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Lennox International Inc. Elite Series Gas Furnace Furnace User Manual

1. Gas Supply Pressure 5 DUCT SYSTEM SUPPLY AIR DUCT L Sealed INTAKE EXHAUST PIPE L All Joints Primed and Glued Insulated if necessary RETURN DUCT L Terminations Installed Properly Sealed L Horizontal Pipes Sloped if applicable Filter Installed and Clean L Condensate Trap Primed Line Sloped L Grilles Unobstructed VOLTAGE CHECK _ Heat Cable Installed and Operable if applicable Supply Voltage 1 C Electrical Connections Tight O Pipes Supported Page 56 HEATING MODE UNIT OPERATION COOLING MODE GAS MANIFOLD PRESSURE W C INDOOR BLOWER AMPS COMBUSTION SAMPLE CO2 5 INDOOR BLOWER AMPS 2 TEMPERATURE RISE Supply Duct Temperature Return Duct Temperature Temperature Rise TOTAL EXTERNAL STATIC Supply External Static Return External Static Total External Static 9 CONDENSATE LINE Leak Free VENT PIPE Leak Free Combustion Thermostat ec COPPM 1 TEMPERATURE DROP Return Duct Temperature Supply Duct Temperature Temperature Drop 5 TOTAL EXTERNAL STATIC dry coil Supply External Static Return External Static Total External Static DRAIN LINE Leak Free 9 THERMOSTAT L Adjusted and Programmed Explained Operation to Owner
2. Temperatures Gas Manifold Pressure Blower Motor Amps Duct Static High 5 RETURN AIR Contractor s Name Job Address Telephone Checklist Completed Technician s Name Page 57 Requirements for Commonwealth of Massachusetts Modifications to NFPA 54 Chapter 10 Revise NFPA 54 section 10 8 3 to add the following re quirements For all side wall horizontally vented gas fueled equipment installed in every dwelling building or structure used in whole or in part for residential purposes including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven 7 feet above the finished grade in the area of the venting in cluding but not limited to decks and porches the following requirements shall be satisfied 1 INSTALLATION OF CARBON MONOXIDE DETEC TORS At the time of installation of the side wall hori zontally vented gas fueled equipment the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery backup is installed on the floor level where the gas equipment is to be installed In addition the installing plumber or gasfitter shall observe that a battery oper ated or hard wired ca
3. 0 ee 13 Pipe and Fittings Specifications 13 Joint Cementing Procedure 15 02 13 ONT Page 1 Venting 15 Gas PIPN 38 Electrical RR 40 Integrated Control 43 Unit Start Up Re 49 Gas Pressure Measurement 50 Proper Combustion 51 High Altitude 51 Other Unit Adjustments 53 Sequence of Operation 53 Repair Parts 54 Service ice iced me Eae ed aaa RE ERE EUER 55 Start Up and Performance Checklist 56 507067 01 EL296UHE Unit Dimensions inches mm 3 1 60C and 60D size units that require air volumes 1800 cfm or over 850 L s must have one of the following 1 Single side return air with transition to accommodate 20 x 25 x 1 in 508 x 635 x 25 mm cleanable air filter Required to maintain proper air velocity 2 Single side return air with optional Return Air Base 3 Bottom return air 4 Return air from both sides 5 Bottom andone side return air See Blower Performancetables for additional information Optional External Side Return Air Filter Kit is not for use with the optional Return Air Base i 9 1
4. 7 feet 2 1m T 12 inches 305mm t 12 inches 305mm t 1In accordance with the current ANSI Z223 1 NFPA 54 Natural Fuel Gas Code 2 n accordance with the current CSA B149 1 Natural Gas and Propane Installation Code For clearances not specified in ANSI Z223 1 NFPA 54 or CSA B149 1 clearance will be in accordance with local installation codes and the requirements of the gas supplier and these installation instructions T vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings t 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 27 Details of Intake and Exhaust Piping Terminations for Direct Vent Installations NOTE In Direct Vent installations combustion air is tak en from outdoors and flue gases are discharged to out doors NOTE Flue gas may be slightly acidic and may adversely affect some building materials If any vent termination is used and the flue gasses may impinge on the building ma terial a corrosion resistant shield minimum 24 inches square should be used to protect the wall surface If the optional tee is used the protective shield is recommended The shield should be constructed using wood plastic sheet metal or other suitable material All seams joints cracks etc in the affec
5. IAQ CABINET INDOOR AIR ASINGLE Maximum 129 76 QUALITY RETURN AIR 1 Unit side return air 44 856 570 CABINET PLENUM Opening SEH PCO Filter MUST i a GE etc COVER BOTH FUR TUM UNIT AND RETURN 5 5 3 SIDE RETURN AIR BASE 143 AIR OPENINGS OPENINGS Either Side 23 17 1 2 446 B Width CTS SEHEN 584 21 533 C Width 50W99 AIR BASE 26 7 8 24 1 2 622 D Width 51W00 683 FRONT VIEW SIDE VIEW NOTE Optional side return air filter kits are not for use with return air base 1 Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet Minimum unit side return air opening dimensions for units requiring 1800 cfm of air and over W x H 23 x 11 in 584 x 279 mm The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown Side return air openings must be cut in the field There are cutting guides stenciled on the cabinet for the side return air opening The size of the opening must not extend beyond the markings on the furnace cabinet To minimize pressure drop the largest opening height possible up to 14 inches is preferred FIGURE 14 Removing the Bottom Panel Removing the Bottom Panel Remove the two screws that secure the bottom cap to the furnace Pivot the bottom cap down to release the bottom panel Once the bottom panel has been removed reinstall the bottom cap See figu
6. 305mm Above attic floor Roof Terminated Exhaust Pipe Intake Debris Screen Provided Furnace See table 6 for maximum vent lengths NOTE The inlet and outlet air openings shall each have a free area of at least one square inch per 4 000 Btu 645mm per 1 17kW per hour of the total input rating of all equipment in the enclosure FIGURE 6 Page 7 EQUIPMENT IN CONFINED SPACE Inlet Air from Ventilated Crawlspace and Outlet Air to Outside Roof Terminated Exhaust Pipe Inlet Air Minimum 12 in 305mm Louvers Above crawl Crawl space space floor Coupling or 3 in to 2 in Intake Debris Screen Provided Transition Field Provided Ventilation See table 6 for maximum vent lengths NOTE The inlet and outlet air openings shall each have a free area of at least one square inch per 4 000 Btu 645mm per 1 17kW per hour of the total input rating of all equipment in the enclosure FIGURE 7 When ducts are used they shall be of the same cross sec tional area as the free area of the openings to which they connect The minimum dimension of rectangular air ducts shall be no less than 3 inches 75 mm In calculating free area the blocking effect of louvers grilles or screens must be considered If the design and free area of protec tive covering is not known for calculating the size opening required it may be assumed that wood louvers will have 20 to 25 percent free are
7. DO NOT turn ABS or cellular core pipe NOTE Assembly should be completed within 20 sec onds after last application of cement Hammer blows should not be used when inserting pipe O 1 N 1 Page 14 8 After assembly wipe excess cement from pipe at end of fitting socket A properly made joint will show a bead around its entire perimeter Any gaps may indi cate an improper assembly due to insufficient sol vent 9 Handle joints carefully until completely set Venting Practices Piping Suspension Guidelines SCHEDULE 40 PVC 5 all other pipe 3 See fable 2 for allowable pipe NOTE Isolate piping at the point where it exits the outside wall or roof in order to prevent transmission of vibration to the structure NOTE All horizontal runs of exhaust pipe must slope back to ward unit a minimum of 1 4 6mm drop for each 12 305mm Wall Thickness Guidelines 24 maximum 3 4 minimum Wall outside insulation if required FIGURE 20 1 In areas where piping penetrates joists or interior walls hole must be large enough to allow clearance on all sides of pipe through center of hole using a hanger 2 When furnace is installed in a residence where unit is shut down for an extended period of time such as a vacation home make provisions for draining conden sate collection trap and lines Removal of the Furnace from Common Vent In the event that an existing furnace is removed from a venting
8. 4 5 O 1 1 Page 52 horizontal pitch Determine there is no blockage or re striction leakage corrosion or other deficiencies which could cause an unsafe condition To the extent that it is practical close all building doors and windows and all doors between the space in which the appliances connected to the venting system are lo cated and other spaces of the building Close fireplace dampers Turn on clothes dryers and any appliances not con nected to the venting system Turn on any exhaust fans such as range hoods and bathroom exhausts so they will operate at maximum speed Do not operate a summer exhaust fan Follow the lighting instruction to place the appliance being inspected into operation Adjust thermostat so appliance will operate continuously Use the flame of match or candle to test for spillage of flue gases at the draft hood relief opening after 5 min utes of main burner operation If improper venting is observed during any of the above tests the venting system must be corrected or sufficient combustion make up air must be provided The venting system should be re sized to approach the minimum size as determined by using the ap propriate tables in appendix G in the current standards of the National Fuel Gas Code ANSI Z223 1 NPFA 54 in the U S A and the appropriate Natural Gas and Propane appliances venting sizing tables in the cur rent standard of the CSA B149 Natural Gas and Pro pane Install
9. 76 MM Dia Exhaust et EXHAUST 6 152 MM AIR 6 152 Minimum f 6 6 152 12 305 Minimum Jr 305 MM Minimum Minimum Above Grade or Average Above Grade or Average Snow Accumulation Snow Accumulation 77 GRADE 7 GRADE 12 305 MM Max for 2 51 MM Dia Exhaust wall support every 24 610 Use two supports if 20 508 MM Max for 3 76 MM Dia Exhaust extension is greater than 24 but less than 48 FIGURE 45 Page 32 EL296UHE DIRECT VENT APPLICATION USING EXISTING CHIMNEY STRAIGHT CUT OR ANGLE CUT IN DIRECTION OF ROOF SLOPE 4 1 H 1 3 8 76MM 203MM e 203 305MM EXHAUST VENT 1 2 13MM WEATHERPROOF INSULATION SHOULDER OF FITTINGS PROVIDE SUPPORT OF PIPE ON TOP PLATE ALTERNATE INTAKE PIPE Minimum 12 305MM above chimney top plate or average snow accumulation INTAKE PIPE INSULATION optional SHEET METAL TOP PLATE LA INSULATE TO FORM EXTERIOR PORTION OF CHIMNEY SIZE TERMINATION PIPE PER TABLE 8 NOTE Do not discharge exhaust gases directly into any chimney or vent stack If ver tical discharge through an existing unused chimney or stack is required insert piping inside chimney until the pipe open end is above top of chimney and terminate as illus trated In any exterior portion of chimney the exhaust vent must be insulated FIGURE 46 Details of Exhaust Pipi
10. Do not discharge exhaust gases directly into any chimney or vent stack If ver tical discharge through an existing unused chimney or stack is required insert piping inside chimney until the pipe open end is above top of chimney and terminate as illus trated In any exterior portion of chimney the exhaust vent must be insulated FIGURE 50 Condensate Piping This unit is designed for either right or left side exit of con densate piping in upflow applications In horizontal applica tions the condensate trap must extend below the unit An 8 service clearance is required for the condensate trap Refer to figures 51 and 53 for condensate trap locations Figure 59 shows trap assembly using 1 2 PVC or 3 4 PVC NOTE If necessary the condensate trap may be installed up to 5 away from the furnace Use PVC pipe to connect trap to furnace condensate outlet Piping from furnace must slope down a minimum of 1 4 per ft toward trap 1 Determine which side condensate piping will exit the unit location of trap field provided fittings and length of PVC pipe required to reach available drain 2 Use a large flat head screw driver or a 1 2 drive socket extension and remove plug figure 51 from the cold end header box at the appropriate location on the side of the unit Install provided 3 4 NPT street elbow fitting into cold end header box Use Teflon tape or appropri ate pipe dope 3 Install the cap over the clean out opening at the base
