Lennox EL195UHNE Series Manual
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Lennox EL195UHNE Series Manual

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S e r v i c e L i t e r a t u r e
EL195UHE series units are high-efficiency gas furnaces
available in heating input capacities of 40,000 to 100,000
Btuh and cooling applications from 2 through 5 tons.
Refer to Engineering Handbook for proper sizing.
Units are factory equipped for use with natural gas. All
EL195UHNE units are equipped with a hot surface igni-
tion 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
Blower Performance Data . . . . . . . . . . . . . . . . . . . . . . 4
I-Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
II Placement and Installation . . . . . . . . . . . . . . . . . . . . 17
III-Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
IV-Heating System Service Checks . . . . . . . . . . . . . . 39
V-Typical Operating Characteristics . . . . . . . . . . . . . . 45
VI-Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
UNIT INFORMATION
UNIT INFORMATION
Corp 1801-L1
Revised 09/2021
EL195UHNE SERIES UNITS
. . . . . . 49
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.
EL195UHNE
adjustment,
alteration,
©2016 Lennox Industries, Inc.

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Summary of Contents for Lennox EL195UHNE Series

  • Page 1: Table Of Contents

    Corp 1801-L1 S e r v i c e L i t e r a t u r e Revised 09/2021 EL195UHNE SERIES UNITS EL195UHE series units are high-efficiency gas furnaces available in heating input capacities of 40,000 to 100,000 Btuh and cooling applications from 2 through 5 tons.

  • Page 2: Specifications

    SP ECIF ICATIONS Model No. EL195UH040NE36B EL195UH060NE36B Heating AHRI Ref. No. 201834895 201834898 Performance AFUE Input - Btuh 40,000 60,000 Output - Btuh 39,000 58,000 Temperature rise range - °F 30 - 60 35 - 65 Gas Manifold Pressure (in. w.g.) 3.5 / N/A 3.5 / 4.0 Nat.

  • Page 3: Optional Accessories

    OPT IONAL AC C ESSORIES - ORD ER 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 Condensate Drain Heat Cable...

  • Page 4: Blower Performance Data

    BLO WER DATA EL195UH040NE36B 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 1450 1280 1190 0.10 1429 1268 1171 0.20...
  • Page 5 BLO WER DATA EL195UH100NE60C PERFORMANCE (Less Filter) Air Volume / Watts at Different Blower Speeds Single Side Return Air − Air volumes in bold (over Bottom Return Air, Side Return Air with Return Air from 1800 cfm) require Optional Return Air Base and field External Both Sides or Return Air from Bottom and One Side.
  • Page 6 PARTS IDENTIFICATION Exhaust Pipe Inlet Air Assembly Heat Exchanger Rollout Switch Burner Assembly Intake Air Pipe Gas Valve Combustion Gas Pipe Inlet Air Inducer (right side only) Ignition Control Ignition Control FIGURE 1 Page 6...

  • Page 7: I-Unit Components

    I-UNIT COMPONENTS 4. Integrated Ignition Control (A92) WARNING ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures Shock hazard. CAUTION Disconnect power before servicing. Control is not Electrostatic discharge affect electronic field repairable. If control is inoperable, simply components. Take precautions neutralize replace entire control. Can cause injury or death. electrostatic charge by touching your hand and Unsafe operation will result if repair is attempted.
  • 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 INTEGRATED CONTROL trial), the integrated control goes into Watchguard-Flame (Automatic Hot Surface Ignition System) Failure mode. After a 60-minute reset period, the integrat- ed control will begin the ignition sequence again. Fan Time Control Heating Fan On Time The fan on time of 30 seconds is not adjustable.
  • Page 10 SureLight control will go into Watch guard for one hour. The switch is factory set and cannot be adjust- ed. The switch may have a different set point for each unit model number. See Lennox Repair Parts Handbook if limit switch must be replaced. Page 10...
  • Page 11 4. Gas Valve (Figure 6) 5. Flame Sensor (Figure 5) The EL195UHNE uses an internally redundant valve to A flame sensor is located on the top of the air gas plenum. assure safety shut-off. If the gas valve must be replaced, The sensor can be removed for service without remov- the same type valve must be used.
  • Page 12 Ignitor Check Out (exploded view for clarity) Test 1 Remove 5-pin plug from control Check ohms reading across terminals 1and 5 Ohm value should be between 39 - 70. Meter (set to ohms) Integrated control detail Test 2 Seperate the 2-pin jack plug near the manifold and check resistance of the ignitor.
  • Page 13 EL195UHNE series units are equipped with a differential the switch. The pressure switch opens if the differential pressure switch located on the cold end header box. The drops below the set point.
  • Page 14 C- Blower Compartment ALIGN AND TIGHTEN SET SCREW WITH FLAT SIDE OF MOTOR SHAFT IMPORTANT Each blower is statically and dynamically balanced as an assembly before installation in the unit. Set Screw Housing Hub ML195UHE units are equipped with a constant torque ECM motor.
  • Page 15 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 16 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 14. 4 - Remove the two hex head bolts securing the motor control module to the motor (see figure 15).

