LENNOX EL297DFV Elite Series Downflow Two Stage Heating Variable Speed Blower 60hz Owner’s Manual

: June 1, 2024
: Lennox

Table of Contents

EL297DFV Elite Series Downflow Two Stage Heating Variable Speed Blower
Product Specifications
Product Usage Instructions
Installation
Operation
Maintenance
- FAQ
Q: Can the EL297V furnaces be twinned?
Q: What is the maximum altitude for operation?
Q: What type of blower does the furnace have?

EL297DFV Elite Series Downflow Two Stage Heating Variable Speed Blower

60hz

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Product Specifications

Model: EL297DFV
Heating Type: Gas Furnace
Heating Stages: Two-Stage
Blower: Variable Speed Blower
Frequency: 60Hz
AFUE: 97%
Input Range: 44,000 to 110,000 Btuh
Nominal Cooling Capacity: 2 to 5 Tons

Product Usage Instructions

Installation

1. Ensure proper ventilation for the gas furnace.

2. Connect the gas supply line according to local codes and
regulations.

3. Install the furnace in a level position on a stable
surface.

Operation

1. Set the thermostat to the desired temperature.

2. The two-stage heating system will automatically adjust based
on the heating requirements.

3. Monitor the system for any unusual noises or
malfunctions.

Maintenance

1. Regularly clean or replace air filters to ensure optimal
performance.

2. Schedule annual professional maintenance to check for any
issues and ensure efficiency.

3. Keep the area around the furnace clear of debris and
obstructions.

FAQ

Q: Can the EL297V furnaces be twinned?

A: No, EL297V furnaces cannot be twinned.

Q: What is the maximum altitude for operation?

A: The gas furnace can operate at altitudes from 7501 to 10,000
ft.

Q: What type of blower does the furnace have?

A: The furnace is equipped with a Variable Speed Direct Drive
Blower.

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GAS FURNACES

EL297DFV

ELITE® SERIES

Downflow – Two-Stage Heating – Variable Speed Blower – 60Hz

RESIDENTIAL PRODUCT SPECIFICATIONS

Bulletin No. 211031 February 2024
Supersedes all previous versions

AFUE – 97% Input – 44,000 to 110,000 Btuh Nominal Add-on Cooling – 2 to 5 Tons
MODEL NUMBER IDENTIFICATION
EL 2 97 DF 070 X V 48 B

Unit Type EL = Elite® Series
Stages 2 = Two-Stage
AFUE 97 = 97%
Configuration DF = Downflow
Nominal Gas Heat Input 045 = 44,000 Btuh 070 = 66,000 Btuh 090 = 88,000 Btuh
110 = 110,000 Btuh

1 Cabinet Width B = 17-1/2 in. C = 21 in.
Nominal Add-On Cooling Capacity 36 = 3 tons 48 = 4 tons 60 = 5 tons
Blower V = Variable Speed Blower Motor
Low NOX X = Units meet California Nitrogen Oxides Standard (40 ng/J)
1 Indoor coils with the same letter designation physically match the furnace.

FEATURE HIGHLIGHTS

1. Lennox Duralok PlusTM Heat Exchanger 2. Secondary Heat Exchanger 3. Inshot Burners 4. Two-Stage Gas Control Valve 5. Two-Speed Combustion Air Inducer 6. SureLight® Integrated Furnace Control 7. Variable Speed Direct Drive Blower 8. Insulated Cabinet 9. Safety Interlock Switch 10. Gas Piping And Electrical Inlets
NOTE – EL297V FURNACES CANNOT BE TWINNED!

H

G

C

J

F

B

E

K D

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CONTENTS
Blower Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Approvals And Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
– Furnace/Coil Combined Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 – Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 – Optional Accessories – Venting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 – Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Gas Heat Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 High Altitude Derate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Installation Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Model Number Identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Optional Accessories – Order Separately . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Vent Lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Vent Lengths – Exhaust Using Ventilated Attic/Crawlspace Intake Air. . . . . . . . . . . . . . . . . . . . . . . . 13 Vent Lengths – Uninsulated Exhaust Pipe In Unconditioned Space . . . . . . . . . . . . . . . . . . . . . . . . . 11

EL297DFV / Page 2

APPROVALS AND WARRANTY
APPROVALS · AHRI Certified · CSA International Certified · Tested and rated according to US DOE test procedures and FTC labeling regulations · Units are approved for installations from 0 – 4500 ft. · ENERGY STAR® certified units are designed to use less energy, help save money on utility bills, and help protect the
environment · ISO 9001 Registered Manufacturing Quality System · Blower data from unit tests conducted in Lennox Laboratory air test chamber
California Only · These furnaces do not meet the South Coast Air Quality Management District (SCAQMD) Rule 1111 and San Joaquin Valley Air Pollution Control District (SJVAPCD) Rule 4905 NOx emission limit (14 ng/J) and cannot be installed within the SCAQMD and SJVAPCD areas. · These furnaces are approved by the California Energy Commission and meets California Nitrogen Oxides Standard (NOx) limits of 40 ng/J
WARRANTY · Duralok PlusTM Aluminized Steel Heat Exchanger:
· Limited lifetime (twenty year transferable) in residential applications · Limited ten years in non-residential applications · All other covered components: · Limited five years in residential installations · Limited one year in non-residential installations NOTE – Refer to Lennox Equipment Limited Warranty certificate included with unit for specific details.

FEATURES

APPLICATIONS
· Input capacities of 44,000, 66,000, 88,000 and 110,000 Btuh
· Energy efficiency (AFUE) – 97%
· Compact cabinet for downflow applications without any internal modifications to the unit
· Lennox add-on indoor coils, high-efficiency air cleaners and humidifiers can easily be added to furnace
· Shipped factory assembled with controls installed and wired
· Each unit factory test operated to ensure proper operation
ZONING APPLICATIONS
· The EL297V furnace is designed to work with the Lennox ® Smart Zoning System with the Lennox® Communicating Thermostat
· The Lennox Smart® Zoning System provides direct feedback to the furnace, controlling both airflow and heat output to precisely match the comfort requirements for up to four zones

HEATING SYSTEM
B Lennox Duralok PlusTM Heat Exchanger Assembly
· Lennox developed heat exchanger assembly consists of primary heat exchanger and secondary condenser coil assembly
· Main multi-pass crimped seam design clamshell type
· Constructed of heavy-gauge, aluminized steel
· Designed for normal expansion and contraction with maximum efficiency and minimum resistance to air flow
C · Secondary heat exchanger condenser coil constructed
of aluminum fins fitted to stainless steel tubes
· Coil is factory tested for leaks
· Condensate drain header box assembly located on front of coil
· Compact size permits low overall design of furnace cabinet
· Laboratory life cycle tested in excess of industry standards

EL297DFV / Page 3

FEATURES
HEATING SYSTEM (continued)
Lennox Designed Header Box · Header box on end of condenser coil collects flue
condensate for disposal through condensate drains
· The drains are located on each side of the cabinet for easy field installation of condensate drain trap
· Only one drain is used, the other drain is sealed
· Condensate drain trap is included with unit for field installation
Lennox Designed Flue Condensate Trap Assembly · Field installed outside the conditioned air stream
· Assembly can be mounted on either side of cabinet
· See Installation Instructions
· 90° street elbow furnished for ease of drain trap installation
· Drain connection can be made with field provided PVC pipe, PVC coupling, or vinyl tubing with hose clamp
· Drain cap on trap allows easy cleaning and winterizing
D Inshot Burners
· Aluminized steel inshot burners provide efficient, troublefree operation
· Burner venturi mixes air and gas in correct proportion for proper combustion
· Burner assembly is removable from the unit as a single component for ease of service
SureLight® Hot Surface Ignitor · Tough, reliable, long-life, trouble-free performance
· Silicon nitride ignitor
· Cemented to steatite block for protection against current leakage
· Ignition leads are constructed of nickel plated copper and are enclosed in high temperature Teflon® insulation for dependable operation
E Two-Stage Gas Control Valve
· 24 volt redundant combination two-stage gas control valve combines manual shut off switch (On-Off), automatic electric valve (dual) and gas pressure regulation into a compact combination control
F Two-Speed Combustion Air Inducer
· Permanent split capacitor (PSC), heavy duty blower prepurges heat exchanger and safely vents flue products
· Dual pressure switches (low fire/high fire) prove blower operation before allowing gas valve to open
· Operates only during heating cycle
Flame Rollout Switches (2) · Factory installed on burner box
· Switch provides protection from abnormal operating conditions
· Manual reset
Limit Control · Primary limit is accurately located on vestibule panel on
all units
· Automatic reset
EL297DFV / Page 4

