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Lennox EL296UHE Installation Instructions Manual

Elite series gas furnace upflow / horizontal air discharge
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See also: User's Information Manual , Instruction and Installation Manual
E 2015 Lennox Industries Inc.
Dallas, Texas, USA
AIR FLOW
HORIZONTAL LEFT
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INSTALLATION
INSTRUCTIONS
EL296UHE
®
ELITE
SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
507280-03
10/2015
Supersedes 07/2015
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 manuals, be alert
to the potential for personal injury or death.
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person­
al injury or loss of life. Installation and service must
be performed by a licensed professional HVAC in­
staller (or equivalent), service agency or the gas sup­
plier.
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
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Summary of Contents for Lennox EL296UHE

  • Page 1: Table Of Contents

    INSTALLATION INSTRUCTIONS E 2015 Lennox Industries Inc. Dallas, Texas, USA EL296UHE ® ELITE SERIES GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE 507280-03 10/2015 Supersedes 07/2015 Litho U.S.A. 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

    EL296UHE Unit Dimensions - inches (mm) EXHAUST AIR 3−1/4 NOTE − 60C and 60D size units that require air OUTLET (83) volumes 1800 cfm or over (850 L/s) must have one of the following 1−7/8 (48) 1. Single side return air with transition, to accommodate 20 x 25 x 1 in.

  • Page 3: El296Uhe Gas Furnace

    1 - Snap bushing zontal or upflow applications with bottom return air. 1 - Snap plug The EL296UHE can be installed as either a Direct Vent 1 - Wire tie or a Non-Direct Vent gas central furnace. 1 - Condensate trap The furnace is equipped for installation in natural gas ap­...

  • Page 4: Use Of Furnace As Construction Heater

    EL296UHE units may be used for heating of buildings or either the heating or the cooling unit, unless it is in the full structures under construction, if the following conditions HEAT or COOL setting.

  • Page 5: General

    Combustion, Dilution & Ventilation Air • When the furnace is installed in non-direct vent applica­ If the EL296UHE is installed as a Non-Direct Vent Fur­ tions, do not install the furnace where drafts might blow nace, follow the guidelines in this section.
  • Page 6 ing. A portion of this information has been reprinted with Confined Space permission from the National Fuel Gas Code (ANSI- A confined space is an area with a volume less than 50 cu­ Z223.1/NFPA 54). This reprinted material is not the com­ bic feet (1.42 m ) per 1,000 Btu (.29 kW) per hour of the plete and official position of the ANSI on the referenced...
  • Page 7 Air from Outside EQUIPMENT IN CONFINED SPACE If air from outside is brought in for combustion and ventila­ (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

    Upflow Applications The EL296UHE gas furnace can be installed as shipped in the upflow position. Refer to figure 12 for clearances. Se­ Shipping Bolt Removal lect a location that allows for the required clearances that Units with 1/2 hp blower motor are equipped with three flex­...
  • Page 9 Fire, explo­ EL296UHE applications which include side return air sion, carbon monoxide poisoning, personal injury and a condensate trap installed on the same side of the and/or property damage could result.
  • Page 10 Optional Return Air Base (Upflow Applications Only) FURNACE FRONT 23 (584) IF BASE 3−1/4 IS USED Overall (83) (Maximum) Minimum WITHOUT 11 (279) IAQ CABINET, INDOOR AIR A SINGLE Maximum 22−7/16 QUALITY RETURN AIR Unit side return air 14 (356) (570) CABINET PLENUM...
  • Page 11 The EL296UHE furnace can be installed in horizontal ap­ HORIZONTAL SUSPENSION KIT plications with either right- or left-hand air discharge. Refer to figure 17 for clearances in horizontal applications. Internal Brace Metal Strap (provided with kit) (typical) Horizontal Application Installation Clearances...

  • Page 12: Filters

    Before using any filter with this system, check the to fit the filter frame. specifications provided by the filter manufacturer against the data given in the appropriate Lennox Pipe & Fittings Specifications Product Specifications bulletin. Additional informa­ tion is provided in Service and Application Note All pipe, fittings, primer and solvent cement must conform ACC­00­2 (August 2000).

  • Page 13: Joint Cementing Procedure

    IMPORTANT plied lightly but uniformly to inside of socket. Take care to keep excess cement out of socket. Apply second EL296UHE exhaust and intake connections are coat to end of pipe. made of PVC. Use PVC primer and solvent cement 7 - Immediately after applying last coat of cement to pipe, when using PVC vent pipe.

  • Page 14: Venting Practices

    8 - After assembly, wipe excess cement from pipe at end Conduct the following test while each appliance is operat­ of fitting socket. A properly made joint will show a bead ing and the other appliances (which are not operating) re­ around its entire perimeter.