  • Page 17: Placement And Installation

    II-PLACEMENT AND INSTALLATION TABLE 9 PIPING AND FITTINGS SPECIFICATIONS Pipe & Fittings Specifications Schedule 40 PVC (Pipe) D1785 All pipe, fittings, primer and solvent cement must conform Schedule 40 PVC (Cellular Core with American National Standard Institute and the Ameri- F891 Pipe) can Society for Testing and Materials (ANSI/ASTM) stan-...
  • Page 18 TABLE 10 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Wall Kit 1-1.2 inch 2 inch 3 inch Flush Mount Vent Pipe 2 inch 3 inch Input Size Field 71M80 (US) 69M29 (US) 60L46 (US) Dia. in. 51W11 (US) Fabricated 44W92 44W92 44W93 22G44 (US) 44J40 (US) 51W12...
  • Page 19 Exhaust Piping (Figures 20, 23 and 24) Venting Practices The vent adapter must be attached to the exhaust cou- pling on the furnace top panel. Use provided bands. See Piping Suspension Guidelines steps below. SCHEDULE 40 1 - Remove the caution tag from vent adapter. PVC - 5' 2 - Fully insert vent adapter with both bands loosely all other pipe* - 3'...
  • Page 20 TABLE 11 Vent Piping Guidelines MINIMUM VENT PIPE LENGTHS NOTE - Lennox has approved the use of DuraVent® and Centrotherm manufactured vent pipe and terminations EL195UH Model MIN. VENT LENGTH* as an option to PVC. When using the PolyPro® by Du- 15 ft.
  • Page 21 TABLE 12 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 22 TABLE 12 Continued 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 23 TABLE 13 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 24 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS EXHAUST EXHAUST INTAKE 2” 2” 2” 2” 3” Appliance TRANSITION Appliance Adaptor 2” Adaptor DO NOT transition *2” from smaller to larger 2” 3” pipe in horizontal runs *2”...
  • Page 25 Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS UPFLOW NON−DIRECT The EL195UHNE furnace may be installed in either direct VENT APPLICATIONS 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 and Ventilation Air section must be followed.
  • Page 26 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 27 TABLE 14 Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For Winter Design Temperatures Single - Stage High Efficiency Furnace Unit Input Size Winter Design Vent Temp °F (°C) Pipe Diam 32 to 21 2 in (0 to -6) 3 in 20 to 1...
  • Page 28 ‡ 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 29 ‡ 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 29...
  • Page 30 Details of Intake and Exhaust Piping Terminations for Exiting Exhaust and Intake Vent Direct Vent Installations (different pressure zone) NOTE - In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged to outdoors. NOTE - Flue gas may be slightly acidic and may adverse- ly affect some building materials.
  • Page 31 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 one Accelerator not required REDUCER MAY BE for 3” concentric bracket must be used within 6” from the top of the REQUIRED TO ADAPT DIFFERENT VENT PIPE elbow and then every 24”...
  • Page 32 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 33 Crawl Space and Extended Horizontal Venting plate or average snow SHOULDER OF FITTINGS accumulation PROVIDE SUPPORT Lennox provides kit 51W18 (USA) kit 15Z70 (Canada) to OF PIPE ON TOP PLATE SHEET install 2” or 3” PVC exhaust piping through the floor joists METAL TOP PLATE and into the crawl space.
  • Page 34 NOTE - In upflow applications where side return the condensate trap and line. Heating cable kit is available from Lennox in various lengths; 6 ft. sate trap, filter rack must be installed beyond (1.8m) - kit no. 26K68 and 24 ft. (7.3m) - kit no.
  • Page 35 Furnace With Evaporator Condensate Trap With Optional Overflow Switch Coil Using A Separate Drain From Evaporator Coil HorizontalFurnace4” Min. to 5” Max.above Evaporator drain condensatedrain connection) line required (Trap at coil is optional) Field Provided Vent FurnaceCondensate (1” min. 2” max. above DrainConnection condensate connection) Optional...
  • Page 36 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 37 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 38: Iii-Start-Up

    III-START-UP 3 - Turn off all electrical power to the unit. 4 - This furnace is equipped with an ignition device A-Preliminary and Seasonal Checks which automatically lights the burners. Do not try to 1 - Inspect electrical wiring, both field and factory light the burners by hand.

