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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 .............................................................2
EL180UHN Gas Furnace................................................3
Shipping and Packing List ..............................................3
Safety .............................................................................3
Use of Furnace as a Construction Heater ......................4
General ...........................................................................5
Combustion, Dilution, Ventilation Air...............................5
Setting Equipment ..........................................................8
Filters ............................................................................ 11
Duct System ................................................................. 11
Venting..........................................................................13
the
refrigerant
detection
INSTALLATION
INSTRUCTIONS
EL180UHNE(K)
ELITE
SERIES GAS FURNACE
®
UPFLOW / HORIZONTAL AIR DISCHARGE
508545-01
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 may damage or bend the tubes causing noise
and or unsafe operation.
Heat Exchanger Tubes
Gas Piping ....................................................................18
Electrical .......................................................................20
Integrated Control .........................................................24
Twinning .......................................................................29
Low GWP Application ...................................................30
Unit Start-Up .................................................................33
Gas Pressure Measurement.........................................34
Proper Combustion.......................................................34
High Altitude .................................................................34
Other Unit Adjustments.................................................35
Service..........................................................................35
Start-Up Checklist.........................................................38
Page 1
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Summary of Contents for Lennox ELITE EL180UHNE
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Page 1: Table Of Contents
Doing so may damage or bend the tubes causing noise and or unsafe operation. Heat Exchanger Tubes WARNING 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
Unit Dimensions - inches (mm) NOTE - 60C and 60D size units that require air volumes over 1800 cfm must have one of the following: 1. Single side return air and Optional Return Air Base with transition that must accommodate required 3-1/8 (79) 20 x 25 x 1 inch (508 x 635 x 25 mm) air filter to maintain proper velocity. -
Page 3: El180Uhn Gas Furnace
Certifications EL180UHNEK Gas Furnace EL180UHNEK units are CSA International certified to The EL180UHNEK unit is shipped ready for installation in ANSI Z21.47.In the USA, installation of gas furnaces must the upflow or horizontal position fueled by natural gas. The conform with local building codes. In the absence of local furnace is shipped with the bottom panel in place. -
Page 4: Use Of Furnace As A Construction Heater
Use of Furnace as Construction Heater When this furnace is used with cooling units, it shall be Lennox does not recommend the use of EL180UHNEK installed in parallel with, or on the upstream side of, cool- units as a construction heater during any phase of con- ing units to avoid condensation in the heating compart- struction. -
Page 5: General
CAUTION General These instructions are intended as a general guide and do Do not install the furnace in a corrosive or contaminated not supersede local codes in any way. Consult authorities atmosphere. Meet all combustion and ventilation air having jurisdiction before installation. requirements, as well as all local codes. - Page 6 Though an area may appear to be unconfined, it might Air from Inside be necessary to bring in outdoor air for combustion if the If the confined space that houses the furnace adjoins a structure does not provide enough air by infiltration. If the space categorized as unconfined, air can be brought in by furnace is located in a building of tight construction with providing two permanent openings between the two spac-...
- 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.
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Page 8: Upflow Applications
Upflow Applications Setting Equipment Allow for clearances to combustible materials as indicated WARNING on the unit nameplate. Minimum clearances for closet or alcove installations are shown in FIGURE 7. Do not install the furnace on its front or its back. Do not connect the return air ducts to the back of the furnace. -
Page 9: Side View
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: Removing The Bottom Panel
Pivot the bottom cap down to release the bottom tal applications. Order horizontal suspension kit (51W10) panel. Once the bottom panel has been removed, reinstall from 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
Before using any filter with this system, check the INTAKE AIR PIPE ENTRY specifications provided by the filter manufacturer against ENTRY the data given in the appropriate Lennox Product VENT Specifications bulletin. Additional information is provided PIPE in Service and Application Note ACC002 (August 2000). -
Page 12: Horizontal Unit
SUPPLY Install self tapping screws to seal any potential air leaks SUPPLY HORIZONTAL UNIT UPFLOW UNIT FIGURE 14 Return Air Plenum Air Intake Pipe Connections Upflow NOTE - Return air must not be drawn from a room where this furnace, or any other gas-fueled appliance (i.e., water heater), or carbon monoxide producing 4 ½”... -
Page 13: Venting
Venting VENT CONNECTION UPFLOW AND HORIZONTAL POSITION A 4-inch diameter flue transition is factory-installed on the “DISCONNECTED VENT” combustion air inducer outlet of all models WARNING STICKER VENT PIPE The EL180UHNEK series units are classified as fan-as- (min. 6” length) sisted Category I furnaces when vertically vented accord- ing to the latest edition of National Fuel Gas Code (NFPA 54 / ANSI Z223.1) in the USA. - Page 14 DO NOT insulate the space between the liner and 2 - In no case should the vent or vent connector diameter the chimney wall with puffed mica or any other loose be less than the diameter specified in the provided granular insulating material.
- Page 15 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 16 TABLE 3 Capacity of Type B Double-Wall Vents with Type B Double-Wall Connectors Serving a Single Category I Appliance Vent and Connector Diameter - D (inches) Height Lateral 3 inch 4 inch 5 inch 6 inch Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) NOTE - Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system.
- Page 17 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) Height Lateral 3 inch 4 inch 5 inch 6 inch Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) TABLE 5...