  • Page 15: Vent Piping Guidelines

    7. (To Adjacent Room) The EL296UHE can be installed as either a Non-Direct Vent or a Direct Vent gas central furnace. NOTE - In Non‐Direct Vent installations, combustion air is taken from indoors or ventilated attic or crawlspace and flue gases are discharged outdoors.
  • Page 16 Which needs FIGURE 22 most elbows? TABLE 3 Intake or MINIMUM VENT PIPE LENGTHS exhaust? EL296UHE MIN. VENT LENGTH* MODEL 15 ft. or How many elbows? 045, 070, 090, 110, 135 5 ft. plus 2 elbows or Count all elbows inside 10 ft.

  • Page 17: Outdoor Termination Usage

    TABLE 4 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Wall Kit Wall Ring Kit FlushMount 1-1/2 inch 2 inch 3 inch Vent 2 inch 3 inch 2 inch Pipe Input Size Field 71M80 69M29 Dia. in. Fabricated 51W11 (US) 22G44 (US) 44J40 (US) (US) (US) 60L46 (US)
  • Page 18 TABLE 5 Maximum Allowable Intake or Exhaust Vent Length in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe 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.
  • Page 19 TABLE 5 Continued Maximum Allowable Intake or Exhaust Vent Length in Feet Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size. Concentric Termination at Elevation 0 - 4500 ft 2”...
  • Page 20 TABLE 6 Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl Space For Intake Air in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.
  • Page 21 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS EXHAUST INTAKE EXHAUST INTAKE 2” 2” 2” 2” 3” 3” TRANSITION TRANSITION 2” 2” *2” *2” DO NOT transition from smaller to larger pipe in horizontal runs of exhaust pipe.
  • Page 22 Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS The EL296UHE furnace may be installed in either direct HORIZONTAL NON−DIRECT VENT APPLICATIONS (Horizontal Right−Hand Air Discharge Application Shown) vent or non-direct vent applications. In non-direct vent applications, when intake air will be drawn into the furnace...
  • Page 23 The EL296UHE is then classified as a direct vent, all gas appliances serviced by this space. Category IV gas furnace.
  • Page 24 TABLE 7 Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For Winter Design Temperatures Unit Input Size Winter Design Vent Pipe Temperatures °F (°C) Diameter 2 in. 32 to 21 (0 to -6) 2-1/2 in. 3 in.

  • Page 25: Vent Termination Clearances

    ‡ 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 31...
  • 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 32 Page 26...
  • Page 27 2” (51MM) 2” (51MM) used and the flue gasses may impinge on the building ma­ *EL296UHE-045, -070 and -090 units with the flush mount termination terial, a corrosion-resistant shield (minimum 24 inches must use the 1-1/2”accelerator supplied with the kit.
  • Page 28 INSTALLATION OF DIRECT VENT WALL TERMINATION KIT (30G28 or 81J20) FIGURE 39 1 1/2” (38mm) accelerator provided on 71M80 & 44W92 EXHAUST kits for EL296UH045E36B, & EL296UHE DIRECT VENT APPLICATION VENT 070E36B USING EXISTING CHIMNEY FLASHING 12” (305mm) INTAKE STRAIGHT-CUT OR...
  • Page 29 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT LARGER VENT PIPE SIZE Vent Pipe Vent Pipe TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
  • Page 30 Details of Exhaust Piping Terminations for Non‐Direct EL296UHE NON-DIRECT VENT APPLICATION Vent Applications USING EXISTING CHIMNEY Exhaust pipes may be routed either horizontally through an SIZE TERMINATION STRAIGHT-CUT OR outside wall or vertically through the roof. In attic or closet ANGLE-CUT IN DIRECTION PIPE PER TABLE 8.
  • Page 31 Heating cable kit is avoid interference. available from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68 and 24 ft. (7.3m) - kit no. 26K69. FIGURE 44...
  • Page 32 FurnaceCondensate Drain Connection Condensate Optional Drain Connection FIGURE 48 FIGURE 47 EL296UHE with Evaporator Coil Using a Separate Drain (Unit shown in horizontal left-hand discharge position) Field Provided Vent Evaporator (4” min. to 5” max. above Coil condensate connection) 4”min 5”max...
  • Page 33 (1” min. to 2” Max.above condensate drain connection) Condensate Drain Connection FIGURE 50 EL296UHE with Evaporator Coil Using a Common Drain (Unit shown in horizontal left−hand discharge position) (4” min. to 5” Max.above Evaporator condensate drain connection) Coil 4”min 5”max...
  • 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

    6 - In some localities, codes may require installation of a Gas Piping manual main shut‐off valve and union (furnished by in­ Gas supply piping should not allow more than 0.5”W.C. staller) external to the unit. Union must be of the drop in pressure between gas meter and unit.
  • Page 36 Left Side Piping Right Side Piping (Standard) (Alternate) MANUAL MAIN SHUT-OFF MANUAL VALVE MAIN SHUT-OFF VALVE GROUND GROUND JOINT JOINT UNION UNION DRIP LEG Gas Valve Gas Valve DRIP LEG FIELD PROVIDED AND INSTALLED NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET FIGURE 54 Horizontal Applications Possible Gas Piping Configurations...