11. Electrostatic discharge can affect elec protection and wire size according to unit nameplate tronic components Take precautions to neutralize electrostatic charge by NOTE Unit nameplate states maximum current draw touching your hand and tools to metal Maximum Over Current Protection allowed is 15 prior to handling the control Holes are on both sides of the furnace cabinet to facilitate wiring Install a separate properly sized disconnect switch near the furnace so that power can be turned off for servicing Before connecting the thermostat check to make sure the wires will be long enough for servicing at a later date Make sure that thermostat wire is long enough to facilitate future removal of blower for service Complete the wiring connections to the equipment Use the provided unit wiring diagram and the field wiring diagram shown in figure 64 Use 18 gauge wire or larger that is suit able for Class II rating for thermostat connections Electrically ground the unit according to local codes or in the absence of local codes according to the current Na Right Side tional Electric Code ANSI NFPA No 70 for the USA and current Canadian Electric Code part 1 CSA standard C22 1 for Canada A green ground wire is provided in the field make up box NOTE The EL296UHE furnace contains electronic FIGURE 63 components that are polarity sensitive Make sure that the furnace is wired correctly and is properly grounded IN
12. Oe B5 7 M Natural 1000 btu cu ft LP 2500 btu cu ft Furnace should operate at least 5 minutes before check ing gas flow Determine time in seconds for two revolu tions of gas through the meter Two revolutions assures a more accurate time Divide by two and compare to time in table 15 If manifold pressure matches table 17 and rate is incorrect check gas orifices for proper size and re striction Remove temporary gas meter if installed NOTE To obtain accurate reading shut off all other gas appliances connected to meter Supply Pressure Measurement An inlet post located on the gas valve provides access to the supply pressure See figure 66 Back out the 3 32 hex Screw one turn connect a piece of 5 16 tubing and connect to a manometer to measure supply pressure See table 17 for supply line pressure On multiple unit installations each unit should be checked separately with and without units operating Supply pres sure must fall within range listed in table 17 Manifold Pressure Measurement NOTE Pressure test adapter kit 10L34 is available from Lennox to facilitate manifold pressure measurement A manifold pressure post located on the gas valve provides access to the manifold pressure See figure 66 Back out the 3 32 hex screw one turn connect a piece of 5 16 tubing and connect to a manometer to measure manifold pres sure To correctly measure manifold pressure the differ
13. TO OTHER EQUIPMENT AND ACCESSORIES S51 INTEGRATED CONTROL 24 V GND bu 5 2 2 amp e o HIGH COOL WHT PINK SENSE S102 HIGH HEAT PRESSURE SWITCH 128 LOW HEAT PRESSURE SWITCH COMBUSTION AIR BLOWER MOTOR WHTIBLK Z c 4 92 INTEGRATED CONTROL WARNING GROUND ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE LINE VOLTAGE FIELD INSTALLED WITH NATIONAL AND LOCAL CODES CLASS II VOLTAGE FIELD WIRING NOTE IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT 78 DENOTES OPTIONAL COMPONENTS MUST BE REPLACED WITH WIRE OF LIKE SIZE RATING INSULATION THICKNESS AND TERMINATION FIGURE 64 Page 42 Integrated Control 24VAC Indoor Blower Terminals Ignitor and Combustion Air Inducer Neutrals Flame Sense LED S4 DIP Switches Diagnostic Push On Board Links 3 16 QUICK CONNECT TERMINALS THERMOSTAT CONNECTIONS TB1 FLAME SENSE SIGNAL DS DEHUMIDIFICATION SIGNAL HI COOL 24VAC W2 HEAT DEMAND FROM 2ND STAGE T STAT W1 HEAT DEMAND FROM 1ST STAGE T STAT SE CLASS 2 VOLTAGE TO THERMOSTAT LO COOL 24VAC MANUAL FAN FROM T STAT LO HEAT 24VAC C THERMOSTAT SIGNAL GROUND CONNECTED TO PARK TRANSFORMER GRD TR amp CHASIS GROUND GRD PARK COMMON 24VAC Y1 THERMOSTAT 1ST STAGE COOL SIGNAL Y2 THERMOSTAT 2ND STAGE COOL SIGNAL 1 4 QUICK CONNECT TERMINALS NEUTRALS 120 VAC NEUTRAL O THERMOSTAT SIGN
14. WALL TERMINATION KIT FIGURE 48 If exhaust piping must be run up a side wall to position above snow accumulation or other obstructions pip ing must be supported every 24 inches 610MM as shown in figure 49 When exhaust piping must be run up an outside wall any reduction in exhaust pipe size must be done after the final elbow 12 305MM MAX for 2 51MM 20 508MM MAX C 76MM 7222242 2 022222221727 M RN NI SIZE TER MINATION PIPE PER TABLE 8 UNCONDITIONED SPACE 6 152MM WALL SUPPORT FIELD PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION 12 305MM ABOVE GRADE OR AVERAGE SNOW ACCUMULATION 1 2 13MM FOAM INSULATION IN UNCONDITIONED SPACE 1 2 13MM FOAM INSULATION NON DIRECT VENT FIELD SUPPLIED WALL TERMINATION EXTENDED OR 15F74 WALL TERMINATION VENT PIPE EXTENDED Use wall support every 24 610 Use two supports if extension is greater than 24 but less than 48 FIGURE 49 EL296UHE NON DIRECT VENT APPLICATION USING EXISTING CHIMNEY SIZE TERMINATION PIPE PER TABLE 8 STRAIGHT CUT OR ANGLE CUT IN DIRECTION OF ROOF SLOPE EXHAUST VENT 1 1 2 13MM M WEATHERPROOF Minimum 12 305MM INSULATION above chimney top plate or average snow accumulation HOULDER OF FITTINGS PROVIDE SUPPORT OF PIPE ON TOP PLATE SHEET METAL TOP PLATE INSULATE TO FORM EXTERIOR SEAL PORTION OF CHIMNEY NOTE
15. adjustable period 7 or 12 min utes 1 On a call for heat thermostat first stage contacts close sending a signal to the integrated control The inte grated control runs a self diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts The combustion air inducer is ener gized at low speed 2 Once the control receives a signal that the low pres sure switch has closed the combustion air inducer be gins a 15 second pre purge in low speed NOTE If the low fire pressure switch does not close the combustion air inducer will switch to high fire After a 15 second pre purge the high fire pressure switch will close and the unit will begin operation on high fire After 10 to 20 seconds of high fire operation the unit will switch to low fire After the pre purge is complete a 20 second initial ig nitor warm up period begins The combustion air in ducer continues to operate at low speed 4 After the 20 second warm up period has ended the gas valve is energized on low fire first stage and ignition oc curs At the same time the control module sends a sig nal to begin an indoor blower 30 second ON delay When the delay ends the indoor blower motor is ener gized on the low fire heating speed and the HUM con tacts are energized The integrated control also initi ates a second stage on delay factory set at 7 minutes adjustable to 12
16. be free flowing and contain no lumps undissolved particles or any foreign matter that ad versely affects the joint strength or chemical resistance of the cement The cement shall show no gelation stratifica tion or separation that cannot be removed by stirring Re fer to the table 2 below for approved piping and fitting ma terials A CAUTION Solvent cements for plastic pipe are flammable liq uids and should be kept away from all sources of ignition Do not use excessive amounts of solvent cement when making joints Good ventilation should be maintained to reduce fire hazard and to minimize breathing of solvent vapors Avoid contact of ce ment with skin and eyes TABLE 2 PIPING AND FITTINGS SPECIFICATIONS Schedule 40 PVC Pipe Schedule 40 PVC Cellular Core Pipe Schedule 40 PVC Fittings Schedule 40 CPVC Pipe Schedule 40 CPVC Fittings SDR 21 PVC or SDR 26 PVC Pipe SDR 21 CPVC or SDR 26 CPVC Pipe Schedule 40 ABS Cellular Core DWV Pipe Schedule 40 ABS Pipe Schedule 40 ABS Fittings ABS DWV Drain Waste amp Vent D2661 Pipe amp Fittings D2665 PVC DWV Drain Waste amp Vent Pipe amp Fittings ASTM SPECIFICATION D2564 D2235 F493 D3138 ULCS636 A IMPORTANT EL296UHE exhaust and intake connections are PRIMER amp SOLVENT CEMENT PVC amp CPVC Primer PVC Solvent Cement CPVC Solvent Cement ABS Solvent Cement PVC CPVC ABS All Purpose Cement For Fittings amp Pipe of the sa
17. below for each appliance connected to the venting system being placed into operation could result in carbon monox ide poisoning or death The following steps shall be followed for each ap pliance connected to the venting system being placed into operation while all other appliances con nected to the venting system are not in operation After the EL296UHE gas furnace has been started the fol lowing test should be conducted to ensure proper venting and sufficient combustion air has been provided to the EL296UHE as well as to other gas fired appliances which are separately vented If a EL296UHE furnace replaces a Category furnace which was commonly vented with another gas appliance the size of the existing vent pipe for that gas appliance must be checked Without the heat of the original furnace flue products the existing vent pipe is probably oversized for the single water heater or other appliance The vent should be checked for proper draw with the remaining appliance The test should be conducted while all appliances both in operation and those not in operation are connected to the venting system being tested If the venting system has been installed improperly or if provisions have not been made for sufficient amounts of combustion air corrections must be made as outlined in the previous section 1 Seal any unused openings in the venting system 2 Visually inspect the venting system for proper size and 1
18. floor do not install the furnace directly on carpeting tile or other combustible materials other than wood flooring FIGURE 12 Return Air Guidelines Return air can be brought in through the bottom or either side of the furnace installed in an upflow application If the furnace is installed on a platform with bottom return make an airtight seal between the bottom of the furnace and the platform to ensure that the furnace operates properly and safely The furnace is equipped with a removable bottom panel to facilitate installation Markings are provided on both sides of the furnace cabinet for installations that require side return air Cut the furnace cabinet at the maximum dimensions shown on page 2 Refer to Product Specifications for additional information EL296UHE applications which include side return air and a condensate trap installed on the same side of the cabinet trap can be installed remotely within 5 ft re quire either a return air base or field fabricated transi tion to accommodate an optional IAQ accessory taller than 14 5 See figure 13 Side Return Air with transition and filter D 20 X 25 X 1 508mmX635mmX 25mm 1 1 2 Air Filter Return Air Plenum Transition FIGURE 13 Page 10 Optional Return Air Base Upflow Applications Only pis O IF BASE 1 23 584 IS USED Overall WITHOUT Maximum 1 Minimum 11 279
19. flue pipe as shown in the illustration Do not use an accelerator in applications that include an exhaust termination tee The accelerator is not required 2 As required Flue gas may be acidic and may adversely affect some building materials If a side wall vent termination is used and flue gases will impinge on the building materials a corrosion resistant shield 24 inches square should be used to protect the wall surface If optional tee is used the protective shield is recommende d The shield should be constructed using wood sheet metal or other suitable material All seams joints cracks etc in affected area should be sealed using an appropriate sealant 3Exhaust pipe 45 elbow can be rotated to the side away from the combustion air inlet to direct exhaust away from adjacent property The exhaust must never be directed toward the combustion air inlet FIGURE 35 Page 29 FIELD FABRICATED WALL TERMINATION OR 15F74 WALL RING TERMINATION KIT NOTE FIELD PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION 1 2 13MM ARMAFLEX INSULATION IN UN CONDITIONED SPACE SIZE TERMINATION PER TABLE 8 STRAIGHT APPPLICATION 1 2 13MM ARMAFLEX INSULATION IN UNCONDITIONED SPACE WALL SUPPORT EXTENDED APPLICATION See venting table 5 for maximum venting lengths with this arrangement Use wall support every 24 610MM Use two wall supports if extension is greater than 24 610MM bu
