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Lennox EL296UHVX Series Unit Information

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Table of Contents

Service Literature
icomfort
EL296UHV(X) series units are 90% efficiency gas furnaces
used for upflow or horizontal applications only, manufac­
tured with Lennox Duralokt heat exchangers formed of
aluminized steel. EL296UHV(X) units are available in heat­
ing capacities of 44,000 to 132,000 Btuh and cooling ap­
plications 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. EL296UHV(X)
model units are equipped with the icomfort
®
eLight
two-stage variable speed integrated control.
EL296UHV(X) unit meets the California Nitrogen Oxides
(NO
) Standards and California Seasonal Efficiency re­
x
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. 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. 1125-L5
Revised 06/2021
®
- ENABLED EL296UHV(X) SERIES UNITS
®
enabled Sur­
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Page 50
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Page 1
EL296UHV(X)
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person­
al injury or loss of life. Installation and service must
be performed by a licensed professional HVAC in­
staller (or equivalent), service agency or the gas sup­
plier.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in­
jury. Take care while handling this equipment and
wear gloves and protective clothing.
© 2021 Lennox Industries Inc.

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Summary of Contents for Lennox EL296UHVX Series

  • Page 1: Table Of Contents

    EL296UHV(X) series units are 90% efficiency gas furnaces used for upflow or horizontal applications only, manufac­ tured with Lennox Duralokt heat exchangers formed of aluminized steel. EL296UHV(X) units are available in heat­ ing capacities of 44,000 to 132,000 Btuh and cooling ap­...

  • Page 2: Specifications

    SP ECIF ICATIONS 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 EL296UHV 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 27: I Unit Components

    I-UNIT COMPONENTS 3. Circuit Breaker (CB8) A 24V circuit breaker is also located in the control box. EL296UHV(X) unit components are shown in figure 1. The The switch provides overcurrent protection to the trans­ former (T1). The breaker is rated 3A at 32V. If the current gas valve, combustion air inducer and burners can be ac­...
  • 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 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 HEAT PUMP...
  • Page 30 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 31 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 “F” Enter flame signal mode Solid “P” (variable speed only) Program unit capacity/size (Unit Code) Soft disable Two horizontal bars __ * No change implies the display will continue to show whatever is currently being displayed for normal operation (blinking...
  • Page 32 TABLE 5 Integrated Diagnostic Codes/Status of Equipment 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 33 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 34 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 Measure resistance of hot surface ignitor.
  • Page 35 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 36 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 (0 to 0.8”...
  • Page 37 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 38 -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 tables for corresponding cfm val­ S Once demand is met, motor runs at 100% for 45 sec­ ues.
  • Page 39 With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight control setpoint** ® Use Dave Lennox ComfortSense 7000 thermostat Y2081 4 heat / 2 cool for this application *Dehumidification blower speed is 70% of COOL speed for all units . ®...
  • Page 40 With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight control ® Use Dave Lennox ComfortSense 7000 thermostat Y2081 4 heat / 2 cool for this application. *Normal operation first stage cooling blower speed is 70% COOL speed.
  • Page 41 Three pin connector to troller. blower motor 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 motor. The controller is primarily an A.C. to D.C. con­...
  • Page 42 The controller uses sensing devices to sense what position DANGER the rotor is in at any given time. By sensing the position of the rotor and then switching the motor windings on and off in se­ Disconnect power from unit and quence, the rotor shaft turns the blower.
  • Page 43 BLOWER B3 HARNESS CONNECTORS BLOWER B3 HARNESS CONNECTORS P48 5 Pin P48 5 Pin P49 4 Pin SHAFT SHAFT P49 4 Pin MOTOR with INTEGRATED MOTOR with INTEGRATED CONTROLLER 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 44 0-200 place the motor and control module. Test B FIGURE 13 Models with the Lennox Blower Drive FIGURE 11 Removed the three blower leads from the blower drive. see TEST A. If ohms to ground shows resistance replace mo­ tor. If the circuit is open move to test B and table below for TEST A acceptable resistance.
  • Page 45 C- Heating Components LPG change over kits are available from Lennox. Kits include 1. Ignitor burner orifices and a gas valve. ® The SureLight ignitor is made of durable silicon nitride. Ig­ nitor longevity is enhanced by controlling voltage to the ig­...
  • Page 46 EL296UHV 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 14 Page 46...
  • Page 47 EL296UHV 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 48 NOTE - Each furnace model uses a unique CAI. Refer to COMBUSTION AIR PRESSURE SWITCH Lennox Repair Parts listing for correct inducer for replace­ ment. The combustion air inducer is installed on the cold end header box. The cold end header box is a single piece made of hard plastic.
  • Page 49 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 and a. Take one reading immediately after start‐up. use the provided fittings and tubing to follow the steps be­ low.

