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Lennox ELITE EL297UH070XV36B Installation Instructions Manual

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© 2023 Lennox Industries Inc.
Dallas, Texas USA
HORIZONTAL LEFT
CAUTION
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.

Table of Contents

Unit Dimensions - inches (mm) .....................................2
Shipping and Packing List ..............................................3
Safety Information ..........................................................3
Use of Furnace as Construction Heater .........................4
General ...........................................................................5
Shipping Bolt Removal ...................................................8
Installation - Setting Equipment ......................................8
Filters ............................................................................13
Duct System .................................................................13
Pipe & Fittings Specifications .......................................14
Joint Cementing Procedure ..........................................15
Venting Practices ..........................................................16
Gas Piping ....................................................................36
Electrical .......................................................................39
AIR FLOW
UPFLOW
HORIZONTAL RIGHT
INSTALLATION
INSTRUCTIONS
EL297UHV
ELITE
SERIES GAS FURNACE
®
UP/FLOW HORIZONTAL AIR DISCHARGE
508358-01
05/2023
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
This is a safety alert symbol and should never be
ignored. When you see this symbol on labels or in man-
uals, be alert to the potential for personal injury or death.
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 installer or
equivalent, service agency, or the gas supplier.
A thermostat is not included and must be ordered
separately.
A communicating
communicating applications.
In
non-communicating
ComfortSense® 7500 thermostat may be used, as well
as other non-communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
which begin on Page 41.
Integrated Control .........................................................51
Blower Data ..................................................................54
On-Board Links.............................................................58
Unit Start Up .................................................................60
Gas Pressure Adjustment .............................................61
Proper Combustion.......................................................62
High Altitude .................................................................62
Repair Parts..................................................................63
Other Unit Adjustments.................................................64
Heating Sequence of Operation ...................................63
Service..........................................................................66
Program Unit Capacity/Size Mode ...............................68
Page 1
WARNING
NOTICE
thermostat
must
be
applications,
the
used
in
Lennox

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Summary of Contents for Lennox ELITE EL297UH070XV36B

  • Page 1: Table Of Contents

    INSTALLATION INSTRUCTIONS EL297UHV © 2023 Lennox Industries Inc. Dallas, Texas USA ELITE SERIES GAS FURNACE ® UP/FLOW HORIZONTAL AIR DISCHARGE 508358-01 05/2023 THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE This is a safety alert symbol and should never be ignored.

  • Page 2: Unit Dimensions - Inches (Mm)

    Unit Dimensions - inches (mm) NOTE - 60C and 60D size units that require air volumes over 1800 cfm must have one of the following: 1. Single side return air and Optional Return Air Base with transition that must accommodate required 20 x 25 x 1 inch (508 x 635 x 25 mm) air filter to EXHAUST AIR 3-1/4...

  • Page 3: Shipping And Packing List

    EL297UHV Gas Furnace Shipping and Packing List The EL297UHV Category IV gas furnace is shipped ready Package 1 of 1 contains for installation in the upflow or horizontal position. The fur- 1 - Assembled EL297UHV unit nace is shipped with the bottom panel in place. The bot- 1 - Bag assembly containing the following: tom panel must be removed if the unit is to be installed in horizontal or upflow applications with bottom return air.

  • Page 4: Use Of Furnace As Construction Heater

    In order to ensure proper unit operation in non-direct vent applications, combustion and ventilation air supply must Heating Unit Installed Parallell to Air Handler Unit Dampers be provided according to the current National Fuel Gas (open during heating operation only) Code or CSA-B149 standard.