Optional Accessories
High Altitude Orifice Kits · Required on all units for proper unit operation at
altitudes from 7501 to 10,000 ft.
· Kits are available for natural gas and LPG/propane
High Altitude Pressure Switch Kit · Required for proper unit operation on installations above
4500 ft.
Natural Gas to LPG/Propane Conversion Kit · Required for field changeover from natural gas to LPG/
Propane
LPG/Propane to Natural Gas Conversion Kit · Required for field changeover from LPG/Propane to
natural gas
Muffler (US Only) · Significantly reduces outdoor operating sound levels
· Two-inch diameter muffler is optional for 045 through 110 input models
NOTE – Two-inch muffler is optional for the 110 input model with a maximum vent pipe length of up to 29 ft. Three-inch diameter muffler is optional for 110 and 135 input models.
NOTE – Three-inch muffler is optional for the 110 input model with a minimum vent pipe length of 30 ft.
· Installed vertically in the exhaust piping
· See Optional Accessory Dimension Drawing
DIRECT VENT / NON-DIRECT VENT SEALED COMBUSTION SYSTEM
· Furnace features a “sealed combustion” system and can be installed in either Direct Vent or Non-Direct applications
· In Direct Vent applications, combustion air is supplied from outdoors and flue gases are discharged outdoors
· In Non-Direct Vent applications, combustion air is supplied from indoors and flue gases are discharged outdoors
NOTE – Lennox has approved the use of DuraVent® PolyPro® and Centrotherm InnoFlue® manufactured vent pipe and terminations as an alternative to PVC vent pipe. Must be ordered separately.
· Tested and listed to the ULC S636 standard in Canada
· The polypropylene venting system must follow the uninsulated and unconditioned space vent lengths listed in the table on Page 11
· Refer to the Installation Instructions for additional details
Flue Coupling · Assists with exhaust flue piping connection and servicing
· Includes flexible one 2 inch rubber coupling and two adjustable bands
· Approved for all Lennox 90% furnaces

FEATURES

DIRECT VENT / NON-DIRECT VENT SEALED COMBUSTION SYSTEM (continued)
Termination Kits · Facilitates installation of combustion air intake pipe and
flue exhaust pipe
· Refer to venting table in this bulletin to determine pipe size needed and proper termination kit required
· Certain Termination Kits are certified to ULC S636 standard for use in Canada only
· See Optional Accessories table and dimension drawings
Concentric – Direct Vent Applications
· 2 or 3 inch kit contains concentric termination assembly, reducer bushing and 45 degree elbow
· 2 inch kit for -045-070 models contains an outdoor exhaust accelerator
· Kit requires single hole penetration of roof or wall for installation
· Roof Termination Flashing Kit is available for use with 2 inch Kits

CONTROLS
G SureLight® Control (Lennox® Communicating)
· Advanced control communicates information about various operating parameters in the furnace to the optional Lennox® Communicating Thermostat to constantly maintain the highest level of comfort and performance available
· Auto Configuration – On start-up the control automatically sends a description of the unit to the optional Lennox® Communicating Thermostat to automatically configure the number of stages and features available
· Terminals for connecting a conventional heating/cooling thermostat are also provided on the control
· Control also features Innovative AirFlexTM technology which allows custom blower settings based on the application

· CSA certified
Flush-Mount
· Kit contains flush-mount termination, accelerator, mounting template and hardware
· Kit may be used with 2, 2-1/2 or 3 in. pipe
Wall Assembly Close Couple (US Only) – Direct Vent Applications
· 2 or 3 inch kit consists of close-couple, side-by-side PVC piping with galvanized steel wall cover plate for sealing and isolating piping penetration of the wall
· Piping spacing and length is sized for proper wall installations
· CSA certified

· Thermostat Control – For optimal performance, the use of a high-quality, digital two-stage thermostat with adjustable settings for first stage/second stage, on/off differentials and adjustable stage timers is recommended

Furnace Input Staging Options

Thermostat Type Input Staging Available

Lennox® Communicating Thermostat

Two-Stage

Two-Stage (65 and 100%)

(Conventional)

Single-Stage (Conventional)

Close Couple WTK (Canada Only) – Direct Vent Applications

· Safety Controls – Flame sensor utilizes flame rectification for safe and reliable operation

· 2 or 3 inch kit contains one insulated faceplate, one insulated exhaust pipe, elbow and fittings. Certified to ULC S636 standard

· Should flame fail to ignite, control will initiate 4 reattempts at ignition before locking out unit operation for 60 minutes

NOTE – Maintain a maximum of 6 inches between the inlet and outlet openings in the installation of the pipes.
Roof Termination Flashing Kit
· For vertical venting through a roof
· 2 or 3 inch kit contains two neoprene rubber roof flashings
· Vent pipe and insulation not furnished
· Flashing Kit can also be used with Concentric Vent Termination Kits used in vertical venting rooftop applications
Left Side Vent Kit

· Watchguard type circuit automatically resets ignition control after one hour of continuous thermostat demand after unit lockout, eliminating nuisance calls for service
· Display LED – Seven segment LED displays alphanumeric information related to diagnostics as well as system operation and status
· Diagnostic codes are held in non-volatile memory, immune from power interruptions
· Holds up to ten diagnostic codes in order of occurrence for recall on demand
· Port on blower door allows for easy viewing

· Allows venting out the left side of the cabinet. Kit contains left vent tube and seal plate

EL297DFV / Page 5

FEATURES
CONTROLS (continued)
DIP Switch Settings · Select Thermostat Used – Single-Stage or Two-Stage
· Two selectable second stage recognition times (7 and 12 minutes) are available on the control when the furnace is used with a single-stage thermostat
· When used with a two-stage thermostat, furnace will only initiate second stage operation with a second stage thermostat demand
· Heating Speeds – A combination of DIP switch settings allow the following motor speed selection settings within the heating speed selected for fine tuning air volume:
· Factory default
· 6%, 12%, 18% or 24% increase
· 6%, 12% or 18% decrease
· See Blower Performance tables
· Cooling Speeds – A combination of DIP switch settings allow the following motor speed selection settings within the cooling speed selected for fine tuning air volume:
· Factory default
· 10% increase
· 10% decrease
· See Blower Performance tables
· Blower Speed Ramping (Cooling Mode) – DIP switch settings allow one of four blower speed profiles during cooling operation
· Profile A (factory setting) – Motor runs at 50% for 30 seconds, then at 82% for 7-1/2 minutes, then at 100% (if needed) until demand is satisfied. Once demand is met, motor runs at 50% for 30 seconds, then ramps down to stop
· Profile B – Motor runs at 82% for 7-1/2 minutes and then at 100% (if needed) until demand is satisfied. Once demand is met,motor ramps down to stop
· Profile C – Motor runs at 100% until demand is satisfied. Once demand is met, motor runs at 100% for 60 seconds, then ramps down to stop
· Profile D – Motor runs at 100% until demand is satisfied. Once demand is met, motor ramps down to stop
· Dehumidification (Active or Humiditrol® Option) – A jumper on the control must be clipped to enable active dehumidification and/or operation with a Humiditrol® Whole-Home Dehumidification System
· A humidity controlling thermostat or device is also required
· During a call for cooling, air volume is automatically reduced, forcing humidity removal by the air conditioner or heat pump system (single stage units or two-stage units running at 2nd stage)
· After the humidity has reached the desired set-point the cooling air volume returns to its designed rate
· A dehumidification signal from the thermostat reduces the cooling cfm to 70% of the requested cooling cfm

