Lennox EL180UHNE Series Unit Information
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Lennox EL180UHNE Series Unit Information

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Service Literature
EL180UHNE series units are mid-efficiency gas furnaces
used for upflow or horizontal applications only, manufac­
tured with Lennox Duralokt heat exchangers formed of
aluminized steel. EL180UHNE units are available in heat­
ing capacities of 40,000 to 100,000 Btuh and cooling ap­
plications 2 to 5 tons. Refer to Engineering Handbook for
proper sizing.
EL180UHNE model units are equipped with a hot surface
ignition system. The EL180UHNE unit meets the new Cali­
fornia 14 ng/J Nitrogen Oxides (NO
nia Seasonal Efficiency requirements. All units use a redun­
dant gas valve to assure safety shut-off as required by
C.S.A.
All specifications in this manual are subject to change. Pro­
cedures outlined in this manual are presented as a recom­
mendation only and do not supersede or replace local or
state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except
where noted) are recommended only and do not constitute
code.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in­
jury. Take care while handling this equipment and
wear gloves and protective clothing.

TABLE OF CONTENTS

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Parts Identification
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II Installation
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III Start Up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Heating System Service Checks
V Typical Operating Characteristics
VI Maintenance
. . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation
Corp. 1803-L1
Revised 10/2019
) Standards and Califor­
x
Page 2
Page 3
Page 5
Page 6
Page 17
Page 17
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Page 17
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Page 21
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Page 24
Page 1
EL180UHNE
WARNING
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.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon­
nect switch(es). Unit may have multiple
power supplies.
© 2019 Lennox Industries Inc.

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Summary of Contents for Lennox EL180UHNE Series

  • Page 1 EL180UHNE Corp. 1803-L1 Service Literature Revised 10/2019 EL180UHNE series units are mid-efficiency gas furnaces used for upflow or horizontal applications only, manufac­ tured with Lennox Duralokt heat exchangers formed of aluminized steel. EL180UHNE units are available in heat­ ing capacities of 40,000 to 100,000 Btuh and cooling ap­...

  • Page 2: Specifications

    SPECIFICATIONS Model No. EL180UH040NE36A EL180UH060NE36A EL180UH080NE48B EL180UH100NE60C Heating AFUE Performance Input - Btuh 40,000 60,000 80,000 100,000 Output - Btuh 32,700 49,000 70,500 81,500 Temperature rise range - °F 20 - 50 30 - 60 35 – 65 35 – 65 Gas Manifold Pressure (in.

  • Page 3: Blower Data

    BLOWER DATA EL180UH040NE36A PERFORMANCE (Less Filter) External Air Volume / Watts at Various Blower Speeds Static High Medium-High Medium Medium-Low Pressure Watts Watts Watts Watts Watts in. w.g. 0.00 1430 1200 1025 0.10 1395 1165 1005 0.20 1370 1130 0.30 1345 1100 0.40...
  • Page 4 BLOWER DATA EL180UH100NE60C (Less Filter) Air Volume / Watts at Different Blower Speeds Single Side Return Air − Air volumes in bold require External Bottom Return Air, Side Return Air with Return Air from Both Optional Return Air Base and field fabricated transition to Static Sides or Return Air from Bottom and One Side.
  • Page 5 PARTS ARRANGEMENT Heat Exchanger Combustion Air Inducer Gas Valve Intake Screen Intake Air Elbow Control Box (includes integrated control, interlock switch and transformer) Inner Access Access Panel Panel Blower Assembly Power Choke (4 and 5 Ton Only) FIGURE 1 Page 5...

