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Lennox EL296UHV Series Unit Information

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Table of Contents

S e r v i c e L i t e r a t u r e
COMMUNICATING - ENABLED EL296UHV(X) SERIES UNITS
EL296UHV(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. EL296UHV(X) units are available in
heating capacities of 44,000 to 132,000 Btuh and cooling
applications up to 5 tons. Refer to Product Specifications
Manual for proper sizing.
Units are factory equipped for use with natural gas. Kits
are available for conversion to LPG operation. EL296UH-
V(X) model units are equipped with the icomfort
SureLight ® two-stage variable speed integrated control.
EL296UHV(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
Blower CFM Data . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . Page 27
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 58
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 81
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 86
VIII Field Wiring and Jumper Settings . .
UNIT INFORMATION
UNIT INFORMATION
Corp 1125-L5
Revised 03/2022
enabled
®
. . . . . Page 95
Page 1
WARNING
installation,
Improper
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.
EL296UHV(X)
adjustment,
alteration,
©2016 Lennox Industries, Inc.

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Summary of Contents for Lennox EL296UHV Series

  • Page 1: Table Of Contents

    EL296UHV(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. EL296UHV(X) units are available in heating capacities of 44,000 to 132,000 Btuh and cooling applications up to 5 tons.

  • Page 2: Specifications

    SPECIFI CAT IONS Model No. EL296UH045XV36B EL296UH070XV36B EL296UH090XV36C Heating AFUE Performance High Input - Btuh 44,000 66,000 88,000 Fire Output - Btuh 42,000 62,000 84,000 Temperature rise range - °F 35 - 65 50 - 80 60 - 90 Gas Manifold Pressure (in. w.g.) 3.5 / 10.0 3.5 / 10.0 3.5 / 10.0...
  • Page 3 SP ECIF ICATIONS Model No. EL296UH110XV60C EL296UH135XV60D Heating AFUE Performance High Input - Btuh 110,000 132,000 Fire Output - Btuh 106,000 126,000 Temperature rise range - °F 45 - 75 55 - 85 Gas Manifold Pressure (in. w.g.) 3.5 / 10.0 3.5 / 10.0 Nat.
  • Page 4 OPT IONAL AC C ESSORIES - ORD ER SEPARAT ELY NOTE - FURNACES CANNOT BE TWINNED! “B” Width “C” Width “D” Width Models Models Models CABINET ACCESSORIES Horizontal Suspension Kit - Horizontal only 51W10 51W10 51W10 Return Air Base - Upflow only 50W98 50W99 51W00...

  • Page 5: Blower Cfm Data

    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 iHarmony Zoning System Applications - Minimum blower speed is 250 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 250 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 250 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 250 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 8 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 iHarmony Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 9 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 iHarmony Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 10 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 iHarmony Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 11 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 iHarmony Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 12 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 iHarmony Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 13 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 iHarmony Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 14 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 iHarmony Zoning System Applications - Minimum blower speed is 380 cfm.
  • Page 15 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 iHarmony Zoning System Applications - Minimum blower speed is 380 cfm.
  • Page 16 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 iHarmony Zoning System Applications - Minimum blower speed is 380 cfm.
  • Page 17 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 iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 18 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 iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 19 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 iHarmony Zoning System Applications - Minimum blower speed is 380 cfm.
  • Page 20 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 iHarmony Zoning System Applications - Minimum blower speed is 380 cfm.
  • Page 21 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 iHarmony Zoning System Applications - Minimum blower speed is 380 cfm.
  • Page 22 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 iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 23 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 iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 24 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 iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 25 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 iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 26 PARTS IDENTIFICATION Field Make Up Box Burner Box Assembly Heat Exchanger Gas Valve Combustion Pressure Air Inducer Switch Assembly Bag Assemblies (shipping location) Door Interlock Primary Limit Switch Variable Speed Motor Outer Access Panel Inner Access Panel Blower Drive (some units) Two-Stage Integrated Control FIGURE 1 Page 26...

