Lennox EL195UHE Unit Information
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Lennox EL195UHE Unit Information

Lennox EL195UHE Unit Information

El195uhe series units
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See also: User's Information Manual , Instruction and Installation Manual
Service Literature
EL195UHE series units are high−efficiency gas fur-
naces manufactured with Lennox DuralokPlust alumi-
nized steel clamshell−type heat exchangers, with a stainless
steel condensing coil. EL195UHE units are available in
heating input capacities of 44,000 to 132,000 Btuh and
cooling applications from 2 through 5 tons. Refer to Engineer-
ing Handbook for proper sizing.
Units are factory equipped for use with natural gas. A kit is
available for conversion to LP/Propane operation. All
EL195UHE 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 outlined
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 discon-
nect switch(es). Unit may have multiple
power supplies.

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Corp. 1118−L4
Revised 11/2011
EL195UHE SERIES UNITS
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2
Improper installation, adjustment, alteration, service
3
or maintenance can cause property damage, person-
4
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
7
equivalent), service agency or the gas supplier.
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42
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46
Sharp edges.
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Be careful when servicing unit to avoid sharp edges
which may result in personal injury.
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Page 1
EL195UHE
WARNING
WARNING
© 2011 Lennox Industries Inc.
Litho U.S.A.

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Summary of Contents for Lennox EL195UHE

  • Page 1: Table Of Contents

    Units are factory equipped for use with natural gas. A kit is available for conversion to LP/Propane operation. All EL195UHE 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.

  • Page 2: Specifications

    SPECIFICATIONS Model No. EL195UH045XE36B EL195UH070XE36B EL195UH090XE48C Heating AFUE Performance Input - Btuh 44,000 66,000 88,000 Output - Btuh 42,000 63,000 85,000 Temperature rise range - °F 25 - 55 40 - 70 40 - 70 Gas Manifold Pressure (in. w.g.) 3.5 / 10 3.5 / 10 3.5 / 10...

  • Page 3: Optional Accessories

    OPTIONAL ACCESSORIES - MUST BE ORDERED EXTRA “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 CONDENSATE DRAIN KITS Condensate Drain Heat Cable 6 ft.

  • Page 4: Blower Performance Data

    BLOWER DATA EL195UH045XE36B PERFORMANCE (Less Filter) External Air Volume / Watts at Various Blower Speeds Static High Medium-High Medium Medium-Low Pressure Watts Watts Watts Watts Watts in. w.g. 0.00 1345 1255 1150 0.10 1305 1225 1105 0.20 1290 1190 1080 0.30 1275 1150...
  • Page 5 BLOWER DATA EL195UH110XE60C PERFORMANCE (Less Filter) Air Volume / Watts at Different Blower Speeds Bottom Return Air, Side Return Air with Optional Return Single Side Return Air − Air volumes in bold require field External Air Base, Return Air from Both Sides or Return Air from fabricated transition to accommodate 20 x 25 x 1 in.
  • Page 6 EL195UHE 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...