  • Page 6: I Unit Components

    I-UNIT COMPONENTS 4. Integrated Control (A92) EL180UHNE unit components are shown in figure 1.The gas valve, combustion air inducer and burners can be ac­ cessed by removing the upper access panel. Electrical WARNING components are in the control box (figure 2) found in the blower section.
  • Page 7 TABLE 1 TABLE 3 4-Pin Terminal Designation 1/4” QUICK CONNECT TERMINALS PIN # FUNCTION 120HUM Humidifier 120VAC Combustion Air Inducer Line LINE 120VAC Ignitor Line XFMR Transformer 120VAC Combustion Air Inducer Neutral CIRC Indoor blower 120VAC Ignitor Neutral Indoor air quality accessory 120VAC TABLE 2 NEUTRALS Common 120VAC...
  • Page 8 TABLE 4 The integrated control is equipped with an LED light for troubleshooting. The diagnostic codes are listed below in table 4. RED LED Diagnostic Codes / Status of Furnace Flash Code No power to control or board fault detected Heartbeat Normal Operation - Idle, Continuous Fan, Cool Continuous Rapid Flash...
  • Page 9 ELECTRONIC IGNITION 5 SEC É É Trial for Pre -Purge Ignitor Warm-up Blower “On”* Post Ignition Delay Purge É É É É É É É É É É É É É É É É É É É É É É É É É É DEMAND É...
  • Page 10 Field Test Mode. The menu will display the flame signal. See Lennox Repair Parts Handbook if limit switch must be See Table 15 for flame signal. replaced.
  • Page 11 15 seconds before burner ignition (pre‐purge) and for 5 seconds after the gas valve closes (post‐purge). 10. Combustion Air Inducer Prove Switch (S18) EL180UHNE series units are equipped with a combustion air pressure switch (figure 7) located near the gas valve. The Negative -...
  • Page 12 Replacing the Pressure Switch or Tubing FIGURE 8 Page 12...
  • Page 13 Ignitor Check Out Test 1 Remove 5-pin plug from control Check ohms reading across terminals 1and 5 Ohm value should be between 39 - 70. Meter (set to ohms) Integrated control detail Test 2 Seperate the 2-pin jack plug near the manifold and check resistance of the ignitor.
  • Page 14 13. Blower Motor BLOWER WHEEL REPLACEMENT IMPORTANT Center Blower Wheel in Blower Housing Each blower is statically and dynamically bal­ anced as an assembly before installation in the unit. EL180UHNE units are equipped with a constant torque ECM motor. It has a DC motor coupled to an electronic con­ trol module both contained in the same motor housing.
  • Page 15 Multi−Meter (set to VAC) Multi−Meter (set to VAC) Test 1 Test 3 (if necesssary) Turn on power to unit. Check for 120 volts across terminals Check for 120 volts across terminals “CIRC” and “Neutrals” “L” and “N” on input plug P48. If voltage is present continue on the integrated control.
  • Page 16 Replacing the Motor Module Motor Test 1. Disconnect electrical power to unit. 2. Remove unit access panel. 3. Unplug the two harnesses from the motor control mod­ ule. See figure 13. Unplug the Two Harness Connection TWO HARNESS FIGURE 15 CONNECTIONS TABLE 8 MOTOR...

  • Page 17: Iii Start Up

    II- PLACEMENT AND INSTALLATION Turning Off Gas to Unit 1 - Set the thermostat to the lowest setting. Make sure unit is installed in accordance with installation instructions and applicable codes. 2 - Turn off all electrical power to the unit if service is to be III- START‐UP performed.
  • Page 18 4 - Shut unit off and remove manometer as soon as an ac­ Gas Leak Detector is strongly recommended. It is available curate reading has been obtained. through Lennox under part number 31B2001. See Corp. 5 - Start unit and perform leak check. Seal leaks if found..
  • Page 19 H- Proper Ground and Voltage CHECK VOLTAGE BETWEEN LINE HOT A poorly grounded furnace can contribute to poor flame AND LINE NEUTRAL sense signal. Use the following procedure to check for ground and voltage to the integrated control. 1 - Measure the AC voltage between Line Neutral (spade terminals) and “C”...
  • Page 20 V-TYPICAL OPERATING CHARACTERISTICS C-External Static Pressure 1 - Tap locations shown in figure 22 . A-Blower Operation and Adjustment 2 - Punch a 1/4” diameter hole in supply and return air NOTE- The following is a generalized procedure and plenums. Insert manometer hose flush with inside does not apply to all thermostat controls.

