Lennox ELITE EL296DFE Installation Instructions Manual
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Lennox ELITE EL296DFE Installation Instructions Manual

Lennox ELITE EL296DFE Installation Instructions Manual

Gas furnace downflow air discharge
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© 2022 Lennox Industries Inc.
Dallas, Texas USA
Contents
Unit Dimensions - inches (mm) ......................................2
EL296DFE Gas Furnace ................................................3
Shipping and Packing List ..............................................3
Safety .............................................................................3
General ...........................................................................5
Combustion, Dilution, Ventilation Air...............................5
Setting Equipment ..........................................................8
Filters ............................................................................12
Duct System .................................................................12
Pipe Fittings Specifications...........................................12
Venting Options ............................................................13
Joint Cementing Procedure ..........................................16
Venting Practices ..........................................................16
INSTALLATION
INSTRUCTIONS
EL296DFE
ELITE
SEREIS GAS FURNACE
®
DOWNFLOW AIR DISCHARGE
507069-05
04/2022
Supersedes 10/2021
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.
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.
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.
Vent Pipe Guidleines ....................................................18
Gas Piping ....................................................................35
Electrical .......................................................................37
Integrated Control .........................................................39
Unit Start-Up .................................................................48
Gas Pressure Measurement.........................................49
Proper Combustion.......................................................50
High Altitude .................................................................50
Other Unit Adjustments.................................................52
Sequence of Operation.................................................52
Service..........................................................................53
Star-Up and Performance Checklist .............................55
Repair Parts List ...........................................................58
Blower Data ..................................................................59
Page 1
WARNING
CAUTION

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Summary of Contents for Lennox ELITE EL296DFE

  • Page 1: Table Of Contents

    INSTALLATION INSTRUCTIONS EL296DFE © 2022 Lennox Industries Inc. Dallas, Texas USA ELITE SEREIS GAS FURNACE ® DOWNFLOW AIR DISCHARGE 507069-05 04/2022 Supersedes 10/2021 THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE This is a safety alert symbol and should never be ignored.

  • Page 2: Unit Dimensions - Inches (Mm)

    Unit Dimensions - inches (mm) 9/16 (14) Flue Condensate Trap Assembly COMBUSTION AIR INTAKE Furnished for external field installation (178) RETURN AIR on either side of unit. OPENING EXHAUST AIR (See installation instructions OUTLET for additional information.) 2-1/16 (52) 2-1/4 9/16 (14) (57)

  • Page 3: El296Dfe Gas Furnace

    EL296DFE Gas Furnace Shipping and Packing List Package 1 of 1 contains The EL296DFE Category IV gas furnace is shipped ready for installation in the downflow position. 1 - Assembled EL296DFE unit The furnace is equipped for installation in natural gas 1 - Bag assembly containing the following: applications.

  • Page 4: Use Of Furnace As A Construction Heaterl

    Building Codes In Canada, all electrical wiring and grounding for the unit must be installed according to the current regulations of In the USA, installation of gas furnaces must conform with the Canadian Electrical Code Part I (CSA Standard C22.1) local building codes.

  • Page 5: General

    FAILURE TO FOLLOW THE ABOVE INSTALLATION IN- Chlorinated waxes and cleaners STRUCTIONS VOIDS THE MANUFACTURER’S EQUIP- Chlorine base swimming pool chemicals MENT LIMITED WARRANTY. LENNOX DISCLAIMS ALL LIABILITY IN CONNECTION WITH INSTALLER’S Water softening chemicals FAILURE TO FOLLOW THE ABOVE INSTALLATION IN- De-icing salts or chemicals STRUCTIONS.
  • Page 6 When the furnace is installed so that supply ducts carry DANGER air circulated by the furnace to areas outside the space containing the furnace, the return air must be handled by Do not install the furnace in a corrosive or contaminated ducts which are sealed to the furnace casing and which atmosphere.
  • Page 7 Air from Outside If air from outside is brought in for combustion and ventila- EQUIPMENT IN CONFINED SPACE (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside) tion, the confined space shall be provided with two perma- nent openings. One opening shall be within 12” (305mm) of the top of the enclosure and one within 12”...

