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Lennox EL196UHE Series Information

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S e r v i c e L i t e r a t u r e
EL196UHE series units are high-efficiency gas furnaces
manufactured with Lennox DuralokPlus aluminized steel
clamshell-type heat exchangers, with a stainless steel
condensing coil. EL196UHE units are available in heat-
ing input capacities of 30,000 to 110,000 Btuh and cooling
applicationsfrom 2 through 5 tons. Refer to Engineering
Handbook for proper sizing.
Units are factory equipped for use with natural gas. A kit
is available for conversion to LP/Propane operation. All
EL196UHE units are equipped with a hot surface ignition
system. The gas valve is redundant to assure safety shut-
off as required by C.S.A.
The heat exchanger, burners and manifold assembly can
be removed for inspection and service. The maintenance
section gives a detailed description on how this is done.
All specifications are subject to change. Procedures out-
lined in this manual are presented as a recommendation
only and do not supersede or replace local or state codes.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.

Table of Contents

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
II Placement and Installation . . . . . . . . . . . . . . . . . . . . 21
III-Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
VI-Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
UNIT INFORMATION
UNIT INFORMATION
EL196UHE SERIES UNITS
. . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . 43
. . . . . . . . . . . . . . . . . 47
. . . . . . 51
Corp 1805-L1
Revised 08/2022
Improper installation, adjustment, alteration, service
or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a licensed professional HVAC
instale (or equivalent), service agency or the gas
supplier.
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.
Page 1
EL196UHE
WARNING
CAUTION
©2016 Lennox Industries, Inc.

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Summary of Contents for Lennox EL196UHE Series

  • Page 1: Table Of Contents

    S e r v i c e L i t e r a t u r e Revised 08/2022 EL196UHE SERIES UNITS EL196UHE series units are high-efficiency gas furnaces manufactured with Lennox DuralokPlus aluminized steel clamshell-type heat exchangers, with a stainless steel condensing coil.

  • Page 2: Specifications

    SP ECIF ICATIONS Model No. EL196UH030XE36B EL196UH045XE36B EL196UH070XE36B Heating AFUE Performance Input - Btuh 30,000 44,000 66,000 Output - Btuh 29,000 42,800 63,900 Temperature rise range - °F 25 - 55 35 - 65 35 - 65 Gas Manifold Pressure (in. w.g.) 3.5 / 10 3.5 / 10 3.5 / 10...

  • Page 3: Optional Accessories

    OP T IONA L AC C ESSORIES - ORDER SEPARAT ELY “B” Width “C” Width Models Models CABINET ACCESSORIES Horizontal Suspension Kit - Horizontal only 51W10 51W10 Return Air Base - Upflow only 50W98 50W99 High Performance Economizer (Commercial Only) 10U53 10U53 CONDENSATE DRAIN KITS...

  • Page 4: Blower Performance Data

    BLO WER DATA EL196UH030XE36B PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External Static High Medium-High Medium Medium-Low Pressure (Black) (Brown) (Blue) (Yellow) (Red) in. w.g. Watts Watts Watts Watts Watts 0.00 1435 1170 1000 0.10 1400 1130 0.20 1360...
  • Page 5 BLO WER DATA EL196UH090XE48C PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External Static High Medium-High Medium Medium-Low Pressure (Black) (Brown) (Blue) (Yellow) (Red) in. w.g. Watts Watts Watts Watts Watts 0.00 1765 1535 1410 1315 1155 0.10 1735 1500...
  • Page 6 PARTS IDENTIFICATION FLEXIBLE NO-HUB EXHAUST COLLAR BURNER BOX ASSEMBLY TOP CAP GAS VALVE DuralokPlus HEAT EXCHANGER ASSEMBLY COMBUSTION AIR INDUCER BAG ASSEMBLIES (shipping location) PRIMARY LIMIT COLD END OUTER HEADER BOX ACCESS BLOWER PANEL COMBUSTION ASSEMBLY AIR PRESSURE SWITCH BLOWER ACCESS PANEL CONTROL BOX former, circuit breaker and interlock...

