Lennox EL180UHNE Series Manual

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Unit information (30 pages)

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S e r v i c e L i t e r a t u r e

EL180UHNE series units are mid-efficiency gas furnaces

used for upflow or horizontal applications only, manufac-

tured with heat exchangers formed of aluminized steel

tubes. EL180UHNE units are available in heating capaci-

ties of 40,000 to 100,000 Btuh and cooling applications 2

to 5 tons. Refer to Engineering Handbook for proper siz-

ing.

EL180UHNE model units are equipped with a hot surface

ignition system. The EL180UHNE unit meets the new Cal-

ifornia 14 ng/J Nitrogen Oxides (NOx) Standards and Cali-

fornia Seasonal Efficiency requirements. All units use a re-

dundant gas valve to assure safety shut-off as required by

C.S.A.

All specifications in this manual are subject to change.

Procedures outlined in this manual are presented as a

recommendation only and do not supersede or replace lo-

cal 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 injury. Take

care while handling this equipment and wear gloves and

protective clothing.

TABLE OF CONTENTS

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2

Blower Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3

Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . Page 8

I Unit Components . . . . . . . . . . . . . . . . . . . . . . . . Page 9

II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22

III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22

IV Heating Systems Checks . . . . . . . . . . . . . . . Page 22

V Typical Operating Characteristics . . . . . . . . . Page 32

VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 33

VII Wiring and Sequence of Operation

UNIT INFORMATION

Corp 1803-L1

Revised 04/2024

. . . . . . Page 36

Page 1

WARNING

Improper installation, adjustment, alteration, service

or maintenance can cause property damage, personal

injury or loss of life. Installation and service must be

performed by a licensed professional HVAC installer or

equivalent, service agency, or the gas supplier.

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 disconnect

switch(es). Unit may have multiple power

supplies.

EL180UHNE

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Summary of Contents for Lennox EL180UHNE Series

