Lennox EL297DFV Series Unit Information
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Lennox EL297DFV Series Unit Information

Lennox EL297DFV Series Unit Information

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S e r v i c e L i t e r a t u r e
Communicating-Enabled EL297DFV SERIES UNITS
EL297DFV(X) series units are 90% efficiency gas furnac-
es used for upflow or horizontal applications only, man-
ufactured with Lennox Duralok heat exchangers formed
of aluminized steel. EL297DFV(X) units are available in
heating capacities of 44,000 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. EL297D-
FV(X) model units are equipped with a communicating
enabled SureLight
two-stage variable speed integrated
®
control.
EL297DFV(X) unit meets the California Nitrogen Oxides
(NOx) Standards and California Seasonal Efficiency re-
quirements. 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.
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 (ex-
cept where noted) are recommendations only and do not
constitute code.

TABLE OF CONTENTS

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . . Page 9
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 39
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 60
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 64
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . Page 86
UNIT INFORMATION
UNIT INFORMATION
100089
Page 1
WARNING
Improper
installation,
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.
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.
EL297DFV
adjustment,
alteration,
©2016 Lennox Industries, Inc.

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Summary of Contents for Lennox EL297DFV Series

  • Page 1: Table Of Contents

    EL297DFV(X) series units are 90% efficiency gas furnac- es used for upflow or horizontal applications only, man- ufactured with Lennox Duralok heat exchangers formed of aluminized steel. EL297DFV(X) units are available in heating capacities of 44,000 to 110,000 Btuh and cooling applications up to 5 tons.

  • Page 2: Specifications

    SP ECIF ICATIONS Model No. EL297DF045XV36B EL297DF070XV48B EL297DF090XV60CEL297DF110XV60C Heating AFUE Performance High Input - Btuh 44,000 66,000 88,000 110,000 Fire Output - Btuh 43,000 64,000 86,000 108,000 Temperature rise range - °F 35-65 35-65 40-70 45-75 Gas Manifold Pressure (in. w.g.) 3.5 / 10.0 3.5 / 10.0 3.5 / 10.0...
  • Page 3 ⁴ Left Side Vent Kit 87W73 87W73 2 or 3 in. Optional for service diagnostics. Remote Outdoor Temperature Sensor is used with conventional (non-Lennox Communicating) outdoor units (sensor is furnished with Lennox Communicating ® ® outdoor units). Allows the thermostat to display outdoor temperature. Required in dual-fuel and EDA applications.
  • Page 4 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28% and 38% of the selected second stage cooling speed - minimum 250 cfm. Lennox Smart Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 5 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28% and 38% of the selected second stage cooling speed - minimum 380 cfm. Lennox Smart Zoning System Applications - Minimum blower speed is 380 cfm.
  • Page 6 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28% and 38% of the selected second stage cooling speed - minimum 450 cfm. Lennox Smart Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 7 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28% and 38% of the selected second stage cooling speed - minimum 450 cfm. Lennox Smart Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 8 PARTS IDENTIFICATION CONTROL BOX (Includes integrated control, transformer and door switch) VARIABLE SPEED MOTOR (hidden) BAG ASSEMBLY (shipping location) COMBUSTION AIR INDUCER BLOWER DECK DuralokPlus HEAT EXCHANGER ASSEMBLY OUTER ACCESS PANEL COLD END HEADER BOX COMBUSTION AIR INDUCER PRESSURE SWITCH PRIMARY LIMIT BURNER BOX ASSEMBLY (includes sensor, rollout switches and ignitor)