  • Page 7: I-Unit Components

    3. Circuit Breaker (CB8) I-UNIT COMPONENTS A 24V circuit breaker is also located in the control box. The ELECTROSTATIC DISCHARGE (ESD) switch provides overcurrent protection to the transform- Precautions and Procedures er (T1). The breaker is rated at 3A at 32V. If the current CAUTION exceeds this limit the breaker will trip and all unit opera- tion will shutdown.
  • Page 8 TABLE 3 1/4” Quick Connect Terminals 120HUM Humidifier 120VAC LINE 120VAC XFMR Transformer 120VAC CIRC Indoor blower 120VAC Indoor air quality accessory 120VAC NEUTRALS Common 120VAC HUM24 Humidifier 24VAC 3/16” Quick Connect Terminals COOL Cooling tap 24VAC HEAT Heating tap 24VAC Continuous blower 24 VAC PARK Park terminal for speed taps...
  • Page 9 After a total of five trials for ignition (including the initial trial), the integrated control goes into Watchguard-Flame IGNITION CONTROL 103217-03 Failure mode. After a 60-minute reset period, the integrat- ed control will begin the ignition sequence again. Fan Time Control - Ignition Control 103217-03 Heating Fan On Time The fan on time of 30 seconds is not adjustable.
  • Page 10 TABLE 5 Ignition Control 107163-01 RED LED Flash Code Diagnostic Codes / Status of Furnace No Power to Control or Board Fault Detected Board Fault Detected Fast Heartbeat Call for Heat / Burner Operation Slow Heartbeat Normal Operation – Idle, Continuous Fan, or Cool 1 Flash Reverse Line Voltage Polarity or Phasing of 120V power 2 Flashes...
  • Page 11 Burner Box Assembly Burner Assembly Rollout Switch(s) Flame Sensor Ignitor Gas Valve Burner Box Front FIGURE 6 B-Heating Components The combustion air inducer pulls fresh air through the burner box. This air is mixed with gas in the burners. The Combustion air inducer (B6), primary limit control (S10), gas / air mixture is then burned at the entrance of each ignitor, burners, flame rollout switch (S47), gas valve...
  • Page 12 5. Flame Sensor (FIGURE 6) Primary Limit Location and Heat Exchanger A flame sensor is located on the left side of the burner support. The sensor is mounted on the front burner box plate and the tip protrudes into the flame envelope of the leftmost burner.
  • Page 13 Measuring Flame Signal Flame Signal In Microamps Normal Drop Out 0.5 - 1.4 Flame Sensor Wire Remove sensor from integrated control and connect alligator clip (−) to flame sensor lead. Multi−Meter Intergrated Control Set Dial to DC MicroAmps Flame Sensor Terminal (−) T o Flame Terminal...
  • Page 14 Test 1 Check ignitor circuit for correct resistance. Remove 4-pin plug from control. Check ohms reading across terminals 2 and 4. 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 15 -110 1.040” TABLE 7 8. Combustion Air Pressure Switch (FIGURE 11) Altitude ft. EL196UHE series units are equipped with a differential 0-4500 4501-7500 7501-10000 Unit pressure switch located on the cold end header box. The...
  • Page 16 Measuring Pressure Differential Black Tubing (positive +) Red and Black Tubing or Red Tubing (negative -) To Cold End Header Box To Cold End Header Box Field Provided Tubing To Pressure Switch “+” High “-” 1 - Remove thermostat demand and allow unit to cycle off.
  • Page 17 TABLE 8 Problem Corrective Action Check that the pressure switch is open without the com- Pressure switch stuck closed bustion air inducer operating. Replace if defective. Pressure switch does not close due to obstruction in vent Check for restricted vent. Remove all blockage. Check for pipe.
  • Page 18 C- Blower Compartment BLOWER WHEEL REPLACEMENT IMPORTANT Center Blower Wheel in Blower Housing Each blower is statically and dynamically balanced as an assembly before installation in the unit. EL196UHE units are equipped with a constant torque ECM motor. It has a DC motor coupled to an electronic control module both contained in the same motor housing.
  • Page 19 Multi−Meter (set to VAC) Multi−Meter (set to VAC) Test 1 Test 3 (if necesssary) Turn on power to unit. Check for 120 volts across terminals Check for 120 volts across terminals “CIRC” and “Neutrals” “L” and “N” on input plug P48. If voltage is present continue on the integrated control.
  • Page 20 Replacing the Motor Module Motor Test 1 - Disconnect electrical power to unit. 2 - Remove unit access panel. 3 - Unplug the two harnesses from the motor control module. See FIGURE 18. 4 - Remove the two hex head bolts securing the motor control module to the motor (see FIGURE 19).