  • Page 8: Setting Equipment

    Installation - Setting Equipment EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE WARNING ROOF TERMINATED Do not install the furnace on its front, back or in the EXHAUST PIPE horizontal position. See FIGURE 12. Do not connect the return air ducts to the back of the furnace. Doing so OUTLET AIR will adversely affect the operation of the safety control devices, which could result in personal injury or death.
  • Page 9 Front Back Horizontal NOTE - Do not install the furnace on its front, back or in the horizontal position FIGURE 12 WARNING Improper installation of the furnace can result in personal injury or death. Combustion and flue products must never be allowed to enter the return air system or air in the living space.
  • Page 10 The unit may be installed three ways in downflow applica- TABLE 1 tions: on non-combustible flooring, on combustible floor- NON-COMBUSTIBLE FLOOR OPENING SIZE ing using an additive base, or on a reverse-flow cooling coil cabinet. Do not drag the unit across the floor in the Front to Rear Side to Side Cabinet...
  • Page 11 FURNACE FURNACE SUPPLY AIR PLENUM PROPERLY COMBUSTIBLE SIZED FLOOR FLOORING BASE COOLING COIL OPENING PROPERLY SIZED FLOOR OPENING PLENUM FIGURE 15 TABLE 2 FIGURE 16 COMBUSTIBLE FLOORING BASE OPENING SIZE Return Air Opening -- Downflow Units Front to Rear Side to Side Cabinet Catalog Return air may be brought in only through the top opening...

  • Page 12: Filters

    Lennox Product bustion and the formation of carbon monoxide gas. This Specifications bulletin. Additional information is provided...

  • Page 13: Venting Options

    Use PVC primer and solvent cement or ABS solvent ce- TABLE 4 ment meeting ASTM specifications, refer to TABLE 4. As PIPING AND FITTINGS SPECIFICATIONS an alternate, use all purpose cement, to bond ABS, PVC, or CPVC pipe when using fittings and pipe made of the Schedule 40 PVC (Pipe) D1785 same materials.
  • Page 14 Failure to use gaskets and plates may lead to improper Lennox provides kit 51W18 (USA) and kit 15Z70 (Cana- operation of unit. da) to install 2” or 3” PVC exhaust piping through the floor joists and into the the crawl space.
  • Page 15 Right Side Vent Configuration Side Vent Sealing Plate Side Vent Sealing Gaskets Exhaust Intake Street Elbows (2) FIGURE 23 TABLE 5 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Flush Mount Wall Kit 1-1/2 inch 2 inch 3 inch Vent Pipe Input Size 2 inch 3 inch Field...

  • Page 16: Joint Cementing Procedure

    Joint Cementing Procedure Venting Practices All cementing of joints should be done according to the specifications outlined in ASTM D 2855. Piping Suspension Guidelines NOTE - A sheet metal screw may be used to secure the intake pipe to the connector, if desired. Use a drill or self SCHEDULE 40 tapping screw to make a pilot hole.
  • Page 17 2 - When furnace is installed in a residence where unit 4 - Follow the lighting instructions. Turn on the appliance is shut down for an extended period of time, such that is being inspected. Adjust the thermostat so that as a vacation home, make provisions for draining the appliance operates continuously.