20. in an unconditioned space consider provisions required to prevent freezing of condensate drain system e The A coil drain pan is high quality engineering poly mer with a maximum service temperature of 500 F However adequate space must be provided between the drain pan and the furnace heat exchanger At least 2 space is required for sectionalized heat exchanger and and 4 for drum type or oil fired furnace exchanger Closer spacing may damage the drain pan and cause leaking A CAUTION EL296UHE unit should not be installed in areas nor mally subject to freezing temperatures Page 5 AWARNING The State of California has determined that this prod uct may contain or produce a chemical or chemicals in very low doses which may cause serious illness or death It may also cause cancer birth defects or reproductive harm A WARNING Insufficient combustion air can cause headaches nausea dizziness or asphyxiation It will also cause excess water in the heat exchanger resulting in rust ing premature heat exchanger failure Excessive exposure to contaminated combustion air will result in safety and performance related problems Avoid exposure to the following substances in the com bustion air supply Permanent wave solutions Chlorinated waxes and cleaners Chlorine base swimming pool chemicals Water softening chemicals De icing salts or chemicals Carbon tetrachloride Halogen type refrigerants Cleaning so
21. leak around the base of the unit at the platform or at the return air duct connection can cause a potentially dangerous negative pressure condition Air for combustion and ventilation can be brought into the confined space ei ther from inside the building or from outside Air from Inside If the confined space that houses the furnace adjoins a space categorized as unconfined air can be brought in by providing two permanent openings between the two spaces Each opening must have a minimum free area of 1 square inch 645 mm per 1 000 Btu 29 kW per hour of total input rating of all gas fired equipment in the confined space Each opening must be at least 100 square inches 64516 mm One opening shall be within 12 inches 305 mm of the top of the enclosure and one opening within 12 inches 305 mm of the bottom See figure 4 EQUIPMENT IN CONFINED SPACE ALL AIR FROM INSIDE ROOF TERMINATED EXHAUST PIPE LLL DE OPENINGS To Adjacent SIDE WALL Unconfined TERMINATED Space EXHAUST PIPE x r4 ALTERNATE LOCATION NOTE Each opening shall have a free area of at least one square inch per 1 000 Btu 645mm per 29kW per hour of the total input rating of all equipment in the enclosure but not less than 100 square inches 64516mm 2 FIGURE 4 Page 6 Air from 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
22. of the trap Secure with clamp See figure 59 4 Install drain trap using appropriate PVC fittings glue all joints Glue the provided drain trap as shown in fig ure 59 Route the condensate line to an open drain Condensate line must maintain a 1 4 downward slope from the furnace to the drain CONDENSATE TRAP AND PLUG LOCATIONS Unit shown in upflow position Trap same on right side 1 1 2 in e al Plug 4 same on left side NOTE In upflow applications where side return air filter is installed on same side as the conden sate trap filter rack must be installed beyond condensate trap or trap must be re located to avoid interference FIGURE 51 5 Figures 54 and 56 show the furnace and evaporator coil using a separate drain If necessary the conden sate line from the furnace and evaporator coil can drain together See figures 55 57 and 58 Upflow furnace figure 57 In upflow furnace applica tions the field provided vent must be a minimum 1 to a maximum 2 length above the condensate drain outlet connection Any length above 2 may result in a flooded heat exchanger if the combined primary drain line were to become restricted Horizontal furnace figure 58 In horizontal furnace applications the field provided vent must be a mini mum 4 to a maximum 5 length above the condensate drain outlet connection Any length above 5 may re sult in a flooded
23. print size no less than one half 1 2 inch in size GAS VENT DIRECT LY BELOW KEEP CLEAR OF ALL OBSTRUC TIONS 1 4 INSPECTION The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation unless upon inspec tion the inspector observes carbon monoxide detec tors and signage installed in accordance with the pro visions of 248 CMR 5 08 2 a 1 through 4 EXEMPTIONS The following equipment is exempt from 24 CMR 5 08 2 a 1 through 4 1 The equipment listed in Chapter 10 entitled Equip ment Not Required to Be Vented in the most current edition of NFPA 54 as adopted by the Board and 2 Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure sepa rate from the dwelling building or structure used in whole or in part for residential purposes MANUFACTURER REQUIREMENTS GAS EQUIPMENT VENTING SYSTEM PROVIDED When the manufacturer of Product Approved side wall horizontally vented gas fueled equipment provides a vent ing system design or venting system components with the equipment the instructions provided by the manufacturer for installation of the equipment and the venting system shall include 1 Detailed instructions for the installation of the venting System design or the venting system components and 2 A complete parts list for the venting system design or venting system MANUFACT
24. system commonly run with separate gas ap pliances the venting system is likely to be too large to properly vent the remaining attached appliances Conduct the following test while each appliance is operat ing and the other appliances which are not operating re main connected to the common venting system If the venting system has been installed improperly you must correct the system as indicated in the general venting re quirements section WARNING CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon mon oxide poisoning or death The following steps shall be followed for each ap pliance connected to the venting system being placed into operation while all other appliances connected to the venting system are not in operation 1 Seal any unused openings in the common venting sys tem 2 Inspect the venting system for proper size and horizontal pitch Determine that there is no blockage restriction leakage corrosion or other deficiencies which could cause an unsafe condition Close all building doors and windows and all doors be tween the space in which the appliances remaining connected to the common venting system are located and other spaces of the building Turn on clothes dry ers and any appliances not connected to the common venting system Turn on any exhaust fans such
25. the original furnace flue products the existing vent pipe is probably oversized for the single water heater or other appliance The vent should be checked for proper draw with the remaining appliance FIGURE 21 Exhaust Piping Figures 22 24 and 25 Route piping to outside of structure Continue with installa tion following instructions given in piping termination sec tion A CAUTION Do not discharge exhaust into an existing stack or stack that also serves another gas appliance If verti cal discharge through an existing unused stack is re quired insert PVC pipe inside the stack until the end is even with the top or outlet end of the metal stack A CAUTION The exhaust vent pipe operates under positive pres sure and must be completely sealed to prevent leak age of combustion products into the living space Vent Piping Guidelines The EL296UHE 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 or ventilated attic or crawlspace and flue gases are discharged outdoors In Direct Vent installations combustion air is taken from outdoors and flue gases are discharged outdoors Intake and exhaust pipe sizing Size pipe according to tables 3 and 5 Count all elbows inside and outside the home Table 3 lists the minimum vent pipe lengths per mitted Table 5 lists the maximum pipe lengths permitted Regardl
26. 120VAC 1096 3 Check amp draw on the blower motor with blower ac cess panel in place Unit Nameplate Exhaust and Air Intake Pipe 1 Check exhaust and air intake connections for tightness and to make sure there is no blockage 2 15 pressure switch closed Obstructed exhaust pipe will cause unit to shut off at pressure switch Check ter mination for blockages 3 Obstructed pipe or termination may cause rollout Switches to open Reset manual flame rollout switches on burner box assembly if necessary Heating Sequence of Operation Electronic Ignition The two stage variable speed integrated control used in EL296UHE units has an added feature of an internal Watch guard control The feature serves as an automatic reset de vice for ignition control lockout caused by ignition failure Af ter one hour of continuous thermostat demand for heat the Watchguard will break and remake thermostat demand to the furnace and automatically reset the control to begin the ignition sequence Actual Page 53 NOTE The ignition control thermostat selection DIP switch is factory set in the TWO STAGE position Applications Using a Two Stage Thermostat A Heating Sequence Integrated Control Thermostat Selection DIP Switch 1 OFF in Two Stage Position Factory Setting 1 On a call for heat thermostat first stage contacts close sending a signal to the integrated control The inte grated control runs a self diagnostic pr
27. 6 14 OPTIONAL SIDE RETURN AIR FILTER KIT Either Side 838 AIR FLOW L 3 4 c 19 1 Bottom Return 5 8 3 4 16 19 i EXHAUST AIR OUTLET SUPPLY AIR OPENING COMBUSTION AIR INTAKE 2 T AT SIDE RETURN E AIR FILTER KIT Either Side 635 TOP VIEW 1 1 2 38 27 3 4 Front Panel 705 19 7 16 494 6 9 16 167 Left 9 229 2 51 Either Side GAS PIPING INLET Either Side 12 5 8 321 Either Side CONDENSATE a __ TRAP CONNECTION Either Side 6 1 2 165 Either Side Either Side 1 1 2 23 8 584 Side Return 14 Air Opening Either Side 23 1 2 597 Bottom Return Air Opening Air Opening FRONT VIEW SIDE VIEW Model No mm EL296UH045XE36B EL296UH070XE36B 194 533 505 19 1 2 495 238 EL296UH110XE60C 7 Page 2 EL296UHE Gas Furnace The EL296UHE Category IV gas furnace is shipped ready for installation in the upflow or horizontal position The fur nace is shipped with the bottom panel in place The bot tom panel must be removed if the unit is to be installed in horizontal or upflow applications with bottom return air The EL296UHE can be installed as either a Direct Vent or a Non Direct Vent gas central furnace The furnace is equipped for installation in natural gas ap plicatio
28. AL TO HEAT PUMP HUM UNPOWERED NORMALLY OPEN DRY CONTACTS REVERSING VALVE LI 120 VAC INPUT TO CONTROL DH NOT USED ACC 120 VAC OUTPUT TO OPTIONAL ACCESSORY L NOT USED FIGURE 65 Page 43 Integrated Control DIP Switch Settings EL296UHE units are equipped with a two stage integrated control This control manages ignition timing heating mode fan off delays and indoor blower speeds based on selections made using the control dip switches and jump ers The control includes an internal watchguard feature which automatically resets the ignition control when it has been locked out After one hour of continuous thermostat demand for heat the watchguard will break and remake thermostat demand to the furnace and automatically reset the control to relight the furnace Heating Operation DIP Switch Settings Switch 1 Thermostat Selection This unit may be used with either a single stage or two stage thermostat The thermostat selection is made using a DIP switch which must be properly positioned for the particular application The DIP switch is factory positioned for use with a two stage thermostat If a single stage thermostat is to be used the DIP switch must be repositioned a Select OFF for two stage heating operation con trolled by a two stage heating thermostat factory set ting b Select ON for two stage heating operation con trolled by a single stage heating thermostat This set ting provides a timed delay be
29. Fundamentals Handbook NOTE Maximum uninsulated vent lengths listed may include the termination vent pipe exterior to the structure and cannot exceed 5 linear feet or the maximum allowable intake or exhaust vent length listed in table 5 or 6 which ever is less RSC ESCH EH SCH Page 25 VENT TERMINATION CLEARANCES FOR NON DIRECT VENT INSTALLATIONS IN THE US AND CANADA INSIDE CORNER DETAIL AREA WHERE TERMINAL N N IS NOT PERMITTED Q AIR SUPPLY INLET VENT TERMINAL US Installations Canadian Installations 12 inches 305mm or 12 in 305mm 12 inches 305mm or 12 in 305mm above average snow accumulation Clearance above grade veranda above average snow accumulation porch deck or balcony 6 inches 152mm for appliances lt 10 000 Btuh 3kw 12 inches 305mm for appliances gt 10 000 Btuh 3kw and lt 100 000 Btuh 30kw 36 inches 9m for appliances gt 100 000 Btuh 30kw 12 Clearance to window or door that may be opened 4 feet 1 2 m below or to side of opening 1 foot 30cm above opening Clearance to permanently closed window 42 Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 feet 610 mm from the center line of the terminal Clearance to unventilated soffit Equal to or greater than soffit depth Equal to or greater than soffit depth Equal to or greater than soffit depth Equal to or greater than s
