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Lennox EL280UHE Series Unit Information
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Lennox EL280UHE Series Unit Information

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Service Literature
EL280UHE(X) series units are 80% efficiency gas furnaces
used for upflow or horizontal applications only, manufac­
tured with Lennox Duralokt heat exchangers formed of
aluminized steel. EL280UHE(X) units are available in heat­
ing capacities of 44,000 to 110,000 Btuh and cooling ap­
plications up to 5 tons. Product Specifications manual for
proper sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LPG operation. EL280UHE(X)
model units are equipped with the SureLight
tegrated control. EL280UHE(X) unit meets the California Ni­
trogen Oxides (NO
) Standards and California Seasonal Ef­
x
ficiency requirements. All units use a redundant 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 recommendations only and do not consti­
tute code.
TABLE OF CONTENTS
Specifications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Data
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components
. . . . . . . . . . . . . . . . . . . . . . . .
II Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
III Start Up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Heating System Service Checks
V Typical Operating Characteristics
VI Maintenance
. . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation
VIII Field Wiring and DIP Switch Settings
IX Troubleshooting
. . . . . . . . . . . . . . . . . . . . . . .
Corp. 1901-L1
EL280UHE(X) SERIES UNITS
®
two-stage in­
Page 2
Page 5
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Page 1
EL280UHE(X)
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.
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.
© 2019 Lennox Industries Inc.

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Summary of Contents for Lennox EL280UHE Series

  • Page 1 EL280UHE(X) series units are 80% efficiency gas furnaces used for upflow or horizontal applications only, manufac­ tured with Lennox Duralokt heat exchangers formed of aluminized steel. EL280UHE(X) units are available in heat­ ing capacities of 44,000 to 110,000 Btuh and cooling ap­...
  • Page 2 SPECIFICATIONS Model No. EL280UH045E36A EL280UH070E36A Heating Model No. - Low Nox - - - EL280UH070XE36A Performance AHRI Ref. No. Non “X” Models “X” Models AFUE High Input - Btuh 44,000 66,000 Fire Output - Btuh 35,000 53,000 Temperature rise range - °F 30 - 60 30 - 60 Gas Manifold Pressure (in.
  • Page 3 SPECIFICATIONS Model No. EL280UH110E48C EL280UH110E60C Heating Model No. - Low Nox - - - EL280UH110XE60C Performance AHRI Ref. No. Non “X” Models “X” Models AFUE High Input - Btuh 110,000 110,000 Fire Output - Btuh 86,000 87,000 Temperature rise range - °F 35 - 65 30 - 60 Gas Manifold Pressure (in.
  • Page 4 OPTIONAL ACCESSORIES - ORDER SEPARATELY “A” Width “B” Width “C” Width Models Models Models CABINET Horizontal Suspension Kit - Horizontal only 51W10 51W10 51W10 Return Air Base - Upflow only 65W75 50W98 50W99 High Performance Economizer (Commerical only) 10U53 10U53 10U53 controls iComfort...
  • Page 5 BLOWER DATA EL280UH045E36A 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 1500 1220 1050 0.10 1485 1200 1025 0.20 1460 1170 0.30 1420 1140 0.40...
  • Page 6 BLOWER DATA EL280UH090E48B 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 1800 1555 1425 1370 1240 0.10 1765 1525 1390 1320 1190 0.20 1725 1485...
  • Page 7 EL280UHE(X) Parts Arrangement Make Up Box Heat Exchanger Combustion Air Inducer Combustion Air Pressure Switch Gas Valve and Manifold Assembly Collector Box Indoor Blower and Motor Assembly (installed in cabinet) Limit Switch (under collector box) Constant Torque Indoor Blower Motor (removed from cabinet) Two-Stage Integrated Control FIGURE 1...
  • Page 8 I-UNIT COMPONENTS 3. Circuit Breaker (CB8) A 24V circuit breaker is also located in the control box. The switch provides overcurrent protection to the trans­ EL280UHE(X) unit components are shown in figure 1. The former (T1). The breaker is rated 3A at 32V. If the current gas valve, combustion air inducer and burners can be ac­...