· Dual-Fuel Operation – A jumper on the control must be clipped to enable operation with a single or two-stage heat pump. The indoor blower is started without delay when a call for heat is received
· Two-Stage Compressor Operation – A jumper on the control must be clipped to enable operation with a twostage compressor
· The cooling blower speeds for first and second stage cooling will be dictated by the applicable DIP switch settings
· Lennox System Operations Monitor Connection Monitors outdoor unit operation (communicating mode)
· Blower On/Off Time (Heating) – Blower on time is fixed at 30 seconds, blower off time is adjustable from 60, 90, 120 and 180 seconds (factory setting – 90 seconds)
· Blower On/Off Time (Cooling) – For air-conditioning applications, blower on time is 2 seconds following thermostat demand for cooling
· See Blower Speed Ramping (Cooling Mode) profiles for various blower off details
· Controls evaporator humidity by controlling blower and compressor speed on two-stage outdoor units when used with the Lennox® Communicating Thermostat or the CS7500 Thermostat
· Continuous Blower Speed – Adjustable continuous blower speed is a percentage of the high cooling speed selection
· Two selectable options (via DIP switch settings) of 28% and 38% (default setting)
· Accessory Terminal – One accessory terminal furnished for additional power supply requirements for 120 volt (less than 1 amp) powered air cleaners
· One unpowered pair of contacts are provided for humidifier connections and may be connected to 24V or 120V
· Control is factory installed in the unit control box
24 Volt Transformer · Furnished and factory installed in control box
· 40VA transformer has circuit breaker wired in series
Field Wiring Make-Up Box · Furnished for line voltage wiring
· Factory installed internally on left side of furnace
· Box may be installed internally on right side of furnace

EL297DFV / Page 6

FEATURES
CONTROLS (continued)
Optional Accessories
S40 Smart Wi-Fi Thermostat (part of the Lennox® Residential Communicating Control System) · Recognizes and connects to all Lennox® Communicating
products to automatically configure and control the heating/cooling system (based on userspecified settings) for the highest level of comfort, performance and efficiency
· Recognizes model and serial number information for Lennox® Communicating products to simplify system setup
· Lennox Smart Room Sensors, Lennox Wireless Extenders and Lennox Smart Air Quality Monitor can be added to the system
· Smart home automation compatible with Amazon Alexa®, Google Assistant, Control4® and Building36®
· Sends service alerts and reminders
· Lennox Smart Thermostat App features Wi-Fi remote temperature monitoring and adjustment through a home wireless network apps for smartphones or tablets
· Lennox Smart Technician App allows installer to manage systems in the home
· Service Dashboard features online real-time monitoring and advanced diagnostics of installed Lennox® Communicating systems
· Simple easy-to-use touchscreen allows complete system configuration
· Scheduled maintenance alerts, system warnings and troubleshooting are also displayed on thermostat screen
· Easy to read 7 inch high definition color display (measured diagonally)
· Conventional outdoor units (not Lennox® Communicating) can easily be added and controlled by the S40 Thermostat
· Installer setup screens allow quick and simple system configuration without a manual, Installer can also run tests on complete system or individual components for easy maintenance and troubleshooting
· Serial communications bus (RSBus), with less wiring than a conventional heating/cooling system, allows system communication
· Uses standard 4-wire unshielded thermostat wiring
· High Definition Color Display with Subbase and wallplate furnished for easy installation
NOTE – See the Lennox® S40 Thermostat Product Specifications bulletin in the Controls section for more information.

E30 Smart Wi-Fi Thermostat · Wi-Fi enabled, electronic 7-day, universal, multi-stage,
programmable, touchscreen thermostat
· 3 Heat/2 Cool
· Auto-changeover
· Controls dehumidification during cooling mode and humidification during heating mode
· Offers enhanced capabilities including humidification / dehumidification / dewpoint measurement and control, Humiditrol® control, and equipment maintenance reminders
· Easy to read 7 in. color touchscreen (measured diagonally)
· LCD display with backlight shows the current and set temperature, time, inside relative humidity, system status (operating mode and schedules) and outside temperature (optional outdoor sensor required)
· Smooth Setback Recovery starts system early to achieve setpoint at start of program period
· Compressor short-cycle protection (5 minutes)
· Up to four separate schedules are available plus Schedule IQTM
· One-Touch Away Mode – A quick and easy way to set the cooling and heating setpoints while away
· Smart AwayTM – Uses geo-fencing technology to determine when the homeowner is within a predetermined distance from the home to operate the system when leaving, away and arriving
· Wi-Fi remote monitoring and adjustment through a home wireless network for desktop PCs, laptops and apps for smartphones or tablets
· Smart home automation compatible with Apple HomeKitTM, Amazon Alexa®, Google Assistant and IFTTT
· Service Dashboard features online real-time monitoring of installed Lennox® Communicating systems
· High Definition Color Display with Subbase, Smart Hub Controller, wallplate (for retrofit installations) furnished for easy installation
· See the E30 Smart Wi-Fi Thermostat Product Specifications bulletin for more information
Remote Outdoor Temperature Sensor · Allows thermostat to display outdoor temperature
· Automatically detected when connected to thermostat
NOTE – Sensor is required for the Enhanced Dehumidification Accessory (EDA).
NOTE – Sensor is furnished as standard with Lennox® Communicating outdoor units, optional for conventional units.

EL297DFV / Page 7

FEATURES
CONTROLS (continued)
Optional Accessories
Thermostat · Thermostat is not furnished with unit
· See Lennox Price Book for selection
BLOWER
H Variable Speed Direct Drive Blower.
· Each blower assembly statically and dynamically balanced
· Blower assembly easily removed for servicing
Variable Speed Blower Motor · Variable speed motor maintains specified air volume
from 0 though 0.8 in. w.g. (heating) and 0 through 1.0 in. w.g. (Cooling) static range
· Variable speed operation is achieved by the use of an ECM (Electronically Commutated Motor) motor
· Motor is controlled by furnace control
· Change in blower speed is easily accomplished by simple DIP switch change on furnace control
· Motor is resiliently mounted
· When furnaces are used with the Lennox® Smart Zoning System and the Lennox® Communicating Thermostat, the blower motor operates from predetermined minimum – maximum air volumes to satisfy zone requirements
· See Blower Data tables
CABINET
· Low-profile, narrow width allows easy installation
· Heavy-gauge, cold rolled steel construction
· Pre-painted cabinet finish
· Flanges provided on supply air opening for ease of plenum connection or alignment with indoor coil
I · Insulated with foil faced insulation on sides and back
of heating compartment and mat faced insulation in blower compartment
· Sealed blower compartment
· Inner blower compartment access panel seals blower compartment from air leakage
· Cabinet door can be removed without any tools
· Complete service access
J · Safety interlock switch automatically shuts off power to
unit when blower compartment access door is removed
K · Gas piping and electrical inlets are provided in both sides
of cabinet
Coil Match-Up · All Lennox downflow indoor coils will physically match
the furnace supply air opening with the same letter designation (A, B, C, D) as in the furnace model number
Low Leakage Cabinet · All models have less than 2% air leakage
· Meets ANSI/ASHRAE Standard 193-2010 “Method of Test for Determining the Air Tightness of HVAC Equipment”
EL297DFV / Page 8

Optional Accessories
Condensate Drain Heat Cable Kits · Self-limiting wattage heat cable prevents condensate
drain from freezing in unconditioned areas
· Available in 6 or 24 ft. lengths
Crawl Space Vent Drain Kit · Allows venting through a crawl space for downflow
applications
· Kit for Canada is certified to ULC S636
· Includes 2 or 3 in. sanitary tee, 2 in. PVC assembly, PVC boot and clamp
Downflow Combustible Flooring Base · Required for heating only units installed on combustible
floors
· Not required in add-on cooling applications
· See Dimension Drawing
High Performance Economizer (Commercial Applications Only) · Designed for applications requiring outdoor air to be
utilized in a commercial HVAC system
· Allows the entry of fresh outdoor air for free cooling, reducing the requirement for mechanical cooling
· Heavy gauge galvanized steel cabinet lined with thick fiberglass insulation
· Mixed air sensor, outdoor air sensor and 24VAC transformer furnished
· Approved for California Title 24 building standards. ASHRAE 90.1-2010 compliant
· See separate Product Specifications bulletin for additional information and available control and sensor options
NOTE – Economizer is not Lennox® Communicating compatible.
FILTER (not furnished)
· Filter and provisions for external mounting must be field provided
Optional Accessories
Downflow Filter Cabinet · Filter cabinet mounts directly on top of furnace
· “B and “C” width cabinets have two filters
· Filter rails are furnished
· Front access for servicing
· Cleanable filter(s) are furnished