  • Page 5: General

    FAILURE TO FOLLOW THE ABOVE INSTALLATION IN- Water softening chemicals STRUCTIONS VOIDS THE MANUFACTURER’S EQUIP- De-icing salts or chemicals MENT LIMITED WARRANTY. LENNOX DISCLAIMS ALL LIABILITY IN CONNECTION WITH INSTALLER’S Carbon tetrachloride FAILURE TO FOLLOW THE ABOVE INSTALLATION IN- Halogen type refrigerants STRUCTIONS.
  • Page 6 When the furnace is installed so that supply ducts carry CAUTION air circulated by the furnace to areas outside the space containing the furnace, the return air must be handled by Do not install the furnace in a corrosive or contaminated ducts which are sealed to the furnace casing and which atmosphere.
  • Page 7 Air from Outside EQUIPMENT IN CONFINED SPACE (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside) If air from outside is brought in for combustion and ventila- tion, the confined space shall be provided with two perma- nent openings. One opening shall be within 12” (305mm) Roof Terminated of the top of the enclosure and one within 12”...

  • Page 8: Shipping Bolt Removal

    The bolt and washer must be removed before the furnace EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE is placed into operation. After the bolt and washer have (All Air Through Ventilated Attic) been removed, the rigid leg will not touch the blower hous- ing.
  • Page 9 SETTING EQUIPMENT UPFLOW APPLICATION Place level on blower Place level on the front blower deck screws to check deck to check side to side forward tilt UNIT FRONT AIR FLOW 1/2” max. SIDE VIEW HORIZONTAL APPLICATION UNIT FRONT AIR FLOW 1/2”...
  • Page 10 Return Air Guidelines WARNING Return air can be brought in through the bottom or either Improper installation of the furnace can result in side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make personal injury or death.
  • Page 11 Optional Return Air Base CONDENSATE (Upflow Applications Only) TRAP FURNACE FRONT 23 (584) 3−1/4 IF BASE Overall (83) IS USED (Maximum) Minimum WITHOUT 11 (279) IAQ CABINET, Maximum 22−7/16 INDOOR AIR A SINGLE Unit side return air 14 (356) QUALITY (570) RETURN AIR Opening...
  • Page 12 Figure 19. A horizontal sus- 6 - Continue with exhaust, condensate and intake pension kit (51W10) may be ordered from Lennox or use piping installation according to instructions. equivalent. NOTE - Heavy-gauge sheet metal straps may be used to suspend the unit from roof rafters or ceiling joists.

  • Page 13: Filters

    Lennox Product pulled back down the vent pipe and into the room. This Specifications bulletin. Additional information is provided...

  • Page 14: Pipe & Fittings Specifications

    CAUTION Pipe & Fittings Specifications All pipe, fittings, primer and solvent cement must conform Solvent cements for plastic pipe are flammable liquids with American National Standard Institute and the Ameri- and should be kept away from all sources of ignition. can Society for Testing and Materials (ANSI/ASTM) stan- Do not use excessive amounts of solvent cement when dards.

  • Page 15: Joint Cementing Procedure

    TABLE 3 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Wall Kit 1-1.2 inch 2 inch 3 inch Flush Mount Vent Pipe Dia. 2 inch 3 inch Input Size Field 71M80 (US) 69M29 (US) 60L46 (US) 51W11 (US) Fabricated 22G44 (US) 44J40 (US) 444W92 (CA) 444W92 (CA) 444W93 (CA)

