Lennox EL296UH135XV60D 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 EL296UH135XV60D Specifications

General

Model	EL296UH135XV60D
Efficiency Rating	Up to 96% AFUE
Heating Capacity	135, 000 BTU/h
Blower Type	Variable Speed
Fuel Type	Natural Gas
Stages	Two-Stage
Warranty	Limited Lifetime Warranty on Heat Exchanger

Summary

COMMUNICATING - ENABLED EL296UHV(X) SERIES UNITS

SPECIFICATIONS

BLOWER DATA

HEATING

COOLING

BLOWER MOTOR WATTS (COOLING)

Motor wattage consumption for cooling based on static pressure and speed.

PARTS IDENTIFICATION

I-UNIT COMPONENTS

5. Integrated Control (A92)

Describes the SureLight integrated control system and its features.

Electronic Ignition

Explains how the electronic ignition system works.

INTEGRATED CONTROL CONFIGURATION GUIDE

THERMOSTAT CONNECTIONS (TB1)

Details the terminal connections for thermostats on the integrated control.

INTEGRATED CONTROL CONFIGURATION GUIDE (DIP Switch Settings)

THERMOSTAT SELECTION

Explains how to select thermostat modes (single/two-stage).

HEATING MODE BLOWER SPEED

Details DIP switch settings for controlling heating mode blower speed.

COOLING MODE BLOWER SPEED ADJUSTMENT

Explains how to adjust blower speed for cooling using DIP switches.

COOLING MODE BLOWER RAMPING

Integrated Control DIP Switch Settings Conventional Thermostat (non-communicating)

Heating Operation DIP Switch Settings

Indoor Blower Operation DIP Switch Settings

II-PLACEMENT AND INSTALLATION

PIPING AND FITTINGS SPECIFICATIONS

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)

Illustrates exhaust and intake pipe connections for horizontal installations.

III-START-UP

A-Preliminary and Seasonal Checks

Outlines preliminary and seasonal checks before operating the furnace.

B-Heating Start-Up

Details the step-by-step process for starting the furnace in heating mode.

Gas Valve Operation (FIGURE 53)

Details the operation of the gas valve, including safety precautions.

Failure To Operate

Lists common reasons for unit failure to operate and checks to perform.

IV-HEATING SYSTEM SERVICE CHECKS

B-Gas Piping

C-Testing Gas Piping

Details procedures for testing gas piping for leaks and pressure.

D-Testing Gas Supply Pressure

Explains how to test gas supply pressure using a manometer.

E-Check Manifold Pressure

Details how to check manifold pressure at the gas valve.

VI-MAINTENANCE

Blower

Cleaning Heat Exchanger

VII- Wiring and Sequence of Operation

Ignition Control 103130-05

EL296 Schematic Diagram

Provides the overall electrical schematic diagram for the EL296 unit.

Ignition Control 103130-05 and Blower Drive

Electronic Ignition

Applications Using a Two-Stage Thermostat

A - Heating Sequence - Integrated Control Thermostat Selection DIP Switch 1 OFF in “Two-Stage” Position (Factory Setting)

Explains the heating sequence when DIP switch 1 is set for two-stage thermostat operation.

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

Explains the heating sequence when DIP switch 1 is set for single-stage thermostat operation.

VIII- Field Wiring With Conventional and Communicating Enabled Thermostat

Communicating Enabled Furnace with a Non-Communicating Outdoor Unit

Communicating Enabled Furnace with a Communicating Enabled Outdoor Unit

IX- Program Unit Capacity Size Modes

X- Troubleshooting

Troubleshooting: Heating Sequence of Operation

Provides troubleshooting steps for the heating sequence of operation.

Troubleshooting: Heating Sequence of Operation Continued

Troubleshooting: Cooling Sequence of Operation

Troubleshooting: Continuous Fan Operation