SPECIFICATIONS

Gas Heating Performance
High Fire

Model No. EL297DF045XV36B EL297DF070XV48B EL297DF090XV60CEL297DF110XV60C

1 AFUE

97%

Input – Btuh

44,000

66,000

88,000

110,000

Output – Btuh

43,000

64,000

86,000

108,000

Temperature rise range – °F

35-65

40-70

45-75

Gas Manifold Pressure (in. w.g.) Nat. Gas / LPG/Propane

3.5 / 10.0

Low Fire

Input – Btuh Output – Btuh

29,000 28,000

43,000 42,000

57,000 56,000

72,000 70,000

Temperature rise range – °F

20 – 50

25 – 55

30 – 60

35 – 65

Gas Manifold Pressure (in. w.g.) Nat. Gas / LPG/Propane

1.7 / 4.5

High static in. w.g.

Heating

0.8

Cooling

1.0

Connections

Intake / Exhaust Pipe (PVC)

2 / 2

in.

Gas pipe size IPS

1/2

Condensate Drain Trap (PVC pipe) – i.d.

3/4

with furnished 90° street elbow 3/4 slip x 3/4 Mipt 3/4 slip x 3/4 Mipt 3/4 slip x 3/4 Mipt 3/4 slip x 3/4 Mipt

with field supplied (PVC coupling) – o.d. 3/4 slip x 3/4 MPT 3/4 slip x 3/4 MPT 3/4 slip x 3/4 MPT 3/4 slip x 3/4 MPT

Indoor Blower

Wheel nom. diameter x width – in. Motor output – hp

10 x 9 1/2

11 x 10 3/4

11 x 11 1

Tons of add-on cooling

2 – 3

2.5 – 4

3 – 5

Air Volume Range – cfm

545 – 1360

575 – 1800

890 – 2130

860 – 2180

Electrical Data

Voltage

Blower motor full load amps

7.7

120 volts – 60 hertz – 1 phase

10.1

12.8

Maximum overcurrent protection

15

20

Shipping Data

lbs. – 1 package

130

145

165

172

NOTE – Filters and provisions for mounting are not furnished and must be field provided.
1 Annual Fuel Utilization Efficiency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized furnaces.

INSTALLATION CLEARANCES
Sides Rear Top/Plenum Front Front (service/alcove) Floor

1 0 inches (0 mm) 0 inches (0 mm) 1 inch (25 mm) 0 inches (0 mm) 24 inches (610 mm)
2 Combustible

NOTE – Air for combustion must conform to the methods outlined in the National Fuel Gas Code (NFPA 54/ ANSI-Z223.1) or the National Standard of Canada CAN/CSA-B149.1 “Natural Gas and Propane Installation Code”.
NOTE – In the U.S. flue sizing must conform to the methods outlined in the current National Fuel Gas Code (NFPA 54/ANSI-Z223.1) or applicable provisions of local building codes. In Canada flue sizing must conform to the methods outlined in National Standard of Canada CAN/CSA-B149.1.
1 Allow proper clearances to accommodate condensate trap and vent pipe installation.
2 Clearance for installation on combustible floor if Optional Downflow Combustible Flooring Base is installed between furnace and combustible floor. Not required in add-on cooling applications if installed in accordance with local codes or National Fuel Gas Code ANSI-Z223.1 or CAN/CGA-149.1,.2. Do not install the furnace directly on carpeting, tile, or other combustible materials other than wood flooring.

EL297DFV / Page 9

OP TIO NAL ACCES S ORIES – ORDER SEPARATELY
NOTE – FURNACES CANNOT BE TWINNED!
CABINET ACCESSORIES

“B” Width Models

“C” Width Models

Downflow Combustible Flooring Base High Performance Economizer (Commercial Only) CONDENSATE DRAIN KITS

11M60 10U53

11M61 10U53

Condensate Drain Heat Cable Crawl Space Vent Drain Kit CONTROLS

6 ft. 24 ft.
US Canada

26K68 26K69 51W18 15Z70

S40 Smart Wi-Fi Thermostat 1 Discharge Air Temperature Sensor E30 Smart Wi-Fi Thermostat 2 Remote Outdoor Temperature Sensor FILTERS

22V24 88K38 20A65 X2658

3 Downflow Filter Cabinet VENTING

No. and Size of filter – in.

51W07 (2) 16 x 20 x 1

51W08 (2) 16 x 20 x 1

Flue Coupling

2 in.

17H92

Left Side Vent Kit

2 or 3 in.

87W73

1 Optional for service diagnostics. 2 Remote Outdoor Temperature Sensor is used with conventional (non-Lennox® Communicating) outdoor units (sensor is furnished with Lennox® Communicating
outdoor units). Allows the thermostat to display outdoor temperature. Required in dual-fuel and EDA applications. 3 Cleanable polyurethane, frame-type filter. 4 NOTE – The curved exhaust pipe furnished with the Left Side Vent Kit counts as one additional 2 in. diameter 90° elbow. When using 3 in. diameter pipe, the furnished
curved exhaust pipe and field provided fittings to transition from 2 in. to 3 in. count as 20 feet of equivalent pipe on all units.
NOTE – Termination Kits (44W92, 44W93, 30G28, 51W12, 81J20) and Crawl Space Vent Drain Kit (15Z70) are certified to ULC S636 standard for use in Canada only.

EL297DFV / Page 10

OUTDOOR TERMINATION KIT USAGE
Standard Terminations

Concentric Terminations

Input Size

Vent Pipe Diameter (in.)

Flush Mount
Kit

Wall Kit

2 inch

3 inch

Field Fabricated
Exhaust

Concentric Kit

1-1/2 inch

2 inch

3 inch

51W11 (US) 22G44 (US) 44J40 (US) Accelerator 71M80 (US) 69M29 (US) 60L46 (US) 5 51W12 (CA) 5 30G28 (CA) 5 81J20 (CA) Size Required 5 44W92 (CA) 5 44W92 (CA) 5 44W93 (CA)

1 1-1/2

4 YES

YES

2 YES

1-1/2 in.

3 YES

– – –

2

4 YES

YES

2 YES

1-1/2 in.

3 YES

– – –

045

2-1/2

4 YES

YES

2 YES

1-1/2 in.

3 YES

– – –

3

4 YES

YES

2 YES

1-1/2 in.

3 YES

– – –

1 1-1/2

4 YES

YES

2 YES

1-1/2 in.

3 YES

– – –

2

4 YES

YES

2 YES

1-1/2 in.

3 YES

– – –

070

2-1/2

4 YES

YES

2 YES

1-1/2 in.

3 YES

– – –

3

4 YES

YES

2 YES

1-1/2 in.

3 YES

– – –

2

4 YES

– – –

YES

2 in.

– – –

YES

090

2-1/2

4 YES

– – –

YES

2 in.

– – –

YES

3

4 YES

– – –

YES

2 in.

– – –

YES

2

YES

– – –

YES

2 in.

– – –

YES

110

2-1/2

YES

– – –

YES

2 in.

– – –

YES

3

YES

– – –

YES

2 in.

– – –

YES

NOTE – Standard Terminations do not include any vent pipe or elbows external to the structure. Any vent pipe or elbows external to the structure must be included in total vent length calculations. See Vent Length Tables.
1 2 inch to 1-1/2 inch reducer required, must be field provided. 2 Requires field provided 1-1/2 in. outdoor exhaust accelerator. 3 Concentric Kits 71M80 and 44W92 include 1-1/2 in. outdoor exhaust accelerator, required when used with 045 and 070 input models. Accelerator is not used with 090,
110, 135 input models. When using 1-1/2 in. piping, the pipe must be transitioned to 2 in. pipe when used with the Concentric Kit. 4 Flush Mount Kit 51W11 and 51W12 includes 1-1/2 in. outdoor exhaust accelerator, required when used with 045, 070 and 090 input models. Accelerator is not used with
110 or 135 input models. When using 1-1/2 in. piping, the pipe must be transitioned to 2 in. pipe when used with the Flush Mount Kit. 5 Termination Kits 30G28, 44W92, 44W93, 51W12 and 81J20 are certified to ULC S636 standard for use in Canada only.