  • Page 7: I−Unit Components

    Shock hazard. Disconnect power before servicing. Control is not field repairable. If control is inoperable, simply re- EL195UHE unit components are shown in figure 1. The place entire control. combustion air inducer, gas valve and burners can be ac- Can cause injury or death. Unsafe operation will re- cessed by removing the outer access panel.
  • 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 (no power) Park terminal for unused speed taps...
  • Page 9 tal of five trials for ignition (including the initial trial), the inte- INTEGRATED CONTROL grated control goes into Watchguard−Flame Failure mode. (Automatic Hot Surface Ignition System) After a 60−minute reset period, the integrated 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 3. Primary Limit Control (Figure 6) limits located on the left and right of the front buner box plate. Primary limit (S10) used on EL195UHE units is located in the S47 is wired to the burner ignition control A92. When ei- heating vestibule panel.
  • Page 11 An 6. Ignitor (Figure 5) LP/Propane changeover kit is available. EL195UHE units use a nitride ignitor made from a propri- MANIFOLD PRESSURE etary ceramic material. To check ignitor, measure its resist- ADJUSTMENT SCREW ance and voltage.
  • Page 12 Measuring Flame Signal Flame Signal In Microamps Normal Drop Out  1.5  0.4 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...
  • Page 13 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 14 7. Combustion Air Inducer (B6) Pressure Switch & Cold End Header Box All EL195UHE units use a combustion air inducer to move air through the burners and heat exchanger during heating operation. The blower uses a shaded pole 120VAC motor. The motor operates during all heating op- eration and is controlled by integrated control A92.
  • Page 15 Measuring Pressure Differential Black Tubing Red Tubing (positive +) (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 4 − Operate unit and observe manometer reading. cycle off.
  • Page 16 TABLE 7 Pressure Switch Troubleshooting Guide Problem Corrective Action Check that the pressure switch is open without the combustion air inducer operat- Pressure switch stuck closed ing. Replace if defective. Pressure switch does not close due to Check for restricted vent. Remove all blockage. obstruction in vent pipe.
  • Page 17 C− Blower Compartment BLOWER WHEEL REPLACEMENT IMPORTANT Center Blower Wheel in Blower Housing Each blower is statically and dynamically bal- anced as an assembly before installation in the unit. ML195UHE 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 18 Multi−Meter (set to VAC) Multi−Meter (set to VAC) Test 1 Test 3 (if necessary) 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 19: Placement And Installation

    II−PLACEMENT AND INSTALLATION IMPORTANT Pipe & Fittings Specifications EL195UHE exhaust and intake connections are All pipe, fittings, primer and solvent cement must conform made of PVC. Use PVC primer and solvent cement with American National Standard Institute and the Ameri- when using PVC vent pipe.

  • Page 20: Joint Cementing Procedure

    TABLE 9 OUTDOOR TERMINATION KITS USAGE STANDARD CONCENTRIC Outdoor Outdoor Flush- 1−1/2" 2" 3" Exhaust Exhaust 2" Wall Plate 3" Wall Plate 2" Wall VENT Accelerator Accelerator Mount Concentric Concentric Concentric Ring Kit EL195 PIPE (Dia. X (Dia. X UNIT DIA.

  • Page 21: Venting Practices

    SCHEDULE 40 PVC − 5’ all other pipe* − 3’ If an EL195UHE furnace replaces a furnace which was commonly vented with another gas appliance, the size of the existing vent pipe for that gas ap- * See table 8 for allowable pipe.

  • Page 22: Vent Piping Guidelines

    Use the following steps to correctly size vent pipe diameter. Vent Piping Guidelines The EL195UHE can be installed as either a Non−Direct Vent or a Direct Vent gas central furnace. NOTE − In Non-Direct Vent installations, combustion air is taken from indoors and flue gases are discharged outdoors.
  • Page 23 TABLE 11 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. Standard Termination at Elevation 0 − 4500 ft 2"...
  • Page 24 TABLE 11 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 2"...
  • Page 25 TABLE 12 Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl Space For Intake Air in Feet Standard Termination at Elevation 0 − 4500 ft 2" Pipe 2−1/2" Pipe 3" Pipe Number Of Model Model...
  • Page 26 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON−DIRECT VENT APPLICATIONS EXHAUST INTAKE EXHAUST INTAKE 2” 2” 2” 2” 3” 3” TRANSITION TRANSITION 2” 2” *2” *2” DO NOT transition from smaller to larger pipe in horizontal runs of exhaust pipe.
  • Page 27 Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS The EL195UHE furnace may be installed in either direct UPFLOW NON−DIRECT VENT APPLICATIONS vent or non−direct vent applications. In non−direct vent applications, when intake air will be drawn into the furnace INTAKE from the surrounding space, the indoor air quality must be...
  • Page 28 The EL195UHE is then classified as a direct vent, maximum volume of combustion air required for Category IV gas furnace.
  • Page 29 TABLE 13 Maximum Allowable Exhaust Vent Pipe Length Without Insulation In Unconditioned Space For Winter Design Temperatures Single − Stage High Efficiency Furnace Unit Input Size Winter Design Vent Pipe Temperatures °F (°C) Diameter 2 in. 32 to 21 2−1/2 in. 0 to −6) 3 in.

