Lennox EL297UH135XV60D User Manual

Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
©2016 Lennox Industries, Inc.
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.
EL297UHV(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. EL297UHV(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. EL297UH-
V(X) model units are equipped with the icomfort
®
enabled
SureLight
®
two-stage variable speed integrated control.
EL297UHV(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 26
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 57
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 79
IV Heating System Service Checks . . . . . . . . . Page 80
V Typical Operating Characteristics . . . . . . . . . Page 83
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 83
VII Wiring and Sequence of Operation . . . . . . Page 86
Program Unit Capacity Size Mode . . . . . . . Page 110
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . Page 111
EL297UHV(X)
100088
Communicating-ENABLED EL297UHV SERIES UNITS

Lennox EL297UH135XV60D Specifications

General

Brand	Lennox
Model	EL297UH135XV60D
Category	Furnace
Language	English

Summary

SPECIFICATIONS

Gas Heating Performance

Details gas heating performance specifications for various models.

BLOWER DATA

Heating Speed DIP Switch Settings

Explains DIP switch settings for heating blower speeds.

Cooling Speed DIP Switch Settings

Details DIP switch settings for cooling blower speeds.

BLOWER MOTOR WATTS (COOLING)

Shows motor watts based on cooling speed and static pressure.

I-UNIT COMPONENTS

ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures

Explains ESD precautions for handling electronic components.

Ignition Control 107045-XX Diagnostic Modes

Diagnostic LED

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

Error Code Recall Mode

Details how to access and clear error codes.

Program Unit Capacity/Size Mode

Describes how to set the unit's capacity and size.

Integrated Control DIP Switch Settings and On Board Links

Heating Operation DIP Switch Settings

Explains DIP switch settings for heating operation.

Indoor Blower Operation DIP Switch Settings

Switches 11, 12 and 13 -- Heating Mode Blower Speed

B- Indoor Blower Motor

Blower Drive

Troubleshooting Motor Operation

Provides steps to troubleshoot motor operation issues.

Troubleshooting Motor Windings

Guides on testing motor windings for resistance.

C- Heating Components

Ignitor Check

Provides steps to check the ignitor for resistance and voltage.

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

8. Combustion Air Inducer Pressure Switch (S18)

Pressure Switch Check

Describes how to check pressure switch differential using a manometer.

II-PLACEMENT AND INSTALLATION

Venting Practices

Vent Piping Guidelines

Intake Piping

General Guidelines for Vent Terminations

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

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

Details of Intake and Exhaust Piping Terminations for Direct Vent Installations

FIELD FABRICATED WALL TERMINATION

Condensate Piping

III-START-UP

A-Preliminary and Seasonal Checks

B-Heating Start-Up

Details the procedure for starting the furnace in heating mode.

Failure To Operate

Lists common issues to check if the unit fails to operate.

IV-HEATING SYSTEM SERVICE CHECKS

B-Gas Piping

C-Testing Gas Piping

Details procedures for testing gas piping.

D-Testing Gas Supply Pressure

E-Check Manifold Pressure

F- Proper Gas Flow (Approximate)

G- Proper Combustion

Details proper combustion checks and CO2 readings.

I- Proper Ground and Voltage

V-TYPICAL OPERATING CHARACTERISTICS

A-Blower Operation and Adjustment

B-Temperature Rise (FIGURE 55)

C-External Static Pressure

VI-MAINTENANCE

Covers routine maintenance procedures for the unit.

Filters

Cleaning Heat Exchanger

Detailed procedure for cleaning the heat exchanger assembly.

Electronic Ignition

Applications Using a Two-Stage Thermostat

Applications Using A Single-Stage Thermostat See FIGURE 59 for ignition control sequence

VIII- FIELD WIRING WITH CONVENTIONAL AND COMMUNICATING ENABLED THERMOSTAT

Communicating Enabled Furnace and Non Communicating Outdoor Unit

Communicating Enabled Furnace and Communicating Enabled Outdoor Unit

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

Flowchart for heating sequence troubleshooting.

Troubleshooting: Cooling Sequence of Operation

Flowchart for cooling sequence troubleshooting.

Troubleshooting: Continuous Fan Operation

Flowchart for continuous fan operation troubleshooting.