30. ION DRIP LEG Gas Valve DRIP LEG FIELD PROVIDED AND INSTALLED NOTE BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET FIGURE 61 Horizontal Applications Possible Gas Piping Configurations MANUAL MAIN SHUT OFF MANUAL Horizontal Application MAIN SHUT OFF Left Side Air Discharge VALVE GROUND JOINT UNION GROUND JOINT DRIP LEG 3 UNION DRIP LEG Gas Valve Horizontal Application Right Side Air Discharge 7 MANUAL MAIN SHUT OFF VALVE Gas Valve GROUND JOINT FIELD UNION PROVIDED AND INSTALLED NOTE BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET DRIFSLEG FIGURE 62 Page 39 TABLE 10 GAS PIPE CAPACITY FT HR kL HR Length of Pipe feet m tete t tote ts te 18 288 21 336 24 384 27 432 30 480 1 2 622 172 118 9 8 72 65 60 56 52 50 5 3 3 3 11 2 94 52 Nominal Iron Pipe Internal 17 799 3 34 29 03 84 3 4 824 360 247 199 170 151 137 126 117 110 104 19 05 20 930 10 19 7 00 5 63 4 81 4 28 3 87 8 56 3 31 3 11 2 94 1 1 049 678 466 374 320 284 257 237 220 207 195 25 4 26 645 19 19 13 19 10 59 9 06 804 727 6 71 623 5 86 5 52 1 1 4 1 380 1350 957 768 657 583 528 486 452 424 400 31 75 85 052 38 22 27 09 22 25 18 60 16 50 14 95 13 76 12 79 12 00 11 33 894 502 Zu Dia
31. LENGTHS EL296UHE MIN VENT LENGTH MODEL 15 ft or 5 ft plus 2 elbows or 10 ft plus 1 elbow 045 070 090 110 135 Any approved termination may be added to the minimum length listed Page 16 Use the following steps to correctly size vent pipe diameter Piping Size Process What is the furnace capacity 0 045 070 090 110 or 135 hich style termination 2 being used Standard or concentric See table 4 Which needs 3 most elbows Intake or exhaust How many elbows Count all elbows inside and outside house Desired pipe size 2 2 1 2 3 What is the altitude of the furnace installation Use table 5 or 6 to find max intake or exhaust pip length Includes all vent pipe and elbows inside and outside the house FIGURE 23 Page 17 A IMPORTANT Do not use screens or perforated metal in exhaust or intake terminations Doing so will cause freeze ups and may block the terminations TABLE 4 OUTDOOR TERMINATION USAGE STANDARD CONCENTRIC Wall Kit Wall Ring Kit Input Size Pipe Field C 51W11 US 22G44 US 44J40 US Fabricated US 60L46 US 51W12 430G28 CA 481420 CA 444W93 CA pw es Pe pets p po ppl pw e es Pe ME NEM YES YES YES NOTE Standard Terminations do not include any vent pipe or elbows external to the structure Any vent pipe or el
32. LENNOX 2013 Lennox Industries Inc Dallas Texas USA 9 E HORIZONTAL LEFT UPFLOW zw o HORIZONTAL RIGHT INSTALLATION INSTRUCTIONS EL296UHE ELITE SERIES GAS FURNACE UPFLOW HORIZONTAL AIR DISCHARGE 507067 01 Technical 02 2013 Publications Supersedes 01 2012 Litho U S A 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 manuals be alert to the potential for personal injury or death AWARNING 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 installer or equivalent service agency or the gas supplier A 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 2 EL296UHE Gas Furnace 3 Shipping and Packing Uei 3 Safety Information 3 Use of Furnace as a Construction Heater 4 General x2 EES ase Weis ege ERR 5 Combustion Dilution Ventilation Air 5 Setting 8 tee Ae 13 Duct System
33. MM inlet of intake D Maximum exhaust pipe length 12 305MM 20 508MM E Maximum wall support distance from top of each 6 152MM pipe intake exhaust B Maximum horizontal separation between intake and exhaust C Minimum from FIGURE 37 Page 30 2 EXTENSION FOR 2 PVC PIPE1 EXTENSION FOR 3 PVC PIPE COSS FURNACE EXHAUST PIPE FURNACE INTAKE GLUE EXHAUST END FLUSH INTO TERMINATION 1 1 2 ACCELERATOR all 45 070 and 090 units FLUSH MOUNT SIDE WALL TERMINATION 51W11 US or 51W12 Canada FIGURE 38 1 1 2 38mm accelerator provided on 71M80 amp 44W92 EXHAUST kits for EL296UHO45E36B A VENT 070E36B FLASHING 12 305mm Not Furnished Minimum Above Average Snow Accumulation SHEET METAL STRAP Clamp and sheet metal strap must be field installed to support the weight of the termination kit FIELD PROVIDED TT REDUCER MAY BE REQUIRED bJ TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION DIRECT VENT CONCENTRIC ROOFTOP TERMINATION 71M80 69M29 or 60L46 US 44W92 or 44W93 Canada FIGURE 39 FIELD PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION 1 1 2 38mm accelerator provided on 71M80 amp 44W92 kits for EL296UH045E36B amp 070E36B OUTSIDE INTAKE WALL AIR EXHAUST 2 EXHAUST 12 305mm Min above grade or average snow accumulation GRADE DIRECT VENT CONCENTRIC WALL TERMINATION 71M80 69M29 or 601 46
34. NACE TERM STRIP OUTDOOR UNIT CUT ON BOARD LINK W915 2 STAGE COMPR CUT ON BOARD LINK W914 DEHUM Not required on all units Page 45 TABLE 14 EL296 Field Wiring Applications With Conventional Thermostat Continued DIP Switch Settings and On Board Links See figure 65 DIP Switch 1 Thermostat Thermostat On Boara pins ings E Ur Taceo Wiring Connections Heating y Stages 2 Heat 2 Cool S1 FURNACE OUTDOOR T STAT TERM STRIP UNIT CUT ON BOARD LINK W915 CUT FOR 69 OPTION 2 STAGE 3 COMPR e aur CR S STAGE 9 8 9 9 2 Heat 2 Cool FURNACE OUTDOOR with t stat with CUT ONBOARD LINK TERM STRIP UNIT humidity control ter Low WI SE o letiim CUT ON BOARD LINK W914 DEHUM 2 Heat 1 Cool FURNACE OUTDOOR with t stat with i TERM STRIP UNIT humidity control CUT ON BOARD LINK W914 2 Heat 1 Cool FURNACE OUTDOOR TERM STRIP UNIT DO NOT CUT ANY ON BOARD LINKS Not required on all units Page 46 TABLE 14 EL296 Field Wiring Applications With Conventional Thermostat Continued DIP Switch 1 Thermostat Thermostat On Board Links Must Be Cut To Select Wiring Connections Heating System Options Stages Dual Fuel 77540 SNE HEAT PUMP Single Stage Heat Pump CUT ON BOARD LINK ComfortSense 7000 L7724U thermostat w dual fuel capa bilities Capable of 2 stage gas heat co
35. ON TRANSITION 2 xo DO NOT transition from smaller to larger pipe in horizontal runs of exhaust pipe When transitioning up in pipe size use the shortest length of 2 PVC pipe possible FIGURE 24 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON DIRECT VENT APPLICATIONS RIGHT HAND DISCHARGE SHOWN 12 max EXHAUST ER Q SIDE VIEW TRANSITION DO NOT transition from smaller to larger pipe in horizontal runs of exhaust pipe INTAKE When transitioning up in
36. OR ge GAS DF110XE60C BLUE YELLOW L 1 I 1I 1l 1 Mi 8102 BLOWER SPEED SELECTION HIGH HEAT BURNERS D ea SPEED TAPS BLACK T BROWN BLUE SWITCH ani i 5128 HUMIDIFIER 90 FLAME LOW HEAT TORORH ON CS7000 ROLLOUT SENSOR PRESSURE HUM SWITCH SWITCH AT IRC JACKPLUG CHART EE SE tm Zen SE E ROOM THERMOSTAT SEVEN ae NEUTRALS LN CUT W914 JUMPER LABELED DEHUM FROM DS ST JACK BLUCEIGNITION SEGMENT INTEGRATED AT A92 CONTROL BOARD WHEN USED 1234567 LED CONTROL WITH ComfortSense DIP SWITCH FACTORY DEFAULT IS FOR A TWO o 7000 THERMOSTAT STAGE THERMOSTAT DIAGNOSTIC A CUT W951 JUMPER FROM O TO R LABELED FIELD SUPPLIED ACC WIRE m HEAT PUMP AT A92 CONTROL BOARD WHEN A USED FOR DUAL FUEL APPLICATIONS USE COPPER CONDUCTORS ONLY CUT W915 JUMPER LABELED 2 STAGE COMPR AA DH AND L TERMINALS NOT USED FROM Y1 TO Y2 AT A92 CONTROL WHEN USED WITH A 2 STAGE COOL THERMOSTAT 47 H FLAME IGNITOR R33 547 DO NOT USE RED LOW SPEED FOR HIGH L13 USED ON 3 4 AND 1 HP ONLY HEAT ON ALL MODELS OUTDOOR p THERMOSTAT HEAT ANTICIPATION SETTING UNT SE HEAT COOL NOTE SEE INSTALLATION INSTRUCTIONS FOR PROCEDURE TO SET CORRECT BLOWER SPEED FOR SPECIFIC COOLING TONNAGE BEING APPLIED AND HEATING TEMPERATURE TERMINAL BOARD RISE REQUIRED TYPICAL SYSTEM SHOWN FOR 2 HEAT 2 COOL WITH A CONVENTIONAL THERMOSTAT SEE INSTALLATION INSTRUCTIONS FOR CONNECTIONS
37. Return Air Plenum NOTE Return air must not be drawn from a room where this furnace or any other gas fueled appliance i e water heater or carbon monoxide producing de vice i e wood fireplace is installed When return air is drawn from a room a negative pres sure is created in the room If a gas appliance is operating in a room with negative pressure the flue products can be pulled back down the vent pipe and into the room This reverse flow of the flue gas may result in incomplete com bustion and the formation of carbon monoxide gas This raw gas or toxic fumes might then be distributed through out the house by the furnace duct system Return air can be brought in through the bottom or either side of the furnace return air brought into either side of fur nace allowed only in upflow applications If a furnace with bottom return air is installed on a platform make an airtight seal between the bottom of the furnace and the platform to ensure that the unit operates properly and safely Use fiber glass sealing strips caulking or equivalent sealing method between the plenum and the furnace cabinet to ensure a tight seal If a filter is installed size the return air duct to fit the filter frame Pipe amp Fittings Specifications All pipe fittings primer and solvent cement must conform with American National Standard Institute and the Ameri can Society for Testing and Materials ANSI ASTM stan dards The solvent shall
38. S Horizontal Right Hand Air Discharge Application Shown PVC pipe coupling INTAKE DEBRIS SCREEN Provided NOTE Debris screen may be positioned straight out preferred or with an elbow rotated to face down FIGURE 27 Follow the next two steps when installing the unit in Non Direct Vent applications where combustion air is taken from indoors or ventilated attic or crawlspace and flue gases are discharged outdoors 1 Use field provided materials and the factory provided air intake screen to route the intake piping as shown in figure 26 or 27 Maintain a minimum clearance of 3 76mm around the air intake opening The air intake opening with the protective screen should always be directed forward or to either side in the upflow position and either straight out or downward in the horizontal position The air intake piping must not terminate too close to the flooring or a platform Ensure that the intake air inlet will not be obstructed by loose insulation or other items that may clog the debris screen 2 If intake air is drawn from a ventilated attic figure 28 or ventilated crawlspace figure 29 the exhaust vent length must not exceed those listed in table 6 If 3
39. TERIOR MAKE UP BOX INSTALLATION remove and relocate plug to unused opening on left side MAKE UP Page 40 Accessory Terminals One line voltage ACC 1 4 spade terminal is provided on the furnace integrated control See figure 65 for integrated control configuration This terminal is energized when the indoor blower is operating Any accessory rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to one of the provided neutral terminals If an accessory rated at greater than one amp is connected to this terminal it is necessary to use an exter nal relay An unpowered normally open dry set of contacts with a 1 4 spade terminal are provided for humidifier con nections and may be connected to 24V or 120V Any hu midifier rated up to one amp can be connected to these ter minals In 120V humidifier applications the neutral leg of the circuit can be connected to one of the provided neutral terminals This terminal is energized in the heating mode Install the room thermostat according to the instructions provided with the thermostat See figure 64 for thermostat designations If the furnace is being matched with a heat pump refer to the FM21 installation instruction or appropri ate dual fuel thermostat instructions Indoor Blower Speeds 1 When the thermostat is set to FAN ON the indoor blower will run continuously on the field selectable f
40. URER REQUIREMENTS GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED When the manufacturer of Product Approved side wall horizontally vented gas fueled equipment does not pro vide the parts for venting the flue gases but identifies spe cial venting systems the following requirements shall be satisfied by the manufacturer 1 The referenced special venting system instructions shall be included with the appliance or equipment installation instructions and 2 The special venting systems shall be Product Ap proved by the Board and the instructions for that sys tem shall include a parts list and detailed installation instructions A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment all venting instructions all parts lists for venting instructions and or all venting design instruc tions shall remain with the appliance or equipment at the completion of the installation Page 58
