Lennox Elite EL195UHNEK Installation Instructions Manual
Lennox Elite EL195UHNEK Installation Instructions Manual

Lennox Elite EL195UHNEK Installation Instructions Manual

Gas furnace upflow / horizontal air discharge

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© 2024 Lennox Industries Inc.
Dallas, Texas USA
WARNING
This furnace is equipped with an ignition control
factory enabled for use with Lennox A2L refrigerant
systems.
Disabling
functionality on A2L system is prohibited by safety
codes. Refer to furnace installation instructions for
non-A2L and non-Lennox refrigerant system setup.
Contents
Unit Dimensions - inches (mm) ......................................2
EL195UHNEK Gas Furnace ...........................................3
Shipping and Packing List ..............................................3
Safety Information ..........................................................3
Use of Furnace as Construction Heater .........................4
General ...........................................................................4
Combustion, Dilution & Ventilation Air ............................5
Shipping Bolt Removal ...................................................8
Installation - Setting Equipment ......................................8
Filters ............................................................................13
Duct System .................................................................13
Pipe Fittings Specifications...........................................14
Joint Cementing Procedure ..........................................16
Venting Practices ..........................................................16
the
refrigerant
detection
INSTALLATION
INSTRUCTIONS
EL195UHNEK
ELITE
SERIES GAS FURNACE
®
UPFLOW / HORIZONTAL AIR DISCHARGE
508575-01
11/2024
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.
IMPORTANT
DO NOT use the heat exchanger tubes to lift, drag or
pull the furnace to its installation location.
Doing so will damage the tubes causing noise and or
unsafe operation.
Heatexchanger Tubes
Vent Piping Guidelines .................................................17
Gas Piping ....................................................................36
Electrical .......................................................................39
Ignition Control .............................................................41
Twinning .......................................................................46
Low GWP Application ...................................................47
Unit Start-Up .................................................................50
Gas Pressure Adjustment .............................................52
Proper Combustion.......................................................52
High Altitude Information ..............................................52
Testing for Venting and Combustion Air........................53
Service..........................................................................55
Repair Parts List ...........................................................56
Start-Up & Performance Check List .............................57
Blower Data ..................................................................59
Page 1

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Summary of Contents for Lennox Elite EL195UHNEK

  • Page 1: Table Of Contents

    Doing so will damage the tubes causing noise and or unsafe operation. WARNING Heatexchanger Tubes This furnace is equipped with an ignition control factory enabled for use with Lennox A2L refrigerant systems. Disabling refrigerant detection functionality on A2L system is prohibited by safety codes.
  • Page 2: Unit Dimensions - Inches (Mm)

    EL195UHNEK Unit Dimensions - inches (mm) EXHAUST AIR 3-1/4 NOTE - 60C size units that require air volumes over OUTLET (83) 1800 cfm must have one of the following: 1. Single side return air and Optional Return Air Base 1-7/8 (48) with transition that must accommodate required 20 x 25 x 1 inch (508 x 635 x 25 mm) air filter to maintain proper velocity.
  • Page 3: El195Uhnek Gas Furnace

    EL195UHNEK Gas Furnace Shipping and Packing List Package 1 of 1 contains The EL195UHNEK Category IV gas furnace is shipped ready for installation in the upflow or horizontal position. The furnace is 1 - Assembled EL195UHNEK unit shipped with the bottom panel in place. The bottom panel must 1 - Bag assembly containing the following: be removed if the unit is to be installed in horizontal or upflow 1 - Snap bushing...
  • Page 4: Use Of Furnace As Construction Heater

    Installed in Combination with a Cooling Coil Use of Furnace as Construction Heater NOTE - If a non-Lennox coil is used, consult the coil’s lit- Lennox does not recommend the use of EL195UHNEK erature for the recommended distance from the top of the units as a construction heater during any phase of con- furnace cabinet/heat exchanger.
  • Page 5: General

    • The input rate and temperature rise must be set per WARNING the furnace rating plate. Insufficient combustion air can cause headaches, • One hundred percent (100%) outdoor air must be nausea, dizziness or asphyxiation. It will also cause provided for combustion air requirements during excess water in the heat exchanger resulting in rusting construction.
  • Page 6: Unconfined Space

