Lennox SL280DF110V60C Unit Information
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Lennox SL280DF110V60C Unit Information

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See also: Instruction and Installation Manual
Service Literature
icomfort
SL280DFV 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. SL280DFV mod­
el units are equipped with the icomfort
two-stage variable speed integrated control. 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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Corp. 1117-L4
Revised 06-2016
®
ENABLED SL280DFV SERIES UNITS
®
®
enabled SureLight
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Page 1
SL280DFV
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.
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.
© 2016 Lennox Industries Inc.

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Summary of Contents for Lennox SL280DF110V60C

  • Page 1: Table Of Contents

    SL280DFV 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.

  • Page 2: Specifications

    SPECIFICATIONS Model No. SL280DF070V36A SL280DF090V48B SL280DF090V60C SL280DF110V60C Heating AFUE Performance High Input - Btuh 66,000 88,000 88,000 110,000 Fire Output - Btuh 52,000 69,000 70,000 87,000 Temperature rise range - °F 35-65 35-65 35-65 35-65 Gas Manifold Pressure (in. w.g.) 3.5 / 10.0...

  • Page 3: Parts Identification

    PARTS IDENTIFICATION BLOWER ASSEMBLY SECONDARY LIMIT GASKET FLUE CHASE CONTROL BOX (Includes two-stage integrated control, transformer and circuit breaker) INTERNAL FLUE PIPE ASSEMBLY DOOR INTERLOCK SWITCH PRIMARY LIMIT LOCATION ROLLOUT SWITCH HEAT EXCHANGER COMBUSTION AIR INDUCER PRESSURE SWITCHES COMBUSTION AIR INDUCER GAS VALVE INNER BLOWER ACCESS PANEL BURNER BOX ASSEMBLY...