41. US 44W92 or 44W93 Canada FIGURE 40 Not Furnished Page 31 EXHAUST VENT INTAKE AIR 457MM Front View 4 EXHAUST VENT 12 305MM Min above grade or ZA average snow INTAKE accumulation AIR Inches MM optional intake elbo Side View OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT INSTALLATION OF DIRECT VENT WALL TERMINATION KIT 22644 44J40 30628 or 81 20 FIGURE 41 Front View EXHAUST VENT SIZE TERMINATION INTAKE PIPEPER AIR TABLE 8 Top View 1 2 13MM Foam Insulation in Unconditioned Space FIELD e PROVIDED LLLLLLL LLL fe LL REDUCER MAY EXHAUST VENT BE REQUIRED EZZZZZZZZZZZZZr TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION INTAKE AIR 6 152MM MIN lt gt OUTSIDE WALL DIRECT VENT WALL TERMINATION KIT 30G28 or 81J20 FIGURE 42 Front View EXHAUST VENT SIZE TERMINATION O O PIPE PER TABLE 8 INTAKE AIR 1 2 13MM Foam Insulation in Unconditioned Space FIELD PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION Top View LLLLLLL LLL fe LL _ EXHAUST VENT INTAKE AIR 8 206MM MIN OUTSIDE WALL DIRECT VENT WALL TERMINATION KIT 22G44 or 44J40 WALL TERMINATION KITS CLOSE COUPLE EXTENDED VENT FOR GRADE CLEARANCE 2 inch 51 mm 22G44 US inch 76 mm 44040 US If intake and exhaust pipe is less than 12 in 305 MM abov
42. a and metal louvers and grilles will have 60 to 75 percent free area Louvers and grilles must be fixed in the open position or interlocked with the equipment so that they are opened automatically during equipment operation EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE All Air Through Ventilated Attic ROOF TERMINATED EXHAUST PIPE VENTILATION LOUVERS Each end of attic SC an TERMINATED EXHAUST PIPE ALTERNATE LOCATION INLET AIR Ends 12 above bottom NOTE The inlet and outlet air openings shall each have a free area of at least one square inch per 4 000 Btu 645mm per 1 17kW per hour of the total input rating of all equipment in the enclosure FIGURE 8 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE ROOF TERMINATED EXHAUST PIPE 24 SIDE WALL TERMINATED EXHAUST PIPE ALTERNATE LOCATION NOTE Each air duct opening shall have a free area of at least one square inch per 2 000 Btu 645mm per 59kW per hour of the total input rating of all equipment in the enclosure If the equipment room is located against an outside wall and the air openings communi cate directly with the outdoors each opening shall have a free area of at least 1 square inch per 4 000 Btu 645mm per 1 17kW per hour of the total input rating of all other equipment in the enclosure FIGURE 9 Shipping Bolt Removal Units with 1 2 hp blower motor are equipped with three flex ible legs and one rigid leg The r
43. ain Not Furnished Drain Trap Assembly with 1 2 inch Piping 1 25 mm Min 2 50 mm Max Above Top Of Condensate Drain Connection In Unit Drain Trap Assembly Vent Furnished Condensate Drain Connection In Unit FIGURE 59 Page 37 3 4 inch mpt not furnished Condensate Drain Connection In Unit 90 Elbow 3 4 inch PVC Not Furnished Adapter 3 4 inch slip X Condensate Drain Connection In Unit Vent 5 Feet 3 4 inch PVC Pipe Not Furnished Coupling 3 4 inch slip X slip Not Furnished Drain Trap Assembly Furnished Drain Trap Clean Out Drain Trap Assembly with 3 4 inch Piping 1 25 mm Min 2 50 mm Max Above Top Of Condensate Drain Connection In Unit Vent Condensate Drain Connection In Unit Gas Piping Gas supply piping should not allow more than 0 5 W C drop in pressure between gas meter and unit Supply gas pipe must not be smaller than unit gas connection A CAUTION If a flexible gas connector is required or allowed by the authority that has jurisdiction black iron pipe shall be installed at the gas valve and extend outside the furnace cabinet The flexible connector can then be added between the black iron pipe and the gas supply line AWARNING Do not exceed 600 in Ibs 50 ft lbs torque when at taching the gas piping to the gas valve 1 Gas piping may be routed into the unit through either the left or right hand side Supply piping enters into th
44. air intake pipes and all connections for tightness and to make sure there is no blockage NOTE After any heavy snow ice or frozen fog event the furnace vent pipes may become restricted Always check the vent system and remove any snow or ice that may be obstructing the plastic intake or exhaust pipes Electrical 1 Check all wiring for loose connections 2 Check for the correct voltage at the furnace furnace operating 3 Check amp draw on the blower motor Motor Nameplate Actual Winterizing and Condensate Trap Care 1 Turn off power to the furnace 2 Have a shallow pan ready to empty condensate water 3 Remove the clean out cap from the condensate trap and empty water Inspect the trap then reinstall the clean out cap Cleaning The Burner Assembly If cleaning the burner assembly becomes necessary fol low the steps below 1 Turn off electrical and gas power supplies to furnace Remove upper and lower furnace access panels 2 Disconnect the wires from the gas valve 3 Remove the burner box cover if equipped 4 Disconnect the gas supply line from the gas valve Re move gas valve manifold assembly 5 Mark and disconnect sensor wire from the sensor Dis connect wires from flame rollout switches 6 Disconnect combustion air intake pipe It may be nec essary to cut the existing pipe to remove burner box assembly 7 Remove four screws which secure burner box assem bly to vest panel Remove burn
45. an Piping from furnace must slope down a minimum of 1 4 per ft toward trap FIGURE 53 Page 35 EL296UHE With Evaporator Coil Using A Separate Drain Evaporator drain line required Field Provided Vent 1 min 2 max above condensate connection Condensate Drain Connection FIGURE 54 Condensate Trap With Optional Overflow Switch From Evaporator Coil Field Provided Vent Upflow Furnace 1 Min to 2 Max Horizontal Furnace 4 5 Max above condensate drain connection TES FurnaceCondensate Drain Connection Optional d N ch Overflow Switch FIGURE 55 EL296UHE 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 9 PVC Pipe Only Drain Connection Drain d Piping from furnace and evaporator coil must slope down a minimum 1 4 per ft toward trap FIGURE 56 bJ EL296UHE with Evaporator Coil Using a Common Drain A IMPORTANT Evaporator drain T Ms required When combining the furnace and evaporator coil drains together the A C condensate drain outlet must be vented to relieve pressure in or der for the furnace pressure switch to operat
46. an speed LOW HEAT is default when there is no cool ing or heating demand 2 When the EL296UHE is running in the heating mode the indoor blower will run on the LOW HEAT or HIGH HEAT speed per demand 3 When there is a cooling demand the indoor blower will run on the LOW COOL or HIGH COOL speed per demand Generator Use Voltage Requirements The following requirements must be kept in mind when specifying a generator for use with this equipment e The furnace requires 120 volts 10 Range 108 volts to 132 volts e The furnace operates at 60 Hz 5 Range 57 Hz to 63 Hz Page 41 e The furnace integrated control requires both polarity and proper ground Both polarity and proper grounding should be checked before attempting to operate the furnace on either permanent or temporary power e Generator should have a wave form distortion of less than 5 THD total harmonic distortion On Board Links and Diagnostic Push Button Figure 65 AWARNING Carefully review all configuration information pro vided Failure to properly set DIP switches jumpers and on board links can result in improper operation On Board Link W914 Dehum On board link W914 is a clippable connection between ter minals R and DS on the integrated control W914 must be cut when the furnace is installed with a thermostat which features humidity control If the link is not cut terminal DS will remain energized no
47. and the L terminal of the EL296 integrated control Page 48 Unit Start Up FOR YOUR SAFETY READ BEFORE OPERATING AWARNING Do not use this furnace if any part has been under water A flood damaged furnace is extremely dan gerous Attempts to use the furnace can result in fire or explosion Immediately call a qualified ser vice technician to inspect the furnace to replace all gas controls control system parts and electrical parts that have been wet or to replace the furnace if deemed necessary the gas supply fail to shut off or if overheating occurs shut off the gas Danger of explosion Can cause injury valve to the furnace before shutting off the electrical supply or product or property damage Should ACAUTION Before attempting to perform any service or mainte nance turn the electrical power to unit OFF at dis connect switch BEFORE LIGHTING the unit smell all around the fur nace area for gas Be sure to smell next to the floor be cause some gas is heavier than air and will settle on the floor The gas valve on the EL296UHE is equipped with a gas control switch lever Use only your hand to move switch Never use tools If the the switch will not move by hand do not try to repair it Force or attempted repair may result in a fire or explosion Placing the furnace into operation EL296UHE units are equipped with an automatic hot sur face ignition system Do not attempt to manually light burn
48. anger assembly Gas manifold Combustion air inducer Gas valve Main burner cluster Main burner orifices Pressure switch Ignitor Primary limit control Flame rollout switches Page 54 AWARNING ELECTRICAL SHOCK FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in dangerous operation serious injury death or property damage Improper servicing could result in dangerous opera tion serious injury death or property damage Before servicing disconnect all electrical power to furnace When servicing controls label all wires prior to dis connecting Take care to reconnect wires correctly Verify proper operation after servicing At the beginning of each heating season system should be checked as follows by a qualified service technician Blower Check the blower wheel for debris and clean if necessary The blower motors are prelubricated for extended bearing life No further lubrication is needed AWARNING The blower access panel must be securely in place when the blower and burners are operating Gas fumes which could contain carbon monoxide can be drawn into living space resulting in personal inju ry or death Filters All air filters are installed external to the unit Filters should be inspected monthly Clean or replace the filters when necessary to ensure proper furnace operation Table 1 lists recommended filter sizes Exhaust and air intake pipes Check the exhaust and
49. as range hoods and bathroom exhausts so they will oper ate at maximum speed Do not operate a summer ex haust fan Close fireplace dampers 4 Follow the lighting instructions Turn on the appliance that is being inspected Adjust the thermostat so that the appliance operates continuously 5 After the main burner has operated for 5 minutes test for leaks of flue gases at the draft hood relief opening Use the flame of a match or candle After determining that each appliance connected to the common venting system is venting properly step 3 return all doors widows exhaust fans fireplace damp ers and any other gas burning appliances to their pre vious mode of operation If a venting problem is found during any of the preced ing tests the common venting system must be modi fied to correct the problem 1 N D Page 15 Resize the common venting system to the minimum vent pipe size determined by using the appropriate tables in Appendix G These are in the current stan dards of the National Fuel Gas Code ANSI 2223 1 REPLACING FURNACE THAT WAS PART OF A COMMON VENT SYSTEM CHIMNEY ZN OR GAS VENT Check sizing for water heater only FURNACE Replaced by EL296 OPENINGS To Adjacent Room If an EL296UHE furnace replaces a furnace which was commonly vented with another gas appliance the size of the existing vent pipe for that gas ap pliance must be checked Without the heat of