  • Page 27: I Unit Components

    I-UNIT COMPONENTS CIRCUIT BREAKER CB8 EL296UHV(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 28 Once the first stage prove switch is determined to be open, TABLE 1 the combustion air inducer is energized on low (first stage) SureLight Control 5 Pin Terminal Designation ® heat speed. When the differential in the prove switch is Pin # Function great enough, the prove switch closes and a 15-second...
  • Page 29 INTEGRATED CONTROL 103130-05 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 TB83...
  • Page 30 IGNITION CONTROL 107045-01 RS-BUS LINK (TB82, future use) THERMOSTAT CONNECTIONS (TB1) DS = DEHUMIDIFICATION SIGNAL I+ = DATA HIGH CONNECTION I - = DATA LOW CONNECTION W2 = HEAT DEMAND FROM 2ND STAGE T/STAT R = 24VAC W1 = HEAT DEMAND FROM 1ST STAGE T/STAT I + = DATA HIGH CONNECTION R = CLASS 2 VOLTAGE TO THERMOSTAT I - = DATA LOW CONNECTION...
  • Page 31 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 − 10% UPSTAGE MEDIUM−HIGH DELAY SPEED 1−STAGE (70%)
  • Page 32 TABLE 4 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...
  • Page 33 TABLE 5 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 34 TABLE 5 Continued 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 35 TABLE 5 Continued 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 36 TABLE 5 Continued 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 37 TABLE 5 Continued 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 38 TABLE 5 Continued 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 39 Ignition Control 107045-XX 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 40 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 41 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 42 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 43 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 44 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 45 TABLE 6 Integrated Control Switch Settings Conventional Thermostat (non-communicating) Blower Off Delay Switch Settings EL296UHV 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 46 NOTE - The off portion of the selected ramp profile also Ramping Option D applies during heat pump operation in dual fuel applica- • Motor runs at 100% until demand is satisfied. tions. • Once demand is met, motor ramps down to stop. TABLE 9 Cooling Mode Blower Speed Ramping Ramping...
  • Page 47 Refer to TABLE 12 for operation sequence in applications On Board Links including EL296UHV, a thermostat which features hu- Note: In communicating systems with a conventional out- midity control and a single-speed outdoor unit. TABLE 13 door unit (non-communicating), the on-board clippable gives the operation sequence in applications with a two- links must be set to properly configure the system.
  • Page 48 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 49 IMPORTANT Earlier ECM motors used on other Lennox furnace models are not interchangeable with motors used on the EL296UH furnace line. A solid-state controller is permanently attached to the mo- tor.
  • Page 50 The controller uses sensing devices to sense what posi- WARNING tion the rotor is in at any given time. By sensing the posi- tion of the rotor and then switching the motor windings on Disconnect power from unit and wait at least and off in sequence, the rotor shaft turns the blower.
  • Page 51 BLOWER B3 HARNESS CONNECTORS BLOWER B3 HARNESS CONNECTORS P48 5 Pin P48 5 Pin P49 4 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 52 Test B FIGURE 14 FIGURE 12 Models with the Lennox Blower Drive TEST A Removed the three blower leads from the blower drive. Measure the resistance between each of the three motor see TEST A. If ohms to ground shows resistance replace leads (3-pin plug) and the unpainted part of the end shield.
  • Page 53 Inlet and outlet pressure taps are located on the valve. A regulator adjustment screw is located on the valve. LPG change over kits are available from Lennox. Kits in- clude burner orifices and a gas valve. Page 53...
  • Page 54 HEATING COMPONENTS Burner Assembly Intake Air Top Cap Sensor Rollout Switch Rollout Switch Ignitor Manifold And Gas Orifices Burner Box Cover Two-Stage Gas Valve FIGURE 15 Page 54...
  • Page 55 Ignitor Check Test 1 Check ignitor circuit for correct resistance. Remove 4-pin plug from control. Check ohms reading across terminals 1 and 5. Reading should be between 39 and 70 ohms. 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 56 NOTE - Each furnace model uses a unique CAI. Refer to pressure becomes more equal with atmospheric pres- Lennox Repair Parts listing for correct inducer for replace- sure) and opens the circuit to the furnace control and gas ment.
  • Page 57 4 - Take a second piece the 2” length square tubing and TABLE 20 connect to the negative (-) side of the pressure 7501 - 10000’ switch. Take a second piece of 10” length square Unit Set Point Low Heat Set Point High Heat tubing and tee into the tubing from the negative (-) side of the cold end header box and the other -045...