VENT LENGTHS – UNINSULATED EXHAUST PIPE IN UNCONDITIONED SPACE

Unit Input Size

1 Winter Design Vent Pipe Temperatures Diameter

045

070

090

2 Maximum Uninsulated Exhaust Vent Length (ft.)

PVC

PolyPro InnoFlue

PVC

PolyPro InnoFlue

PVC

PolyPro InnoFlue

110

PVC

PolyPro InnoFlue

1-1/2 in.

22

N/A

20

N/A

32 to 21°F

2 in.

21

18

33

30

46

42

30

2-1/2 in.

16

N/A

26

N/A

37

N/A

36

N/A

3 in.

12

21

30

29

1-1/2 in.

12

N/A

20

N/A

20 to 1°F

2 in.

11

9

19

17

28

25

27

24

2-1/2 in.

7

N/A

14

N/A

21

N/A

20

N/A

3 in.

N/A

9

16

14

1-1/2 in.

8

N/A

13

N/A

0 to 20°F

2 in.

6

4

12

10

19

16

18

15

2-1/2 in.

N/A

7

N/A

13

N/A

12

N/A

3 in.

N/A

8

7

NOTE – Concentric terminations are equivalent to 5 ft. of straight pipe and should be included when measuring total pipe length. 1 Refer to 99% Minimum Design Temperature table provided in the current edition of ASHRAE Handbook- Fundamentals. 2 Maximum Equivalent Vent Length permitted is defined as Total Length (linear feet) of vent pipe, plus equivalent length (ft.) of fittings, plus equivalent length (ft.) of
termination.
VENTING NOTES – Concentric Terminations are equivalent to 5 ft. of straight pipe and should be included when measuring total pipe length. One 90° elbow is equivalent to 5 feet of straight vent pipe. Two 45° elbows are equal to one 90° elbow. One 45° elbow is equivalent to 2.5 feet of straight vent pipe.
PolyPro® poly-propylene vent pipe is a registered trademark of DuraVent®.
Innoflue® is a registered trademark of Centrotherm Eco Systems.

EL297DFV / Page 11

VENT LENGTHS

STANDARD TERMINATION AT ELEVATION 0 – 4500 ft.

Pipe Size

1-1/2 in.

2 in.

2-1/2 in.

3 in.

Input 045 070 090 110 045 070 090 110 045 070 090 110 045 070 090 110

1 20 15 N/A N/A 71 56 34 14 105 105 83 48 128 127 108 108

2 15 10 N/A N/A 66 51 29 9 100 100 78 43 123 122 103 103

3 10 N/A N/A N/A 61 46 24 4 95 95 73 38 118 117 98 98

4 N/A N/A N/A N/A 56 41 19 N/A 90 90 68 33 113 112 93 93 No. of 5 N/A N/A N/A N/A 51 36 14 N/A 85 85 63 28 108 107 88 88 90 ELL 6 N/A N/A N/A N/A 46 31 9 N/A 80 80 58 23 101 102 83 83
7 N/A N/A N/A N/A 41 26 4 N/A 75 75 53 18 98 97 78 78

8 N/A N/A N/A N/A 36 21 N/A N/A 70 70 48 13 93 92 73 73

9 N/A N/A N/A N/A 31 16 N/A N/A 65 65 43 8 88 87 68 68

10 N/A N/A N/A N/A 26 11 N/A N/A 60 60 38 3 83 82 63 63

STANDARD TERMINATION ELEVATION 4501 – 10,000 ft.

Pipe Size

1-1/2 in.

2 in.

2-1/2 in.

3 in.

Input 045 070 090 110 045 070 090 110 045 070 090 110 045 070 090 110 1 20 15 N/A N/A 71 56 34 N/A 105 105 83 48 128 127 108 108 2 15 10 N/A N/A 66 51 29 N/A 100 100 78 43 123 122 103 103 3 10 N/A N/A N/A 61 46 24 N/A 95 95 73 38 118 117 98 98 4 N/A N/A N/A N/A 56 41 19 N/A 90 90 68 33 113 112 93 93
No. of 5 N/A N/A N/A N/A 51 36 14 N/A 85 85 63 28 108 107 88 88 90 ELL 6 N/A N/A N/A N/A 46 31 9 N/A 80 80 58 23 103 102 83 83
7 N/A N/A N/A N/A 41 26 4 N/A 75 75 53 18 98 97 78 78 8 N/A N/A N/A N/A 36 21 N/A N/A 70 70 48 13 93 92 73 73 9 N/A N/A N/A N/A 31 16 N/A N/A 65 65 43 8 88 87 68 68 10 N/A N/A N/A N/A 26 11 N/A N/A 60 60 38 3 83 82 63 63

CONCENTRIC TERMINATION AT ELEVATION 0 – 4500 ft.

Pipe Size

1-1/2 in.

2 in.

2-1/2 in.

3 in.

Input 045 070 090 110 045 070 090 110 045 070 090 110 045 070 090 110 1 15 10 N/A N/A 63 48 32 12 95 95 79 44 111 111 104 104 2 10 N/A N/A N/A 58 43 27 7 90 90 74 39 106 106 99 99 3 N/A N/A N/A N/A 53 38 22 2 85 85 69 34 101 91 94 94 4 N/A N/A N/A N/A 48 33 17 N/A 80 80 64 29 96 96 89 89
No. of 5 N/A N/A N/A N/A 43 28 12 N/A 75 75 59 24 91 91 84 84 90 ELL 6 N/A N/A N/A N/A 38 23 7 N/A 70 70 54 19 96 86 79 79
7 N/A N/A N/A N/A 33 18 2 N/A 65 65 49 14 81 81 74 74 8 N/A N/A N/A N/A 28 13 N/A N/A 60 60 44 9 76 76 69 69 9 N/A N/A N/A N/A 23 8 N/A N/A 55 55 39 4 71 71 64 64 10 N/A N/A N/A N/A 18 3 N/A N/A 50 50 34 N/A 66 66 59 59

CONCENTRIC TERMINATION ELEVATION 4501 – 10,000 ft.

Pipe Size

1-1/2 in.

2 in.

2-1/2 in.

3 in.

Input 045 070 090 110 045 070 090 110 045 070 090 110 045 070 090 110 1 15 10 N/A N/A 63 48 32 N/A 95 95 79 44 111 111 104 94 2 10 N/A N/A N/A 58 43 27 N/A 90 90 74 39 106 106 99 99 3 N/A N/A N/A N/A 53 38 22 N/A 85 85 69 34 101 101 94 94 4 N/A N/A N/A N/A 48 33 17 N/A 80 80 64 29 96 96 89 89
No. of 5 N/A N/A N/A N/A 43 28 12 N/A 75 75 59 24 91 91 84 84 90 ELL 6 N/A N/A N/A N/A 38 23 7 N/A 70 70 54 19 86 86 79 79
7 N/A N/A N/A N/A 33 18 2 N/A 65 65 49 14 81 81 74 74 8 N/A N/A N/A N/A 28 13 N/A N/A 60 60 44 9 76 76 69 69 9 N/A N/A N/A N/A 23 8 N/A N/A 55 55 39 4 71 71 64 64 10 N/A N/A N/A N/A 18 3 N/A N/A 50 50 34 N/A 66 66 59 59

EL297DFV / Page 12

VENT LENGTHS – EXHAUST USING VENTILATED ATTIC/CRAWLSPACE INTAKE AIR

STANDARD TERMINATION AT ELEVATION 0 – 10,000 ft.

Pipe Size

1-1/2 in.

2 in.

2-1/2 in.

3 in.