  • Page 18: Vent Pipe Guidleines

    Do not use screens or perforated metal in exhaust or intake terminations. Doing so will cause freeze-ups and NOTE - Lennox offers a glueless vent adapter kit 17H92 may block the terminations. as an option for exhaust exiting at the furnace top cap coupling.
  • Page 19 TABLE 7 Maximum Allowable Intake or Exhaust Vent Length Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Intake and Exhaust must be same size. NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation. Standard Termination at Elevation 0 - 4500 ft Number 1-1/2”...
  • Page 20 TABLE 7 Continued Maximum Allowable Intake or Exhaust Vent Length Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Intake and Exhaust must be same size. NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation. Concentric Termination at Elevation 0 - 4500 ft Number 1-1/2”...
  • Page 21 TYPICAL EXHAUST PIPE CONNECTIONS 045/070 Only 2” 1−1/2” 2” 2” 2” TRANSITION 2” 2” Exhaust Exhaust 3” DO NOT transition from larger to smaller pipe in horizontal runs TRANSITION of exhaust pipe. INTAKE EXHAUST DO NOT transition from smaller *2” to larger pipe size in horizontal TOP VIEW runs of exhaust pipe.
  • Page 22 TYPICAL EXHAUST CONNECTIONS WITH RIGHT SIDE VENT OPTION Pipe Length 4” Maximum (Not Furnished) 3” 2” 2” TRANSITION *2” 2” Plate (Furnished) Street Ell (Not Furnished) TOP VIEW * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. NOTE Intake pipe and exhaust pipe must be the same diameter.
  • Page 23 Intake Piping EQUIPMENT IN CONFINED SPACE The EL296DFE furnace may be installed in either direct (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside) vent or non-direct vent applications. In non-direct vent applications, when intake air will be drawn into the furnace Roof Terminated from the surrounding space, the indoor air quality must be Exhaust Pipe...
  • Page 24 In both Non-Direct Vent and Direct Vent applications, the vent termination is limited by local building codes. In the TYPICAL AIR INTAKE PIPE CONNECTIONS absence of local codes, refer to the current National Fuel NON−DIRECT VENT APPLICATIONS Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current CSA-B149 Natural Gas and Propane Installation Codes in INTAKE SCREEN...
  • Page 25 TABLE 9 Maximum Allowable Exhaust Vent Pipe Length (in ft. ) Without Insulation In Unconditioned Space For Winter Design Temperatures Two - Stage High Efficiency Furnace Vent Pipe Unit Input Size Winter Design Temperatures1 °F (°C) Diameter 1-1/2 in 32 to 21 2 in (0 to -6) 2-1/2 in...
  • Page 26 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 35...
  • Page 27 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 36 Page 27...
  • Page 28 Details of Intake and Exhaust Piping Terminations for 6 - On field supplied terminations, a minimum distance Direct Vent Installations between the end of the exhaust pipe and the end of the intake pipe without a termination elbow is 8” and NOTE - In Direct Vent installations, combustion air is taken a minimum distance of 6”...
  • Page 29 7 - If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported. At least 12” EXHAUST one bracket must be used within 6” from the top of (305mm) VENT 5-1/2”...
  • Page 30 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT Vent Pipe Vent Pipe LARGER VENT PIPE SIZE TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
  • Page 31 Details of Exhaust Piping Terminations for Non-Direct Vent Applications 12” (305mm) ABOVE AVE. Exhaust pipes may be routed either horizontally through SNOW an outside wall or vertically through the roof. In attic or ACCUMULATION closet installations, vertical termination through the roof is preferred.
  • Page 32 If this is not possible, a heat cable kit may be used on the condensate trap and line. Heat cable kit is avail- able from Lennox in various lengths; 6 ft. (1.8m) - kit to drain no. 26K68 and 24 ft. (7.3m) - kit no. 26K69.
  • Page 33 Condensate Trap With Optional Overflow Switch Furnace with Evaporator Coil Using a Separate Drain From Evaporator Coil HorizontalFurnace4” Min. to 5” Max.above condensatedrain connection) Field Provided Vent 1” min. 2” max. above condensate drain. FurnaceCondensate Condensate DrainConnection Drain Connection Optional Evaporator Drain Line (vent required) Drain...
  • Page 34 TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC Optional Condensate Drain Connection Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) 90° Street Elbow 3/4 inch PVC (not furnished) Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) Condensate Drain Connection In Unit 1 (25 mm) Min.

  • Page 35: Gas Piping

    IMPORTANT Gas Piping CAUTION Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petroleum gases. If a flexible gas connector is required or allowed by the authority that has jurisdiction, black iron pipe shall be Leak Check installed at the gas valve and extend outside the furnace After gas piping is completed, carefully check all field-in-...
  • Page 36 Left Side Piping AUTOMATIC MANUAL (Standard) GAS VALVE MAIN SHUT-OFF MANUAL (with manual VALVE AUTOMATIC MAIN SHUT-OFF shut-off valve) (1/8 in. NPT GAS VALVE VALVE plugged tap (with manual (1/8 in. NPT shown) shut-off valve) plugged tap shown) GROUND JOINT UNION GROUND JOINT...

