Lennox ELITE Series Installation Instructions Manual
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Lennox ELITE Series Installation Instructions Manual

Lennox ELITE Series Installation Instructions Manual

Gas furnace upflow / horizontal air discharge
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E 2015 Lennox Industries Inc.
Dallas, Texas, USA
AIR FLOW
HORIZONTAL LEFT
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UPFLOW
AIR FLOW
AIR FLOW
HORIZONTAL RIGHT

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INSTALLATION
INSTRUCTIONS
EL280UH
®
ELITE
SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
506894-01
01/2015
Supersedes 07/2014
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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  • Page 1: Table Of Contents

    INSTALLATION INSTRUCTIONS E 2015 Lennox Industries Inc. Dallas, Texas, USA EL280UH ® ELITE SERIES GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE 506894-01 01/2015 Supersedes 07/2014 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

    Unit Dimensions - inches (mm) 3−1/8 (79) NOTE − 60C and 60D size units that require air volumes over 1800 cfm (850 L/s) must have one of the following: 1. Single side return air with transition, to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) cleanable air filter.

  • Page 3: El280Uh Gas Furnace

    EL280UH Gas Furnace CAUTION The EL280UH unit is shipped ready for installation in the As with any mechanical equipment, personal injury upflow or horizontal right position (for horizontal left posi­ can result from contact with sharp sheet metal edges. Be careful when you handle this equipment. tion the combustion air pressure switch must be moved).

  • Page 4: Use Of Furnace As A Construction Heater

    Use of Furnace as Construction Heater See figure 1. With a parallel flow arrangement, a damper Lennox does not recommend the use of EL280UH units as (or other means to control the flow of air) must adequately a construction heater during any phase of construction.

  • Page 5: Combustion, Dilution & Ventilation Air

    Do not install the furnace where drafts might blow direct­ CAUTION ly into it. This could cause improper combustion and un­ safe operation. Do not install the furnace in a corrosive or contami­ Do not block the furnace combustion air openings with nated atmosphere.
  • Page 6 confined, it might be necessary to bring in outdoor air for Air from Inside combustion if the structure does not provide enough air by If the confined space that houses the furnace adjoins a infiltration. If the furnace is located in a building of tight space categorized as unconfined, air can be brought in by construction with weather stripping and caulking around providing two permanent openings between the two...
  • Page 7 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE (Inlet Air from Crawlspace and Outlet Air to Ventilated Attic) CHIMNEY OR GAS VENT VENTILATION LOUVERS (Each end of attic) OUTLET WATER FURNACE HEATER INLET VENTILATION LOUVERS (For unheated crawl space) NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch (645 ) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.

  • Page 8: Setting Equipment

    Upflow Applications Setting Equipment Allow for clearances to combustible materials as indicated WARNING on the unit nameplate. Minimum clearances for closet or al­ cove installations are shown in figure 7. Do not install the furnace on its front or its back. Do Upflow Application Installation Clearances not connect the return air ducts to the back of the fur­...
  • Page 9 Return Air -- Upflow Applications Single Side Return Air Return air can be brought in through the bottom or either (with transition and filter) side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make an airtight seal between the bottom of the furnace and the platform to ensure that the furnace operates properly and safely.
  • Page 10 Pivot the bottom cap down to release the bottom plications. Order horizontal suspension kit (51W10) from panel. Once the bottom panel has been removed, reinstall Lennox, or use equivalent suspension method. the bottom cap. See figure 10. Allow for clearances to combustible materials as indicated on the unit nameplate.

  • Page 11: Filters

    Use screws and joint tape to seal against the data given in the appropriate Lennox the return air system to the furnace. Product Specifications bulletin. Additional informa­...

  • Page 12: Duct System

    Return Air Plenum Duct System NOTE - Return air must not be drawn from a room­ Use industry‐approved standards (such as those pub­ where this furnace, or any other gas-fueled appliance lished by Air Conditioning Contractors of America or Ameri­ (i.e., water heater), or carbon monoxide producing de­...