  • Page 16: Venting Practices

    NOTE - Assembly should be completed within 20 Conduct the following test while each appliance is oper- ating and the other appliances (which are not operating) seconds after last application of cement. Hammer blows should not be used when inserting pipe. remain connected to the common venting system.
  • Page 17 Figure 22 Vent Piping Guidlines NOTE - Lennox has approved the use of DuraVent® and TABLE 4 Centrotherm manufactured vent pipe and terminations MINIMUM VENT PIPE LENGTHS as an option to PVC.
  • Page 18 IMPORTANT Piping Size Process Do not use screens or perforated metal in exhaust or intake terminations. Doing so will cause freeze-ups and What is the may block the terminations. furnace capacity? Which style termination being used? Standard or concentric? Which needs most elbows? Intake or exhaust?
  • Page 19 TABLE 5 Maximum Allowable Intake or Exhaust Vent Length in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size Standard Termination at Elevation 0 - 4500 ft No Of 1-1/2”...
  • Page 20 TABLE 5 Continued Maximum Allowable Intake or Exhaust Vent Length in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size. Concentric Termination at Elevation 0 - 4500 ft No Of 1-1/2”...
  • Page 21 TABLE 6 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 22 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS 2” EXHAUST EXHAUST INTAKE INTAKE 2” 2” 2” 2” 2” 3” 3” 045/070 Only 1−1/2” TRANSITION Exhaust 2” 6” Min Exhaust DO NOT transition from larger to smaller DO NOT transition pipe in horizontal runs from smaller to larger...
  • Page 23 Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS The EL297UHV 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 and Ventilation Air section must be followed.
  • Page 24 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 an gases are discharged to the outdoors.
  • Page 25 TABLE 7 Maximum Allowable Exhaust Vent Pipe Length (in ft. ) Without Insulation In Unconditioned Space For Winter Design Temperatures Two - Stage High Efficiency Furnace Winter Design Unit Input Size Vent Pipe Temperatures1 °F Diameter (°C) 1-1/2 32 to 21 2 in (0 to -6) 2-1/2 in...
  • Page 26 ‡ 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 27 ‡ 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 32 Page 27...
  • Page 28 Details of Intake and Exhaust Piping Terminations for any direction. When exhaust and intake piping must be run up an outside wall, the exhaust piping Direct Vent Installations must be terminated with pipe sized per table 8.The intake piping may be equipped with a 90° elbow NOTE - In Direct Vent installations, combustion air is taken turndown.
  • Page 29 TABLE 8 EXHAUST PIPE TERMINATION SIZE REDUCTION FIELD-PROVIDED Accelerator not required REDUCER MAY BE EL297UHV Termination for 3” concentric REQUIRED TO ADAPT DIFFERENT VENT PIPE MODEL Pipe Size OUTSIDE SIZE TO TERMINATION INTAKE WALL *045 and 070 1-1/2” (38MM) EXHAUST EXHAUST *090 2”...
  • Page 30 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 31 (USA) Crawl Space and Extended Horizontal Venting KIT 15Z70 Lennox provides kit 51W18 (USA) and kit 15Z70 (Cana- (CANADA) da) to install 2” or 3” PVC exhaust piping through the floor joists and into the the crawl space. See Figure 44.
  • Page 32 Condensate Piping CONDENSATE TRAP AND PLUG LOCATIONS This unit is designed for either right- or left-side exit of (Unit shown in upflow position) condensate piping in upflow applications. In horizontal Trap applications, the condensate trap must extend below the (same on unit.
  • Page 33 (Unit shown in upflow position with remote trap) and line. Heating cable kit is available from Lennox in var- ious lengths; 6 ft. (1.8m) - kit no. 26K68; 24 ft. (7.3m) - kit FieldProvidedVent no.
  • Page 34 IMPORTANT Furnace with Evaporator Coil Using a Common Drain When combining the furnace and evaporator coil drains together, the A/C condensate drain outlet must Evaporator drain be vented to relieve pressure in order for the furnace line required pressure switch to operate properly. (Trap at coil is optional) Condensate Trap With Optional Overflow Switch (1”...
  • Page 35 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 36: Gas Piping

    6 - In some localities, codes may require installation of Gas Piping a manual main shut-off valve and union (furnished Gas supply piping should not allow more than 0.5”W.C. by installer) external to the unit. Union must be of drop in pressure between gas meter and unit. Supply gas the ground joint type.
  • Page 37 Upflow Application Upflow Application Left Side Piping Right Side Piping 1/2” NPT (Standard) (Alternate) 1/2” NPT MANUAL MAIN SHUT-OFF VALVE MANUAL MAIN SHUT-OFF VALVE GROUND GROUND JOINT JOINT UNION UNION DRIP LEG FIELD PROVIDED AND INSTALLED DRIP LEG NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET Figure 55 Horizontal Applications Possible Gas Piping Configurations...
  • Page 38 TABLE 9 Gas Pipe Capacity - ft3/hr (m3/hr) Nominal Internal Length of Pipe - feet (m) Iron Pipe Diameter Size Inches inches (3.048) (6.096) (9,144) (12,192) (15.240) (18.288) (21.336) (24.384) (27.432) (30,480) (mm) (mm) .622 (12.7) (17.799) (4.87) (3.34) (2.69) (2.29) (2.03) (1.84)