Input 045 070 090 110 045 070 090 110 045 070 090 110 045 070 090 110

1 15 10 N/A N/A 61 46 24 4 90 90 68 33 108 107 88 88

2 10 N/A N/A N/A 56 41 19 N/A 85 85 63 28 103 102 83 83

3 N/A N/A N/A N/A 51 36 14 N/A 80 80 58 23 98 97 78 78

4 N/A N/A N/A N/A 46 31 9 N/A 85 75 63 18 93 92 73 73

No. of 5 N/A N/A N/A N/A 41 26 4 N/A 70 70 48 13 88 87 68 68 90 ELL 6 N/A N/A N/A N/A 36 21 N/A N/A 65 65 43 8 83 82 63 63

7 N/A N/A N/A N/A 31 16 N/A N/A 60 60 38 3 78 77 58 58

8 N/A N/A N/A N/A 26 11 N/A N/A 55 55 33 N/A 73 72 53 53

9 N/A N/A N/A N/A 21 6 N/A N/A 50 50 28 N/A 68 67 48 48

10 N/A N/A N/A N/A 16 1 N/A N/A 45 45 23 N/A 63 62 43 43

GAS HEAT ACCESSORIES

Input
045 070 090 110

High Altitude Pressure Switch Kit

Natural Gas to LPG/Propane
Kit

4501 – 7500 ft. 7501 – 10,000 ft. 0 – 7500 ft.

14A51

14A53

11K51

14A48

14A54

11K51

14A54

14A53

11K51

25B93

14A45

11K51

LPG/Propane to Natural Gas
Kit 0 – 7500 ft.
77W09 77W09 77W09
77W09

Natural Gas High Altitude
Orifice Kit 7501- 10,000 ft.
73W37 73W37 73W37
73W37

LPG/Propane High Altitude
Orifice Kit 7501- 10,000 ft.
11K46 11K46 11K46
11K46

Muffler (US Only)
15Y66 (2-inch) 15Y66 (2-inch) 15Y66 (2-inch) 1 15Y66 (2-inch) 16A56 (3-inch)

1 Two-inch diameter muffler (15Y66) is optional for 110 input model with a maximum vent pipe length of up to 29 ft. Three-inch diameter muffler (16A56) is optional for 110 input model with a minimum vent pipe length of 30 ft.

HIG H ALT IT UDE DERATE
NOTE – Units may be installed at altitudes up to 10,000 ft. At altitudes above 4501 ft. the unit must be derated to match the manifold pressure information shown below. Units installed at altitudes of 4501 to 10,000 ft. require a pressure switch change. Units installed at altitudes of 7501 to 10,000 ft. require an orifice change. See the Gas Heat Accessories table for ordering information.
NOTE – This is the only permissible derate for these units.
NOTE – In Canada, certification for installations at elevations over 4500 feet is the jurisdiction of local authorities.

Input All Sizes

Gas
Natural LPG/Propane

Manifold Pressure in. w.g.

0 – 4500 ft. 4501 – 5500 ft. 5501 – 6500 ft. 6501 – 7500 ft. 7501 – 10,000 ft.

Low Fire
1.7
4.5

High Fire
3.5
10.0

Low Fire
1.6
4.2

High Fire
3.3
9.4

Low Fire
1.5
4.0

High Fire
3.2
9.1

Low Fire
1.5
3.9

High Fire
3.1
8.9

Low Fire
1.7
4.5

High Fire
3.5
10.0

Supply Line Pressure in. w.g.
0 – 10,000 ft.
Min. Max.
4.5 13.0 11.0 13.0

EL297DFV / Page 13

DIMENSIONS

UNIT

Flue Condensate Trap Assembly Furnished for external field installation on either side of unit. (See installation instructions for additional information.)
A B
AIR FLOW

3/4 (19)

Supply C Air

FRONT VIEW

9/16 (14)

7 (178)

COMBUSTION AIR INTAKE
EXHAUST AIR OUTLET

B

RETURN AIR OPENING

2-1/16 (52)

5 (127)

2-1/4

9/16

(57)

(14)

TOP VIEW

1-1/2 (38) Front Panel

9/16 (14)

4-1/2

1 (25)

(114)

1-7/8 (48)

33 (838)

15 (381)

5-3/16 (132)
2-1/16 (52)

2 (51) Either Side
GAS PIPING INLET (Either Side)

9-1/8 (232) Right 6-9/16 (167) Left

3/4 (19)

27-3/4 (705)

6-1/4 (157)

19-7/16 (494)

OPTIONAL LEFT SIDE VENT LOCATION (Kit Required)
ELECTRICAL INLET (Either Side)
ALTERNATE RIGHT SIDE VENT LOCATION (Parts Furnished)
ELECTRICAL INLET (Either Side)
CONDENSATE TRAP CONNECTION
(Either Side)

6-7/16 (163) Either Side

9 (229) Either Side

19-1/4 Supply (489) Air
SIDE VIEW

9/16 (14)
3/4 (19)

Model No.
EL297DF045XV36B EL297DF070XV48B EL297DF090XV60C EL297DF110XV60C

A

in.

mm

17-1/2

446

21

533

B

in.

mm

16-3/8

416

19-7/8

505

C

in.

mm

16

406

19-1/2

495

EL297DFV / Page 14

DIMENSIONS

DOWNFLOW FILTER CABINET
“B AND “C” WIDTH FURNACES (Two Filters)

OPTIONAL ACCESSORIES

20-1/2 (521)

17-1/2 (445) “B” Box 21 (533) “C” Box

FILTERS (2)

17-1/2 (445)

FILTER ACCESS DOOR
NOTE: Return Air Opening (W x D) “B” Box 16-1/2 x 19-5/8 (419 x 498)
“C” Box 20 x 19-5/8 (508 x 498)
DOWNFLOW COMBUSTIBLE FLOORING BASE

1-1/2 (38)

50-1/2 (1283 )

FURNACE

33 (838)

DOWN FLOW FURNACE

1-1/2 (38)

SUPPLY AIR
OPENING
19-13/16 (503)
B

1-1/2 (38)

27-1/4 (692)

21-13/16 (554)

Front Of Furnace
A
TOP VIEW

1-1/2 (38)
SIDE VIEW

22 (559)

DOWNFLOW COMBUSTIBLE
FLOORING BASE
FLOOR OPENING

Cabinet Catalog Width Number

A in. mm

B 11M60 19-9/16 497

C 11M61 23-1/16 586

B

in.

mm

16-9/16 421

20-1/16 510

C in. mm 18-3/4 476 22-1/4 565

C
EL297DFV / Page 15

DIMENSIONS

OPTIONAL ACCESSORIES – VENTING
FLUSH-MOUNT VENT TERMINATION KIT 51W11 (US) or 51W12 (CANADA)

2-3/8 (60)

With 2 or 2-1/2 in. (51 or 64 mm) PVC pipe

Exhaust

Intake

(Behind Plate)

Seal all openings (typical)

With 3 in. (76 mm) PVC pipe

Exhaust

Intake

(Behind Plate)

12 (305) minimum (recommended)

2 (51) PVC pipe

3 (76) PVC pipe

NOTE – PVC pipe and fittings are not furnished When required Use and must be field furnished.
Field Provided
2-1/2 to 2 in. (64 to 51 mm) Coupling

2-1/2 (64) PVC pipe

MUFFLERS 15Y66 – 2-inch 16A56 – 3-inch

2-Inch – 18-3/4 (476) 3-Inch – 25 (635)

(Installed Vertically

4-1/2

in the Exhaust Pipe)

(114)

NOTE – Two-inch mufflers

do not have reducers

at each end.

EL297DFV / Page 16

DIMENSIONS
CONCENTRIC WALL TERMINATION APPLICATIONS

OPTIONAL ACCESSORIES – VENTING
CONCENTRIC ROOF TERMINATION APPLICATIONS

EXHAUST AIR
INTAKE AIR

OUTSIDE WALL
CLAMP (Not Furnished)

INTAKE AIR EXHAUST AIR

12 (305)
Minimum Above Average
Snow Accumulation

INTAKE AIR

12 (305)
Minimum Above Grade or Average Snow
Accumulation

GRADE

CLAMP

FLASHING (Not Furnished)
SHEET METAL STRAP
(Clamp and sheet metal strap must be field installed to support the weight of the termination kit.)