  • Page 37: Electrical

    Refer to FIGURE 60 or FIGURE 61 and TABLE 15 Electrical EL296 Field Wiring Applications With Conventional Ther- mostat. WARNING The power supply wiring must meet Class I restrictions. Protected by either a fuse or circuit breaker, select circuit Electric Shock Hazard. Can cause injury or protection and wire size according to unit nameplate.
  • Page 38 Indoor Blower Speeds On-Board Link W914 Dehum 1 - When the thermostat is set to “FAN ON,” the indoor On-board link W914, is a clippable connection between blower will run continuously on the field selectable terminals R and DS on the integrated control. W914 must fan speed (“LOW HEAT”...

  • Page 39: Integrated Control

    Integrated Control 103699-XX 24VAC Indoor Ignitor and Combustion Blower Terminals Air Inducer Neutrals Flame Sense S4 DIP Switches Diagnostic Push Button On Board Links 3/16” QUICK CONNECT TERMINALS THERMOSTAT CONNECTIONS (TB1) DS = DEHUMIDIFICATION SIGNAL FLAME SENSE SIGNAL W2 = HEAT DEMAND FROM 2ND STAGE T/STAT HI Cool 24VAC W1 = HEAT DEMAND FROM 1ST STAGE T/STAT HI HEAT 24VAC...
  • Page 40 Integrated Control 107048-XX UTEC TWO-STAGE CONSTANT TORQUE INTEGRATED FURNACE CONTROL Line Voltage Ignitor and Combustion Accessories Air Inducer Humidifier Neutrals ECM DRIVE - 24VAC Line Voltage Flame Sense On Board Links Thermostat Connections 3/16” QUICK CONNECT TERMINALS THERMOSTAT CONNECTIONS HI COOL (24VAC) DS= Dehumidification signal LO COOL (24VAC) W2= Heat demand from 2...
  • Page 41 The blower off delay affects comfort and is adjustable to Integrated Control DIP Switch Settings satisfy individual applications. Adjust the blower off de- EL296DFE units are equipped with a two-stage integrat- lay to achieve a supply air temperature between 90° and ed control.
  • Page 42 TABLE 15 EL296 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 1 Heat / 1 Cool FURNACE OUTDOOR T'STAT TERM.
  • Page 43 TABLE 15 EL296 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 2 Heat / 2 Cool FURNACE OUTDOOR T'STAT TERM.
  • Page 44 TABLE 15 EL296 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP T'STAT TERM.
  • Page 45 TABLE 15 EL296 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP T'STAT TERM.
  • Page 46 Wiring Diagram With Integrated Control 103699-XX FIGURE 60 Page 46...
  • Page 47 (2) S47 (1) S47 SEE BLOWER SPEED CHART VALVE P159 J159 120V J159 P159 WHT/BLK BLACK INDOOR BLOWER GN/YLW LENNOX HEATING UNITS−GAS MOTOR INTEGRATED EL296DF045XE36B EL296DF090XE48C CONTROL EL296DF070XE48B EL296DF110XE60C EL296DFXE 2 HEAT 2 COOL WARNING− EQUIPMENT ELECTRIC SHOCK HAZARD,CAN CAUSE INJURY...

  • Page 48: Unit Start-Up

    6 - Adjust the thermostat to deactivate the heating Unit Start-Up demand and wait for the combustion air inducer to FOR YOUR SAFETY READ BEFORE OPERATING stop. At this point, tthe trap should be primed with sufficient water to ensure proper condensate drain WARNING operation.

  • Page 49: Gas Pressure Measurement

    NOTE - Pressure test adapter kit (10L34) is available from 3 - After a 15-second prepurge, the hot surface ignitor Lennox to facilitate manifold pressure measurement. energizes. 1 - Connect the test gauge positive side “+“ to manifold 4 - After a 20-second ignitor warm-up period, the gas valve solenoid opens.