  • Page 9: I Unit Components

    I-UNIT COMPONENTS CIRCUIT BREAKER CB8 EL297DFV(X) unit components are shown in FIGURE 1. The gas valve, combustion air inducer and burners can be accessed by removing the access panel. Electrical com- PRESS TO RESET ponents are in the control box (FIGURE 2) found in the blower section.
  • Page 10 NOTE - During abnormal conditions such as low supply TABLE 1 voltage or low outdoor temperatures and the low fire pres- SureLight Control 5 Pin Terminal Designation ® sure switch does not close, the combustion air inducer will Pin # Function switch to high fire.
  • Page 11 Ignition Control 107045-XX IGNITION CONTROL LINE 1 IGNITOR / CAI NEUTRAL FLAME SENSE TB82 TB84 RS-BUS LINK (TB82, future use) THERMOSTAT CONNECTIONS (TB1) DS = DEHUMIDIFICATION SIGNAL I+ = DATA HIGH CONNECTION W2 = HEAT DEMAND FROM 2ND STAGE T/STAT I - = DATA LOW CONNECTION R = 24VAC W1 = HEAT DEMAND FROM 1ST STAGE T/STAT...
  • Page 12 INTEGRATED CONTROL CONFIGURATION GUIDE TYPICAL 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 − 10% UPSTAGE MEDIUM−HIGH DELAY SPEED 1−STAGE...
  • Page 13 Ignition 107045-XX Control Diagnostic Modes Display Action (when button is released) No change (idle)* Remain in idle mode Solid “E” Enter diagnostic recall mode Solid “U” Discharge Air Installed Solid “F” Enter flame signal mode Solid “P” (variable speed only) Program unit capacity size (Unit Code) Two horizontal lines soft disable...
  • Page 14 Ignition Control 107045-XX Diagnostic Modes 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 15 Ignition Control 107045-XX Diagnostic Modes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E124 Active communicating thermostat signal Equipment lost communication with the thermostat. Check missing for more than 3 minutes. four wiring connections, ohm wires and cycle power at the thermostat.
  • Page 16 Ignition Control 107045-XX Diagnostic Modes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E206 Gas valve second-stage relay failure Furnace will operate on 1st stage for remainder of the heating demand. Will clear after fault recovered. If un- able to operate 2nd stage, replace control.
  • Page 17 Ignition Control 107045-XX Diagnostic Modes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E271 Soft lockout - Exceeded maximum number of re- Check pressure (inches w.c.) of low pressure switch clos- tries. Last retry failed due to the pressure switch ing on heat call.
  • Page 18 Ignition Control 107045-XX Diagnostic Modes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E312 Restricted air flow in cooling or continu- Warning Only. Restricted airflow - Indoor blower is running at a re- ous fan mode is lower than cfm setting. duced 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 (0 to 0.8”...
  • Page 19 Ignition Control 103130-XX 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...
  • Page 20 Ignition Control 103130-XX 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) Two horizontal bars = Soft disable * No change implies the display will continue to show whatever is currently being displayed for normal operation (blinking decimal, active error code,...
  • Page 21 Ignition Control 103130-XX Diagnostic Codes 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 22 Ignition Control 103130-XX Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E124 Active communicating thermostat signal Equipment lost communication with the thermostat. Check missing for more than 3 minutes. four wiring connections, ohm wires and cycle power at the thermostat.
  • Page 23 Ignition Control 103130-XX Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E206 Gas valve second-stage relay failure Furnace will operate on 1st stage for remainder of the heating demand. Will clear after fault recovered. If un- able to operate 2nd stage, replace control.
  • Page 24 Ignition Control 103130-XX Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E271 Soft lockout - Exceeded maximum number of re- Check pressure (inches w.c.) of low pressure switch clos- tries. Last retry failed due to the pressure switch ing on heat call.
