Lennox ELITE EL297UH070XV36B - User Manual

Page 1
INSTALLATION
INSTRUCTIONS
EL297UHV
508358-01
05/2023
© 2023 Lennox Industries Inc.
Dallas, Texas USA
ELITE
®
SERIES GAS FURNACE
UP/FLOW HORIZONTAL AIR DISCHARGE
CAUTION
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
AIR FLOW
UPFLOW
AIR FLOW
AIR FLOW
HORIZONTAL RIGHT
HORIZONTAL LEFT
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
This is a safety alert symbol and should never be
ignored. When you see this symbol on labels or in man-
uals, be alert to the potential for personal injury or death.
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.
NOTICE
A thermostat is not included and must be ordered
separately.
A communicating thermostat must be used in
communicating applications.
In non-communicating applications, the Lennox
ComfortSense® 7500 thermostat may be used, as well
as other non-communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
Field wiring for both communicating and non-
communicating applications is illustrated in diagrams,
which begin on Page 41.
Table of Contents
Unit Dimensions - inches (mm) .....................................2
Shipping and Packing List ..............................................3
Safety Information ..........................................................3
Use of Furnace as Construction Heater .........................4
General ...........................................................................5
Shipping Bolt Removal ...................................................8
Installation - Setting Equipment ......................................8
Filters ............................................................................13
Duct System .................................................................13
 .......................................14
Joint Cementing Procedure .......................................... 15
Venting Practices ..........................................................16
Gas Piping ....................................................................36
Electrical .......................................................................39
Integrated Control .........................................................51
Conventional Thermostat (non-communicating) ...........52
Blower Data ..................................................................54
On-Board Links.............................................................58
Unit Start Up .................................................................60
Gas Pressure Adjustment .............................................61
Proper Combustion.......................................................62
High Altitude .................................................................62
Combustion Air for Non-Direct Vent Applications .........62
Repair Parts..................................................................63
Other Unit Adjustments.................................................64
Heating Sequence of Operation ...................................63
Service..........................................................................66
Program Unit Capacity/Size Mode ...............................68
Requirements for Commonwealth of Massachusetts ... 69

Lennox ELITE EL297UH070XV36B Specifications

General

Model	EL297UH070XV36B
Type	Gas Furnace
Efficiency Rating	97% AFUE
Heating Capacity	70, 000 BTU
Blower Motor	Variable Speed
Stages	Two-Stage
Warranty	10-Year Limited Warranty

Summary

Furnace Installation and Setup

Unit Dimensions

Physical dimensions of the furnace unit in inches and millimeters.

Safety Information

Critical warnings and precautions for safe handling and installation.

Installation Locations

Guidelines on acceptable installation locations and restrictions.

Setting Equipment

Proper placement and leveling of the furnace unit.

Installation Clearances

Required clearances to combustible materials and service access.

System Connections and Venting

Combustion, Dilution & Ventilation Air

Requirements for providing adequate combustion and ventilation air.

Duct System

Guidelines for sizing and installing supply and return air ducts.

Pipe & Fittings Specifications

Approved materials and standards for pipe and fittings.

Condensate Piping

Instructions for routing and installing the condensate drain line.

Gas Piping

Instructions and safety precautions for gas supply connections.

Electrical

Guidance on electrical connections, wiring, and safety.

Venting Practices and Terminations

Guidelines for routing, terminating, and clearing vent pipes.

Controls, Operation, and Maintenance

Thermostat Selection

Guidance on selecting and wiring thermostats, including communicating systems.

DIP Switch Settings

Settings for heating/cooling stages, blower speeds, and delays.

Blower Data

Tables detailing blower performance at various settings.

Unit Start Up

Steps for safely starting the furnace for the first time.

Service

Procedures for maintenance, inspection, and troubleshooting.

Program Unit Capacity;Size Mode

Setting the furnace model and capacity code for proper function.

Requirements for Commonwealth of Massachusetts

Specific local code modifications for CO detectors and signage.