  • Page 4: I Unit Components

    I-UNIT COMPONENTS CIRCUIT BREAKER CB8 Unit components are shown in figure 1. The gas valve, combustion air inducer and burners can be accessed by re­ moving the access panel. Electrical components are in the PRESS TO RESET control box (figure 2) found in the blower section. FIGURE 3 CAUTION WARNING...
  • Page 5 the combustion air inducer is energized on low (first stage) TABLE 1 heat speed. When the differential in the prove switch is ® SureLight Control 5 Pin Terminal Designation great enough, the prove switch closes and a 15-second PIN # Function pre-purge begins.
  • Page 6 INTEGRATED CONTROL HS/ CAI LINE 1 NEUTRAL 7 SEGMENT LED FLAME SENSE INDOOR BLOWER DIAGNOSTIC CONNECTOR PUSH BUTTON DIP SWITCHES 12 PIN LOW OUTDOOR AIR VOLTAGE SENSOR CONNECTOR TERMINALS DISCHARGE AIR W915 Y1 TO Y2 SENSOR 2 STAGE COMPR TERMINALS W951 R TO O HEAT PUMP TB83...
  • Page 7 INTEGRATED CONTROL CONFIGURATION GUIDE CLG BLOWER SPEED ADJUSTMENT 2ND STAGE HEAT ON DELAY DEFAULT 7 MIN CONTINUOUS FAN MODE BLOWER SPEED UPSTAGE THERMOSTAT SELECTION DELAY + 10% MEDIUM−LOW SPEED TWO STAGE (38%) THERMOSTAT 12 MIN UPSTAGE − 10% MEDIUM−HIGH DELAY SPEED 1−STAGE (70%)
  • Page 8 TABLE 4 Integrated Control Diagnostic Modes Display Action (when button released) No change (idle)* Remain in idle mode Solid “E” Enter diagnostic recall mode Solid “D” Discharge Air Installed Solid “F” Enter flame signal mode Solid “P” (variable speed only) Program unit capacity/size (Unit Code) * No change implies the display will continue to show whatever is currently being displayed for normal operation (blinking decimal, active error code, heat state, etc..)
  • Page 9 TABLE 5 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). Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5 second OFF) / cfm setting for current mode displayed.
  • Page 10 TABLE 5 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 124 Active communicating thermostat signal missing for more than 3 min­ Equipment lost communication with the thermostat. utes. Check four wiring connections, ohm wires and cycle power at the thermostat.
  • Page 11 TABLE 5 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 206 Gas valve second-stage relay failure Furnace will operate on 1 stage for remainder of the heating demand. Will clear after fault recovered. If unable to operate 2nd stage, replace control. E 207 Hot surface ignitor sensed open - Refer to troubleshooting.
  • Page 12 TABLE 5 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 271 Soft lockout - Exceeded maximum number of retries. Last retry failed due Check pressure (inches w.c.) of low pressure switch to the pressure switch opening. closing on heat call.
  • Page 13 TABLE 5 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 312 Restricted air flow in cooling or continuous fan mode is lower than cfm Warning Only. Restricted airflow - Indoor blower is setting. running at a reduced CFM (Cutback Mode - The variable speed motor has pre-set speed and torque limiters to protect the motor from damage caused by operating outside of design parameters...
  • Page 14 TABLE 5 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 406 LSOM - Compressor open start circuit. Required amount of current is not passing through Start current transformer. Clears the error after cur­ rent is sensed in START sensor, or after power re­ set.
  • Page 15 -10% to better suit the application. Table 8 below provides Ramping Option C S Motor runs at 100% until demand is satisfied. blower speed adjustments that will result from different switch settings. Refer to blower tables for corresponding S Once demand is met, motor runs at 100% for 45 sec­ cfm values.
  • Page 16 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 250 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 250 cfm. SL280DF070V36A BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 17 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 380 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 380 cfm. SL280DF090V48B BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 18 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm. SL280DF090V60C BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 19 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm. SL280DF110V60C BLOWER MOTOR WATTS (COOLING) Motor Watts @ Various External Static Pressures - in.
  • Page 20 On-Board Links damage. Refer to table 12 for operation sequence in ap­ Note: In icomfortt systems with a conventional outdoor plications including SL280DFV, a thermostat which fea­ tures humidity control and a single-speed outdoor unit. unit (non-communicating), the on-board clippable links Table 13 gives the operation sequence in applications with must be set to properly configure the system.
  • Page 21 TABLE 13 SL280DFV, Non-Communicating Thermostat with Humidity Control Feature and Two-Stage Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Thermostat Demand Relative Humidity Blower System Compres­ Comments Condition Y1 Y2 Status (COOL) NO CALL FOR DEHUMIDIFICATION Normal Operation - 60%, 65% Acceptable Compressor and indoor 70%*...
  • Page 22 DC filter capacitors inside the controller. If the discon­ nect switch is bounced when the disconnect is closed, the dis­ Earlier ECM motors used on other Lennox furnace models are not interchangeable with motors used on connect contacts may become welded. Try not to bounce the the SL280DF furnace line.
  • Page 23 Motor Start‐Up Troubleshooting Motor Operation When B3 begins start‐up, the motor gently vibrates back and To verify motor operation see steps below: forth for a moment. This is normal. During this time the elec­ 1- Remove J48 (5 pin power plug) from P48 on the mo­ tronic controller is determining the exact position of the rotor.
  • Page 24 BLOWER B3 HARNESS CONNECTORS BLOWER B3 HARNESS CONNECTORS P48 5 Pin SHAFT P48 5 Pin P49 4 Pin SHAFT P49 4 Pin MOTOR with INTEGRATED CONTROLLER MOTOR with INTEGRATED CONTROLLER J48 5 Pin J49 4 Pin P48 5 Pin P49 4 Pin J49 4 Pin Control Connector J48 5 Pin Line Voltage Connector J48 Connector...
  • Page 25 Troubleshooting Motor Windings TEST A Measure the resistance between each of the three motor Ensure that motor windings are not damaged by perform­ leads (3-pin plug) and the unpainted part of the end shield. ing the following tests: If the winding resistance to ground is <100k ohms, replace the motor and control module.
  • Page 26 The switch may have a different 24VAC terminals and gas control knob are located on the set point for each unit model number. See Lennox Repair valve. A wire harness connects the terminals from the gas Parts Handbook if limit switch must be replaced, valve to the electronic ignition control.
  • Page 27 SL280DFV HEATING COMPONENTS Rollout Switch (alternate location) Ignitor Burners Rollout Switch Sensor Gas Valve and Manifold Assembly Sight Glass FIGURE 13 Page 27...
  • Page 28 SL280DF Ignitor Check Out Multi−Meter (set to ohms) Test 1 Test 1 Integrated Control Board Detail Remove 5-pin plug from control Check ohms reading across terminals 1and 5 Ohm value should be between 39 - 70. Multi−Meter (set to ohms) Test 2 Seperate the 2-pin jack plug near the manifold and check resistance of the ignitor.