  • Page 50: Proper Combustion

    Proper Combustion High Altitude Information Furnace should operate minimum 15 minutes with correct NOTE - In Canada, certification for installations at eleva- manifold pressure and gas flow rate before checking com- tions over 4500 feet (1372 m) is the jurisdiction of local bustion.
  • Page 51 Testing of Non-Direct Vent Applications for Proper Venting and Sufficient Combustion Air 3 - To the extent that it is practical, close all building WARNING doors and windows and all doors between the space in which the appliances connected to the venting CARBON MONOXIDE POISONING HAZARD! system are located and other spaces of the building.

  • Page 52: Other Unit Adjustments

    Applications Using a Two-Stage Thermostat Other Unit Adjustments A - Heating Sequence -- Integrated Control Thermo- NOTE - See troubleshooting flow charts if any safety stat Selection DIP Switch 1 OFF in “Two-Stage” Posi- switches are found to be open. tion (Factory Setting) Primary Limit 1 - On a call for heat, thermostat first-stage contacts...

  • Page 53: Service

    3 - After the pre-purge is complete, a 20-second initial At the beginning of each heating season, and to comply ignitor warm-up period begins. The combustion air with the Lennox Limited Warranty, your system should inducer continues to operate at low speed. be checked as follows:...
  • Page 54 8- Evaluate the heat exchanger integrity by inspecting Winterizing and Condensate Trap Care the heat exchanger per the AHRI heat exchanger 1 - Turn off power to the furnace. inspection procedure. This procedure can be viewed 2 - Have a shallow pan ready to empty condensate at www.ahrinet.org water.

  • Page 55: Star-Up And Performance Checklist

    Start-Up & Performance Check List UNIT SET UP (typical) Furnace: Model Number_______________ Serial Number_________________ SUPPLY Line Voltage GAS SUPPLY LP Propane Gas Natural Gas Piping Connections Tight Leak Tested Flter Supply Line Pressure “W.C.________ RETURN AIR Gas Supply Pressure DUCT SYSTEM SUPPLY AIR DUCT Sealed INTAKE / EXHAUST PIPE...
  • Page 56 UNIT OPERATION HEATING MODE COOLING MODE GAS MANIFOLD PRESSURE “W.C._____ INDOOR BLOWER AMPS______ COMBUSTION SAMPLE CO CO PPM_______ TEMPERATURE DROP ______ Return Duct Temperature _________ INDOOR BLOWER AMPS______ Supply Duct Temperature _______ Temperature Drop = _________ TEMPERATURE RISE TOTAL EXTERNAL STATIC (dry coil) Supply Duct Temperature ________ Supply External Static _______ Return Duct Temperature...
  • Page 57 Requirements for Commonwealth of Massachusetts 4 - INSPECTION. The state or local gas inspector of the Modifications to NFPA-54, Chapter 10 side wall, horizontally vented, gas-fueled equipment Revise NFPA-54 section 10.8.3 to add the following shall not approve the installation unless, upon requirements: inspection, the inspector observes carbon monoxide For all side wall, horizontally vented, gas-fueled equip-...

  • Page 58: Repair Parts List

    Blower Parts Addendum For All Porvinces Of Canada Blower wheel Motor See below for venting in all provinces of Canada. Lennox approves the following termination for use in all provices Motor mounting frame of Canada. Blower housing cutoff plate 12”...

  • Page 59: Blower Data

    Blower Data EL296DF045XE36B PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External High Medium-High Medium Medium-Low Static (Black) (Brown) (Blue) (Yellow) (Red) Pressure in. w.g. Watts Watts Watts Watts Watts 0.00 1395 1290 1190 0.10 1375 1245 1140 0.20 1320...
  • Page 60 Blower Data EL296DF090XE48C PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External High Medium-High Medium Medium-Low Static (Black) (Brown) (Blue) (Yellow) (Red) Pressure in. w.g. Watts Watts Watts Watts Watts 0.00 1765 1565 1410 1290 1180 0.10 1745 1510 1365...
  • Page 61 TABLE 20 Allowable Heating Speeds EL296DF Low Fire Heating Speeds High Fire Heating Speeds Model Yellow Blue Brown Black Yellow Blue Brown Black Number 045XE36B Allowed 070XE48B Factory Allowed Allowed Allowed Allowed Allowed Allowed Setting Allowed Allowed Allowed 090XE48C 110XE60C Allowed TABLE 21 Allowable Circulation Speeds...

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