  • Page 39: Iv-Heating System Service Checks

    Gas Leak Detector is strongly recommended. It unit. Refer to the changeover kit installation instruction for the conversion proce- is available through Lennox under part number 31B2001. dure and manifold pressure measure procedure. See Corp. 8411-L10, for further details.
  • Page 40 Manifold and Signal Pressure Measurement Air Orifice Replacement To correctly measure manifold and signal pressure, follow Do not replace the air orifice until the problem has been the steps below: determined. If the unit has difficulty igniting the orifice is oversized and brings in too much air.
  • Page 41 REMOVE SCREWS Screws Screw FIGURE 54 Air Orifice Replacement Gray Coupling Air Orifice and Part Number Air Intake Coupling FIGURE 55 Page 41...
  • Page 42 Operating Signal Pressure Measurement FIGURE 56 TABLE 19 Production Resonance (more air) Difficulty Igniting (less air) Single-Stage Orifice Size (Part No) Orifice Size Cat No Orifice Size Cat No -040 0.800 (16) 0.812 (01) 21U23 0.787 (20) 21U01 -060 0.995 (14) 1.010 (21) 21U02 0.980 (13)
  • Page 43 Troubleshooting Poor Ignition or Combustion Resonance Issues Check Air Orifice See Figure 55. Check the following 1-Does the unit have the correct air orifice size? See table 19. 2 -Is the orifice fully seated tight against the elbow ? way? 4 - Is the air inlet screen clear of any obstruction ? Correct any problems found.
  • Page 44 E-Proper Combustion A poorly grounded furnace can contribute to premature ignitor failure. Use the following procedure to check for Furnace should operate minimum 15 minutes with correct ground and voltage to the integrated control. manifold pressure and gas flow rate before checking com- 1 - Measure the AC voltage between Line Neutral bustion.

  • Page 45: V-Typical Operating Characteristics

    V-TYPICAL OPERATING CHARACTERISTICS C-External Static Pressure A-Blower Operation and Adjustment1 1 - Tap locations shown in figure 60. 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 46: Vi-Maintenance

    13 - Verify operation of CO detectors and replace At the beginning of each heating season, and to comply batteries as required. with the Lennox Limited Warranty, your system should be Perform a general system test. Turn on the furnace to checked as follows:...
  • Page 47 Winterizing and Condensate Trap Care 5 - Disconnect gas supply piping. Remove the screw securing the air fuel plenum and remove along with 1 - Turn off power to the unit. the air inake assembly as one component. 2 - Have a shallow pan ready to empty condensate 6 - Remove screws from both sides, top and bottom of water.
  • Page 48 BURNER, C.A.I ASSEMBLY & HEAT EXCHANGER REMOVAL Heat Exchanger Gaskets Burner Box Air Gas Plenum Burner High Temperature Switch (location) Ignitor Primary Limit Sensor O Ring Gas Valve Gas Orifice FIGURE 62 Page 48...

  • Page 49: 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 50 Troubleshooting: 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 IS POLARITY CORRECT? REVERSED.
  • Page 51 Troubleshooting: 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 52 Troubleshooting: Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION POWER ON IGNITION CONTROL MAIN POWER ON. LED FLASHES STEADY - CIRCUIT BOARD FAILURE CONTROL SELF DIAGNOSTIC CHECK. GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. IS CONTROL OPERATING NORMALLY? INDOOR BLOWER OFF WITH NORMAL DELAY. INTERRUPT MAIN POWER TO RESET CONTROL.
  • Page 53 Troubleshooting: Continuous Fan / Accessories Sequence of Operation CONTINUOUS FAN / ACCESSORIES 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).

This manual is also suitable for:

El195uh040ne36bEl195uh060ne36bEl195uh080ne48cEl195uh100ne60c

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