Troubleshooting: Heating Sequence of Operation Continued

Continuation of heating sequence troubleshooting, focusing on second-stage operation.

CALL FOR SECOND-STAGE HEAT

Troubleshooting: Cooling Sequence of Operation

Flowchart detailing the cooling sequence and troubleshooting steps.

CALL FOR COOLING

Troubleshooting: Continuous Fan Operation

CALL FOR FAN