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Page 18: Gas Piping
1 - Seal any unused openings in the common venting Gas Supply system. WARNING 2 - Inspect the venting system for proper size and horizontal pitch. Determine that there is no blockage, Do not over torque (800 in-lbs) or under torque (350 in- restriction, leakage, corrosion, or other deficiencies lbs) when attaching the gas piping to the gas valve. - Page 19 TABLE 6 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)
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Page 20: Electrical
Horizontal Applications Possible Gas Piping Configurations MANUAL MAIN SHUT-OFF VALVE Horizontal Application MANUAL MAIN SHUT-OFF Left-Side Air Discharge VALVE GROUND JOINT UNION GROUND JOINT DRIP LEG UNION DRIP LEG MANUAL MAIN SHUT-OFF VALVE FIELD PROVIDED GROUND JOINT INSTALLED UNION Horizontal Application NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET DRIP LEG Right-Side Air Discharge... - Page 21 Electrically ground the unit according to local codes or, in INTERIOR MAKE-UP BOX INSTALLATION the absence of local codes, according to the current Na- tional Electric Code (ANSI/NFPA No. 70). A green ground wire is provided in the field make-up box. Right Side NOTE - The EL180UHNE furnace contains electronic components that are polarity sensitive.
- Page 22 COMBUSTION AIR INDUCER COMBUSTION AIR PROVING SWITCH 120V ACC (IF USED) BLOWER SPEED CHART FACTORY CONNECTED SPEED TAPS UNIT COOL HEAT PARK BLACK YELLOW BROWN,BLUE GAS VALVE BLOWER SPEED SELECTION PRIMARY GAS BLUE SPEED TAPS BLACK BROWN YELLOW LIMIT FLAME J159 JACK/PLUG CHART SENSOR...
- Page 23 COMBUSTION AIR INDUCER COMBUSTION AIR PROVING SWITCH 120V ACC (IF USED) BLOWER SPEED CHART FACTORY CONNECTED SPEED TAPS UNIT COOL HEAT PARK BLACK YELLOW BROWN,BLUE GAS VALVE BLOWER SPEED SELECTION PRIMARY GAS SPEED TAPS BLUE BLACK BROWN YELLOW LIMIT FLAME J159 SENSOR FLAME ROLLOUT...
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Page 24: 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- EL180UHNEK units are equipped with a single-stage inte- ates after the heat demand has been satisfied) may be grated control. -
Page 25: 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 26 Wiring Connections On Board Links Must Be Cut To Select Thermostat Heat Pump Options Dual Fuel... - Page 26 Single Stage, Constant, Torque, Non-Communicating 107792-01 FIGURE 28 TABLE 7 TABLE 8 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...
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Page 27: Ignition Control Diagnostic Codes
IGNITION CONTROL DIAGNOSTIC CODES DIAGNOSTIC CODES / STATUS OF FURNACE CODE IDLE MODE (DECIMALBLINKS AT 1 HERTZ -- 0.5 SECONDS ON, 0.5 SECONDS OFF INDOOR BLOWER OPERATION: CONTINUOUS FAN MODE (COSTANT TORQUE ONLY) INDOOR BLOWER OPERATION: FOLLOWED BY CFM SETTING FOR INDOOR BLOWER (1 SECOND ON, 0.5 SECOND OFF) / CFM SETTING FOR MODE DISPLAYED (VARIALBE SPEED ONLY) COOLING STAGE (1 SECOND ON, 0.5 SECOND OFF) 1 OR 2 DISPLAYED / PAUSE / REPEAT CODES. -
Page 28: Performance Warning
IGNITION CONTROLDIAGNOSTIC 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 29: Twinning
The 24 VAC secondary of the two systems must be in Twinning Two EL180UHNEK 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 30: 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 31 and follow steps below: FIGURE 30 1 - Route sensor wire #1 through provided grommet. - Page 31 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.
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Page 32: Start-Up Procedure
LGWP TEST BUTTON FUNCTIONALITY THERMOSTAT COMPATIBILITY The furnace control board is equipped with a Test/Reset Thermostats that preserve memory settings are compati- push button. The Test button can be used to perform sev- ble with the furnace control board. Examples include: eral functions, depending on the mode of operation of the •... -
Page 33: Unit Start-Up
7 - Wait five minutes to clear out any gas. If you then Unit Start-Up smell gas, STOP! Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s WARNING instructions. If you do not smell gas go to next step. Do not use this furnace if any part has been underwater. -
Page 34: Gas Pressure Measurement
11 - Are flame rollout switches tripped? If flame rollout TABLE 15 switches are tripped, call the service technician for GAS METER CLOCKING CHART inspection. Seconds for One Revolution Heating Sequence Of Operation (follow steps below) Natural LP/Propane Unit 1 - When thermostat calls for heat, combustion air 1 cu ft 2 cu ft 1 cu ft... -
Page 35: Other Unit Adjustments
Expected current draw will be less than 20mA. At the beginning of each heating season, and to comply Blower Speeds with the Lennox Limited Warranty, your system should be checked by a licensed professional technician (or equiva- Follow the steps below to change the blower speeds. - Page 36 the heat exchanger per the AHRI heat exchanger 12- Verify operation of smoke detectors and CO inspection procedure. This procedure can be viewed detectors and replace batteries as required. at www.ahrinet.org. See “Induced-draft Furnace Heat 13- Inspect the Low GWP sensor / sensors and rubber Exchanger Inspection Procedure”.
- Page 37 Repair Parts List Flame sensor The following repair parts are available through indepen- Heat exchanger assembly dent Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA Inter- Gas manifold national nameplate -- Example: EL180UH040NE36AK-01.
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Page 38: Gas Supply
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 LP/Propane Gas Natural Gas Sealed Piping Connections Tight Insulated (if necessary) Leak Tested Registers Open and Unobstructed... -
Page 39: Cooling Mode
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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