  • Page 50: Installation

    II-PLACEMENT AND INSTALLATION IMPORTANT All pipe, fittings, primer and solvent cement must conform with American National Standard Institute and the Ameri­ EL296UHV exhaust and intake connections are can Society for Testing and Materials (ANSI/ASTM) stan­ made of PVC. Use PVC primer and solvent cement dards.
  • Page 51 TABLE 22 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Flush­ Wall Kit Wall Ring Kit 1-1/2 inch 2 inch 3 inch Mount Vent 2 inch 3 inch 2 inch Pipe Input Size Field Dia. in. 51W11 71M80 69M29 Fabricated 44J40 22G44 (US) 60L46 (US) (US) (US)
  • Page 52 8 - After assembly, wipe excess cement from pipe at end Conduct the following test while each appliance is operat­ of fitting socket. A properly made joint will show a ing and the other appliances (which are not operating) re­ bead around its entire perimeter.
  • Page 53 A minimum of 1/4” (6mm) drop for each 12” (305mm) of horizontal run is mandatory for drainage. ® NOTE - Lennox has approved the use of DuraVent NOTE - Exhaust pipe MUST be glued to furnace exhaust fittings. Centrotherm manufactured vent pipe and terminations as NOTE - Exhaust piping should be checked carefully to make sure there are no sags or low spots.
  • Page 54 Use the following steps to correctly size vent pipe diameter. IMPORTANT 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? Standard or concentric?
  • Page 55 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. NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.
  • Page 56 TABLE 24 Continued Maximum Allowable Intake or Exhaust Vent Length in Feet 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 Number 1-1/2”...
  • Page 57 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 58 TYPICAL EXHAUSTAND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS 2” EXHAUST 2” EXHAUST INTAKE INTAKE 2” 2” 2” 2” 3” 3” 045/070 Only 1−1/2” TRANSITION Exhaust 2” Exhaust DO NOT transition from larger to smaller DO NOT transition Exhaust pipe in horizontal runs from smaller to larger...
  • Page 59 Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS The EL296UHV furnace may be installed in either direct HORIZONTAL NON−DIRECT VENT APPLICATIONS (Horizontal Right−Hand Air Discharge Application Shown) vent or non-direct vent applications. In non-direct vent 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 PVC pipe...
  • Page 60 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 61 TABLE 26 Maximum Allowable Exhaust Vent Pipe Length (in ft. )Without Insulation In Unconditioned Space For Winter Design Temperatures Two - Stage High Efficiency Furnace Unit Input Size Winter Design Vent Pipe Temperatures °F (°C) Diameter 1-1/2 in. 32 to 21 2 in.
  • Page 62 ‡ 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 29...
  • Page 63 ‡ 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 63...
  • Page 64 Details of Intake and Exhaust Piping Terminations for TABLE 27 EXHAUST PIPE TERMINATION SIZE REDUCTION Direct Vent Installations EL296UHV Termination NOTE - In Direct Vent installations, combustion air is tak­ MODEL Pipe Size en from outdoors and flue gases are discharged to out­ 1-1/2”...
  • Page 65 sized per table 27. The intake piping may be 8. A multiple furnace installation may use a group of up to equipped with a 90° elbow turndown. Using turndown four terminations assembled together horizontally, as will add 5 feet (1.5m) to the equivalent length of the shown in figure 38.
  • Page 66 2” EXTENSION FOR 2” PVC PIPE1” EXTENSION FOR 3” 12” PVC PIPE EXHAUST (305MM) FURNACE VENT 5-1/2” 5” EXHAUST (140mm) (127MM) INTAKE PIPE 18” MAX. FURNACE Front View (457MM) INTAKE PIPE EXHAUST VENT 12” (305MM) Min. GLUE EXHAUST above grade or END FLUSH INTO average snow TERMINATION...
  • Page 67 2. On field supplied terminations for side wall exit, ex­ NOTE - If necessary the condensate trap may be installed up to 5’ away from the furnace. Use PVC pipe to connect haust piping may extend a maximum of 12 inches trap to furnace condensate outlet.
  • Page 68 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. 26K69; and 50 ft.
  • Page 69 Condensate Trap With Optional Overflow Switch From Evaporator Coil Horizontal Furnace 4” Min. to 5” Max.above condensate drain connection) FurnaceCondensate Drain Connection Optional FIGURE 46 EL296UHV with Evaporatoir Coil Using a Separate Drain (Unit shown in horizontal left-hand discharge position) Field Provided Vent Evaporator (4”...
  • Page 70 EL296UHV with Evaporator IMPORTANT Coil Using a Common Drain Evaporator drain When combining the furnace and evaporator line required coil drains together, the A/C condensate drain Trap at coil is option outlet must be vented to relieve pressure in or­ der for the furnace pressure switch to operate properly.
  • Page 71 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 72 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 73: Start Up