  • Page 39: Electrical

    The power supply wiring must meet Class I restrictions. Electrical Protected by either a fuse or circuit breaker, select circuit protection and wire size according to unit nameplate. WARNING CAUTION Electrostatic discharge can affect electronic components. Take care Failure to use properly sized wiring and circuit breaker during unit installation and service to may result in property damage.

  • Page 40: Field Wiring For Both Communicating And Non

    When there is a cooling demand, For optimal performance in non-communicating applica- the fan will run on the first stage and second stage cool- tions, Lennox recommends use of a ComfortSense 7000 ® ing speed set using the thermostat in the installer setup high quality electronic digital thermostat or any other with mode.
  • Page 41 Communicating and Non Communicating Wiring - Ignition Control 107045-XX Communicating Enabled Furnace and Non- Communicating Enabled Furnace and Communicating Outdoor Unit Communicating Enabled Outdoor Unit COMMUNICATING FURNACE COMMUNICATING FURNACE OPTIONAL DISCHARGE AIR SENSOR OPTIONAL DISCHARGE AIR SENSOR OPTIONAL OUTDOOR OPTIONAL COMMUNICATING AIR SENSOR OUTDOOR...
  • Page 42 Communicating Wiring - Ignition Control 107045-XX Optional Accessories for use with Communicating System NOTE: COMMUNICATING THERMOSTAT SENSES HUMIDITY 120V CONNECTIONS & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT REQUIRED. “HUM” CONTACT IS CLOSED ANYTIME OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HUMIDI−...
  • Page 43 LENNOX COMMUNICATING OUTDOOR UNIT INDOOR UNIT (1 OR 2 STAGE) FLOAT SWITCH LENNOX COMMUNICATING OUTDOOR UNIT LENNOX COMMUNICATING FURNACE EL296V, SL280V, SL280VN, SL297V, SLP99V cutting DS to R will not cause communication interuption or error code CUT* R−DS W914 Figure 60...
  • Page 44 DIP Switch Settings and Field Wiring Ignition Control 107045-XX DIP Switch Settings and On-Board Links DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 1 Heat / 1 Cool FURNACE OUTDOOR T'STAT TERM.
  • Page 45 DIP Switch Settings and Field Wiring Ignition Control 107045-XX DIP Switch Settings and On-Board Links DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 2 Heat / 2 Cool FURNACE OUTDOOR T'STAT TERM.