  • Page 9 ® After the 15-second pre-purge period, the SureLight igni­ TABLE 1 tor warms up for 20 seconds after which the gas valve ® SureLight Control 5 Pin Terminal Designation opens for a 4-second trial for ignition. The ignitor remains PIN # Function energized during the trial until flame is sensed.
  • Page 10 INTEGRATED CONTROL 24VAC Indoor Blower Terminals Ignitor and Combustion Air Inducer Neutrals Flame Sense S4 DIP Switches Diagnostic Push Button On Board Links THERMOSTAT CONNECTIONS (TB1) 3/16” QUICK CONNECT TERMINALS DS = DEHUMIDIFICATION SIGNAL FLAME SENSE SIGNAL W2 = HEAT DEMAND FROM 2ND STAGE T/STAT HI COOL 24VAC W1 = HEAT DEMAND FROM 1ST STAGE T/STAT HI HEAT 24VAC...
  • Page 11 INTEGRATED CONTROL CONFIGURATION GUIDE 2ND STAGE HEAT ON DELAY 7 MIN UPSTAGE THERMOSTAT SELECTION DELAY COOLING BLOWER-OFF DELAY TWO STAGE THERMOSTAT 12 MIN UPSTAGE *45 SECOND COOL BLOWER DELAY 1−STAGE OFF DELAY THERMOSTAT (TIMED STAGING) −SEE SW #2 HSI/CAI 2 SECOND COOL BLOWER HEATING BLOWER−OFF DELAY OFF DELAY...
  • Page 12 TABLE 3 Integrated Control Diagnostic Modes Display Action (when button released) No change (idle)* Remain in idle mode Solid “E” Enter diagnostic recall mode Solid “F” Enter flame signal mode TABLE 4 Integrated Diagnostic Codes/Status of Equipment I. Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover Idle mode (Decimal blinks at 1 Hertz -- 0.5 second ON, 0.5 second OFF).
  • Page 13 TABLE 4 Continued E 125 Control failed self-check, internal error, failed hardware. Will restart if Hardware problem on the control. Cycle power on error control. Replace if problem prevents service and is recovers. Integrated control not communicating. Covers hardware errors persistent.
  • Page 14 TABLE 4 Continued E 270 Soft lockout - Exceeded maximum number of retries. No flame current Check for proper gas flow. Ensure that ignitor is sensed. lighting burner. Check flame sensor current. Clears when heat call finishes successfully. Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 271 Soft lockout - Exceeded maximum number of retries.
  • Page 15 Integrated Control DIP Switches TABLE 5 Blower Off Heating Mode Delay Switch Settings EL280UHE(X) units are equipped with a two-stage inte­ Blower Off Delay grated control. This control manages ignition timing, heat­ Switch 3 Switch 4 (Seconds) ing mode fan off delays and indoor blower speeds based on selections made using the control dip switches and jump­...
  • Page 16 B- Indoor Blower 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. EL280UHE(X) 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 17 Multi−Meter (set to VAC) Multi−Meter (set to VAC) Test 1 Test 3 (if necessary) Turn on power to unit. Check for 120 volts across terminals Check for 120 volts across terminals “L1” and “Neutrals” on “L” and “N” on input plug P48. If voltage is present continue the integrated control.
  • Page 18 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 9. Unplug the Two Harness Connection TWO HARNESS FIGURE 11 CONNECTIONS TABLE 8 MOTOR...
  • Page 19 The switch may have a different LPG change over kits are available from Lennox. Kits include set point for each unit model number. See Lennox Repair burner orifices.
  • Page 20 EL280UHE(X) HEATING COMPONENTS Ignitor Burners Rollout Switches Sensor Gas Valve Gas Orifices FIGURE 13 Page 20...
  • Page 21 To Measure Flame Signal - Integrated Control: 6 - Turn supply voltage on and close thermostat contacts to cycle system. Use a digital readout meter capable of reading DC micro­ 7 - When main burners are in operation for two minutes, take amps.