    Even a small leak around the base of the unit at the plat- CAUTION form or at the return air duct connection can cause a po- tentially dangerous negative pressure condition. Air for Do not install the furnace in a corrosive or contaminated combustion and ventilation can be brought into the con- atmosphere.
  • Page 7 EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE EQUIPMENT IN CONFINED SPACE (Inlet Air from Crawl Space and Outlet Air to Outside) (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside) VENTILATION LOUVERS Roof Terminated (Each end of attic) Exhaust Pipe ROOF TERMINATED EXHAUST PIPE...
  • Page 8: Shipping Bolt Removal

    Flexible mounting leg). See FIGURE 10. The bolt and EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE washer must be removed before the furnace is placed into (All Air Through Ventilated Attic) operation. After the bolt and washer have been removed, the rigid leg will not touch the blower housing.
  • Page 9: Horizontal Application

    SETTING EQUIPMENT UPFLOW APPLICATION Place level on blower Place level on the front blower deck screws to check deck to check side to side forward tilt UNIT FRONT AIR FLOW 1/2” max. SIDE VIEW HORIZONTAL APPLICATION UNIT FRONT AIR FLOW 1/2”...
  • Page 10 Return Air Guidelines WARNING Return air can be brought in through the bottom or either Improper installation of the furnace can result in personal side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make injury or death.
  • Page 11: Front View

    Optional Return Air Base CONDENSATE (Upflow Applications Only) TRAP FURNACE FRONT 23 (584) 3−1/4 IF BASE Overall (83) IS USED (Maximum) Minimum WITHOUT 11 (279) IAQ CABINET, Maximum 22−7/16 INDOOR AIR A SINGLE Unit side return air 14 (356) (570) QUALITY RETURN AIR Opening...
  • Page 12 6 - Continue with exhaust, condensate and intake piping on a platform, as shown in FIGURE 19. A horizontal sus- installation according to instructions. pension kit (51W10) may be ordered from Lennox or use equivalent. NOTE - Heavy-gauge sheet metal straps may be used to suspend the unit from roof rafters or ceiling joists.
  • Page 13: Filters

    Use fiberglass sealing strips, caulking, or equiva- the data given in the appropriate Lennox Product lent sealing method between the plenum and the furnace Specifications bulletin. Additional information is provided cabinet to ensure a tight seal.
  • Page 14: Pipe Fittings Specifications

    SUPPLY Install self tapping screws to seal any potential air leaks SUPPLY HORIZONTAL UNIT UPFLOW UNIT FIGURE 20 TABLE 2 Continued Pipe & Fittings Specifications All pipe, fittings, primer and solvent cement must conform PIPING AND FITTINGS SPECIFICATIONS with American National Standard Institute and the Ameri- Schedule 40 ABS (Fittings) D2468 can Society for Testing and Materials (ANSI/ASTM) stan-...
  • Page 15 Use PVC primer and solvent cement or ABS solvent ce- Canadian Applications Only - Pipe, fittings, primer and sol- ment meeting ASTM specifications, refer to TABLE 2. vent cement used to vent (exhaust) this appliance must As an alternate, use all purpose cement, to bond ABS, be certified to ULC S636 and supplied by a single manu- PVC, or CPVC pipe when using fittings and pipe made of facturer as part of an approved vent (exhaust) system.
  • Page 16: Joint Cementing Procedure

    Joint Cementing Procedure Venting Practices All cementing of joints should be done according to the NOTE - For any Low GWP refrigerant systems with ex- specifications outlined in ASTM D 2855. posed line set joints installed in the same space, each non-direct vent furnace system must have a refrigerant DANGER detection sensor installed below the level of the burners...
  • Page 17: Vent Piping Guidelines