  • Page 29: Installation

    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 30 3 - Turn off all electrical power to the unit. 8 - Turn switch on gas valve to ON. Do not force. See fig­ ure 16 or 17. 4 - This furnace is equipped with an ignition device which 9 - Replace the upper access panel. automatically lights the burners.

  • Page 31: Heating System Service Checks

    Use of a specialty Gas Leak Detector is strongly recommended. It is available A-CSA Certification through Lennox under part number 31B2001. See Corp. All units are CSA design certified without modifications. 8411-L10, for further details.
  • Page 32 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.
  • Page 33 Table 20 Manifold Pressure Settings Manifold Manifold Manifold Supply Line Orifice Size Pressure in.wg. Pressure in.wg. Pressure in.wg. Pressure Unit Orifice Size 7501 - 0-4500 ft. 4501-7500 ft. 7501 - 10,000 ft. in. w.g. Input 0 - 7500 ft. 10,000 ft. High High High...

  • Page 34: Typical Operating Characteristics

    At the beginning of each heating season, and to comply blower will run continuously at approximately 38% of with the Lennox Limited Warranty, your system should the second-stage cooling speed when there is no cool­ be checked by a licensed professional technician (or equiv­...
  • Page 35 6- Check the cleanliness of blower assembly and clean 12 Check the condition of the furnace cabinet insulation the housing, blower wheel and blower motor if neces­ and repair if necessary. sary The blower motors are prelubricated for extended 13 Perform a complete combustion analysis during the fur­ bearing life.
  • Page 36 A-Heat Exchanger and Burners 5 - Remove the collector box located behind the combus­ tion air inducer. Be careful with the collector box gas­ Cleaning the Heat Exchanger and Burners ket. If the gasket is damaged, it must be replaced to NOTE - Use papers or protective covering in front of the fur­...
  • Page 37 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.

  • Page 38: Wiring And Sequence Of Operation

    VII- Wiring and Sequence of Operation SL280DFV Schematic Wiring Diagram Integrated Control Self Check WARNING When there is a call for heat, the icomfortt enabled inte­ Electric Shock Hazard. Can cause grated control runs a self check. The control checks for S10 injury or death.
  • Page 39 8 - When the thermostat demand for low-fire (first stage) CAUTION heat is satisfied, the gas valve is de-energized and the field-selected indoor blower off delay begins. The Failure to use properly sized wiring and circuit combustion air inducer begins a 5-second post-purge breaker may result in property damage.
  • Page 40 ® ® icomfort Wi-Fi Thermostat with SL280DFV icomfort Wi-Fi Thermostat with SL280DFV and Non-Communicating Outdoor Unit and icomfortt-ENABLED Outdoor Unit ® ® icomfort Wi-Fi Thermostat icomfort Wi-Fi Thermostat icomfortt-Enabled SL280DFV Indoor Furnace icomfortt-Enabled SL280DFV Indoor Furnace Non-Communicating Outdoor Air Conditioner icomfortt-Enabled Outdoor Air Conditioner or Heat Pump icomfortt- ENABLED...
  • Page 41 ® Optional Accessories for use with any icomfort Touch System ® NOTE: icomfort Wi-Fi THERMOSTAT SENSES HUMIDITY & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER 120V CONNECTIONS BASED ON DEMAND. NO OTHER CONTROL OR HUMIDIS­ TAT REQUIRED. “HUM” CONTACT IS CLOSED ANYTIME OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HU­...