  • Page 25 Ignition Control 103130-XX Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E312 Restricted air flow in cooling or continu- Warning Only. Restricted airflow - Indoor blower is running at a re- ous fan mode is lower than cfm setting. duced 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 (0 to 0.8”...
  • Page 26 Ignition Control 103130-XX Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E406 LSOM - Compressor open start circuit. Required amount of current is not passing through Start cur- rent transformer. Clears the error after current is sensed in START sensor, or after power reset.
  • Page 27 TABLE 4 Integrated Control Switch Settings Conventional Thermostat (non-communicating) Blower Off Delay Switch Settings EL297DFV units are equipped with a two-stage, variable Blower Off Delay Switch 3 Switch 4 speed integrated control. This control manages ignition Seconds timing, heating mode fan off delays and indoor blower speeds based on selections made using the control dip 90 (factory) switches and jumpers.
  • Page 28 NOTE - In heat pump mode blower operation defaults to Ramping Option D option c. • Motor runs at 100% until demand is satisfied. TABLE 7 • Once demand is met, motor ramps down to stop. Cooling Mode Blower Speed Ramping Ramping Switch 9 Switch 10...
  • Page 29 On-Board Link W951 Heat Pump (R to O) On Board Links On-board link W951 is a clippable connection between Note: In communicating systems with a conventional out- terminals R and O on the integrated control. W951 must door unit (non-communicating), the on-board clippable be cut when the furnace is installed in applications which links must be set to properly configure the system.
  • Page 30 With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control Dave Lennox CS7000 thermostat to use for this application - Y2081 4 heat / 2 cool *Normal operation first stage cooling blower speed is 70% COOL speed.
  • Page 31 IMPORTANT All EL297DFV blower motors use single phase power. An external run capacitor is not used. The motor uses perma- Earlier ECM motors used on other Lennox furnace nently lubricated ball-type bearings. models are not interchangeable with motors used on the EL297UH furnace line.
  • Page 32 Motor Start-Up Troubleshooting Motor Operation When B3 begins start-up, the motor gently vibrates back To verify motor operation see steps below and FIGURE 9 and forth for a moment. This is normal. During this time and FIGURE 10. the electronic controller is determining the exact position 1 - Remove J48 (5 pin power plug) from P48 on the of the rotor.
  • Page 33 BLOWER B3 HARNESS CONNECTORS BLOWER B3 HARNESS CONNECTORS P48 5 Pin P49 4 Pin P48 5 Pin SHAFT SHAFT MOTOR with INTEGRATED CONTROLLER P49 4 Pin MOTOR with INTEGRATED CONTROLLER P48 5 Pin J48 5 Pin P49 4 Pin J49 4 Pin J48 Connector J49 4 Pin Control Connector 120v...
  • Page 34 Troubleshooting Motor Windings TEST B Use an ohmmeter to measure the motor phase-to-phase Ensure that motor windings are not damaged by perform- resistance by checking these combinations of the the 3-pin ing the following tests: motor plug. For the purpose of this test, start at either end NOTE - If your ohm meter is not an auto-ranging type, set of the connector as lead 1.
  • Page 35 NANCE. screw is located on the valve. 6. Primary Limit Control (S10) LPG change over kits are available from Lennox. Kits in- clude burner orifices and a gas valve. The primary limit (S10) is located in the heating vestibule 4. Flame Rollout Switches (S47) panel.
  • Page 36 Ignitor Check Test 1 Check ignitor circuit for correct resistance. Remove 4-pin plug from control. Check ohms reading across terminals 1 and 5. If value is correct, this is the only test needed. If the reading on the meter is not correct, (0 or infinity) then a second test is needed.
  • Page 37 NOTE - Each furnace model uses a unique CAI. Refer to tubing, to prevent condensate build up. Lennox Repair Parts listing for correct inducer for replace- ment. COMBUSTION AIR PRESSURE SWITCH The combustion air inducer is installed on the cold end header box.
  • Page 38 Pressure Switch Check 5 - Operate unit and observe manometer reading. Readings will change as heat exchanger warms. To check pressure switch differential, refer to FIGURE 17 a. Take one reading immediately after start-up. and use the provided fittings and tubing to follow the steps below.