  • Page 46: Integrated Control

    DIP Switch Settings and Field Wiring Ignition Control 107045-XX DIP Switch Settings and On-Board Links DIP Switch 1 Thermostat On Board Links Must Be Cut To Select Wiring Connections Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7742U TERM.
  • Page 47 DIP Switch Settings and Field Wiring Ignition Control 107045-XX DIP Switch Settings and On-Board Links DIP Switch 1 Thermostat On Board Links Must Be Cut To Select Wiring Connections Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7742U TERM.
  • Page 48 EL297UHV With Ignition Control 107045-XX COMBUSTION AIR COMBUSTION AIR BLOWER MOTOR BLOWER MOTOR DOOR IGNITOR INTERLOCK CIRC FLAME SENSE WHT/PINK FLAME SENSOR 120V BLUE BLUE MV COM PINK PURPLE S102 HIGH HEAT PRESSURE SWITCH PURPLE S128 LOW HEAT PRESSURE SWITCH BLUE BRN W / YEL STRIPE...
  • Page 49 EL297UHV With Blower Drive and Ignition Control 107045-XX COMBUSTION AIR COMBUSTION AIR BLOWER MOTOR BLOWER MOTOR DOOR IGNITOR INTERLOCK CIRC FLAME SENSE WHT/PINK FLAME SENSOR 120V BLUE BLUE MV COM PINK PURPLE S102 HIGH HEAT PRESSURE SWITCH PURPLE S128 LOW HEAT PRESSURE SWITCH BLUE BRW W / YEL...
  • Page 50 EL297UHV-135 With Ignition Control 107045-XX COMBUSTION AIR COMBUSTION AIR BLOWER MOTOR BLOWER MOTOR DOOR IGNITOR INTERLOCK CIRC FLAME SENSE WHT/PINK FLAME SENSOR 120V BLUE BLUE MV COM PINK PURPLE S102 HIGH HEAT PRESSURE SWITCH PURPLE S128 LOW HEAT PRESSURE SWITCH BLUE BRW W / YEL RO(OUT)
  • Page 51 EL297UHV-135 With Blower Drive and Ignition Control 107045-XX COMBUSTION AIR COMBUSTION AIR BLOWER MOTOR BLOWER MOTOR DOOR IGNITOR INTERLOCK CIRC FLAME SENSE WHT/PINK FLAME SENSOR 120V BLUE BLUE MV COM PINK PURPLE S102 HIGH HEAT PRESSURE SWITCH PURPLE S128 LOW HEAT PRESSURE SWITCH BLUE BRW W / YEL...
  • Page 52 Ignition Control 107045-XX IGNITION CONTROL LINE 1 IGNITOR / CAI NEUTRAL FLAME SENSE TB82 TB84 RS-BUS LINK (TB82, future use) THERMOSTAT CONNECTIONS (TB1) DS = DEHUMIDIFICATION SIGNAL I+ = DATA HIGH CONNECTION W2 = HEAT DEMAND FROM 2ND STAGE T/STAT I - = DATA LOW CONNECTION R = 24VAC W1 = HEAT DEMAND FROM 1ST STAGE T/STAT...

  • Page 53: Conventional Thermostat (Non-Communicating)

    TABLE 11 Integrated Control Switch Settings Conventional Thermostat (non-communicating) Blower Off Delay Switch Settings EL297UHV units are equipped with a two-stage, variable Blower Off Delay Switch 3 Switch 4 speed integrated control. This control manages ignition Seconds timing, heating mode fan off delays and indoor blower speeds based on selections made using the control dip 90 (factory) switches and jumpers.
  • Page 54 NOTE - The off portion of the selected ramp profile also Ramping Option D applies during heat pump operation in dual fuel applica- • Motor runs at 100% until demand is satisfied. tions. • Once demand is met, motor ramps down to stop. TABLE 14 Cooling Mode Blower Speed Ramping Ramping...

  • Page 55: Blower 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 56 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 57 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 450 cfm. for EL297UH090XV60C and 380 cfm for EL297UH110XV48C ®...
  • Page 58 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 59: On-Board Links

    W914 (R to DS) on SureLight® control With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control Dave Lennox ComfortSense® 7000 thermostat to use for this application - Y2081 4 heat / 2 cool *Dehumidification blower speed is 70% of COOL speed for all units .
  • Page 60 With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control Dave Lennox ComfortSense® 7000 thermostat to use for this application - Y2081 4 heat / 2 cool *Normal operation first stage cooling blower speed is 70% COOL speed.

  • Page 61: Unit Start Up

    WARNING Unit Start Up FOR YOUR SAFETY READ BEFORE OPERATING If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal WARNING injury or death. Do not use this furnace if any part has been underwater. Gas Valve Operation (Figure 66) A flood-damaged furnace is extremely dangerous.

  • Page 62: Gas Pressure Adjustment

    1 - When thermostat calls for heat, combustion air NOTE - Pressure test adapter kit (10L34) is available from inducer starts. Lennox to facilitate manifold pressure measurement. 2 - Combustion air pressure switch proves blower A manifold pressure post located on the gas valve pro- operation.

  • Page 63: Proper Combustion

    Proper Cumbustion 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- tions over 4500 feet (1372 m) is the jurisdiction of local bustion.