  • Page 22 EL280UHE(X) Ignitor Check Out Test 1 Checking resistance of ignitor circuit Remove 5-pin plug from integrated control. Check Ohms reading across terminal 1 and 5. Reading should be between 39 and 70 ohms. If value is correct, this is the only test needed. If the meter reading is not correct (”0”...
  • Page 23 A bleed port on the switch allows relatively dry air in NOTE - Each furnace model uses a unique CAI. Refer to the vestibule to purge switch tubing, to prevent condensate Lennox Repair Parts listing for correct inducer for replace­ build up. ment.
  • Page 24 Multiple Venting screws, rotate the combustion air inducer and gasket (pressure switch should be above the combustion air in­ The EL280UHE(X) furnace can vent in multiple positions. ducer in all positions), then reinstall the mounting screws. See figure 17. See unit Installation Instructions for more detail. The make up box may be removed and the combustion air IMPORTANT inducer may be rotated clockwise or counterclockwise 90°...
  • Page 25 II-PLACEMENT AND INSTALLATION NOTE - When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line. Make sure unit is installed in accordance with installation instructions and applicable codes. Turning Off Gas To Unit III-START‐UP 1 - Set thermostat to lowest setting.
  • Page 26 Use of a specialty appliances connected to meter. Gas Leak Detector is strongly recommended. It is available TABLE 12 through Lennox under part number 31B2001. See Corp. GAS METER CLOCKING CHART 8411-L10, for further details. Seconds for One Revolution...
  • Page 27 G- Proper Combustion H- High Altitude The manifold pressure may require adjustment and com­ Furnace should operate minimum 15 minutes with correct bustion air pressure switch may need replacing to ensure manifold pressure and gas flow rate before checking com­ bustion.
  • Page 28 I- Proper Ground and Voltage 2 - In addition, measure the AC voltage from Line Hot to Line Neutral (spade terminals) on the integrated con­ Furnace must be properly grounded for proper perform­ trol. See figure 20. This voltage should be in the range ance.
  • Page 29 V-TYPICAL OPERATING CHARACTERISTICS C-External Static Pressure A-Blower Operation and Adjustment 1 - Tap locations shown in figure 22. 1 - Blower operation is dependent on thermostat control 2 - Punch a 1/4” diameter hole in supply and return air ple­ system.
  • Page 30 At the beginning of each heating season, and to comply 9- Ensure sufficient combustion air is available to the fur­ with the Lennox Limited Warranty, your system should be nace. Fresh air grilles and louvers (on the unit and in the checked by a licensed professional technician (or equiva­...
  • Page 31 Cleaning the Heat Exchanger and Burners 9 - Remove screws from both sides, top and bottom of vestibule panel. NOTE - Use papers or protective covering in front of the fur­ 10 -Remove heat exchanger. It may be necessary to nace during cleaning.
  • Page 32 EL280UHE(X) BURNER, COMBUSTION AIR INDUCER ASSEMBLY & HEAT EXCHANGER REMOVAL Gasket Pressure Switch Flue Transition Collector Box Heat Exchanger Ignitor Orifice Plate Combustion Air Inducer Retention Rings Rollout Switches Sensor Cross Over Manifold And Gas Valve FIGURE 23 EL280UHE(X) NOx INSERTS NOx Insert FIGURE 24 Page 32...
  • Page 33 18 -Reconnect all wires. Remove 5 screws if necessary (either side of cabinet) 19 -Reconnect top cap and vent pipe to combustion air in­ ducer outlet. 20 -Reconnect gas supply piping. 21 -Turn on power and gas supply to unit. 22 -Set thermostat and check for proper operation.
  • Page 34 VII- Wiring and Sequence of Operation Page 34...
  • Page 35 Electronic Ignition When the delay ends, the indoor blower motor is ener­ gized on the low fire heating speed, the HUM contacts The two-stage integrated control used in EL280UHE(X) close energizing the humidifier and 120V ACC termi­ units has an added feature of an internal Watchguard con­ nal is energized.
