Lennox EL280DF Series Unit Information
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- Installation instructions manual (32 pages) ,
- User's information manual (7 pages)
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Service Literature
EL280DF series units are 80% efficiency gas furnaces
used for downflow applications only, manufactured with
Lennox Duralokt heat exchangers formed of aluminized
steel. Units are available in heating capacities of 66,000 to
110,000 Btuh and cooling applications up to 5 tons. Refer to
Engineering Handbook for proper sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LPG operation. EL280DF model
units are equipped with the SureLight
All units use a redundant gas valve to assure safety shut-off
as required by CSA.
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
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II Installation
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IX Troubleshooting Flow Chart
Revised 06/2016
EL280DF SERIES UNITS
®
integrated control.
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Corp. 1139-L11
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.
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.
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.
Page 1
EL280DF
WARNING
WARNING
CAUTION
© 2016 Lennox Industries Inc.
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Table of Contents
Related Manuals for Lennox EL280DF Series
Summary of Contents for Lennox EL280DF Series
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Page 1: Table Of Contents
Corp. 1139-L11 Service Literature Revised 06/2016 EL280DF SERIES UNITS EL280DF series units are 80% efficiency gas furnaces used for downflow applications only, manufactured with Lennox Duralokt heat exchangers formed of aluminized steel. Units are available in heating capacities of 66,000 to 110,000 Btuh and cooling applications up to 5 tons. -
Page 2: Specifications
SPECIFICATIONS Model No. EL280DF070P36A EL280DF090P48B EL280DF110P60C Heating AFUE Performance High Input - Btuh 66,000 88,000 110,000 Fire Output - Btuh 52,000 69,000 87,000 Temperature rise range - °F 30 - 60 35 - 65 40 - 70 Gas Manifold Pressure (in. w.g.) 3.5 / 10.0 3.5 / 10.0 3.5 / 10.0... -
Page 3: Blower Performance Data
BLOWER DATA EL280DF070P36A PERFORMANCE (Less Filter) EL280DF090P48B PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds Air Volume / Watts at Various Blower Speeds External External Static Medium- Medium- Static Medium- Medium- High High Pressure High Pressure High in. -
Page 4: Parts Identification
PARTS IDENTIFICATION Top Cap Secondary Limit Indoor Blower Control Box (includes integrated control, transformer and door switch) Internal Flue Pipe Assembly Heat Exchanger Combustion Air Inducer Burner Box Assembly Primary Limit Gas Val Access Panel FIGURE 1 Page 4... -
Page 5: I Unit Components
Electrostatic discharge can affect elec tronic components. Take precautions 4. SureLight Integrated Control (A92) to neutralize electrostatic charge by EL280DF units are equipped with the Lennox two-stage in touching your hand and tools to metal ® tegrated SureLight control. The system consists of a igni... - Page 6 After the 15-second pre-purge period, the SureLight ignitor Switch 2 -- Second Stage Delay (Used with Single- warms up for 20 seconds after which the gas valve opens Stage Thermostat Only) -- This switch is used to deter for a 4-second trial for ignition. The ignitor energizes during mine the second stage on delay when a single-stage ther...
- Page 7 DIAGNOSTIC LEDs THERMOSTAT CONNECTIONS (TB1) SWITCHES ON-BOARD LINKS 1= ERROR CODE RECALL H= 24V HUMIDIFIER OUTPUT L= LENNOX SYSTEM OPERATION MONITOR DIP SWITCH FUNCTIONS W915 DIP SWITCH(ES) FUNCTION 1 -- 2 Stage T'stat Selects t/stat type (single or two-stage) W951...
- Page 8 INTEGRATED CONTROL FIGURE 6 Page 8...
- Page 9 TABLE 4 FLASH CODE STATUS / ERROR DESCRIPTION (X + Y) FLASH CODE DESCRIPTIONS Pulse A 1/4 second flash followed by four seconds of off time. Heartbeat Constant 1/2 second bright and 1/2 second dim cycles. LED flashes X times at 2Hz, remains off for two seconds, flashes Y times at 2Hz, remains off for four X + Y seconds, then repeats.