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

  • Page 74: Heating System Service Checks

    All units are CSA design certified without modifications. Gas Leak Detector is strongly recommended. It is available Refer to the EL296UHV(X) Installation Instruction. through Lennox under part number 31B2001. See Corp. B-Gas Piping 8411-L10, for further details. Do not use matches, candles, flame or any other source of ignition to check for gas leaks.
  • Page 75 NOTE- To obtain accurate reading, shut off all other gas G- Proper Combustion Furnace should operate minimum 15 minutes with correct appliances connected to meter. manifold pressure and gas flow rate before checking com­ TABLE 28 bustion. See sections E- and F-. Take combustion sample beyond the flue outlet.
  • Page 76 TABLE 31 Manifold and Supply Line Pressure 0-10,000ft. Supply Line Manifold Pressure in. wg. Pressure in. w.g. EL296 0-4500 ft. 4501-5500 ft. 5501-6500 ft. 6501 - 7500ft. 7501 - 10000ft. 0 - 10000 ft. Unit High High High High High Fire Fire Fire...
  • Page 77 I- Proper Ground and Voltage ings exceed the maximum shown in table 1, make re­ pairs before operating the furnace. A poorly grounded furnace can contribute to premature ig­ 2 - In addition, measure the AC voltage from Line Hot to nitor failure.

  • Page 78: Typical Operating Characteristics

    V-TYPICAL OPERATING CHARACTERISTICS EXTERNAL STATIC PRESSURE A-Blower Operation and Adjustment Supply Duct Static ________ 1 - Blower operation is dependent on thermostat control Return Duct Static + _____ system. Total Duct Static = ________(dry coil) 2 - Generally, blower operation is set at thermostat sub­ base fan switch.
  • Page 79 1 when disassem­ against the data given in the appropriate Lennox bling unit. Use papers or protective covering in front of fur­ Product Specifications bulletin. Additional informa­...
  • Page 80 17 - Remove electrical junction box from the side of the fur­ 40 - Reinstall gas valve manifold assembly. Reconnect nace. gas supply line to gas valve. 41 - Reconnect the combustion air intake pipe. 18 - Mark and disconnect any remaining wiring to heating compartment components.

  • Page 81: Wiring And Sequence Of Operation

    VII- Wiring and Sequence of Operation Page 81...
  • Page 82 EL296UHV With Blower Drive Page 82...
  • Page 83 the combustion air inducer will switch to high fire. After CAUTION a 15 second pre-purge the high fire pressure switch will close and the unit will begin operation on high fire. Failure to use properly sized wiring and circuit After 10 to 20 seconds of high fire operation the unit breaker may result in property damage.
  • Page 84 Applications Using A Single-Stage Thermostat 4 - After the 20-second warm-up period has ended, the gas valve is energized on low fire (first stage) and ignition oc­ See figure 59 for ignition control sequence curs. At the same time, the control module sends a sig­ B - Heating Sequence -- Integrated Control Thermostat nal to begin an indoor blower 30-second ON-delay.
  • Page 85 ® icomfort Wi-Fi Thermostat with EL296UHV ® icomfort Wi-Fi Thermostat with EL296UHV and Non-Communicating Outdoor Unit and icomfortt-ENABLED Outdoor Unit ® ® icomfort Wi-Fi Thermostat icomfort Wi-Fi Thermostat icomfortt-Enabled EL296UHV Indoor Furnace icomfortt-Enabled EL296UHV Indoor Furnace Non-Communicating Outdoor Air Conditioner icomfortt-Enabled Outdoor Air Conditioner or Heat Pump icomfortt- ENABLED...
  • Page 86 ® Optional Accessories for use with any icomfort Touch System ® NOTE: icomfort Wi-Fi THERMOSTAT SENSES HUMIDITY & CON­ TROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED ON 120V CONNECTIONS DEMAND. NO OTHER CONTROL OR HUMIDISTAT REQUIRED. “HUM” CONTACT IS OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HUMIDI­ CLOSED ANYTIME FIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER FUNC­...

  • Page 87: Field Wiring And Jumper Settings

    VIII- EL296UHV Field Wiring Applications With Conventional Thermostat TABLE 33 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 88 TABLE 33 EL296 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 89 TABLE 33 EL296 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 L7724U TERM.
  • Page 90 TABLE 33 EL296 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 L7724U TERM.

  • Page 91: 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 92: 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 WATCHGUARD − SWITCH INDOOR AFTER HEAT FAN LIMIT SWITCH CODE ERROR CODE...
  • Page 93 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 94 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 95 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 96 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:

El296uhv seriesEl296uh045xv36bEl296uh070xv36bEl296uh090xv36cEl296uh090xv48cEl296uh090xv60c ... Show all

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