  • Page 36 Applications Using A Single-Stage Thermostat 4 - After the 20-second warm-up period has ended, the gas See figure 27 for ignition control sequence valve is energized on low fire (first stage) and ignition oc­ curs. At the same time, the control module sends a sig­ B - Heating Sequence -- Integrated Control Thermostat nal to begin an indoor blower 30-second ON-delay.
  • Page 37 VIII- Field Wiring and DIP Switch Settings TABLE 17 EL280UHE Field Wiring Applications DIP Switch Settings and On-Board Links (See figure 4) DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 1 Heat / 1 Cool FURNACE...
  • Page 38 TABLE 17 EL280UHE Field Wiring Applications (Continued) DIP Switch Settings and On-Board Links (See figure 4) DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 2 Heat / 2 Cool FURNACE OUTDOOR T'STAT...
  • Page 39 TABLE 17 EL280UHE Field Wiring Applications (Continued) DIP Switch Settings and On-Board Links (figure 4) DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7724U TERM.
  • Page 40 TABLE 17 EL280UHE Field Wiring Applications (Continued) DIP Switch Settings and On-Board Links (figure 4) DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7742U TERM.
  • Page 41 IX- Troubleshooting Troubleshooting: Heating Sequence of Operation HEATING SEQUENCE OF OPERATION NORMAL AND ABNORMAL HEATING MODE POWER ON GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF. (RESET CONTROL BY CONTROL SELF-CHECK OKAY? TURNING MAIN POWER OFF.) POLARITY REVERSED. POLARITY OKAY? STATUS ERROR CODE 5 + 4.
  • Page 42 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT STATUS LED - HEARTBEAT. (Refer to box A on previous page) GAS VALVE OFF. COMBUSTION AIR INDUCER FIRST-STAGE (LOW FIRE) PRESSURE OFF. INDOOR BLOWER OFF. UNIT WILL RETRY SWITCH CLOSED WITHIN 2.5 MINUTES? AFTER 5-MINUTE WAIT PERIOD.
  • Page 43 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT. STATUS LED -- HEARTBEAT. SEE BOX A. FLAME SIGNAL ABOVE (u1.40 microamps) LOW FLAME SIGNAL (Does not affect control operation) STATUS ERROR CODE 1 + 2. SINGLE-STAGE THERMOSTAT MODE TWO STAGE THERMOSTAT MODE (DIP SWITCH SET AT “ON”)
  • Page 44 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION CONTINUED SEE BOX A NORMAL OPERATION. SEE BOX B THERMOSTAT CALLS FOR HEAT. RETURN TO FIRST-STAGE HEAT MODE. FIRST-STAGE CONTINUES UNTIL SECOND- STAGE PRESSURE SWITCH CAN BE PROVEN SECOND-STAGE (HIGH FIRE) HEAT or HEAT DEMAND IS SATISFIED.
  • Page 45 Troubleshooting: Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION POWER ON SIGNAL POLARITY REVERSED. CONTROL WILL CONTINUE TO CALL FOR COOLING IS POLARITY REVERSED? IN THIS CONDITION. STATUS ERROR CODE 5 + 4. SIGNAL IMPROPER GROUND AT LED. CONTROL WILL CONTINUE TO CALL FOR COOLING IS THERE IN THIS CONDITION.
  • Page 46 Troubleshooting: Continuous Fan Sequence of Operation CONTINUOUS LOW SPEED FAN SEQUENCE OF OPERATION MANUAL FAN SELECTION MADE AT THERMOSTAT. AFTER 2 SECOND DELAY, INDOOR BLOWER IS ENERGIZED ON CONTINUOUS FAN SPEED. THERMOSTAT CALLS FOR FIRST STAGE COOL. THERMOSTAT CALLS FOR FIRST-STAGE HEAT. INDOOR BLOWER RAMPS TO FIRST STAGE AFTER 45-SECOND DELAY, INDOOR BLOWER COOLING SPEED AFTER A 2-SECOND DELAY.

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