  • Page 37: Electrical

    TABLE 9 GAS PIPE CAPACITY - FT /HR (kL/HR) Nominal Length of Pipe - feet (m) Internal Iron Pipe Diameter Size inches inches (mm) (3.048) (6.096) (9.144) (12.192) (15.240) (18.288) (21.336) (24.384) (27.432) (30.480) (mm) .622 (12.7) (17.799) (4.87) (3.34) (2.69) (2.29) (2.03)
  • Page 38 Diagnostic Push Button 2 - When the EL296UHE is running in the heating mode, The diagnostic push button is located adjacent to the the indoor blower will run on the 'LOW HEAT” or “HIGH seven-segment diagnostic LED.
  • Page 39 TYPICAL EL296UHE WIRING DIAGRAM FIGURE 57 Page 39...

  • Page 40: Integrated Control

    Integrated Control 24VAC Indoor Blower Terminals Ignitor and Combustion Air Inducer Neutrals Flame Sense S4 DIP Switches Diagnostic Push Button On Board Links THERMOSTAT CONNECTIONS (TB1) 3/16” QUICK CONNECT TERMINALS 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 41 The blower off delay affects comfort and is adjust­ able to satisfy individual applications. Adjust the blower off EL296UHE units are equipped with a two-stage integrated control. This control manages ignition timing, heating delay to achieve a supply air temperature between 90° and mode fan off delays and indoor blower speeds based on 110°F at the exact moment that the blower is de-energized.
  • Page 42 TABLE 13 EL296 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links (See figure 58) 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...
  • Page 43 TABLE 13 EL296 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links (See figure 58) 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...
  • Page 44 TABLE 13 EL296 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links (figure 58) DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7724U TERM.
  • Page 45 TABLE 13 EL296 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links (figure 58) DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7742U TERM.

  • Page 46: Unit Start Up

    Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor. The gas valve on the EL296UHE is equipped with a gas control switch (lever). Use only your hand to move switch.

  • Page 47: Gas Pressure Measurement

    3 - After a 15-second prepurge, the hot surface ignitor en­ NOTE - Pressure test adapter kit (10L34) is available from ergizes. Lennox to facilitate manifold pressure measurement. 4 - After a 20-second ignitor warm-up period, the gas A manifold pressure post located on the gas valve provides valve solenoid opens.

  • Page 48: 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 au­ bustion.

  • Page 49: Other Unit Adjustments

    G in the current standards of the National Fuel Gas Code ANSI-Z223.1/NPFA 54 After the EL296UHE gas furnace has been started, the fol­ in the U.S.A., and the appropriate Natural Gas and lowing test should be conducted to ensure proper venting Propane appliances venting sizing tables in the cur­...

  • Page 50: Sequence Of Operation

    The low-fire (first stage) gas valve continues operation. The indoor EL296UHE units has an added feature of an internal blower motor is switched to the low-fire heating speed. Watchguard control. The feature serves as an automatic...

  • Page 51: Service

    13 Perform a complete combustion analysis during the fur­ At the beginning of each heating season, and to comply nace inspection to ensure proper combustion and oper­ with the Lennox Limited Warranty, your system should ation. Consult Service Literature for proper combustion be checked as follows: values.

  • Page 52: Repair Parts List

    Check the supply pressure and the manifold pressure The following repair parts are available through Lennox on both low fire and high fire. If manifold pressure ad­ dealers. When ordering parts, include the complete fur­...
  • Page 53 ADDENDUM FOR THE PROVINCE OF SASKATCHEWAN See below for venting in the province of Saskatchewan. Lennox approves the following termination for use in Saskatchewan Canada. 12” 3” (76MM) 2” (51MM) Vent Pipe Vent Pipe A − Clearance above grade or 12”...
  • Page 54 Requirements for Commonwealth of Massachusetts Modifications to NFPA-54, Chapter 10 4 - INSPECTION. The state or local gas inspector of the side wall, horizontally vented, gas-fueled equipment Revise NFPA-54 section 10.8.3 to add the following re­ shall not approve the installation unless, upon inspec­ quirements: tion, the inspector observes carbon monoxide detec­...

  • Page 55: Start-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 Supply Duct Temperature _______ AMPS______ Temperature Drop = _________ TEMPERATURE RISE TOTAL EXTERNAL STATIC (dry coil) Supply Duct Temperature ________ Supply External Static _______ Return Duct Temperature...

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Elite seriesEl296e

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