  • Page 39: Installation

    II-PLACEMENT AND INSTALLATION TABLE 18 Continued Pipe & Fittings Specifications CANADA PIPE & FITTING & SOLVENT MARKING CEMENT All pipe, fittings, primer and solvent cement must conform with American National Standard Institute and the Ameri- PVC & CPVC Pipe and Fittings can Society for Testing and Materials (ANSI/ASTM) stan- PVC &...
  • Page 40 4 - Remove white PVC pipes, slide up and out thru the Top Vent Configuration top cap. Exhaust/Air 5 - Remove the black plastic fitting in top cap which Intake Connections previously aligned the PVC pipes. 6 - Remove the remaining parts of the pipe clamp at the blower deck.
  • Page 41 Right Side Vent Configuration Side Vent Sealing Plate Side Vent Sealing Gaskets Exhaust Intake Street Elbows (2) FIGURE 20 TABLE 19 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Flush Mount Wall Kit 1-1/2 inch 2 inch 3 inch Vent Pipe Dia. Input Size Field 2 inch 3 inch...
  • Page 42 Joint Cementing Procedure Venting Practices All cementing of joints should be done according to the Piping Suspension Guidelines specifications outlined in ASTM D 2855. NOTE - A sheet metal screw may be used to secure the SCHEDULE 40 intake pipe to the connector, if desired. Use a drill or self PVC - 5' tapping screw to make a pilot hole.
  • Page 43 1 - In areas where piping penetrates joists or interior 4 - Follow the lighting instructions. Turn on the appliance that is being inspected. Adjust the thermostat so walls, hole must be large enough to allow clearance that the appliance operates continuously. on all sides of pipe through center of hole using a hanger.
  • Page 44 NOTE - Lennox offers a glueless vent adapter kit 17H92 Vent Piping Guidelines as an option for exhaust exiting at the furnace top cap NOTE - Lennox has approved the use of DuraVent ® coupling Centrotherm manufactured vent pipe and terminations as NOTE - Exhaust pipe MUST be glued to furnace exhaust an option to PVC.
  • Page 45 TABLE 21 STANDARD TERMINATION AT ELEVATION 0 - 4500 ft. Pipe Size 1-1/2 in. 2 in. 2-1/2 in. 3 in. Input 045 No. of 90 ELL STANDARD TERMINATION ELEVATION 4501 - 10,000 ft. Pipe Size 1-1/2 in. 2 in. 2-1/2 in. 3 in.
  • Page 46 TYPICAL EXHAUST PIPE CONNECTIONS 045/070 Only 2” 1−1/2” 2” 2” 2” 2” TRANSITION 2” Exhaust Exhaust 3” DO NOT transition from larger to smaller pipe in horizontal runs of exhaust pipe. TRANSITION INTAKE EXHAUST DO NOT transition from smaller *2” to larger pipe size in horizontal TOP VIEW runs of exhaust pipe.
  • Page 47 TYPICAL EXHAUST CONNECTIONS WITH RIGHT SIDE VENT OPTION Pipe Length 4” Maximum (Not Furnished) 3” 2” 2” TRANSITION *2” 2” Plate (Furnished) Street Ell (Not Furnished) TOP VIEW * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. NOTE Intake pipe and exhaust pipe must be the same diameter.
  • Page 48 Intake Piping EQUIPMENT IN CONFINED SPACE (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside) The EL297DFV furnace may be installed in either direct vent or non-direct vent applications. In non-direct vent ap- Roof Terminated plications, when intake air will be drawn into the furnace Exhaust Pipe from the surrounding space, the indoor air quality must be considered.