  • Page 64: Combustion Air For Non-Direct Vent Applications

    If a EL297UHV furnace replaces a Category I furnace Repair Parts which was commonly vented with another gas appliance, The following repair parts are available through Lennox the size of the existing vent pipe for that gas appliance dealers. When ordering parts, include the complete fur- must be checked.

  • Page 65: Other Unit Adjustments

    Applications Using a Two-Stage Thermostat Other Unit Adjustments See Figure 67 for ignition control sequence NOTE - See troubleshooting flow charts if any safety A - Heating Sequence -- Integrated Control Thermostat switches are found to be open. Selection DIP Switch 1 OFF in “Two-Stage” Position Primary Limit.
  • Page 66 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) See Figure 68 for ignition control sequence and ignition occurs. At the same time, the control B - Heating Sequence -- Integrated Control Thermostat module sends a signal to begin an indoor blower Selection DIP Switch 1 ON in “Single-Stage”...

  • Page 67: Service

    14 - 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 Perform a general system test. Turn on the furnace to be checked as follows:...
  • Page 68 Winterizing and Condensate Trap Care 7 - Use the soft brush attachment on a vacuum cleaner to gently clean the face of the burners. Visually 1 - Turn off power to the furnace. inspect the inside of the burners and crossovers for 2 - Have a shallow pan ready to empty condensate any blockage caused by foreign matter.

  • Page 69: Program Unit Capacity/Size Mode

    Program Unit Capacity/Size Mode 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 70: Requirements For Commonwealth Of Massachusetts

    Requirements for Commonwealth of Massachusetts Modifications to NFPA-54, Chapter 10 4 - INSPECTION. The state or local gas inspector of the side wall, horizontally vented, gas-fueled Revise NFPA-54 section 10.8.3 to add the following equipment shall not approve the installation unless, requirements: upon inspection, the inspector observes carbon For all side wall, horizontally vented, gas-fueled equip-...
  • Page 71 ADDENDUM FOR ALL PROVINCES OF CANADA See below for venting in all provinces of Canada. Lennox approves the following termination for use in all provinces of Canada. 12” 2” (51MM) 3” (76MM) Vent Pipe Vent Pipe A − Clearance above grade or 12”...
  • Page 72 TABLE 23 Allowable Heating Speeds EL297UH -18% -12% Default +12% +18% +24% Model 045XV36B 070XV36B 090XV36C Allowed Allowed 090XV48C Factory Allowed Alloweed Allowed Allowed Allowed Setting 090XV60C 110XV48C Not Allowed Not Allowed 110XV60C Allowed Allowed 135XV60D Not Allowed Not Allowed TABLE 24 Allowable Circulation Speeds EL297UH Model Number...
  • Page 73 Start-Up & Performance Check List UNIT SET UP (typical) Furnace: Model Number_______________ Serial Number_________________ SUPPLY Line Voltage GAS SUPPLY LP Propane Gas Natural Gas Piping Connections Tight Leak Tested Flter Supply Line Pressure “W.C.________ RETURN AIR Gas Supply Pressure DUCT SYSTEM SUPPLY AIR DUCT Sealed INTAKE / EXHAUST PIPE...
  • Page 74 UNIT OPERATION HEATING MODE COOLING MODE GAS MANIFOLD PRESSURE “W.C._____ INDOOR BLOWER AMPS______ COMBUSTION SAMPLE CO CO PPM_______ TEMPERATURE DROP ______ Return Duct Temperature _________ INDOOR BLOWER AMPS______ Supply Duct Temperature _______ Temperature Drop = _________ TEMPERATURE RISE TOTAL EXTERNAL STATIC (dry coil) Supply Duct Temperature ________ Supply External Static _______ Return Duct Temperature...

This manual is also suitable for:

Elite el297uh045xv36bElite el297uhv seriesElite el297uh090xv36cElite el297uh090xv48cElite el297uh090xv60cElite el297uh110xv48c ... Show all

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