50. at the exhaust outlet not be located within 6 feet 1 8m of a condensing unit because the condensate can damage the painted coating NOTE See table 7 for maximum allowed exhaust pipe length without insulation in unconditioned space during winter design temperatures below 32 F 0 C If required exhaust pipe should be insulated with 1 2 13mm Arma flex or equivalent In extreme cold climate areas 3 4 19mm Armaflex or equivalent may be necessary Insula tion on outside runs of exhaust pipe must be painted or wrapped to protect insulation from deterioration Exhaust pipe insulation may not be necessary in some specific ap plications A IMPORTANT Do not use screens or perforated metal in exhaust terminations Doing so will cause freeze ups and may block the terminations A IMPORTANT For Canadian Installations Only In accordance to CSA International B149 installation codes the minimum allowed distance between the combustion air intake inlet and the exhaust outlet of other appliances shall not be less than 12 inches 305mm Page 24 TABLE 7 Maximum Allowable Exhaust Vent Pipe Length Without Insulation In Unconditioned Space For Winter Design Temperatures Winter Design Vent Pipe Temperatures Diameter 32 to 21 0 to 6 2 Ce Im 20 to 1 ENTE T to 17 2 3i Ge 2 1 2 in 18 to 29 1Refer to 99 Minimum Design Temperature table provided in the current edition of the ASHRAE
51. ated on the unit nameplate Page 8 SETTING EQUIPMENT UPFLOW APPLICATION AIR FLOW FRONT VIEW SIDE VIEW SIDE VIEW HORIZONTAL APPLICATION AIR FLOW FRONT VIEW END VIEW Unit must be level side to side Unit may be positioned from level to 1 2 toward the front to aid in draining FIGURE 11 Page 9 WARNING Improper installation of the furnace can result in per sonal injury or death Combustion and flue products must never be allowed to enter the return air system or air in the living space Use sheet metal screws and joint tape to seal return air system to furnace In platform installations with furnace return the fur nace should be sealed airtight to the return air ple num door must never be used as a portion of the return air duct system The base must provide a stable support and an airtight seal to the furnace Al low absolutely no sagging cracks gaps etc For no reason should return and supply air duct sys tems ever be connected to or from other heating de vices such as a fireplace or stove etc Fire explo sion carbon monoxide poisoning personal injury and or property damage could result Installation Clearances Left Side Right Side din Bottom Floor Front clearance in alcove installation must be 24 in 610 mm Maintain a minimum of 24 in 610 mm for front service access TAllow proper clearances to accommodate condensate trap For installations on a combustible
52. ates a 30 second second stage recognition delay 6 At the end of the recognition delay the integrated con trol energizes the combustion air inducer at high speed The control also checks the high fire second stage pressure switch to make sure it is closed The high fire second stage gas valve is energized and the indoor blower motor is energized for operation at the high fire heating speed 7 When the demand for high fire second stage heat is satisfied the combustion air inducer is switched to the low fire heating speed and the high fire second stage gas valve is de energized The low fire first stage gas valve continues operation The indoor blower motor is switched to the low fire heating speed 8 When the thermostat demand for low fire first stage heat is satisfied the gas valve is de energized and the field selected indoor blower off delay begins The combustion air inducer begins a 5 second post purge period 9 When the combustion air post purge period is com plete the inducer the HUM contacts as well as the 120V ACC terminals are de energized The indoor blower is de energized at the end of the off delay Applications Using A Single Stage Thermostat B Heating Sequence Integrated Control Thermostat Selection DIP Switch 1 ON in Single Stage Position NOTE In these applications two stage heat will be initi ated by the integrated control if heating demand has not been satisfied after the field
53. ation Codes in Canada After determining that each appliance remaining connected to the common venting system properly vents when tested as indicated in step 3 return doors windows exhaust fans fireplace dampers and any other gas burning appliance to their previous condition of use Other Unit Adjustments Primary Limit The primary limit is located on the heating compartment vestibule panel This limit is factory set and requires no ad justment Flame Rollout Switches Two These manually reset switches are located on the front of the burner box Pressure Switch The pressure switch is located in the heating compartment on the cold end header box This switch checks for proper combustion air inducer operation before allowing ignition trial The switch is factory set and must not be adjusted Temperature Rise Place the unit into operation with a second stage heating demand After supply and return air temperatures have stabilized check the temperature rise If necessary adjust the heating blower speed to maintain the temperature rise within the range shown on the unit nameplate Increase the blower speed to decrease the temperature rise Decrease the blower speed to increase the temperature rise Failure to properly adjust the temperature rise may cause erratic limit operation Electrical 1 Check all wiring for loose connections 2 Check for the correct voltage at the furnace furnace operating Correct voltage is
54. ation depend largely on whether the furnace is installed in an unconfined or a confined space Unconfined Space An unconfined space is an area such as a basement or large equipment room with a volume greater than 50 cubic feet 1 42 m3 per 1 000 Btu 29 kW per hour of the com bined input rating of all appliances installed in that space This space also includes adjacent rooms which are not separated by a door Though an area may appear to be un confined it might be necessary to bring in outdoor air for combustion if the structure does not provide enough air by infiltration If the furnace is located in a building of tight construction with weather stripping and caulking around the windows and doors follow the procedures in the Air from Outside section Confined Space A confined space is an area with a volume less than 50 cubic feet 1 42 m per 1 000 Btu 29 kW per hour of the com bined input rating of all appliances installed in that space This definition includes furnace closets or small equipment rooms When the furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space con taining the furnace the return air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace This is especially important when the furnace is mounted on a platform in a confined space such as a closet or small equipment room Even a small
55. be within 12 305mm of the top of the enclosure and one within 12 305mm of the bottom These openings must communicate directly or by ducts with the outdoors or spaces crawl or attic that freely communicate with the outdoors or indirectly through vertical ducts Each opening shall have a mini mum free area of 1 square inch per 4 000 Btu 645mm per 1 17kW per hour of total input rating of all equipment in the enclosure figures 5 and 8 When communicating with the outdoors through horizontal ducts each opening shall have a minimum free area of 1 square inch per 2 000 Btu 645mm per 59kW per total input rating of all equip ment in the enclosure See figure 9 It is also permissible to bring in air for combustion from a ventilated attic figure 6 or ventilated crawl space figure 7 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE Inlet Air from Crawl Space and Outlet Air to Outside VENTILATION LOUVERS Each end of attic ROOF TERMINATED EXHAUST PIPE ZZ SIDE WALL TERMINATED EXHAUST PIPE ALTERNATE LOCATION VENTILATION LOUVERS For unheated crawl space NOTE The inlet and outlet air openings shall each have a free area of at least one square inch per 4 000 Btu 645mm per 1 17kW per hour of the total input rating of all equipment in the enclosure FIGURE 5 EQUIPMENT IN CONFINED SPACE Inlet Air from Ventilated Attic and Outlet Air to Outside Ventilation Louvers Inlet Air A Minimum SS 12 in
56. bows external to the structure must be included in total vent length calculations See vent length tables Requires field provided outdoor 1 1 2 exhaust accelerator 2Concentric kits 71M80 and 44W92 include 1 1 2 outdoor accelerator when used with 045 and 070 input models 3 Flush mount kit 51W11 and 51W12 includes 1 1 2 in outdoor exhaust accelerator required when used with 045 070 and 090 input models 4 Termination kits 30628 44W92 44W93 and 81J20 are certified to ULC S636 for use in Canada only 5 See table 8 for vent accelerator requirements Page 18 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 NOTE Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation Standard Termination at Elevation 0 4500 ft 90 Elbows e 70 115 115 110 110 110 118 114 113 109 108 104 Fw 132 127 122 417 112 107 102 N oa A oo Co o Standard Termination Elevation 4500 10 000 2 1 2 Pipe Number Of 90 Elbows 5 045 07 115 110 105 100 045 07 137 132 127 122 117 112 107 102 gt 93 9 110 135 118 114 113 109 108 104 103 N A N AJ Ei oi aoa ofj j co w
57. clearances to combustible material as listed on the unit nameplate and in the table in figure 12 Accessibility and ser vice clearances must take precedence over fire protection clearances NOTE For installation on combustible floors the furnace shall not be installed directly on carpeting tile or other combustible material other than wood flooring For installation in a residential garage the furnace must be installed so that the burner s and the ignition source are located no less than 18 inches 457 mm above the floor The furnace must be located or protected to avoid physical damage by vehicles When a furnace is installed in a public garage hangar or other building that has a haz ardous atmosphere the furnace must be installed accord ing to recommended good practice requirements and cur rent National Fuel Gas Code or CSA B149 standards NOTE Furnace must be adjusted to obtain a temperature rise within the range specified on the unit nameplate Failure to do so may cause erratic limit operation and premature heat exchanger failure This EL296UHE furnace must be installed so that its electrical components are protected from water Installed in Combination with a Cooling Coil When this furnace is used with cooling coils figure 3 it shall be installed in parallel with or on the upstream side of cool ing coils to avoid condensation in the heating compartment With a parallel flow arrangement a damper or other mean
58. di ameter pipe is used reduce to 2 diameter pipe at the termination point to accommodate the debris screen 3 Use a sheet metal screw to secure the intake pipe to the connector if desired Page 23 CAUTION If this unit is being installed in an application with combustion air coming in from a space serviced by an exhaust fan power exhaust fan or other device which may create a negative pressure in the space take care when sizing the inlet air opening The in iet air opening must be sized to accommodate the maximum volume of exhausted air as well as the maximum volume of combustion air required for all gas appliances serviced by this space EQUIPMENT IN CONFINED SPACE Inlet Air from Ventilated Attic and Outlet Air to Outside Ventilation Louvers A Inlet Air ye AN Minimum SS 12 in 805mm Above E En floor Intake Debris Screen Provided Roof Terminated Exhaust Pipe Furnace See table 6 for maximum vent lengths NOTE The inlet and outlet air openings shall each have a free area of at least one square inch per 4 000 Btu 645mm per 1 17kW per hour of the total input rating of all equipment in the enclosure FIGURE 28 EQUIPMENT IN CONFINED SPACE Inlet Air from Ventilated Crawlspace and Outlet Air to Outside Roof Terminated Exhaust Pipe Inlet Air Minimum 12 in 305mm Above crawl space floor Ventilation Louvers Crawl space n Coupling or m 3 in to 2 in Intak
59. e Field Provided Vent properly 1 to 2 Max above condensate drain connection Condensate Drain Connection FIGURE 57 EL296UHE with Evaporator Coil Using a Common Drain Unit shown in horizontal left hand discharge position Field Provided Vent Evaporator 4 min to 5 Max above Coil condensate drain connection 4 min 5 max a 9 PVC Pipe Only 4 d S7 Condensae Dran Connection 9 Drain e Piping from furnace and evaporator coil must slope down a minimum 1 4 per ft toward trap FIGURE 58 Page 36 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 1 25 mm Min 2 50 mm Max Above Top Of AM Condensate Drain Connection In Unit 90 Street Elbow 3 4 inch PVC Y furnished To Trap 1 2 inch PVC Pipe Optional DrainPiping From Trap Not Furnished Drain Assembly for 1 2 inch Drain Pipe 1 2 inch PVC Pipe Not Furnished d 90 Elbow e 1 2 inch PVC To Not Furnished Drain Drain Assembly for 3 4 inch Drain Pipe CN 90 Elbow 90 Elbow Y 3 4 inch PVC Y 3 4 inch PVC Not Furnished Not Furnished c To TO Coupling 3 4 inch slip X slip Drain Dr