  • Page 21: Vi Maintenance

    TABLE 13 Filter Size Furnace At the beginning of each heating season, and to comply Cabinet Width with the Lennox Limited Warranty, your system should be Side Return Bottom Return checked by a licensed professional technician (or equiva­ A - 14-1/2”...
  • Page 22 Cleaning the Heat Exchanger and Burners 11- Reinstall heat exchanger in vestibule. (Replace the five screws in the cabinet from step 10 if removed). NOTE - Use papers or protective covering in front of the fur­ nace during cleaning. 12- Reinstall the air fuel plenum and air intake assembly. 1 - Turn off both electrical and gas power supplies to fur­...
  • Page 23 BURNER, C.A.I ASSEMBLY & HEAT EXCHANGER REMOVAL Burner Gasket Air Gas Plenum Gas Valve Heat Exchanger Burner Box Liner (leave intact) Air Intake Assembly (leave intact) FIGURE 23 Remove 5 screws if necessary (either side of cabinet) FIGURE 24 Page 23...

  • Page 24: Vii Wiring And Sequence Of Operation

    VII- Wiring and Sequence of Operation EL180UHNE060/080/100 Schematic Line voltage is applied to L1 and N. the T1 low voltage transformer is energized, and line voltage is applied to B3 indoor blower. S47 rollout switch(es) must be closed in order for 24V from transformer to be output on integrated control ”R” to power thermo­ stat.
  • Page 25 EL180UHNE040 Schematic Line voltage is applied to L1 and N. the T1 low voltage transformer is energized, and line voltage is applied to B3 indoor blower. S47 rollout switch(es) must be closed in order for 24V from transformer to be output on integrated control ”R” to power thermo­ stat.

  • Page 26: Heating Sequence Of Operation

    Troubleshooting: Heating Sequence of Operation HEATING SEQUENCE OF OPERATION ABNORMAL HEATING MODE NORMAL HEATING MODE POWER ON GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER DELAY OFF. CONTROL SELF-CHECK OKAY? LED SLOW FLASH (RESET CONTROL BY TURNING MAIN POWER OFF.) LED FLASHES CODE 1 - POLARITY REVERSED.
  • Page 27 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE CONTINUED NORMAL HEATING MODE ABNORMAL HEATING MODE 15‐SECOND COMBUSTION AIR INDUCER PREPURGE INITIATED BY CLOSED PRESSURE SWITCH. LED FLASHES CODE 13 - LOW LINE VOLTAGE. ONCE VOLTAGE IS ABOVE IGNITOR WARM‐UP -- 20 SECONDS. IS VOLTAGE ABOVE 70 VOLTS? 75 VOLTS, HEATING SEQUENCE RESTARTS.
  • Page 28 Troubleshooting: Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION NORMAL COOLING MODE ABNORMAL COOLING MODE POWER ON IGNITION CONTROL MAIN POWER ON. GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF WITH NORMAL DELAY. CONTROL SELF DIAGNOSTIC CHECK. SIGNAL CIRCUIT BOARD FAILURE AT LED. IS CONTROL OPERATING NORMALLY? INTERRUPT MAIN POWER TO RESET CONTROL.
  • Page 29 Troubleshooting: Continuous Fan Sequence of Operation CONTINUOUS FAN SEQUENCE OF OPERATION LED: SLOW FLASH RATE REMAINS UNCHANGED THROUGHOUT SEQUENCE. MANUAL FAN SELECTION MADE AT THERMOSTAT. CONTROL (G) ENERGIZES SYSTEM FAN AT FAN SPEED. EAC TERMINAL IS ENERGIZED. THERMOSTAT CALLS FOR HEAT (W). SYSTEM FAN CONTINUES FAN SPEED WITHOUT THERMOSTAT CALLS FOR COOLING.

This manual is also suitable for:

El180uh040ne36aEl180uh100ne60cEl180uh060ne36aEl180uh080ne48b

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