  • Page 13: Venting

    If necessary reposition the combustion air inducer, pres­ Venting sure switch and or make up box as needed per the follow­ ing steps and see figures 16 through 21. A 4-inch diameter flue transition is factory‐installed on the combustion air inducer outlet of all models. Figure 15 1 - Remove the four mounting screws which secure the shows the combustion air inducer as shipped from the combustion air inducer / pressure switch assembly to...
  • Page 14 Horizontal Position HORIZONTAL RIGHT POSITION HORIZONTAL LEFT POSITION Top Vent Discharge Top Vent Discharge Vent Pipe Vent Pressure Switch Pressure Switch Pipe Flue Transition Cover Plate Flue Transitio FLOW FLOW Collector Box Cover Plate Collector Box Make-Up Box Make-Up Box Disconnect pressure switch hose from barbed fitting on the pres­...
  • Page 15 The EL280UH series units are classified as fan-assisted Masonry chimneys used to vent Category I central fur­ naces must be either tile‐lined or lined with a listed metal Category I furnaces when vertically vented according to lining system or dedicated gas vent. Unlined masonry the latest edition of National Fuel Gas Code (NFPA 54 / chimneys are prohibited.
  • Page 16 When inspection reveals that an existing chimney is not Common Venting Using Metal-Lined Masonry Chimney safe for the intended purpose, it shall be rebuilt to conform to nationally recognized standards, lined or relined with SEALED suitable materials, or replaced with a gas vent or chimney suitable for venting EL280UH series units.
  • Page 17 Common Venting Using Tile-Lined Interior Masonry Chimney and Combined Vent Connector MINIMUM LENGTH = AS SHORT AS PRACTICAL. INTERIOR TILE-LINED FOR MAXIMUM LENGTH SEE NOTE TO LEFT MASONRY CHIMNEY NOTE- Refer to provided venting tables for installations. NOTE - the chimney must be properly sized per provided venting tables or lined with listed metal lining system.
  • Page 18 16 - Vent connectors serving Category I appliances shall two consecutive table size diameters over the size of not be connected to any portion of mechanical draft the draft hood outlet or flue collar outlet. systems operating under positive pressure such as 20 - Do not install a manual damper, barometric draft regu­...
  • Page 19 TABLE 4 Vent Connector Capacity Type B Double-Wall Vents with Type B Double-Wall Connectors Serving Two or More Category I Appliances Vent and Connector Diameter - D (inches) Vent Connector 3 Inch 4 Inch 5 Inch 6 Inch Height Rise Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet)
  • Page 20 Removal of the Furnace from Common Vent 3 - Close all building doors and windows and all doors be­ tween the space in which the appliances remaining In the event that an existing furnace is removed from a connected to the common venting system are located venting system commonly run with separate gas ap­...

  • Page 21: Gas Piping

    4 - The piping should be sloped 1/4 inch (6.4 mm) per 15 Gas Piping feet (4.57 m) upward toward the meter from the fur­ Gas supply piping should not allow more than 0.5”W.C. nace. The piping must be supported at proper intervals drop in pressure between gas meter and unit.
  • Page 22 Left Side Piping MANUAL (Standard) MAIN SHUT-OFF AUTOMATIC MANUAL VALVE GAS VALVE MAIN SHUT-OFF (With 1/8 in. NPT AUTOMATIC VALVE Plugged Tap GAS VALVE (With 1/8 in. NPT Shown) Plugged Tap Shown) GROUND JOINT UNION GROUND JOINT UNION DRIP LEG Right Side Piping FIELD (Alternate)

  • Page 23: Caution

    Leak Check WARNING After gas piping is completed, carefully check all piping Electric Shock Hazard. Can cause connections (factory- and field-installed) for gas leaks. Use injury or death. Unit must be properly a leak detecting solution or other preferred means. grounded in accordance with national NOTE - If emergency shutoff is necessary, shut off the and local codes.
  • Page 24 Before connecting the thermostat, check to make sure the to this terminal with the neutral leg of the circuit being con­ wires will be long enough for servicing at a later date. Make nected to one of the provided neutral terminals. If a humidi­ sure that thermostat wire is long enough to facilitate future fier rated at greater than one amp is connected to this termi­...
  • Page 25 TABLE 7 Field Wiring Applications DIP Switch Settings and On-Board Links (See figure 30) W915 Thermostat Wiring Connections Two-Stage W951 DIP Switch 1 Cooling Heat Pumps 1 Heat / 1 Cool Intact Intact CONTROL OUTDOOR T'STAT TERM. STRIP UNIT NOTE - Use DIP switch 2 to set sec­...
  • Page 26 TABLE 7 Field Wiring Applications (Continued) DIP Switch Settings and On-Board Links (See figure 30) W915 Thermostat Wiring Connections Two-Stage W951 DIP Switch 1 Cooling Heat Pumps 2 Heat / 2 Cool Intact CONTROL OUTDOOR T'STAT TERM. STRIP UNIT 2 Heat / 1 Cool Intact Intact CONTROL...
  • Page 27 EL280UH Schematic Wiring Diagram FIGURE 29 Page 27...