  • Page 58: Installation

    II-PLACEMENT AND INSTALLATION CAUTION All pipe, fittings, primer and solvent cement must conform Solvent cements for plastic pipe are flammable liquids with American National Standard Institute and the Ameri- can Society for Testing and Materials (ANSI/ASTM) stan- and should be kept away from all sources of ignition. dards.
  • Page 59 TABLE 22 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Wall Kit 1-1.2 inch 2 inch 3 inch Flush Mount Vent Pipe Dia. 2 inch 3 inch Input Size Field 71M80 (US) 69M29 (US) 60L46 (US) 51W11 (US) Fabricated 22G44 (US) 44J40 (US) 444W92 (CA) 444W92 (CA) 444W93 (CA)
  • Page 60 8 - After assembly, wipe excess cement from pipe at end Conduct the following test while each appliance is oper- of fitting socket. A properly made joint will show a ating and the other appliances (which are not operating) bead around its entire perimeter. Any gaps may remain connected to the common venting system.
  • Page 61 NOTE - Exhaust piping should be checked carefully to make sure there are no sags or low spots. FIGURE 21 Vent Piping Guidelines NOTE - Lennox has approved the use of DuraVent® and TABLE 23 Centrotherm manufactured vent pipe and terminations MINIMUM VENT PIPE LENGTHS as an option to PVC.
  • Page 62 Use the following steps to correctly size vent pipe diam- IMPORTANT eter. Do not use screens or perforated metal in exhaust or Piping Size Process intake terminations. Doing so will cause freeze-ups and may block the terminations. What is the furnace capacity? Which style termination being used?
  • Page 63 TABLE 24 Maximum Allowable Intake or Exhaust Vent Length in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size Standard Termination at Elevation 0 - 4500 ft No Of 1-1/2”...
  • Page 64 TABLE 24 Continued Maximum Allowable Intake or Exhaust Vent Length in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size. Concentric Termination at Elevation 0 - 4500 ft No Of 1-1/2”...
  • Page 65 TABLE 25 Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl Space For Intake Air in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.
  • Page 66 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS 2” EXHAUST EXHAUST INTAKE INTAKE 2” 2” 2” 2” 2” 3” 3” 045/070 Only 1−1/2” TRANSITION Exhaust 2” 6” Min Exhaust DO NOT transition from larger to smaller DO NOT transition pipe in horizontal runs from smaller to larger...
  • Page 67 Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS The EL296UHV furnace may be installed in either direct HORIZONTAL NON−DIRECT VENT APPLICATIONS vent or non-direct vent applications. In non-direct vent (Horizontal Right−Hand Air Discharge Application Shown) applications, when intake air will be drawn into the furnace from the surrounding space, the indoor air quality must be considered and guidelines listed in Combustion, Dilution and Ventilation Air section must be followed.
  • Page 68 General Guidelines for Vent Terminations CAUTION In Non-Direct Vent applications, combustion air is taken If this unit is being installed in an application with from indoors or ventilated attic or crawlspace and the flue combustion air coming in from a space serviced by gases are discharged to the outdoors.
  • Page 69 TABLE 26 Maximum Allowable Exhaust Vent Pipe Length (in ft. ) Without Insulation In Unconditioned Space For Winter Design Temperatures Two - Stage High Efficiency Furnace Winter Design Unit Input Size Vent Pipe Temperatures1 °F Diameter (°C) 1-1/2 32 to 21 2 in (0 to -6) 2-1/2 in...
  • Page 70 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 30...
  • Page 71 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 31 Page 71...
  • Page 72 Details of Intake and Exhaust Piping Terminations for 3”(76mm) MAX. Inches(mm) Direct Vent Installations NOTE - In Direct Vent installations, combustion air is taken UNCONDITIONED from outdoors and flue gases are discharged to outdoors. ATTIC SPACE 8” (203mm) MIN NOTE - Flue gas may be slightly acidic and may adverse- ly affect some building materials.
  • Page 73 7 - If intake and exhaust piping must be run up a side TABLE 27 wall to position above snow accumulation or other EXHAUST PIPE TERMINATION SIZE REDUCTION obstructions, piping must be supported. At least one bracket must be used within 6” from the top of EL296UHV Termination the elbow and then every 24”...
  • Page 74 2” EXTENSION FOR 2” PVC PIPE1” EXTENSION FOR 3” PVC PIPE 12” EXHAUST FURNACE (305mm) VENT 5-1/2” EXHAUST 5” (140mm) (127mm) PIPE INTAKE FURNACE 18” MAX. Front View INTAKE (457mm) PIPE EXHAUST VENT GLUE EXHAUST END FLUSH INTO 12” (305mm) Min. TERMINATION above grade or Inches (mm)
  • Page 75 2 - On field supplied terminations for side wall exit, NOTE - If necessary the condensate trap may be installed exhaust piping may extend a maximum of 12 inches up to 5’ away from the furnace. Use PVC pipe to connect (305MM) for 2”...
  • Page 76 If this is not possible, a heat cable kit may be used on the condensate trap and line. Heating cable kit is available from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68; 24 ft. (7.3m) - kit no.
  • Page 77 Condensate Trap With Optional Overflow Switch From Evaporator Coil HorizontalFurnace4” Min. to 5” Max.above condensatedrain connection) FurnaceCondensate DrainConnection Optional FIGURE 47 Furnace with Evaporator Coil Using a Separate Drain (Unit shown in horizontal left-hand discharge position) Field Provided Vent Evaporator (4”...
  • Page 78 IMPORTANT Furnace with Evaporator Coil Using a Common Drain When combining the furnace and evaporator coil drains together, the A/C condensate drain outlet Evaporator drain must be vented to relieve pressure in order for the line required furnace pressure switch to operate properly. (Trap at coil is optional) (1”...
  • Page 79 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 80 TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC COLD END HEADER BOX WITH 1/2” DRAIN CONNECTION Optional Condensate Drain Connection Adapter 1/2 inch slip X 1/2 inch mpt (Not Furnished) 90° Street Elbow 1/2 inch PVC (Not Furnished) Adapter 1/2 inch slip X 1/2 inch mpt (Not Furnished) Condensate Drain...