  • Page 21: Placement And Installation

    II-PLACEMENT AND INSTALLATION IMPORTANT Pipe & Fittings Specifications Exhaust and intake connections are made of PVC. Use PVC primer and solvent cement when using All pipe, fittings, primer and solvent cement must conform PVC vent pipe. When using ABS vent pipe, use with American National Standard Institute and the Ameri- transitional solvent cement to make connections to can Society for Testing and Materials (ANSI/ASTM) stan-...
  • Page 22 TABLE 11 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Wall Kit 1-1.2 inch 2 inch 3 inch Flush Mount Kit 2 inch 3 inch Vent Pipe 71M80 69M29 Input Size Field Fabri- 60L46 (US) 51W11 22G44 Dia. in. (US) (US) 44J40 (US) cated 44W93 (US)
  • Page 23 NOTE - Assembly should be completed within 20 REPLACING FURNACE THAT WAS PART OF A seconds after last application of cement. Hammer COMMON VENT SYSTEM blows should not be used when inserting pipe. 8 - After assembly, wipe excess cement from pipe at CHIMNEY OR GAS end of fitting socket.
  • Page 24 TABLE 12 Vent Piping Guidelines MINIMUM VENT PIPE LENGTHS NOTE - Lennox has approved the use of DuraVent® and Centrotherm manufactured vent pipe and terminations EL196UHE Model MIN. VENT LENGTH* as an option to PVC. When using the PolyPro by Du- ®...
  • Page 25 TABLE 13 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 26 TABLE 12 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. 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 27 TABLE 14 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 - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.
  • Page 28 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” 030/045/070 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 29 Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS UPFLOW NON−DIRECT The EL196UHE furnace may be installed in either direct VENT APPLICATIONS vent or non-direct vent applications. In non-direct vent ap- plications, when intake air will be drawn into the furnace INTAKE from the surrounding space, the indoor air quality must be DEBRIS SCREEN...
  • Page 30 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 and the flue gases are discharged to the out- combustion air coming in from a space serviced by an doors.
  • Page 31 TABLE 15 Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For Winter Design Temperatures Single - Stage High Efficiency Furnace Vent Unit Input Size Winter Design Pipe Temp °F (°C) Diam 1-1/2 in 32 to 21 2 in (0 to -6) 2-1/2 in...
  • Page 32 ‡ 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 33 ‡ 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 34 Page 33...
  • Page 34 Details of Intake and Exhaust Piping Terminations for NOTE - Care must be taken to avoid recirculation of Direct Vent Installations exhaust back into intake pipe. 5 - On field-supplied terminations for side wall exit, NOTE - In Direct Vent installations, combustion air is taken exhaust piping may extend a maximum of 12 inches from outdoors and flue gases are discharged to outdoors.
  • Page 35 7 - If intake and exhaust piping must be run up a side wall to position above snow accumulation or other FIELD-PROVIDED obstructions, piping must be supported. At least Accelerator not required REDUCER MAY BE for 3” concentric one bracket must be used within 6” from the top of REQUIRED TO ADAPT DIFFERENT VENT PIPE the elbow and then every 24”...
  • Page 36 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT LARGER VENT PIPE SIZE Vent Pipe Vent Pipe TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
  • Page 37 Details of Exhaust Piping Terminations for Non-Direct NON-DIRECT VENT APPLICATION Vent Applications USING EXISTING CHIMNEY Exhaust pipes may be routed either horizontally through STRAIGHT-CUT OR ANGLE-CUT IN DIRECTION an outside wall or vertically through the roof. In attic or OF ROOF SLOPE closet installations, vertical termination through the roof is preferred.
  • Page 38 Heating cable kit is above 2” may result in a flooded heat exchanger available from Lennox in various lengths; 6 ft. (1.8m) - if the combined primary drain line were to become kit no. 26K68 and 24 ft. (7.3m) - kit no. 26K69.
  • Page 39 CONDENSATE TRAP LOCATIONS Condensate Trap With Optional Overflow Switch (Unit shown in upflow position with remote trap) From Evaporator Coil HorizontalFurnace4” Min. to 5” Max.above Field ProvidedVent condensatedrain connection) Min. 1” Above Condensate Drain Connection 1” Min. 2” Max. FurnaceCondensate DrainConnection *5’...
  • Page 40 Furnace with Evaporator Coil Using a Separate Drain (Unit shown in horizontal left-hand discharge position) Field Provided Vent Evaporator (4” min. to 5” max. above Coil condensate connection) 4”min 5”max 5’ max. PVC Pipe Only Condensate Drain Connection (Trap at coil is optional) Drain Pan Piping from furnace and evaporator coil must slope down a minimum 1/4”...
  • Page 41 TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC 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 Connection In Unit 1 (25 mm) Min.

  • Page 42: Iii-Start-Up

    III-START-UP 2 - Set the thermostat to the lowest setting. 3 - Turn off all electrical power to the unit. A-Preliminary and Seasonal Checks 4 - This furnace is equipped with an ignition device 1 - Inspect electrical wiring, both field and factory which automatically lights the burners.