  • Page 49 In both Non-Direct Vent and Direct Vent applications, the TYPICAL AIR INTAKE PIPE CONNECTIONS vent termination is limited by local building codes. In the NON−DIRECT VENT APPLICATIONS absence of local codes, refer to the current National Fuel Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current INTAKE CSA-B149 Natural Gas and Propane Installation Codes in SCREEN...
  • Page 50 TABLE 22 Maximum Allowable Exhaust Vent Pipe Length (in ft. ) Without Insulation In Unconditioned Space For Winter Design Temperatures Two - Stage High Efficiency Furnace Vent Pipe Unit Input Size Winter Design Temperatures1 °F (°C) Diameter 1-1/2 in 32 to 21 2 in (0 to -6) 2-1/2 in...
  • Page 51 TABLE 23 Maximum Allowable Exhaust Vent Length Using Ventilated Attic or Crawl Space For Intake Air in Feet NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation. Standard Termination at Elevation 0 - 10,000 ft Number 1-1/2...
  • Page 52 ‡ Permitted only if veranda, porch, deck or balcony is fully open NOTE - This figure is intended to illustrate clearance on a minimum of two sides beneath the floor. Lennox recommends requirement and does not serve as a substitute for avoiding this location if possible.
  • Page 53 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of locally adopted installation codes. two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 33 Page 53...
  • Page 54 Details of Intake and Exhaust Piping Terminations for 6 - On field supplied terminations, a minimum distance Direct Vent Installations between the end of the exhaust pipe and the end of the intake pipe without a termination elbow is 8” and NOTE - In Direct Vent installations, combustion air is taken a minimum distance of 6”...
  • Page 55 7 - I f intake and exhaust piping must be run up a side wall, the exhaust piping must be terminated with pipe wall to position above snow accumulation or other sized per TABLE 24.The intake piping may be equipped obstructions, piping must be supported.
  • Page 56 2” EXTENSION FOR 2” PVC Accelerator not required for PIPE1” EXTENSION FOR 3” 3” concentric PVC PIPE FURNACE EXHAUST FLASHING PIPE 12” (305mm) (Not Furnished) INTAKE Minimum Above Average FURNACE Snow INTAKE Accumulation PIPE GLUE EXHAUST END FLUSH INTO SHEET METAL STRAP TERMINATION (Clamp and sheet metal strap must be field installed to support...
  • Page 57 3 - If exhaust piping must be run up a side wall CONDENSATE TRAP AND PLUG LOCATIONS to position above snow accumulation or other obstructions, piping must be supported every 24 inches (610mm). When exhaust piping must be run up an outside wall, any reduction in exhaust pipe size must be done after the final elbow.
  • Page 58 1” min. 2” max. above used on the condensate trap and line. Heat cable kit condensate drain. is available from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68; 24 ft. (7.3m) - kit no. 26K69; and 50 ft. Condensate (15.2m) - kit no.
  • Page 59 TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC COLD END HEADER BOX WITH 3/4” DRAIN CONNECTION Optional Condensate Drain Connection Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) 90° Street Elbow 3/4 inch PVC (not furnished) Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) Condensate Drain...