- Page 10 See SPECIFICATIONS section for motor regulator adjustment screw is located on the valve. specifications. LPG change over kits are available from Lennox. Kits in 2. Secondary Limit Control (S21) clude burner orifices. The secondary limit (S21) is located in the blower compart...
- Page 11 EL280DF HEATING COMPONENTS Ignitor Burners Rollout Switch Sensor Gas Valve Manifold and Gas Orifices FIGURE 7 Page 11...
- Page 12 Multi−Meter EL280DF Ignitor Check Out (set to ohms) Test 1 Integrated Control Board Detail 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.
- Page 13 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, amps.
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Page 14: Start Up
NOTE - Each furnace model uses a unique CAI. Refer COMBUSTION AIR PRESSURE SWITCH to Lennox Repair Parts listing for correct inducer for re placement. A pressure switch connected to the combustion air inducer orifice plate is used to prove inducer operation. - Page 15 3 - Turn off all electrical power to the unit. Turning Off Gas To Unit 1 - Set thermostat to lowest setting. 4 - This furnace is equipped with an ignition device which 2 - Turn off all electrical power to unit if service is to be per automatically lights the burners.
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Page 16: Heating System Service Checks
Refer to the EL280DF Installation Instruction. Gas Leak Detector is strongly recommended. It is available B-Gas Piping through Lennox under part number 31B2001. See Corp. 8411-L10, for further details. CAUTION Do not use matches, candles, flame or any other source of ignition to check for gas leaks. - Page 17 F- Proper Gas Flow (Approximate) IMPORTANT Furnace should operate at least 5 minutes before check ing gas flow. Determine time in seconds for two revolu For safety, shut unit off and remove manometer as soon as an accurate reading has been obtained. tions of gas through the meter.
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Page 18: Typical Operating Characteristics
V-TYPICAL OPERATING CHARACTERISTICS C-External Static Pressure A-Blower Operation and Adjustment 1 - Tap locations shown in figure 14. 1 - Blower operation is dependent on thermostat control 2 - Punch a 1/4” diameter hole in supply and return air ple system. -
Page 19: Maintenance
At the beginning of each heating season, and to comply sized, open and unobstructed to provide combustion with the Lennox Limited Warranty, your system should be checked by a licensed professional technician (or equiv alent) as follows:... - Page 20 Cleaning the Heat Exchanger and Burners 5 - Remove the collector box located behind the combus tion air inducer. Be careful with the collector box gas NOTE - Use papers or protective covering in front of the fur ket. If the gasket is damaged, it must be replaced to nace during cleaning.
- Page 21 10- Back wash using steam. Begin from the burner open 22- If a leak is detected, shut gas and electricity off and re ing on each clam. Steam must not exceed 275°F. pair leak. 11- To clean burners, run a vacuum cleaner with a soft brush attachment over the face of burners.
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Page 22: Wiring And Sequence Of Operation
VII- Wiring and Sequence of Operation EL280DF Schematic Wiring Diagram Page 22... - Page 23 Integrated Control Self Check Single-Stage Thermostat, Two Stage Heat. Dip Switch set at “ON” When there is a call for heat, the integrated control runs a 1- SureLight control energizes combustion air inducer B6 self check. The control checks for S10 primary limit, S21 on low heat speed.
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Page 24: Field Wiring And Dip Switch Settings
VIII- Field Wiring and DIP Switch Settings TABLE 12 Field Wiring Applications DIP Switch Settings and On-Board Links (See figure 6) W915 Thermostat W951 Wiring Connections Two-Stage DIP Switch 1 Cooling Heat Pumps 1 Heat / 1 Cool Intact Intact CONTROL OUTDOOR T'STAT... - Page 25 TABLE 12 Field Wiring Applications (Continued) DIP Switch Settings and On-Board Links (See figure 6) W915 Thermostat Wiring Connections Two-Stage W951 DIP Switch 1 Cooling Heat Pumps 2 Heat / 2 Cool Intact CONTROL OUTDOOR T'STAT TERM. STRIP UNIT 2 Heat / 1 Cool Intact Intact CONTROL...
- Page 26 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 27 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 28 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 29 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 30 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 31 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.