  • Page 30: Vent Termination Clearances

    ‡ 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 27...
  • Page 31 ‡ 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 28 Page 31...
  • Page 32 2" (51mm) the velocity of exhaust away from the intake piping. See table 14. *EL195UHE−045, −070 and −090 units with the flush mount termination must use the 1−1/2"accelerator supplied with the kit. NOTE − Care must be taken to avoid recirculation of ex- 3"(76mm) MAX.
  • Page 33 outside wall, the exhaust piping must be terminated 8. A multiple furnace installation may use a group of up to with pipe sized per table 14.The intake piping may be four terminations assembled together horizontally, as equipped with a 90° elbow turndown. Using turndown shown in figure 38.
  • Page 34 FIELD−SUPPLIED WALL TERMINATION OR FIELD−SUPPLIED WALL TERMINATION OR (15F74) WALL RING TERMINATION KIT (15F74) WALL RING TERMINATION KIT With INTAKE ELBOW NOTE − FIELD−PROVIDED NOTE − FIELD−PROVIDED REDUCER MAY BE REDUCER MAY BE 1/2" (13mm) ARMAFLEX 1/2" (13mm) ARMAFLEX REQUIRED TO ADAPT REQUIRED TO ADAPT INSULATION IN UN- INSULATION IN UN-...
  • Page 35 2" EXTENSION FOR 2" PVC PIPE1" EXTENSION FOR 3" 12" PVC PIPE EXHAUST (305mm) FURNACE VENT 5−1/2" 5" (140mm) EXHAUST (127mm) 4’’ 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 36: Snow Accumulation

    WALL TERMINATION KITS (CLOSE−COUPLE) EXTENDED VENT FOR GRADE CLEARANCE 2 inch (51 mm) 22G44 (US) 3 inch (76 mm) 44J40 (US) If intake and exhaust pipe is less than 12 in. (305 mm) above snow accumulation or other obstructions, field− fabricated piping must be installed.
  • Page 37 EL195UHE DIRECT VENT APPLICATION 12" (305mm) MAX. for 2" (51mm) 20" (508mm) MAX. for 3" (76mm) USING EXISTING CHIMNEY 1/2" (13mm) ARMAFLEX STRAIGHT−CUT OR INSULATION IN ANGLE−CUT IN DIRECTION 3"−8" UNCONDITIONED SPACE 1/2" (13mm) OF ROOF SLOPE * (76mm−203mm) ARMAFLEX FIELD−PROVIDED...
  • Page 38 CONDENSATE TRAP AND PLUG LOCATIONS EL195UHE NON−DIRECT VENT APPLICATION (Unit shown in upflow position) USING EXISTING CHIMNEY Trap SIZE TERMINATION STRAIGHT−CUT OR (same on ANGLE−CUT IN DIRECTION PIPE PER TABLE 14. OF ROOF SLOPE right side) 1−1/2 in. EXHAUST VENT 1/2"...
  • Page 39 Heating cable kit is drain separately as condensate drain connection) shown. available from Lennox in various lengths; 6 ft. (1.8m) − kit no. 26K68; 24 ft. (7.3m) − kit no. 26K69; and 50 ft. (15.2m) − kit no. 26K70. Condensate...
  • Page 40 Furnace Condensate Drain Connection Optional Overflow Switch FIGURE 53 To Drain FIGURE 52 EL195UHE with Evaporator Coil Using a Common Drain (Unit shown in horizontal left−hand discharge position) Field−Provided Vent (4" min. to 5" Max. above Evaporator Coil condensate drain connection) 4”min...
  • Page 41 TRAP / DRAIN ASSEMBLY USING 1/2" PVC OR 3/4" PVC 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 Connection In Unit 1 (25 mm) Min.