60. e Debris Screen Provided Transition Field Provided See table 6 for maximum vent lengths NOTE The inlet and outlet air openings shall each have a free area of at least one square inch per 4 000 Btu 645mm per 1 17kW per hour of the total input rating of all equipment in the enclosure General Guidelines for Vent Terminations In Non Direct Vent applications combustion air is taken from indoors or ventilated attic or crawlspace and the flue gases are discharged to the outdoors The EL296UHE is then classified as a non direct vent Category IV gas fur nace In Direct Vent applications combustion air is taken from outdoors and the flue gases are discharged to the out doors The EL296UHE is then classified as a direct vent Category IV gas furnace In both Non Direct Vent and Direct Vent applications the vent termination is limited by local building codes In the absence of local codes refer to the current National Fuel Gas Code ANSI Z223 1 NFPA 54 in U S A and current CSA B149 Natural Gas and Propane Installation Codes in Canada for details Position termination according to location given in figure 30 or 31 In addition position termination so it is free from any obstructions and 12 above the average snow accumula tion At vent termination care must be taken to maintain protective coatings over building materials prolonged exposure to exhaust condensate can destroy protective coatings It is recommended th
61. e burners Do not try to light the burners by hand 5 Remove the access panel 6 Move gas valve switch to OFF See figure 66 7 Wait five minutes to clear out any gas If you then smell gas STOP Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instruc tions If you do not smell gas go to next step 8 Move gas valve switch to ON See figure 66 HIGH FIRE ADJUSTMENT MANIFOLD SCREW PRESSURE POST under cap INLET PRESSURE POST eje Hi GAS VALVE SHOWN IN ON POSITION FIGURE 66 9 Replace the access panel 10 Turn on all electrical power to to the unit 11 Set the thermostat to desired setting NOTE When unit is initially started steps 1 through 11 may need to be repeated to purge air from gas line 12 If the appliance will not operate follow the instructions Turning Off Gas to Unit and call your service techni cian or gas supplier Turning Off Gas to Unit 1 Setthe thermostat to the lowest setting 2 Turn off all electrical power to the unit if service is to be performed 3 Remove the access panel Page 49 4 Move gas valve switch to OFF 5 Replace the access panel Failure To Operate If the unit fails to operate check the following 1 Is the thermostat calling for heat 2 Are access panels securely in place 3 Is the main disconnect switch closed 4 Is there a blown fuse or tripped breaker 5 Is the filter dirty or plugged D
62. e gas valve from the side of the valve as shown in figure 61 2 When connecting gas supply factors such as length of run number of fittings and furnace rating must be con sidered to avoid excessive pressure drop Table 10 lists recommended pipe sizes for typical applications NOTE Use two wrenches when connecting gas pip ing to avoid transferring torque to the manifold 99 1 Gas piping must not run in or through air ducts clothes chutes chimneys or gas vents dumb waiters or eleva tor shafts Center gas line through piping hole Gas line should not touch side of unit See figures 61 and 62 Piping should be sloped 1 4 inch per 15 feet 6mm per 5 6m upward toward the gas meter from the furnace The piping must be supported at proper intervals ev ery 8 to 10 feet 2 44 to 3 05m using suitable hangers or straps Install a drip leg in vertical pipe runs to serve as a trap for sediment or condensate 1 5 A 1 8 plugged tap or pressure post is located on the gas valve to facilitate test gauge connection See figure 66 6 In some localities codes may require installation of a manual main shut off valve and union furnished by in staller external to the unit Union must be of the ground joint type AIMPORTANT Compounds used threaded joints of gas piping must be resistant to the actions of liquified petro leum gases Leak Check After gas piping is completed carefully check all pipin
63. e snow accumulation or other obstructions field fabricated piping must be installed FIELD PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION 8 203mm Min for 2 51MM amp 3 76MM DIA pipe between the end of the exhaust pipe and intake pipe WALL SUPPORT 12 305MM Max for 2 51MM Dia Exhaust 508MM Max for 3 76MM Dia Exhaust 20 l EXHAUST 1 2 13 RE i E SS ij FOAM INSULATION UAL Field Furnished INTAKE INTAKE EXHAUST AIR AIR 12 305 MM Minimum 12 305MM Minimum 8 208 mm Min Above Grade or Average Above Grade or Average Snow Accumulation Snow Accumulation LLL die 77 GRADE 12 305 MM Max for 2 51MM Dia Exhaust Use wall support every 24 610 Use two supports if 20 508MM Max for 3 76MM Dia Exhaust extension is greater than 24 but less than 48 FIGURE 44 WALL TERMINATION KITS CLOSE COUPLE EXTENDED VENT FOR GRADE CLEARANCE 2 inch 51 mm 30G28 WTK Canada 3 inch 76 mm 81J20 WTK Canada See Installation Instructions for additional information If intake and exhaust pipe is less than 12 in 305 MM above snow accumulation or other obstructions field FIELD PROVIDED fabricated piping must be installed REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION WALL SUPPORT 12 305 MM Max for 2 51 MM Dia Exhaust 20 508 MM Max for 3
64. ential pressure between the positive gas manifold and the nega tive burner box must be considered 1 Connect the test gauge positive side to manifold pressure tap on gas valve as noted above 2 Tee into the gas valve regulator vent hose and connect to test gauge negative 3 Ignite unit on low fire and let run for 5 minutes to allow for steady state conditions 4 After allowing unit to stabilize for 5 minutes record manifold pressure and compare to value given in table 17 5 f necessary make adjustments Figure 66 shows location of high fire and low fire adjustment screws 6 Repeat steps 3 4 and 5 on high fire See values in table 17 NOTE Shut unit off and remove manometer as soon as an accurate reading has been obtained Re start unit and check gas valve for gas leaks Page 50 Proper Combustion Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking com bustion Take combustion sample beyond the flue outlet and compare to the tables below TABLE 16 EL296 Model High Fire High Fire 110 71 81 138 The maximum carbon monoxide reading should not exceed 50 ppm High Altitude Information NOTE In Canada certification for installations at eleva tions over 4500 feet 1372 m is the jurisdiction of local au thorities Units may be installed at altitudes up to 10 000 ft above sea level without manifold adjustment Units installed at al
65. er 5 f necessary run the condensate line into a conden sate pump to meet drain line slope requirements The pump must be rated for use with condensing furnaces Protect the condensate discharge line from the pump to the outside to avoid freezing 6 Continue with exhaust condensate and intake piping installation according to instructions Page 12 GAS CONNECTION INTAKE PIPE EXHAUST MD Gas connector may be used for Canadian installation if accept able by local authority having jurisdiction SERVICE PLATFORM PLATFORM FIGURE 19 Return Air Horizontal Applications Return air may be brought in only through the end of a fur nace installed in the horizontal position The furnace is equipped with a removable bottom panel to facilitate installation See figure 15 Filters This unit is not equipped with a filter or rack A field pro vided high velocity rated filter is required for the unit to oper ate properly Table 1 lists recommended filter sizes A filter must be in place whenever the unit is operating IMPORTANT If a high efficiency filter is being installed as part of this system to ensure better indoor air quality the fil ter must be properly sized High efficiency filters have a higher static pressure drop than standard ef ficiency glass foam filters If the pressure drop is too great system capacity and performance may be re d
66. er box from the unit 8 Use the soft brush attachment on a vacuum cleaner to gently clean the face of the burners Visually inspect the inside of the burners and crossovers for any block age caused by foreign matter Remove any blockage 9 Reinstall the burner box assembly using the existing four screws Make sure that the burners line up in the center of the burner ports 10 Reconnect the sensor wire and reconnect the 2 pin plug to the ignitor wiring harness Reconnect wires to flame rollout switches Reinstall the gas valve manifold assembly Reconnect the gas supply line to the gas valve Reinstall the burn er box cover 12 Reconnect wires to gas valve 13 Replace the blower compartment access panel 14 Refer to instruction on verifying gas and electrical con nections when re establishing supplies Follow lighting instructions to light and operate fur nace for 5 minutes to ensure that heat exchanger is clean and dry and that furnace is operating properly 16 Replace heating compartment access panel 11 15 Page 55 Start Up amp Performance Check List UNIT SET UP typical Furnace Model Number Serial Number SUBEN AIR ub Line Voltage 1 GAS SUPPLY L Natural Gas _ LP Propane Gas LJ Piping Connections Tight L Leak Tested Flter L Supply Line Pressure W C RETURN AIR
67. ers on this furnace Each time the thermostat calls for heat the burners will automatically light The ignitor does not get hot when there is no call for heat on these units Priming Condensate Trap The condensate trap should be primed with water prior to start up to ensure proper condensate drainage Either pour 10 fl oz 300 ml of water into the trap or follow these steps to prime the trap 1 Follow the lighting instructions to place the unit into op eration 2 Setthe thermostat to initiate a heating demand 3 Allow the burners to fire for approximately 3 minutes 4 Adjust the thermostat to deactivate the heating de mand 5 Wait for the combustion air inducer to stop Set the thermostat to initiate a heating demand and again al low the burners to fire for approximately 3 minutes 6 Adjust the thermostat to deactivate the heating de mand and wait for the combustion air inducer to stop At this point the trap should be primed with sufficient water to ensure proper condensate drain operation AWARNING If you do not follow these instructions exactly a fire or explosion may result causing property damage personal injury or death Gas Valve Operation Figure 66 1 STOP Read the safety information at the beginning of this section 2 Setthe thermostat to the lowest setting 3 Turn off all electrical power to the unit 4 This furnace is equipped with an ignition device which automatically lights th
68. ess of the diameter of pipe used the standard roof and wall terminations described in section Exhaust Piping Terminations should be used Exhaust vent termination pipe is sized to optimize the velocity of the exhaust gas as it exits the termination Refer to table 8 In some applications which permit the use of several differ ent sizes of vent pipe a combination vent pipe may be used Contact Lennox Application Department for assis tance in sizing vent pipe in these applications NOTE The exhaust collar on all models is sized to ac commodate 2 Schedule 40 vent pipe In horizontal ap plications any transition to exhaust pipe larger than 2 must be made in vertical runs of the pipe Therefore a 2 elbow must be added before the pipe is transitioned to any size larger than 2 This elbow must be added to the elbow count used to determine acceptable vent lengths Contact the Application Department for more information concerning sizing of vent systems which include multiple pipe sizes Horizontal Installation Offset Requirements Exhaust Pipe Horizontal Gas Furnace NOTE All horizontal runs of exhaust pipe must slope back to ward unit A minimum of 1 4 6mm drop for each 12 305mm of horizontal run is mandatory for drainage NOTE Exhaust pipe MUST be glued to furnace exhaust fittings NOTE Exhaust piping should be checked carefully to make sure there are no sags or low spots FIGURE 22 TABLE 3 MINIMUM VENT PIPE