    FIGURE 22 Vent Piping Guidelines Exhaust Piping FIGURE 23, FIGURE 26 and FIGURE NOTE - Lennox has approved the use of DuraVent ® Centrotherm manufactured vent pipe and terminations as an option to PVC. When using the PolyPro® by Du-...
  • Page 18 NOTE - The exhaust collar on all models is sized to ac- Use the following steps to correctly size vent pipe diam- eter. commodate 2” Schedule 40 vent pipe. In horizontal ap- plications, any transition to exhaust pipe larger than 2” Pipe Size Process must be made in vertical runs of the pipe.
  • Page 19 TABLE 5 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 20 TABLE 5 Continued 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 21 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 - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.
  • Page 22 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS EXHAUST EXHAUST INTAKE 2” 2” 2” 2” 3” Appliance TRANSITION Appliance Adaptor 2” Adaptor DO NOT transition *2” from smaller to larger 2” 3” pipe in horizontal runs *2”...
  • Page 23 Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS The EL195UHNEK furnace may be installed in either di- UPFLOW NON−DIRECT rect vent or non-direct vent applications. In non-direct VENT APPLICATIONS vent applications, when intake air will be drawn into the furnace from the surrounding space, the indoor air quality must be considered and guidelines listed in Combustion, Dilution and Ventilation Air section must be followed.
  • Page 24 General Guidelines for Vent Terminations CAUTION In Non-Direct Vent applications, combustion air is taken If this unit is being installed in an application with from indoors and the flue gases are discharged to the out- combustion air coming in from a space serviced by an doors.
  • Page 25 TABLE 7 Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For Winter Design Temperatures Single - Stage High Efficiency Furnace Unit Input Size Winter Design Vent Temp °F (°C) Pipe Diam 32 to 21 2 in (0 to -6) 3 in 20 to 1...
  • Page 26 ‡ Permitted only if veranda, porch, deck or balcony is fully open NOTE - This figure is intended to illustrate clearance on a minimum of two sides beneath the floor. Lennox recommends requirement and does not serve as a substitute for avoiding this location if possible.
  • Page 27 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of locally adopted installation codes. two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 35 Page 27...
  • Page 28 Details of Intake and Exhaust Piping Terminations for 3”(76mm) MAX. Direct Vent Installations Inches(mm) NOTE - In Direct Vent installations, combustion air is taken UNCONDITIONED from outdoors and flue gases are discharged to outdoors. ATTIC SPACE 8” (203mm) MIN NOTE - Flue gas may be slightly acidic and may adverse- ly affect some building materials.
  • 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 FIELD-PROVIDED Accelerator not required REDUCER MAY BE least one bracket must be used within 6” from the for 3”...
  • Page 30 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 31: Condensate Piping

    (USA) Crawl Space and Extended Horizontal Venting KIT 15Z70 Lennox provides kit 51W18 (USA) kit 15Z70 (Canada) to (CANADA) install 2” or 3” PVC exhaust piping through the floor joists and into the crawl space. See FIGURE 47. This kit can also be used as a supplemental drain for installations with condensate run back in the vent pipe (ie.
  • Page 32 Condensate line must maintain a 1/4” Heating cable kit is available from Lennox in various downward slope from the furnace to the drain. lengths; 6 ft. (1.8m) - kit no. 26K68 and 24 ft. (7.3m) - kit no.
  • Page 33 CONDENSATE TRAP LOCATIONS Condensate Trap With Optional Overflow Switch (Unit shown in upflow position with remote trap) From Evaporator Coil HorizontalFurnace4” Min. to 5” Max.above FieldProvidedVent condensatedrain connection) Min. 1” Above Condensate Drain Connection 1” Min. 2” Max. FurnaceCondensate *5’ max. DrainConnection PV C PipeOnly Optional...
  • Page 34 Furnace 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 5’ max. PVC Pipe Only Condensate Drain Connection (Trap at coil is optional) Drain Pan Piping from furnace and evaporator coil must slope down a minimum 1/4”...
  • Page 35 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 36: Gas Piping