71M80 / 69M29 / 44W92 – 2 inch kits 60L46 / 44W93 – 3 inch kits
See Installation Instructions for additional information.

Note – Field provided reducer may be required to adapt different vent pipe sizes to termination.

Cat. No.

A

B

6-1/2 (165)

6 (152)

71M80 69M29
44W92 (Canada)

3-1/2 (89) – 2 in. kits 4-1/2 (114) – 3 in. kits
INTAKE AIR

EXHAUST AIR

60L46
44W93 (Canada)

ELBOW (Field Supplied)

TERMINATION ASSEMBLY (Furnished)

Outdoor Exhaust Accelerator included with 71M80/44W92

A in. mm
33-3/8 848

29

737

38-7/8 987

36-1/8 918

B in. mm 16-3/4 425
15-1/2 394
21-3/16 538
19-1/2 495

NOTE – Typical illustration for dimensions only. Design may vary depending on kit ordered.

EL297DFV / Page 17

DIMENSIONS

OPTIONAL ACCESSORIES – VENTING

WALL TERMINATION KITS (CLOSE-COUPLE) EXTENDED VENT FOR GRADE CLEARANCE
2 inch (51 mm) 22G44 (US) 3 inch (76 mm) 44J40 (US) See Installation Instructions for additional information.
Note – Field provided reducer may be required to adapt different vent pipe sizes to termination.
If Intake and Exhaust Pipe is less than12 in. (305 mm) above snow accumulation or other obstructions, field fabricated piping must be installed.

WALL SUPPORT

8 (203) MIN. Between Ends of Exhaust and Intake Pipe 12 (305) MAX. for 2 (51) Dia. Exhaust 20 (508) MAX. for 3 (76) Dia. Exhaust

6 (152) Maximum
INTAKE AIR

8 (203) MIN.

EXHAUST AIR
INTAKE AIR
5 (127)
12 (305) Minimum Above Grade or Average
Snow Accumulation
GRADE

12 (305)
5-1/2 (140)

1/2 (13) FOAM INSULATION
(Field Furnished)
EXHAUST AIR
12 (305) Minimum Above Grade or Average
Snow Accumulation
GRADE

12 (305) MAX. for 2 (51) Dia. Exhaust 20 (508) MAX. for 3 (76) Dia. Exhaust

WALL TERMINATION KITS (CLOSE-COUPLE) EXTENDED VENT FOR GRADE CLEARANCE
2 inch (51 mm) 30G28 (WTK Canada) 3 inch (76 mm) 81J20 (WTK Canada) See Installation Instructions for additional information.
Note – Field provided reducer may be required to adapt different vent pipe sizes to termination.
If Intake and Exhaust Pipe is less than 12 in. (305 mm) above snow accumulation or other obstructions, field fabricated piping must be installed.

WALL SUPPORT
6 (152) Maximum
INTAKE AIR

12 (305) MAX. for 2 (51) Dia. Exhaust 20 (508) MAX. for 3 (76) Dia. Exhaust

6 (152) MIN.

EXHAUST AIR

INTAKE AIR

5 (127)

6 (152) MIN.

12 (305) Minimum Above Grade or Average
Snow Accumulation
GRADE

12 (305) MAX. for 2 (51) Dia. Exhaust 20 (508) MAX. for 3 (76) Dia. Exhaust

12 (305)
5-1/2 (140)

1/2 (13) FOAM INSULATION
(Field Furnished)
EXHAUST AIR
12 (305) Minimum Above Grade or Average
Snow Accumulation
GRADE

EL297DFV / Page 18

DIMENSIONS

Furnace Width

FURNACE/COIL COMBINED DIMENSIONS

33 (838)
Overall Height
Coil Height

Model Number

Coil Width
in. mm

Furnace Width
in. mm

Coil Height
in. mm

Overall Height
in. mm

CRX35-24B-F 17-1/2 445 17-1/2 445 18 457 51 1295

CRX35-30/36B-F 17-1/2 445 17-1/2 445 23-1/2 597 56-1/2 1435

CRX35-30/36C-F 21 533 21 533 23-1/2 597 56-1/2 1435

CRX35-42B-F 17-1/2 445 17-1/2 445 23-1/2 597 56-1/2 1435

CRX35-48C-F

21 533 21 533 27-1/2 699 60-1/2 1537

CRX35-50/60C-F 21 533 21 533 27-1/2 699 60-1/2 1537

Coil Width

EL297DFV / Page 19

BLOWER DATA

EL297DF045XV36B BLOWER PERFORMANCE (less filter) BOTTOM RETURN AIR 0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range

HEATING

1 Heating Speed DIP Switch Settings

First Stage Heating Speed – cfm

Second Stage Heating Speed – cfm

+24%

910

1150

+18%

855

1095

+12%

820

1040

+6%

770

990

Factory Default

745

935

6%

700

880

12%

665

820

18%

635

755

COOLING

1 Cooling Speed DIP Switch Settings

First Stage Cooling Speed – cfm Low Medium-Low Medium-High 2 High

Second Stage Cooling Speed – cfm Low Medium-Low Medium-High 2 High

640

755

850

975

895

1050

1210

1360

Factory Default

580

695

780

880

805

965

1105

1250

545

645

720

795

735

865

1000

1130

1 Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specific DIP Switch Settings. 2 Factory default setting.
NOTES – The effect of static pressure is included in air volumes shown. First stage HEAT is approximately 91% of the same second stage HEAT. First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28% and 38% of the selected second stage cooling speed – minimum 250 cfm. Lennox® Smart Zoning System Applications – Minimum blower speed is 250 cfm.

EL297DF045XV36B BLOWER MOTOR WATTS (COOLING)

1 Cooling Speed

Motor Watts @ Various External Static Pressures – in. wg.

DIP Switch

First Stage

Second Stage

Settings

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

+ Setting

Low 28 44 60 77 93 112 128 144 158 59 77 97 121 138 160 182 197 216 241 256

Cooling Med-low 47 67 88 105 121 138 161 179 201 131 154 177 202 228 250 277 299 320 344 370 Speed Med-High 69 91 113 132 160 183 204 220 246 199 215 248 275 308 340 360 390 407 431 445

High 100 117 153 172 192 215 240 260 286 292 313 363 379 419 452 488 511 526 523 524

Factory Default

Low 17 34 52 65 82 97 121 132 148 61 79 98 125 141 164 185 201 219 246 259

Cooling Med-low 35 50 70 85 105 125 140 155 175 99 115 148 167 188 211 236 256 279 303 317 Speed Med-High 54 72 95 113 131 148 173 189 210 147 170 197 223 252 278 301 330 355 373 398

High 74 96 118 141 168 190 212 233 252 216 229 258 303 325 356 390 410 426 448 465

Setting

Low 17 31 49 61 75 91 107 123 136 46 64 82 101 115 134 155 174 196 205 221

Cooling Med-low 28 45 61 77 93 112 129 144 159 72 92 114 133 160 184 204 221 247 263 282 Speed Med-High 40 57 77 93 112 130 148 165 186 112 130 161 183 205 226 252 272 294 319 341

High 57 76 97 119 136 156 179 195 214 155 174 207 235 265 292 311 343 370 386 414

EL297DFV / Page 20

BLOWER DATA

EL297DF070XV48B BLOWER PERFORMANCE (less filter) BOTTOM RETURN AIR 0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range

HEATING

1 Heating Speed DIP Switch Settings

First Stage Heating Speed – cfm

Second Stage Heating Speed – cfm

+24%

1085

1635

+18%

1030

1525

+12%

950

1450

+6%

910

1365

Factory Default

850

1310

6%

790

1225

12%

740

1135

18%

680

1060

COOLING

1 Cooling Speed DIP Switch Settings

First Stage Cooling Speed – cfm Low Medium-Low Medium-High 2 High

Second Stage Cooling Speed – cfm Low Medium-Low Medium-High 2 High

740

915

1055

1255

1110

1340

1575

1800

Factory Default

660

820

940

1120

995

1230

1420

1650

575

735

850

995

880

1085

1290

1460

1 Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specific DIP Switch Settings. 2 Factory default setting.
NOTES – The effect of static pressure is included in air volumes shown. First stage HEAT is approximately 91% of the same second stage HEAT. First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28% and 38% of the selected second stage cooling speed – minimum 380 cfm. Lennox® Smart Zoning System Applications – Minimum blower speed is 380 cfm.