  • Page 28: Integrated Control

    DIAGNOSTIC LEDs THERMOSTAT CONNECTIONS (TB1) SWITCHES ON-BOARD LINKS 1= ERROR CODE RECALL H= 24V HUMIDIFIER OUTPUT L= LENNOX SYSTEM OPERATION MONITOR DIP SWITCH FUNCTIONS W915 DIP SWITCH(ES) FUNCTION 1 -- 2 Stage T'stat Selects t/stat type (single or two-stage) W951...

  • Page 29: Unit Start-Up

    ply air temperature between 90° and 110°F at the exact WARNING moment that the blower is de-energized. Longer off delay settings provide lower supply air temperatures; shorter set­ If overheating occurs or if gas supply fails to shut off, tings provide higher supply air temperatures.Table 8 pro­ shut off the manual gas valve to the appliance before vides the blower off timings that will result from different shutting off electrical supply.

  • Page 30: Gas Pressure Adjustment

    NOTE - Pressure test adapter kit (10L34) is available from If the unit fails to operate, check the following: Lennox to facilitate manifold pressure measurement. 1 - Is the thermostat calling for heat? 1 - Connect test gauge to manifold pressure post (figure 2 - Are access panels securely in place? 31) gas valve.

  • Page 31: High Altitude

    High Altitude Proper Combustion Furnace should operate minimum 15 minutes with correct The manifold pressure may require adjustment and com­ manifold pressure and gas flow rate before checking com­ bustion air pressure switch may need replacing to ensure bustion. Table 10 shows acceptable combustion for ALL proper combustion at higher altitudes.

  • Page 32: Other Unit Adjustments

    Electrical Other Unit Adjustments 1 - Check all wiring for loose connections. Primary and Secondary Limits 2 - Check for the correct voltage at the furnace (furnace The primary limit is located on the heating compartment operating). Correct voltage is 120VAC + 10%. vestibule panel.
  • Page 33 NOTE - If the low fire pressure switch does not close the on low heat speed. Combustion air inducer runs until S128 low heat prove switch contacts close (switch combustion air inducer will switch to high fire. After a 15 must close within 2 1/2 minutes or control goes into second pre-purge the high fire pressure switch will close Watchguard Pressure Switch mode.

  • Page 34: Service

    Annual Furnace Maintenance 14 Verify operation of CO detectors and replace batteries At the beginning of each heating season, and to comply with the Lennox Limited Warranty, your system should as required. be checked as follows: Perform a general system test. Turn on the furnace to...
  • Page 35 Cleaning the Burners 4 - To clean burners, run a vacuum cleaner with a soft brush attachment over the face of burners. Visually in­ NOTE - Use papers or protective covering in front of the fur­ spect inside the burners and crossovers for any block­ nace during cleaning.

  • Page 36: Repair Parts List

    Repair Parts List Flame sensor The following repair parts are available through indepen­ Heat exchanger assembly dent Lennox dealers. When ordering parts, include the Gas manifold complete furnace model number listed on the CSA Interna­ Combustion air inducer tional nameplate -- Example: EL280UH045P24A-01. All...

  • Page 37: Troubleshooting

    Start-Up & Performance Check List UNIT SET UP (typical) Unit Model Number_______________ Serial Number___________________ SUPPLY Line Voltage upflow furnace shown Gas Supply Pressure Filter RETURN RETURN DUCT SYSTEM GAS SUPPLY SUPPLY AIR DUCT Natural Gas LP/Propane Gas Sealed Piping Connections Tight Insulated (if necessary) Leak Tested Registers Open and Unobstructed...
  • Page 38 UNIT OPERATION (typical) Combustion CO SUPPLY Thermostat Gas Manifold Pressure Temperatures upflow furnace shown Filter Blower Motor Amps Duct Static RETURN RETURN COOLING MODE HEATING MODE INDOOR BLOWER AMPS______ GAS MANIFOLD PRESSURE “W.C._____ TEMPERATURE DROP COMBUSTION SAMPLE CO CO PPM_______ ______ Return Duct Temperature _________ Supply Duct Temperature...

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Elite el280uh

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