Page 1 S e r v i c e L i t e r a t u r e Revised 04/2024 EL180UHNE series units are mid-efficiency gas furnaces used for upflow or horizontal applications only, manufac- tured with heat exchangers formed of aluminized steel tubes.
Page 2 SP ECIF ICATIONS -01 to -04 Mod e ls Model No. EL180UH040NE36A EL180UH060NE36A EL180UH080NE48B EL180UH100NE60C Heating AHRI Ref. No. 202028472 202028473 202028474 202028475 Performance AFUE Input - Btuh 40,000 60,000 80,000 100,000 Output - Btuh 32,000 48,000 64,000 80,000 Temperature rise range - °F 20 - 50 30 - 60 35 –...
Page 3 BLO WER DATA -01 to -04 Mod els EL180UH040NE36A PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External Static High Medium-High Medium Medium-Low Pressure (Black) (Brown) (Blue) (Yellow) (Red) in. w.g. Watts Watts Watts Watts Watts 0.00 1423 1194 1079...
Page 4 BLOWER D ATA -01 to -04 Mod els EL180UH100NE60C (Less Filter) Air Volume / Watts at Different Blower Speeds Single Side Return Air - Air volumes in bold (over 1800 Bottom Return Air, Side Return Air with Return Air from cfm) require Optional Return Air Base and field fabricated External Both Sides or Return Air from Bottom and One Side.
Page 5 SP ECIF ICATIONS -05 an d Lat er M od els Model No. EL180UH040NE36A EL180UH060NE36A EL180UH080NE48B EL180UH100NE60C Heating AFUE Performance Input - Btuh 40,000 60,000 80,000 100,000 Output - Btuh 33,000 48,000 64,000 80,000 Temperature rise range - °F 20 - 50 30 - 60 30 –...
Page 6 BLO WER DATA -05 a nd Lat er Mod els EL180UH040NE36A PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External Static High Medium-High Medium Medium-Low Pressure (Black) (Brown) (Blue) (Yellow) (Red) in. w.g. Watts Watts Watts Watts Watts 0.00 1423...
Page 7 BLO WER DATA -05 a nd Lat er Mod els EL180UH080NE48B PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External Static High Medium-High Medium Medium-Low Pressure (Black) (Brown) (Blue) (Yellow) (Red) in. w.g. Watts Watts Watts Watts Watts 0.00 1881...
Page 8 Parts Arrangement Heat Exchanger Combustion Air Inducer Gas Valve Screen Reducer 2” PVC Pipe 2 ½” Length Elbow -05 and later models Intake Air Elbow Control Box (includes integrated control, Inner Access Access Panel interlock switch and transformer) Panel Blower Assemby Power Choke (4 and 5 Ton Only) FIGURE 1...
Page 9 I-UNIT COMPONENTS 3. Circuit Breaker (CB8) A 24V circuit breaker is also located in the control box. The EL180UHNE unit components are shown in FIGURE switch provides overcurrent protection to the transform- 1.The gas valve, combustion air inducer and burners can er (T1).
Page 10 TABLE 1 4-Pin Terminal Designation IGNITION CONTROL 103217-03 PIN # FUNCTION Combustion Air Inducer Line Ignitor Line Combustion Air Inducer Neutral Ignitor Neutral TABLE 2 12-Pin Terminal Designations PIN # FUNCTION High Limit Output IFC 103217-03 Not Used IFC 107163-01 Flame Sense 24V Line Not Used Rollout Switch Out...
Page 11 TABLE 4 Ignition Control 103217-03 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 Call For Heat / Burner Operation Reverse Line Voltage Polarity Improper Earth Ground Burner failed to light, or lost flame during heat demand...
Page 12 TABLE 5 Ignition Control 107163-01 RED LED Flash Code Diagnostic Codes / Status of Furnace No Power to Control or Board Fault Detected Board Fault Detected Fast Heartbeat Call for Heat / Burner Operation Slow Heartbeat Normal Operation – Idle, Continuous Fan, or Cool 1 Flash Reverse Line Voltage Polarity or Phasing of 120V power 2 Flashes...
Page 13 ELECTRONIC IGNITION 5 SEC Trial for Pre -Purge Ignitor Warm-up Blower “On”* Post Ignition Delay Purge DEMAND IGNITOR GAS VALVE INDOOR BLOWER *Blower on time will be 30 seconds after flame is sensed. Blower off time will depend on “OFF TIME” Setting. FIGURE 5 Fan Time Control - Ignition Control 103217-03 HEAT FAN OFF TIME IN SECONDS...
Page 14 HEATING COMPONENTS -01 to -04 Models Air Gas Plenum Burner Gasket Gas Valve Sensor Ignitor Orifice Housing Gas Orifice Air Orifice Intake Air Screen Thermal Intake Air Switch Elbow (location) FIGURE 7 Heating Components -05 and Later Models Air Gas Plenum Burner Gasket (replace)
Page 15 The switch is factory set and cannot be adjust- 9. Combustion Air Inducer (B6) ed. The switch may have a different set point for each unit model number. See Lennox Repair Parts Handbook if limit All EL180UHNE units use a combustion air inducer to switch must be replaced.
Page 16 10. Combustion Air Inducer Prove Switch (S18) COMBUSTION AIR PRESSURE SWITCH EL180UHNE series units are equipped with a combus- tion air pressure switch (FIGURE 9) located near the gas valve. The switch is connected to the combustion air inducer housing by means of a flexible silicone hose. It monitors negative air pressure in the intake air elbow.
Page 17 Replacing Pressure Switch Or Tubing -01 THROUGH -04 MODELS -05 MODELS FIGURE 10 Page 17...
Page 18 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 19 13. Blower Motor BLOWER WHEEL REPLACEMENT IMPORTANT Center Blower Wheel in Blower Housing Each blower is statically and dynamically balanced 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 control module both contained in the same motor housing.
Page 20 Multi−Meter (set to VAC) Multi−Met e (set to VA Test 3 (if necessary) "9A” NOTE- Ignition control illustration is typical Check for 120 volts across terminals “L1” and “Neutrals” on the "7A” integrated control. If voltage is present, problem is with the har ness.
Page 21 Replacing the Motor Module Motor Test NOTE - Not all motors have field replaceable control mod- ules. Only motors that utilize a 4 pin power connector and 5 pin signal connector as shown below may have replace- able controls. Motors that use a 3 pin power connector and 6 pin signal connector do not have field replaceable control modules.