  • Page 42: Program Unit Capacity Size Mode

    FURNACE MODEL SL280DF070V36A SL280DF090V48B SL280DF090V60C Solid starts SL280DF110V60C blinking 7-Segment LED When the correct unit size code is displayed, release Push and hold button. Integrated control will button. Selected code will flash for 10-second period. display unit size code number for each During that period, press and hold push button for 5 furnace model for three seconds.

  • Page 43: Field Wiring And Jumper Settings

    IX- SL280 Field Wiring Applications With Conventional Thermostat 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 OUTDOOR T'STAT...
  • Page 44 SL280 Field Wiring Applications With Conventional Thermostat 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 45 SL280 Field Wiring Applications With Conventional Thermostat 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 46 SL280 Field Wiring Applications With Conventional Thermostat 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 47: Troubleshooting Flow Chart

    X- Troubleshooting Troubleshooting: Heating Sequence of Operation CALL FOR FIRST-STAGE HEAT CALL FOR 1ST STAGE HEAT (LOW FIRE) INDOOR BLOWER OFF AFTER HEAT FAN OFF DELAY (LOW HEAT SPEED) INDOOR LIMIT BLOWER OFF HIGH ERROR WATCHGUARD − SWITCH INDOOR AFTER HEAT FAN LIMIT SWITCH CODE ERROR CODE...
  • Page 48 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR SECOND-STAGE HEAT CALL FOR 2ND STAGE HEAT (HIGH FIRE) SINGLE STAGE 2 STAGE THERMOSTAT THERMOSTAT 2ND STAGE RECOGNITION DELAY ON DELAY (30 SECONDS) EXPIRED? ONLY FOR 1ST EXPIRED? REQUEST FOR 2ND STAGE HEAT INDUCER SWITCHED TO HIGH SPEED HIGH...
  • Page 49 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR HEAT SATISFIED FIRST-STAGE HEAT SECOND-STAGE HEAT RUN MODE: 1ST OR 2ND STAGE CALL FOR HEAT. ALL INPUTS MONITORED (LIMIT, PRESSURE, CALL FOR HEAT/COOL, FLAME LEVEL) 2ND STAGE HEAT 2ND STAGE CALL FOR HEAT SATISFIED? DE−ENERGIZE 2ND STAGE GAS VALVE...
  • Page 50 Troubleshooting: Cooling Sequence of Operation (Continued) CALL FOR COOLING 1ST STAGE COOLING REQUEST RECEIVED WAIT FOR COMPRESSOR TIMED OFF DELAY TO EXPIRE ENERGIZE 1ST STAGE COOLING CONTACTOR (COMPRESSOR & FAN) INDOOR BLOWER 2 SECOND ON DELAY ENERGIZE INDOOR BLOWER (LOW COOLING MODE) MAINTAIN INDOOR BLOWER (LOW COOLING MODE)
  • Page 51 Troubleshooting: Continuous Fan Sequence of Operation CALL FOR FAN CALL FOR FAN INDOOR BLOWER ON CONTINUOUS FAN SPEED CALL FOR FAN MAINTAIN INDOOR REMOVED? BLOWER AT CONTINUOUS FAN REQUEST MAINTAIN INDOOR FOR COOLING GO TO CALL FOR COOLING BLOWER AT RECEIVED? CONTINUOUS FAN REQUEST...

This manual is also suitable for:

Sl280df070v36aSl280df090v48bSl280df090v60c

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