  • Page 43: Iv-Heating System Service Checks

    “-”. specialty Gas Leak Detector is strongly recommended. It 3 - Start unit and let run for 5 minutes to allow for steady is available through Lennox under part number 31B2001. state conditions. See Corp. 8411-L10, for further details.
  • Page 44 Negative Barbed Fitting (remove for manifold adjustment) (−) 2” Long Square Tubing (remove for manifold adjustment) Manifold Pressure Outlet Gas Valve Regulator Vent Hose (to burner box) Barbed Fitting 10” Long Square Tubing Measuring Device FIGURE 57 E-Proper Combustion F-High Altitude Furnace should operate minimum 15 minutes with correct NOTE - In Canada, certification for installations at eleva- manifold pressure and gas flow rate before checking com-...
  • Page 45 TABLE 19 Manifold and Supply Line Pressure 0-10,000ft. Manifold Pressure in. wg. Supply Line Pressure EL196 in. w.g. Unit 0 - 4500 ft 4501 - 5500 ft 5501 - 6500 ft 6501 - 7500 ft 7501 - 10,000 ft 0 - 10000 ft. Natural 13.0 Models...
  • Page 46 G- Proper Ground and Voltage 2 - In addition, measure the AC voltage from Line Hot to Line Neutral (spade terminals) on the integrated WARNING control. See FIGURE 58. This voltage should be in the range of 97 to 132 Vac Electric Shock Hazard.

  • Page 47: V-Typical Operating Conditions

    V-TYPICAL OPERATING CHARACTERISTICS C-External Static Pressure 1 - Tap locations shown in FIGURE 60. A-Blower Operation and Adjustment1 2 - Punch a 1/4” diameter hole in supply and return NOTE- The following is a generalized procedure and does air plenums. Insert manometer hose flush with not apply to all thermostat controls.

  • Page 48: Vi-Maintenance

    True RMS Meter Before using any filter with this system, check the specifications provided by the filter manufacturer against the data given in the appropriate Lennox Product Specifications bulletin. Additional information is provided in Service and Application Note ACC002 (August 2000).
  • Page 49 Winterizing and Condensate Trap Care 11 - Disconnect condensate drain tubing from flue collar. Remove screws that secures the flue collar 1 - Turn off power to the furnace. into place. Remove flue collar. It may be necessary 2 - Have a shallow pan ready to empty condensate to cut the exiting exhaust pipe for removal of the water.
  • Page 50 31 - Reinstall the combustion air inducer. Reconnect the Cleaning the Burner Assembly (if needed) plug to the wire harness. 1 - Turn off electrical and gas power supplies to furnace. 32 - Reinstall pressure switches and reconnect pressure Remove upper and lower furnace access panels. switch wiring.

  • Page 51: Vii-Sequence Of Operation And Flow Charts

    VII-WIRING DIAGRAM AND SEQUENCE OF OPERATION Line voltage is applied to L1 and N. the T1 low voltage transformer is energized, and line voltage is applied to B3 indoor blower. S47 rollout switch(es) must be closed in order for 24V from transformer to be output on integrated control ”R” to power thermostat. When there is a call for heat, W1 of the thermostat energizes W of the furnace control with 24VAC.
  • Page 52 Heating Sequence of Operation HEATING SEQUENCE OF OPERATION ABNORMAL HEATING MODE NORMAL HEATING MODE POWER ON GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER DELAY OFF. CONTROL SELF-CHECK OKAY? LED SLOW FLASH (RESET CONTROL BY TURNING MAIN POWER OFF.) LED FLASHES CODE 1 - POLARITY REVERSED.
  • Page 53 Heating Sequence of Operation Continued HEATING SEQUENCE CONTINUED 15 SECOND COMBUSTION AIR INDUCER PREPURGE INITIATED BY CLOSED PRESSURE SWITCH. LED FLASHES CODE 13 - LOW LINE VOLTAGE. ONCE VOLTAGE IS ABOVE IS VOLTAGE ABOVE 70 VOLTS? IGNITOR WARM UP -- 20 SECONDS. 75 VOLTS, HEATING SEQUENCE RESTARTS.
  • Page 54 Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION POWER ON IGNITION CONTROL MAIN POWER ON. GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF WITH NORMAL DELAY. CONTROL SELF DIAGNOSTIC CHECK. SIGNAL CIRCUIT BOARD FAILURE AT LED. IS CONTROL OPERATING NORMALLY? INTERRUPT MAIN POWER TO RESET CONTROL.
  • Page 55 Continuous Fan / Accessories Sequence of Operation CONTINUOUS FAN SEQUENCE OF OPERATION LED: SLOW FLASH RATE REMAINS UNCHANGED THROUGHOUT SEQUENCE. MANUAL FAN SELECTION MADE AT THERMOSTAT. CONTROL (G) ENERGIZES SYSTEM FAN AT FAN SPEED. EAC TERMINAL IS ENERGIZED. THERMOSTAT CALLS FOR HEAT (W). SYSTEM FAN CONTINUES FAN SPEED WITHOUT THERMOSTAT CALLS FOR COOLING.

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