    6 - In some localities, codes may require installation of a Gas Piping manual main shut-off valve and union (furnished by Gas supply piping should not allow more than 0.5”W.C. installer) external to the unit. Union must be of the drop in pressure between gas meter and unit.
  • Page 37 Right Side Piping MANUAL MAIN SHUT-OFF VALVE GROUND JOINT UNION DRIP LEG Gas Valve FIELD PROVIDED AND INSTALLED NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET FIGURE 58 Horizontal Applications Possible Gas Piping Configurations Horizontal Application MANUAL MAIN SHUT-OFF Right-Side Air Discharge...
  • Page 38 TABLE 9 Gas Pipe Capacity - ft3/hr (m3/hr) Nominal Internal Length of Pipe - feet (m) Iron Pipe Diameter Size Inches inches (3.048) (6.096) (9,144) (12,192) (15.240) (18.288) (21.336) (24.384) (27.432) (30,480) (mm) (mm) .622 (12.7) (17.799) (4.87) (3.34) (2.69) (2.29) (2.03) (1.84)
  • Page 39: Electrical

    The power supply wiring must meet Class I restrictions. Electrical Protected by either a fuse or circuit breaker, select circuit protection and wire size according to unit nameplate. IMPORTANT NOTE - Unit nameplate states maximum current draw. When matching this gas furnace with zoning, Maximum Over-Current Protection allowed is 15 AMP.
  • Page 40 FIGURE 61 Page 40...
  • Page 41: Ignition Control

    Indoor Blower Operation DIP Switch Settings IGNITION CONTROL The heat fan-on time of 30 seconds is not adjustable The Integrated Control DIP Switch Settings heat fan-off delay (amount of time that the blower oper- EL195UHNEK units are equipped with a single-stage inte- ates after the heat demand has been satisfied) may be grated control.
  • Page 42: Wiring Connections

    On Board Links Must NOT Be Cut To Select Thermostat Wiring Connections AC ON System Options Heat / Cool FURNACE OUTDOOR T'STAT TERM. STRIP UNIT DO NOT CUT ANY ON-BOARD LINKS FIGURE 62 Wiring Connections On Board Links Must Be Cut To Select Thermostat Heat Pump Options Dual Fuel...
  • Page 43 Single Stage, Constant Torque, Non-Communicating 107792-01 FIGURE 64 TABLE 10 TABLE 11 1/4” QUICK CONNECT TERMINALS THERMOSTAT INPUT TERMINALS HEAT 120V HUM POWER FOR HUMIDIFIER (120 VAC COMMON GROUND LINE INCOMING POWER LINE (120 VAC) 24V AC XFMR TRANSFORMER PRIMARY (120 VAC) CIRC INDOOR BLOWER MOTOR (120 VAC) COOL...
  • Page 44: Ignition Control Diagnostic Codes

    IGNITION CONTROL DIAGNOSTIC CODES DIAGNOSTIC CODES / STATUS OF FURNACE CODE IDLE MODE (DECIMAL BLINKS AT 1 HERTZ -- 0.5 SECONDS ON, 0.5 SECONDS OFF INDOOR BLOWER OPERATION: CONTINUOUS FAN MODE (CONSTANT TORQUE ONLY) INDOOR BLOWER OPERATION: FOLLOWED BY CFM SETTING FOR INDOOR BLOWER (1 SECOND ON, 0.5 SECOND OFF) / CFM SETTING FOR MODE DISPLAYED (VARIABLE SPEED ONLY) COOLING STAGE (1 SECOND ON, 0.5 SECOND OFF) 1 OR 2 DISPLAYED / PAUSE / REPEAT CODES.
  • Page 45: Performance Warning

    IGNITION CONTROL DIAGNOSTIC CODES (CONTINUED) SOFT LOCKOUT FAULTS (60 MINUTES) SOFT LOCKOUT-FLAME FAILURE ON IGNITION, IGNITION RETRY>MAX, LAST FAILED RETRY DUE E270 TO FLAME FAILURE SOFT LOCKOUT-PRESSURE SWITCH OPEN, IGNITION RETRY>MAX, LAST FAILED RETRY DUE TO E271 LPSW OPEN SOFT LOCKOUT-PRESSURE SWITCH OPEN, IN RUN MODE HEATING RECYCLES>MAX, LAST FAILED E272 RETRY DUE TO LPSW OPEN SOFT LOCKOUT-FLAME FAILURE IN RUN MODE,HEATING RECYCLES>MAX, LAST FAILED RETRY...
  • Page 46: Twinning