  • Page 42: Start-Up

    ADJUSTMENT SCREW floor. (under barbed fitting) MANIFOLD The gas valve on the EL195UHE is equipped with a gas PRESSURE control switch. Use only your hand to move the switch. OUTLET Never use tools. If the the switch will not move by hand, PORT replace the valve.

  • Page 43: Heating System Service Checks

    D−Testing Gas Supply Pressure Gas Flow (Approximate) A−C.S.A. Certification TABLE 16 All units are C.S.A. design certified without modifications. GAS METER CLOCKING CHART Refer to the EL195UHE Operation and Installation Instruc- Seconds for One Revolution tion Manual Information. Natural EL195 Unit...
  • Page 44 E−Proper Combustion F−High Altitude NOTE − In Canada, certification for installations at eleva- Furnace should operate minimum 15 minutes with correct tions over 4500 feet (1372 m) is the jurisdiction of local au- manifold pressure and gas flow rate before checking com- thorities.
  • Page 45 G− Proper Ground and Voltage 2 − In addition, measure the AC voltage from Line Hot to Line Neutral (spade terminals) on the integrated con- A poorly grounded furnace can contribute to premature ig- trol. See figure 58. This voltage should be in the range nitor failure.

  • Page 46: Typical Operating Conditions

    4 − Seal the hole when the check is complete. B−Temperature Rise (Figure 59) EXTERNAL STATIC PRESSURE Temperature rise for EL195UHE units depends on unit in- Supply Duct Static put, blower speed, blower horsepower and static pressure Return Duct Static + as marked on the unit rating plate.

  • Page 47: Maintenance

    VI−MAINTENANCE 3 − Check amp−draw using a true RMS meter on the blow- er motor with blower access panel in place. See figure WARNING Unit Nameplate__________Actual__________ ELECTRICAL SHOCK, FIRE, Check Motor Amp Draw OR EXPLOSION HAZARD. Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage.
  • Page 48 12 − Mark and disconnect all combustion air pressure tub- 30 − Reinstall the cold end header box. ing from cold end header collector box. 31 − Reinstall the combustion air inducer. Reconnect the plug to the wire harness. 13 − Mark and remove wires from pressure switch assemb- ly.
  • Page 49 Cleaning the Burner Assembly (if needed) age caused by foreign matter. Remove any blockage. 9 − Reinstall the burner box assembly using the existing 1 − Turn off electrical and gas power supplies to furnace. four screws. Make sure that the burners line up in the Remove upper and lower furnace access panels.

  • Page 50: Sequence Of Operation And Flow Charts

    VII−WIRING DIAGRAM AND SEQUENCE OF OPERATION 1 − Line voltage is applied to L1 and N. the T1 low voltage transformer is energized, and line voltage is applied to B3 indoor blower. 2 − S47 rollout switch(es) must be closed in order for 24V from transformer to be output on integrated control "R" to power thermostat. 3 −...

  • Page 51: Heating Sequence Of Operation

    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 −...
  • Page 52 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE CONTINUED NORMAL HEATING MODE ABNORMAL HEATING MODE 15-SECOND COMBUSTION AIR INDUCER PREPURGE INITIATED BY CLOSED PRESSURE SWITCH. LED FLASHES CODE 13 − LOW LINE VOLTAGE. ONCE VOLTAGE IS ABOVE IGNITOR WARM-UP −− 20 SECONDS. IS VOLTAGE ABOVE 70 VOLTS? 75 VOLTS, HEATING SEQUENCE RESTARTS.

  • Page 53: Troubleshooting: Cooling Sequence Of Operation

    Troubleshooting: Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION NORMAL COOLING MODE ABNORMAL COOLING MODE 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.
  • Page 54 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).

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