Lennox EL296UH090XV48C 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 EL296UH090XV48C Specifications

General

Brand	Lennox
Model	EL296UH090XV48C
Category	Furnace
Language	English

Summary

SPECIFICATIONS

BLOWER DATA

Heating Performance

Heating blower speed data based on DIP switch settings.

Cooling Performance

Cooling blower speed data based on DIP switch settings.

Blower Motor Watts (Cooling)

Motor power consumption data for cooling modes.

I-UNIT COMPONENTS

ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures

Safety guidelines for handling electronic components to prevent ESD damage.

Integrated Control

Description of the SureLight® two-stage integrated control system.

INTEGRATED CONTROL CONFIGURATION GUIDE

THERMOSTAT SELECTION

How to select thermostat type (single/two-stage) and heat stages.

HEATING MODE BLOWER SPEED

DIP switch settings for controlling heating blower speeds.

COOLING MODE BLOWER SPEED

DIP switch settings for controlling cooling blower speeds.

Integrated Control DIP Switch Settings

Heating Operation DIP Switch Settings

Settings for thermostat selection and heating stage control.

Indoor Blower Operation DIP Switch Settings

DIP switch settings for cooling mode blower speeds.

Cooling Blower Speed Adjustment

Adjustments for cooling blower speed (+/- 10%).

Heating Mode Blower Speed

DIP switch settings for adjusting heating blower speeds.

On Board Links

OPERATING SEQUENCE Non-Communicating Thermostat with Humidity Control Feature and Single-Speed Outdoor Unit

Sequence of operation for non-communicating thermostats with humidity control.

B- Indoor Blower Motor

Blower Drive

Details on the blower drive unit, including LED codes and troubleshooting.

Troubleshooting Motor Operation

Steps to verify motor operation and test procedures.

Troubleshooting Motor Windings

TEST A

TEST B

C- Heating Components

1. Ignitor

2. Flame Sensor

4. Flame Rollout Switches (S47)

6. Primary Limit Control (S10)

Combustion Air Inducer Pressure Switch (S18)

Function and location of the dual-stage pressure switch for the inducer.

Pressure Switch Check

Procedure to check pressure switch differential and set points.

Ignitor Check

Test 1

Test 2

Test 3

II-PLACEMENT AND INSTALLATION

PIPING AND FITTINGS SPECIFICATIONS

Joint Cementing Procedure

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

Condensate Piping

Condensate Trap Locations

Furnace With Evaporator Coil Using A Separate Drain

Furnace with Evaporator Coil Using a Common Drain

III-START-UP

A-Preliminary and Seasonal Checks

B-Heating Start-Up

Procedures for safely starting the furnace for heating operation.

Priming Condensate Trap

Gas Valve Operation (FIGURE 53)

Instructions for safely operating the gas valve.

Failure To Operate

Troubleshooting steps if the unit fails to operate.

IV-HEATING SYSTEM SERVICE CHECKS

B-Gas Piping

C-Testing Gas Piping

D-Testing Gas Supply Pressure

Procedure for testing gas supply pressure at the inlet post.

E-Check Manifold Pressure

Procedure for measuring manifold pressure and comparing to specifications.

F- Proper Gas Flow (Approximate)

G- Proper Combustion

Checking combustion parameters like CO2 and CO levels for efficiency.

I- Proper Ground and Voltage

Check Voltage Between Line Neutral and Low Voltage "C" Terminal

Check Voltage Between Line Hot and Line Neutral

V-TYPICAL OPERATING CHARACTERISTICS

A-Blower Operation and Adjustment

B-Temperature Rise

Factors affecting temperature rise and blower speed settings.

C-External Static Pressure

Procedure for measuring and adjusting external static pressure.

VI-MAINTENANCE

Blower

Filters

IMPORTANT

Winterizing and Condensate Trap Care

Cleaning Heat Exchanger

Step-by-step procedure for cleaning the heat exchanger.

Cleaning the Burner Assembly (if needed)

Procedure for cleaning the burner assembly and checking for blockages.

VII- Wiring and Sequence of Operation

Ignition Control 107045-01

Wiring diagram for ignition control model 107045-01.

Ignition Control 107045-01 and Blower Drive

Wiring diagram for ignition control 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)

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

Optional Accessories for use with any Communicating System

Optional accessories compatible with communicating systems.

Optional Accessories With Communicating System

Optional accessories compatible with communicating systems.

Ignition Control 103130-05 DIP Switch Settings and On Board Links

DIP switch and link settings for various thermostat and system configurations.

Ignition Control 107045-01 DIP Switch Settings and On Board Links

DIP switch and link settings for various thermostat and system configurations.

Ignition Control 107045-01 DIP Switch Settings and On Board Links

1 Heat / 1 Cool

1 Heat / 2 Cool

1 Heat / 2 Cool with t'stat with humidity control

2 Heat / 2 Cool

2 Heat / 2 Cool with t'stat with humidity control

2 Heat / 1 Cool with t'stat with humidity control

2 Heat / 1 Cool

Dual Fuel Single Stage Heat Pump

DIP switch and link settings for dual fuel single stage heat pump.

Dual Fuel Two Stage Heat Pump

DIP switch and link settings for dual fuel two stage heat pump.

IX- Program Unit Capacity Size Modes

X- Troubleshooting

Troubleshooting: Heating Sequence of Operation

Flowchart detailing the heating sequence and potential issues.

Troubleshooting: Heating Sequence of Operation Continued

Final part of the heating sequence troubleshooting flowchart.

Troubleshooting: Cooling Sequence of Operation

Flowchart detailing the cooling sequence and potential issues.

Troubleshooting: Continuous Fan Operation

Flowchart for troubleshooting continuous fan operation.