  • Page 60: Start Up

    III-START-UP 4 - This furnace is equipped with an ignition device which automatically lights the burners. Do not try to A-Preliminary and Seasonal Checks light the burners by hand. 1 - Inspect electrical wiring, both field and factory 5 - Remove the upper access panel. installed for loose connections.

  • Page 61: Heating System Service Checks

    IV-HEATING SYSTEM SERVICE CHECKS It is available through Lennox under part number 31B2001. See Corp. 8411-L10, for further details. A-CSA Certification Do not use matches, candles, flame or any other All units are CSA design certified without modifications. source of ignition to check for gas leaks.
  • Page 62 NOTE- To obtain accurate reading, shut off all other gas G- Proper Combustion appliances connected to meter. Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking com- TABLE 25 bustion. See sections E- and F-. Take combustion sam- GAS METER CLOCKING CHART ple beyond the flue outlet.
  • Page 63 I- 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 premature control. See FIGURE 53.This voltage should be in ignitor failure.

  • Page 64: Typical Operating Characteristics

    V-TYPICAL OPERATING CHARACTERISTICS W.C. For cooling speed (second stage cool speed) external static pressure drop must not be more than A-Blower Operation and Adjustment 1.0” W.C. 1 - Blower operation is dependent on thermostat control 4 - Seal the hole when the check is complete. system.
  • Page 65 Before using any filter with this system, check the specifications provided by the filter manufacturer sembling unit. Use papers or protective covering in front of against the data given in the appropriate Lennox furnace while removing heat exchanger assembly. Product Specifications bulletin.
  • Page 66 16 - Mark and disconnect any remaining wiring to 41 - Replace the blower compartment access panel. heating compartment components. Disengage strain 42 - Follow lighting instructions on unit nameplate to relief bushing and pull wiring and bushing through the light and operate furnace for 5 minutes to ensure hole in the blower deck.

  • Page 67: Wiring And Sequence Of Operation

    VII- Wiring and Sequence of Operation CUT SIZE 9" WIDE x 8-1/4" TALL EL297DFV WITH IGNITION CONTROL 107045-XX UNIT DIAGRAM COMBUSTION AIR COMBUSTION AIR BLOWER MOTOR BLOWER MOTOR DOOR INTERLOCK IGNITOR CIRC FLAME SENSE WHT/PINK FLAME SENSOR 120V BLUE BLUE MV COM PINK PURPLE...
  • Page 68 EL297DFV WITH IGNITION CONTROL 103130-XX UNIT DIAGRAM COMBUSTION AIR COMBUSTION AIR BLOWER MOTOR BLOWER MOTOR DOOR INTERLOCK IGNITOR CIRC FLAME SENSE WHT/PINK FLAME SENSOR 120V BLUE BLUE MV COM PINK PURPLE S102 HIGH HEAT PRESSURE SWITCH PURPLE PINK S128 LOW HEAT BLUE PRESSURE SWITCH BRW W / YEL...
  • Page 69 3 - After the pre-purge is complete, a 20-second initial CAUTION ignitor warm-up period begins. The combustion air inducer continues to operate at low speed. Failure to use properly sized wiring and circuit breaker may result in property damage. Size wiring 4 - After the 20-second warm-up period has ended, and circuit breaker(s) per Product Specifications the gas valve is energized on low fire (first stage)
  • Page 70 Applications Using A Single-Stage Thermostat See 4 - After the 20-second warm-up period has ended, FIGURE 58 for ignition control sequence the gas valve is energized on low fire (first stage) and ignition occurs. At the same time, the control B - Heating Sequence -- Integrated Control Thermostat module sends a signal to begin an indoor blower Selection DIP Switch 1 ON in “Single-Stage”...
  • Page 71 VIII- Field Wiring With Conventional and Communicating Enabled Thermostat Ignition Control Control 107045-XX Communicating Enabled Furnace and Non- Communicating Enabled Furnace and Communicating Outdoor Unit Communicating Enabled Outdoor Unit COMMUNICATING FURNACE COMMUNICATING FURNACE OPTIONAL DISCHARGE AIR SENSOR OPTIONAL DISCHARGE AIR SENSOR OPTIONAL OUTDOOR OPTIONAL...
  • Page 72 Ignition Control Control 107045-XX Optional Accessories for use with Communicating System NOTE: COMMUNICATING THERMOSTAT SENSES HUMIDITY 120V CONNECTIONS & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT REQUIRED. “HUM” CONTACT IS CLOSED ANYTIME OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HUMIDI− HUMIDITY DEMAND FIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER FUNC−...