  • Page 81: 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 82: Heating System Service Checks

    NOTE- To obtain accurate reading, shut off all other gas corrosion on various metals used in gas piping. Use of a appliances connected to meter. specialty Gas Leak Detector is strongly recommended. It is available through Lennox under part number 31B2001. See Corp. 8411-L10, for further details. Page 82...
  • Page 83 G- Proper Combustion TABLE 28 Furnace should operate minimum 15 minutes with correct GAS METER CLOCKING CHART manifold pressure and gas flow rate before checking com- Seconds for One Revolution bustion. See sections E- and F-. Take combustion sample EL296 Natural beyond the flue outlet.
  • Page 84 TABLE 31 Manifold and Supply Line Pressure 0-10,000ft. Manifold Pressure in. wg. Supply Line Pressure in. w.g 0 - 4500 ft 4501 - 5500 ft. 5501 - 6500 ft 6501 - 7500 ft 7501 - 10,000 ft 0 - 10,000 ft. Unit High High...
  • Page 85 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 55. This voltage should be in ignitor failure.

  • Page 86: Typical Operating Characteristics

    V-TYPICAL OPERATING CHARACTERISTICS For heating speed (second stage heat speed) external static pressure drop must not be more than 0.8” W.C. A-Blower Operation and Adjustment For cooling speed (second stage cool speed) external static pressure drop must not be more than 1.0” W.C. 1 - Blower operation is dependent on thermostat control system.
  • Page 87 1 when disas- 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 88 17 - Remove electrical junction box from the side of the 41 - Reconnect the combustion air intake pipe. furnace. 42 - Reinstall burner box cover. 18 - Mark and disconnect any remaining wiring to heating 43 - Reconnect wires to gas valve. compartment components.

  • Page 89: Wiring And Sequence Of Operation

    VII- Wiring and Sequence of Operation Ignition Control 103130-05 EL296 Schematic Diagram Page 89...
  • Page 90 Ignition Control 103130-05 and Blower Drive EL296 Units With Blower Drive Page 90...
  • Page 91 Ignition Control 107045-01 Page 91...
  • Page 92 Ignition Control 107045-01 and Blower Drive Page 92...
  • Page 93 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, the and circuit breaker(s) per Product Specifications gas valve is energized on low fire (first stage) and...
  • Page 94 Applications Using A Single-Stage Thermostat See 4 - After the 20-second warm-up period has ended, the FIGURE 60 for ignition control sequence gas valve is energized on low fire (first stage) and ignition occurs. At the same time, the control module B - Heating Sequence -- Integrated Control Thermostat sends a signal to begin an indoor blower 30-second Selection DIP Switch 1 ON in “Single-Stage”...
  • Page 95 VIII- Field Wiring With Conventional and Communicating Enabled Thermostat Ignition Control 103130-05 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...
  • Page 96 Ignition Control 103130-05 Optional Accessories for use with any Communicating System NOTE: ICOMMUNICATING THERMOSTAT SENSES HUMIDITY & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED 120V CONNECTIONS “HUM” CONTACT IS QUIRED. CLOSED ANYTIME HUMIDITY DEMAND IS PRESENT TIONS. BUILT INTO ALL COMMUNICATING ENABLED OUT DOOR UNITS).
  • Page 97 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 97...
  • Page 98 Ignition Control 103130-05 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 99 Ignition Control 103130-05 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 100 Ignition Control 103130-05 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 101 Ignition Control 103130-05 DIP Switch Settings and On Board Links DIP Switch Settings and On-Board Links DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP T'STAT TERM.
  • Page 102 Ignition Control 107045-01 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 COMMUNICATING AIR SENSOR OUTDOOR THERMOSTAT AIR SENSOR COMMUNICATING THERMOSTAT DOOR AIR CONDITIONING...
  • Page 103 Ignition Control 107045-01 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 104 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 105 Ignition Control 107045-01 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 106 Ignition Control 107045-01 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 107 Ignition Control 107045-01 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 108 Ignition Control 107045-01 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 109: 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 110: Troubleshooting

    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 INDOOR SWITCH WATCHGUARD − AFTER HEAT FAN LIMIT SWITCH CODE BLOWER...
  • Page 111 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? EXPIRED? ONLY FOR 1ST REQUEST FOR 2ND STAGE HEAT INDUCER SWITCHED TO HIGH SPEED HIGH...
  • Page 112 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 113 Troubleshooting: 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 114 Troubleshooting: 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...

This manual is also suitable for:

El296uhvx seriesEl296uh045xv36bEl296uh070xv36bEl296uh090xv36cEl296uh090xv48cEl296uh090xv60c ... Show all

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