    The 24 VAC secondary of the two systems must be in Twinning Two EL195UHNEK Furnaces phase. All thermostat connections are made to one control The control board in this furnace is equipped with a provi- only. See diagram below. sion to ”twin” (interconnect) two(2) adjacent furnaces with The twinned furnace without thermostat connections is a common plenum such that they operate as one (1) large to have the call for heat supplied by an external 24VAC...
  • Page 47: Low Gwp Application

    Low GWP Application WARNING For use with Lennox approved evaporator coil and LGWP sensors only. Use original manufacturer recommended LGWP sensors if using non Lennox approved evaporator coil. CONNECTING THE FURNACE CONTROL BOARD SENSOR. See FIGURE 67 and follow steps below: FIGURE 66 1 - Route sensor wire #1 through provided grommet.
  • Page 48 FURNACE CONTROL BOARD LOW GWP MODES OF 2. The furnace control board activates the blower (high OPERATION speed). The blower purges refrigerant from the cabinet, plenum, and ductwork. The modes of operation for the furnace control board are Initializing, Normal, Leak Detected, and Fault. 3.
  • Page 49: Start-Up Procedure

    LGWP TEST BUTTON FUNCTIONALITY External Alarm (For applications with external alarms wired directly to the The furnace control board is equipped with a Test/Reset furnace control board) push button. The Test button can be used to perform sev- The furnace control board triggers the external alarm sys- eral functions, depending on the mode of operation of the tem when it enters Leak Detected mode.
  • Page 50: Unit Start-Up

    WARNING Unit Start Up Priming Condensate Trap If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal The condensate trap should be primed with water prior injury or death. to start-up to ensure proper condensate drainage. Either pour 10 fl.
  • Page 51 Turning Off Gas to Unit Heating Sequence Of Operation 1 - Set the thermostat to the lowest setting. 1 - When thermostat calls for heat, combustion air inducer starts. 2 - Turn off all electrical power to the unit if service is to be performed.
  • Page 52: Gas Pressure Adjustment

    4 - Shut unit off and remove manometer as soon as an Gas Pressure Adjustment accurate reading has been obtained. Take care to Gas Flow (Approximate) remove barbed fitting and replace threaded plug. 5 - Start unit and perform leak check. Seal leaks if found. TABLE 18 GAS METER CLOCKING CHART IMPORTANT...
  • Page 53: Testing For Venting And Combustion Air

    1 - Seal any unused openings in the venting system. Testing for Proper Venting and Sufficient Combus- 2 - Visually inspect the venting system for proper size and tion Air for Non-Direct Vent Applications horizontal pitch. Determine there is no blockage or WARNING restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.
  • Page 54 Blower Speeds Other Unit Adjustments Follow the steps below to change the blower speeds. Primary Limit. 1 - Turn off electrical power to furnace. The primary limit is located on the heating compartment 2 - Remove blower access panel. vestibule panel. This limit is factory set and requires no adjustment.
  • Page 55: Service

    At the beginning of each heating season, and to comply Perform a general system test. Turn on the furnace to with the Lennox Limited Warranty, your system should be check operating functions such as the start-up and shut- checked as follows: off operation.
  • Page 56: Repair Parts List

    Repair Parts List Blower Parts The following repair parts are available through Lennox dealers. When ordering parts, include the complete fur- Blower wheel nace model number listed on the CSA nameplate -- Ex- Motor ample: EL195UH040NE36BK-01. All service must be...
  • Page 57: Start-Up & Performance Check List

    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 58: Unit Operation

    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 59: Blower Data

    BLOWER DATA EL195UH040NE36BK PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External Static High Medium-High Medium Medium-Low (Black) (Brown) (Blue) (Yellow) (Red) Pressure in. w.g. Watts Watts Watts Watts Watts 0.00 1442 1283 1186 0.10 1413 1257 1155 0.20 1385...
  • Page 60 BLOWER DATA EL195UH100NE60CK PERFORMANCE (Less Filter) Air Volume / Watts at Different Blower Speeds Single Side Return Air − Air volumes in bold (over Bottom Return Air, Side Return Air with Return Air from 1800 cfm) require Optional Return Air Base and field External Both Sides or Return Air from Bottom and One Side.

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