EL297DF070XV48B BLOWER MOTOR WATTS (COOLING)

1 Cooling Speed

Motor Watts @ Various External Static Pressures – in. wg.

DIP Switch

First Stage

Second Stage

Settings

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

+ Setting

Low 68 88 109 132 154 178 199 213 238 144 169 208 244 270 310 343 378 401 432 457

Cooling Med-low 93 120 147 172 198 220 254 274 304 257 276 326 370 398 437 470 492 531 558 598 Speed Med-High 120 152 180 220 254 281 318 344 380 390 428 472 526 574 611 659 706 745 788 820

High 214 237 284 324 352 390 424 456 474 627 604 663 721 775 825 869 908 915 881 864

Factory Default

Low 35 54 74 92 109 129 147 163 191 104 137 162 189 219 254 278 312 341 369 400

Cooling Med-low 75 100 115 140 165 190 210 230 255 188 203 250 297 327 374 399 432 454 486 513 Speed Med-High 99 129 159 179 209 236 270 293 329 304 340 376 418 450 495 533 567 613 637 674

High 157 184 232 264 285 335 365 406 419 454 469 537 589 634 669 724 770 818 833 840

Setting

Low 27 49 63 73 98 116 135 155 168 86 111 135 162 186 206 236 257 283 306 339

Cooling Med-low 67 87 109 132 154 177 199 212 238 129 156 187 226 258 288 325 353 385 409 441 Speed Med-High 82 105 127 153 176 196 223 243 269 226 244 290 335 364 402 435 465 485 516 556

High 107 141 164 195 224 263 282 321 347 329 375 403 444 481 526 570 612 656 680 718

EL297DFV / Page 21

BLOWER DATA

EL297DF090XV60C BLOWER PERFORMANCE (less filter) BOTTOM RETURN AIR 0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range

HEATING

1 Heating Speed DIP Switch Settings

First Stage Heating Speed – cfm

Second Stage Heating Speed – cfm

+24%

1425

1895

+18%

1355

1825

+12%

1280

1740

+6%

1215

1660

Factory Default

1160

1575

6%

1055

1455

12%

1010

1365

18%

950

1265

COOLING

1 Cooling Speed DIP Switch Settings

First Stage Cooling Speed – cfm Low Medium-Low Medium-High 2 High

Second Stage Cooling Speed – cfm Low Medium-Low Medium-High 2 High

1115

1265

1400

1600

1750

1970

2130

Factory Default 1005

1150

1275

1450

1630

1810

1975

890

1065

1150

1270

1450

1645

1810

1 Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specific DIP Switch Settings. 2 Factory default setting.
NOTES – The effect of static pressure is included in air volumes shown. First stage HEAT is approximately 91% of the same second stage HEAT. First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28% and 38% of the selected second stage cooling speed – minimum 450 cfm. Lennox® Smart Zoning System Applications – Minimum blower speed is 450 cfm.

EL297DF090XV60C BLOWER MOTOR WATTS (COOLING)

1 Cooling Speed

Motor Watts @ Various External Static Pressures – in. wg.

DIP Switch

First Stage

Second Stage

Settings

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

+ Setting

Low 79 108 144 162 207 242 262 293 323 275 299 366 399 449 483 532 584 605 644 680

Cooling Med-low 120 156 187 233 261 279 329 368 401 387 409 471 521 562 606 650 688 716 762 800 Speed Med-High 155 202 235 293 317 369 407 453 502 547 577 622 667 744 795 835 872 910 950 963

High 268 299 366 399 449 483 532 584 605 780 775 811 898 942 994 1048 1071 1082 1080 1073

Factory Default

Low 56 86 111 140 170 200 232 259 282 186 219 270 308 361 390 431 489 517 555 590

Cooling Med-low 93 118 152 195 223 254 283 306 344 278 304 365 420 450 510 544 592 640 665 698 Speed Med-High 123 161 201 228 260 310 341 381 416 446 475 528 582 616 662 686 747 780 823 855

High 182 219 270 308 361 390 431 489 517 576 603 654 704 756 809 871 902 939 972 975

Setting

Low 48 69 101 120 152 175 201 218 249 118 155 181 232 259 299 340 376 402 438 476

Cooling Med-low 65 94 123 150 185 220 250 278 296 177 205 267 304 353 390 430 486 515 563 587 Speed Med-High 93 118 152 195 223 254 283 306 344 301 322 392 439 468 531 568 599 647 678 721

High 116 155 181 232 259 299 340 376 402 446 475 528 582 616 662 686 747 780 823 855

EL297DFV / Page 22

BLOWER DATA

EL297DF110XV60C BLOWER PERFORMANCE (less filter) BOTTOM RETURN AIR 0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range

HEATING

1 Heating Speed DIP Switch Settings

First Stage Heating Speed – cfm

Second Stage Heating Speed – cfm

+24%

1535

2015

+18%

1445

1935

+12%

1370

1855

+6%

1300

1760

Factory Default

1220

1645

6%

1135

1545

12%

1070

1420

18%

1000

1335

COOLING

1 Cooling Speed DIP Switch Settings

First Stage Cooling Speed – cfm Low Medium-Low Medium-High 2 High

Second Stage Cooling Speed – cfm Low Medium-Low Medium-High 2 High

1095

1265

1395

1585

1790

1990

2180

Factory Default

965

1130

1285

1440

1630

1845

2005

860

1035

1130

1275

1475

1655

1845

1 Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specific DIP Switch Settings. 2 Factory default setting.
NOTES – The effect of static pressure is included in air volumes shown. First stage HEAT is approximately 91% of the same second stage HEAT. First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28% and 38% of the selected second stage cooling speed – minimum 450 cfm. Lennox® Smart Zoning System Applications – Minimum blower speed is 450 cfm.

EL297DF110XV60C BLOWER MOTOR WATTS (COOLING)

1 Cooling Speed

Motor Watts @ Various External Static Pressures – in. wg.

DIP Switch

First Stage

Second Stage

Settings

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

+ Setting

Low 71 99 147 166 202 240 271 302 337 248 280 333 374 429 469 511 548 594 619 677

Cooling Med-low 127 159 198 225 256 301 325 365 390 409 427 496 531 587 632 665 721 742 781 805 Speed Med-High 162 204 242 287 316 371 408 446 487 563 589 651 703 755 808 860 888 932 970 1007

High 243 280 333 374 429 469 511 548 594 866 850 915 963 1020 1056 1091 1127 1141 1136 1131

Factory Default

Low 57 88 117 140 165 196 232 259 283 167 214 244 291 331 380 405 467 497 539 583

Cooling Med-low 77 112 147 172 209 250 283 317 345 275 321 348 418 447 505 546 597 632 668 716 Speed Med-High 122 154 199 230 268 300 331 373 411 461 493 547 572 628 666 703 745 777 819 860

High 167 214 244 291 331 380 405 467 497 601 626 688 730 787 823 880 924 963 994 1011

Setting

Low 44 67 99 115 144 167 197 215 245 126 165 201 232 262 305 334 373 417 451 479

Cooling Med-low 66 97 123 153 186 216 247 275 303 187 219 272 308 360 391 432 479 514 559 588 Speed Med-High 77 112 147 172 209 250 283 317 345 308 341 390 430 490 528 569 617 640 691 724

High 127 165 201 232 262 305 334 373 417 461 493 547 572 628 666 703 745 777 819 860

EL297DFV / Page 23

REVISIONS
Sections Electrical data

Description of Change Updated maximum overcurrent protection for EL297DF070XV48B (changed to 15 amps)

Visit us at www.Lennox.com For the latest technical information, www.LennoxPros.com Contact us at 1-800-9-LENNOX

NOTE – Due to Lennox’ ongoing commitment to quality, Specifications, Ratings and Dimensions subject to change without notice and without incurring liability.

Improper installation, adjustment, alteration, service or maintenance can cause property damage or personal injury.

Installation and service must be performed by a qualified installer and servicing agency.