  • Page 73 LENNOX COMMUNICATING OUTDOOR UNIT INDOOR UNIT (1 OR 2 STAGE) FLOAT SWITCH LENNOX COMMUNICATING OUTDOOR UNIT LENNOX COMMUNICATING FURNACE EL296V, SL280V, SL280VN, SL297V, SLP99V cutting DS to R will not cause communication interuption or error code CUT* R−DS W914 FIGURE 2...
  • Page 74 Ignition Control 107045-XX DIP Switch Settings and On Board Links DIP Switch Settings and On-Board Links 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 75 Ignition Control 10745-XX DIP Switch Settings and On Board Links DIP Switch Settings and On-Board Links 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 76 Ignition Control 10745-XX DIP Switch Settings and On Board Links DIP Switch Settings and On-Board Links DIP Switch 1 Thermostat On Board Links Must Be Cut To Select Wiring Connections Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7742U TERM.
  • Page 77 Ignition Control 10745-XX DIP Switch Settings and On Board Links DIP Switch Settings and On-Board Links DIP Switch 1 Thermostat On Board Links Must Be Cut To Select Wiring Connections Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7742U TERM.
  • Page 78 Ignition Control 103130-XX Communicating Enabled Furnace with Communicating Enabled Furnace with a a Non-Communicating Outdoor Unit Communicating Enabled Outdoor Unit COMMUNICATING FURNACE COMMUNICATING FURNACE OPTIONAL DISCHARGE AIR SENSOR OPTIONAL DISCHARGE AIR SENSOR OPTIONAL OUTDOOR OPTIONAL COMMUNICATING AIR SENSOR OUTDOOR THERMOSTAT AIR SENSOR COMMUNICATING THERMOSTAT...
  • Page 79 Ignition Control 103130-XX Optional Accessories for use with any Communicating System NOTE: ICOMMUNICATING THERMOSTAT SENSES HUMIDITY & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED 120V CONNECTIONS QUIRED. “HUM” CONTACT IS CLOSED ANYTIME HUMIDITY DEMAND IS PRESENT TIONS. BUILT INTO ALL COMMUNICATING ENABLED OUT DOOR UNITS).
  • Page 80 LENNOX COMMUNICATING OUTDOOR UNIT INDOOR UNIT (1 OR 2 STAGE) FLOAT SWITCH LENNOX COMMUNICATING OUTDOOR UNIT LENNOX COMMUNICATING FURNACE EL296V, SL280V, SL280VN, SL297V, SLP99V cutting DS to R will not cause communication interuption or error code CUT* R-DS W914 Page 80...
  • Page 81 Ignition Control 103130-XX DIP Switch Settings and On Board Links DIP Switch Settings and On-Board Links 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 82 Ignition Control 103130-XX DIP Switch Settings and On Board Links DIP Switch Settings and On-Board Links 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 83 Ignition Control 103130-XX DIP Switch Settings and On Board Links DIP Switch Settings and On-Board Links DIP Switch 1 Thermostat On Board Links Must Be Cut To Select Wiring Connections Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP T'STAT TERM.
  • Page 84 Ignition Control 103130-XX DIP Switch Settings and On Board Links DIP Switch Settings and On-Board Links DIP Switch 1 Thermostat On Board Links Must Be Cut To Select Wiring Connections Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP T'STAT TERM.

  • Page 85: Program Unit Capacity Size Mode

    IX- Program Unit Capacity Size Modes Power-Up - Number displayed represents by integrated control unit size code (furnace model − − and capacity). If three horizontal bars are displayed followed by continuous E203, furnace − control does not recognize unit size code. Configure per the following: Furnace control in IDLE mode No heating, cooling or indoor fan operation)

  • Page 86: Troubleshooting

    X- 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 INDOOR SWITCH WATCHGUARD − AFTER HEAT FAN LIMIT SWITCH CODE BLOWER...
  • Page 87 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? EXPIRED? ONLY FOR 1ST REQUEST FOR 2ND STAGE HEAT INDUCER SWITCHED TO HIGH SPEED HIGH...
  • Page 88 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 89 Cooling Sequence of Operation 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 90 Continuous Fan Operation CALL FOR FAN CALL FOR FAN INDOOR BLOWER ON CONTINUOUS FAN SPEED MAINTAIN INDOOR CALL FOR FAN BLOWER AT REMOVED? CONTINUOUS FAN REQUEST MAINTAIN INDOOR FOR COOLING GO TO CALL FOR COOLING BLOWER AT RECEIVED? CONTINUOUS FAN MAINTAIN INDOOR REQUEST BLOWER AT...

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