Page 22 II- PLACEMENT AND INSTALLATION 9 - Replace the upper access panel. 10 - Turn on all electrical power to to the unit. Make sure unit is installed in accordance with installation instructions and applicable codes. 11 - Set the thermostat to desired setting. III- START-UP NOTE - When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas...
Page 23 Gas Leak Detector is strongly recommended. It Connect measuring device positive “+” to barbed is available through Lennox under part number 31B2001. fitting to measure manifold pressure. See FIGURE See Corp. 8411-L10, for further details.
Page 24 1 - Turn off the electrical power and gas supply to the TABLE 12 furnace. Manifold and Signal Pressure (inches w.c.) 2 - Remove the air hose fitting from the brass fitting on Manifold Manifold the air inlet screen. Altitude Unit Signal 3 - Use a 5/16”...
Page 25 Operating Signal Pressure Measurement -01 to -04 models FIGURE 22 TABLE 13 -01 Through -04 Models Production Resonance (more air) Difficulty Igniting (less air) Unit Orifice Size (Part No) Orifice Size Cat No Orifice Size Cat No -040 0.969 (08) 1.000 19X30 0.937...
Page 26 Troubleshooting Poor Ignition or Combustion Resonance Issues -01 to -04 Models Has the unit inducer RPM been reduced Contact your Service to 4300 RPM? Does not apply to -040 Representative for assistance unit Check Air Orifice See Figure 21 Check the following 1-Does the unit have the correct air orifice size? See table 13.
Page 27 Manifold Pressure , Signal Pressure, Combustion and 7 - Shut off unit and remove manometer and signal High Altitude Check meter after accurate readings has been obtained. Remove measurement hoses. Tighten the brass -05 and Later Models With SIT Gas Valve sealing screws loosened in step 2.
Page 28 System Operating Pressure Measurement -05 and later models System Operating Pressure FIGURE 24 Gas Manifold Measurement -05 and later models FIGURE 25 Page 28...
Page 29 Air Orifice Replacement -05 Models 5 - Remove the air orifice. Check the “Part” number stamped on the air orifice. See TABLE 18. If incorrect Do not replace the air orifice until the problem has been replace with proper air orifice. Repeat manifold determined.
Page 30 Troubleshooting Poor Ignition and Combustion Resonance Issues −05 and Later Models Is gas supply pressure Is the incoming voltage between 108V and 132V? between 5” and 14”wc Call a licensed plumber Call a licensed electrician Check Air Orifice or the gas comp. or the electric comp.
Page 31 H- Proper Ground and Voltage 2 - In addition, measure the AC voltage from Line Hot to Line Neutral (spade terminals) on the integrated A poorly grounded furnace can contribute to poor flame control. See FIGURE 28. This voltage should be in sense signal.
Page 32 V-TYPICAL OPERATING CHARACTERISTICS C-External Static Pressure 1 - Tap locations shown in FIGURE 30. A-Blower Operation and Adjustment 2 - Punch a 1/4” diameter hole in supply and return air NOTE- The following is a generalized procedure plenums. Insert manometer hose flush with inside and does not apply to all thermostat controls.
Page 33 At the beginning of each heating season, and to comply inspection procedure. This procedure can be viewed with the Lennox Limited Warranty, your system should be at www.ahrinet.org. See “Induced-draft Furnace Heat checked by a licensed professional technician (or equiva- Exchanger Inspection Procedure”.
Page 34 Cleaning the Heat Exchanger and Burners 12- 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 13- Reinstall the air fuel plenum and air intake assembly. furnace during cleaning.
Page 35 Heat Exchanger and Burner Assembly Removal (-01 to -04 Models) * Re-install screws per the numbered sequence shown Air Fuel Plenum Heat Exchanger Gasket *Air Fuel Plenum Gas Valve Burner Gasket Gasket (replace) Debri Screen Air Intake Assembly FIGURE 33 Heat Exchanger and Burner Removal (-05 and later models) Heat Exchanger Gaskets...
Page 36 VII- Wiring and Sequence of Operation / Troubleshooting EL180UHNE-060, -080, -100 Schematic Wiring Diagram Line voltage is applied to L1 and N. the T1 low voltage transformer is energized, and line voltage is applied to B3 indoor blower. 2 - S47 rollout switch(es) must be closed in order for 24V from transformer to be output on integrated control ”R” to power thermostat. 3 - When there is a call for heat, W1 of the thermostat energizes W of the furnace control with 24VAC.
Page 37 EL180UHNE-040 Schematic Wiring Diagram 1 - Line voltage is applied to L1 and N. the T1 low voltage transformer 6- A92 integrated control energizes R33 ignitor. A 20-second warm-up is energized, and line voltage is applied to B3 indoor blower. period begins 2 - S47 rollout switch(es) must be closed in order for 24V from 7 - GV1 gas valve opens for a 4-second trial for ignition...
Page 38 EL180UHNE040, 060, 080 -05 Models COMBUSTION AIR INDUCER COMBUSTION AIR PROVING SWITCH BLOWER SPEED CHART FACTORY CONNECTED SPEED TAPS UNIT COOL HEAT PARK 040,080 BLACK YELLOW BROWN,BLUE BLACK BLUE BROWN,YELLOW GAS VALVE BLOWER SPEED SELECTION PRIMARY GAS SPEED TAPS BLUE BLACK BROWN YELLOW...
Page 39 EL180UHNE0100 -05 Models COMBUSTION AIR INDUCER COMBUSTION AIR PROVING SWITCH BLOWER SPEED CHART FACTORY CONNECTED SPEED TAPS UNIT COOL HEAT PARK BLACK YELLOW BROWN,BLUE BLOWER SPEED SELECTION GAS VALVE PRIMARY GAS BLUE SPEED TAPS BLACK BROWN YELLOW LIMIT FLAME J159 SENSOR P159 FLAME ROLLOUT...
Page 40 Troubleshooting 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. IS POLARITY CORRECT? LED FLASHES CODE 2 - IMPROPER GROUND.
Page 41 HEATING SEQUENCE CONTINUED 15 SECOND COMBUSTION AIR INDUCER PREPURGE INITIATED BY CLOSED PRESSURE SWITCH. LED FLASHES CODE 13 - LOW LINE VOLTAGE. ONCE VOLTAGE IS IGNITOR WARM UP -- 20 SECONDS. IS VOLTAGE ABOVE 70 VOLTS? ABOVE 75 VOLTS, HEATING SEQUENCE RESTARTS.
Page 42 COOLING SEQUENCE OF OPERATION 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. LED FLASHES CODE 2 IMPROPER GROUND IS THERE A PROPER GROUND? CONTROL WILL CONTINUE TO CALL FOR COOLING...
Page 43 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.

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