69. ettings Blower Off Delay Seconds 90 Factory Switch 5 Cooling Mode Blower Off Delay The unit is shipped from the factory with the dip switch positioned OFF for a 45 second delay Table 12 provides the cooling mode off delay settings TABLE 12 Blower Off Cooling Mode Delay Switch Settings Blower Off Delay Seconds 45 Factory Switches 6 and 7 Continuous Fan Mode Continuous fan speed can be controlled by changing DIP switch posi tions Table 13 below provides DIP switch settings for con tinuous fan mode TABLE 13 Continuous Fan Mode Settings Continuous Fan Low Heat Speed High Cool Speed 44 Thermostat 1 Heat 1 Cool NOTE Use DIP switch 2 to set second stage heat ON delay OFF 7 minutes ON 12 minutes 1 Heat 2 Cool NOTE Use DIP switch 2 to set second stage heat ON delay OFF 7 minutes ON 12 minutes 1 Heat 2 Cool with t stat with humidity control NOTE Use DIP switch 2 to set second stage heat ON delay OFF 7 minutes ON 12 minutes TABLE 14 EL296 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On Board Links See figure 65 DIP Switch 1 Thermostat Heating Stages On Board Links Must Be Cut To Select System Options Wiring Connections FURNACE TERM STRIP OUTDOOR UNIT DO NOT CUT ANY ON BOARD LINKS FURNACE TERM STRIP OUTDOOR UNIT CUT ON BOARD LINK W915 2 STAGE FUR
70. f 2 feet 610mm from the center line of the terminal Equal to or greater than soffit depth Equal to or greater than soffit depth Equal to or greater than soffit depth Equal to or greater than soffit depth No minimum to outside corner No minimum to outside corner Clearance to unventilated soffit Clearance to outside corner Clearance to inside corner Clearance to each side of center line ex tended above meter regulator assembly Clearance to service regulator vent outlet Clearance to non mechanical air 3 feet 9m within a height 15 feet 4 5m above the meter regulator assembly 3 feet 9m 3 feet 9m within a height 15 feet 4 5m above the meter regulator assembly 3 feet 9m 6 inches 152mm for appliances 10 000 6 inches 152mm for appliances 10 000 supply inlet to building or the com Btuh 3kw 9 inches 228mm for ap Btuh 3kw 12 inches 305mm for bustion air inlet to any other ap pliances gt 10 000 Btuh 3kw and 50 000 appliances gt 10 000 Btuh 3kw and pliance Btuh 15 kw 12 inches 305mm for ap 100 000 Btuh 30kw 36 inches 9m pliances gt 50 000 Btuh 15kw for appliances 100 000 Btuh 30kw 3 feet 9m above if within 10 feet 6 feet 1 8m 3m horizontally 7 feet 2 1m Clearance to mechanical air sup ply inlet Clearance above paved sidewalk or paved driveway located on public property M Clearance under veranda porch deck or balcony
71. fore second stage heat is initiated Switch 2 Second Stage Delay Used with Single Stage Thermostat Only This switch is used to deter mine the second stage on delay when a single stage ther mostat is being used The switch is factory set in the OFF position which provides a 7 minute delay before second stage heat is initiated If the switch is toggled to the ON position it will provide a 12 minute delay before second stage heat is initiated This switch is only activated when the thermostat selector jumper is positioned for SINGLE stage thermostat use Indoor Blower Operation DIP Switch Settings Switches 3 and 4 Heating Mode Blower Off Delay The blower on delay of 30 seconds is not adjustable The blower off delay time that the blower operates after the heating demand has been satisfied can be adjusted by moving switches 3 and 4 on the integrated control The unit is shipped from the factory with a blower off delay of 90 se conds The blower off delay affects comfort and is adjust able to satisfy individual applications Adjust the blower off delay to achieve a supply air temperature between 90 and 110 F at the exact moment that the blower is de energized Longer off delay settings provide lower supply air tempera tures shorter settings provide higher supply air temperatu res Table 11 provides the blower off timings that will result from different switch settings TABLE 11 Blower Off Heating Mode Delay Switch S
72. g connections factory and field installed for gas leaks Use a leak detecting solution or other preferred means Never use an open flame to test for gas leaks Check all connections using a commercially available soap solution made specifically for leak detection The furnace must be isolated from the gas supply system by closing its individual manual shut off valve during any pressure testing of the gas supply system at pressures greater than or equal to 1 2 psig 3 48 kPa 14 inches w c MANUAL MAIN SHUT OFF VALVE WILL NOT HOLD NORMAL TEST PRESSURE FURNACE ISOLATE 1 8 N P T GAS VALVE PLUGGED TAP FIGURE 60 AIMPORTANT When testing pressure of gas lines gas valve must be disconnected and isolated See figure 60 Gas valves can be damaged if subjected to pressures greater than 1 2 psig 3 48 kPa AWARNING FIRE OR EXPLOSION HAZARD Failure to follow the safety warnings exactly could result in serious injury death or property damage Never use an open flame to test for gas leaks Check all connections using a commercially available soap solution made specifically for leak detection Some soaps used for leak detection are corrosive to cer tain metals Carefully rinse piping thoroughly after leak test has been completed Page 38 Left Side Piping Right Side Piping Standard Alternate MANUAL MAIN SHUT OFF 2 VALVE N MANUAL EZ W MAIN SHUT OFF VALVE GROUND GROUND JOINT JOINT UNION UN
73. heat exchanger if the combined pri mary drain line were to become restricted NOTE In horizontal applications it is recommended to install a secondary drain pan underneath the unit and trap assembly NOTE Appropriately sized tubing and barbed fitting may be used for condensate drain Attach to the drain on the trap using a hose clamp See figure 52 Page 34 Field Provided Drain Components Barbed Fitting ubing Hose Clamp FIGURE 52 A CAUTION Do not use copper tubing or existing copper conden sate lines for drain line 6 If unit will be started immediately upon completion of installation prime trap per procedure outlined in Unit Start Up section Condensate line must slope downward away from the trap to drain If drain level is above condensate trap condensate pump must be used Condensate drain line should be routed within the conditioned space to avoid freezing of condensate and blockage of drain line 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 15 2m kit no 26K70 CONDENSATE TRAP LOCATIONS Unit shown in upflow position with remote trap Field Provided Vent Min 1 Above Condensate Drain Connection P CPipeOnly t Trap can be installed maximum 5 from furnace To Dr
74. ifications outlined in ASTM D 2855 A DANGER DANGER OF EXPLOSION Fumes from PVC glue may ignite during system check Allow fumes to dissipate for at least 5 minutes before placing unit into operation 1 Measure and cut vent pipe to desired length 2 Debur and chamfer end of pipe removing any ridges or rough edges If end is not chamfered edge of pipe may remove cement from fitting socket and result in a leaking joint NOTE Check the inside of vent pipe thoroughly for any obstruction that may alter furnace operation 3 Clean and dry surfaces to be joined 4 Test fit joint and mark depth of fitting on outside of pipe 5 Uniformly apply a liberal coat of PVC primer for PVC or use a clean dry cloth for ABS to clean inside socket surface of fitting and male end of pipe to depth of fitting Socket NOTE Time is critical at this stage Do not allow prim er to dry before applying cement Promptly apply solvent cement to end of pipe and in side socket surface of fitting Cement should be ap plied lightly but uniformly to inside of socket Take care to keep excess cement out of socket Apply sec ond coat to end of pipe Immediately after applying last coat of cement to pipe and while both inside socket surface and end of pipe are wet with cement forcefully insert end of pipe into socket until it bottoms out Turn PVC pipe 1 4 turn dur ing assembly but not after pipe is fully inserted to dis tribute cement evenly
75. igid leg is equipped with a shipping bolt and a flat white plastic washer rather than the rubber mounting grommet used with a flexible mounting leg See figure 10 The bolt and washer must be re moved before the furnace is placed into operation Af ter the bolt and washer have been removed the rigid leg will not touch the blower housing EL296 Furnaces with 1 2 HP Blower Motor RIGID LEG Remove shipping bolt and washer FIGURE 10 AWARNING Do not connect the return air duct to the back of the furnace Doing so will adversely affect the operation of the safety control devices which could result in personal injury or death A WARNING Blower access panel must be securely in place when blower and burners are operating Gas fumes which could contain carbon monoxide can be drawn into living space resulting in personal injury or death Upflow Applications The EL296UHE gas furnace can be installed as shipped in the upflow position Refer to figure 12 for clearances Select a location that allows for the required clearances that are listed on the unit nameplate Also consider gas supply connections electrical supply vent connection condensate trap and drain connections and installation and service clearances 24 inches 610 mm at unit front The unit must be level from side to side The unit may be positioned from level to 72 toward the front See figure 11 Allow for clearances to combustible materials as indic
76. irty or plugged filters will cause the limit control to shut the unit off 6 Is gas turned on at the meter 7 Is the manual main shut off valve open 8 Is the internal manual shut off valve open 9 Is the unit ignition system in lockout If the unit locks out again inspect the unit for blockages Heating Sequence Of Operation 1 When thermostat calls for heat combustion air inducer starts 2 Combustion air pressure switch proves blower opera tion Switch is factory set and requires no adjustment 3 After a 15 second prepurge the hot surface ignitor en ergizes 4 After a 20 second ignitor warm up period the gas valve solenoid opens A 4 second trial for ignition peri od begins 5 Gas is ignited flame sensor proves the flame and the combustion process continues 6 Ifflame is not detected after first ignition trial the igni tion control will repeat steps 3 and 4 four more times before locking out the gas valve WATCHGUARD flame failure mode The ignition control will then auto matically repeat steps 1 through 6 after 60 minutes To interrupt the 60 minute WATCHGUARD period move thermostat from Heat to OFF then back to Heat Heating sequence then restarts at step 1 Gas Pressure Adjustment Gas Flow Approximate TABLE 15 GAS METER CLOCKING CHART Seconds for One Revolution EL296 II Unit 2 cu ft DIAL 80 160 090 82 02 204
77. j ofj j co See concentric terminations next page Page 19 TABLE 5 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 Of 90 Elbows Used al N A NTN N N pe 31 MIT NI NS Ru o AR N N A wy E N wj j N a A Wy oi o 1 a RE EN NEN e Concentric Termination Elevation 4501 10 000 ft Number Of 90 Elbows Used o e A e A a a N Hl N kat N wo A o A wo N a AR GA A N N gt 3 D AR CA Ru N N a Wi a Om 2 1 2 Pipe ww UN KZ 105 100 AB 121 116 111 106 101 114 109 104 114 109 104 105 100 95 A A A w Aj A co AB N A A A n a Ch 2 1 2 Pipe e A e QUEEN AB 121 116 111 106 101 114 109 104 114 109 104 105 100 95 a a ALO e N d AR o E a SEI o a A M a o N D a A Oo ol Nn A T Page 20 TABLE 6 Maximum Allowable Exhaust Vent Lengths With Furnace In
78. l equipment personal injury can result from contact with sharp sheet metal edges careful when you handle this equipment A DANGER Danger of explosion There are circumstances in which odorant used with LP propane gas can lose its scent In case of a leak LP propane gas will settle close to the floor and may be difficult to smell An LP propane leak detector should be installed in all LP applications Use only the type of gas approved for use with this furnace Refer to unit nameplate EL296UHE units are CSA International certified to ANSI Z21 47 and CSA 2 3 standards Building Codes In the USA installation of gas furnaces must conform with lo cal building codes In the absence of local codes units must be installed according to the current National Fuel Gas Code ANSI Z223 1 NFPA 54 The National Fuel Gas Code is available from the following address American National Standards Institute Inc 11 West 42nd Street New York NY 10036 In Canada installation must conform with current National Standard of Canada CSA B149 Natural Gas and Propane Installation Codes local plumbing or waste water codes and other applicable local codes In order to ensure proper unit operation in non direct vent applications combustion and ventilation air supply must be provided according to the current National Fuel Gas Code or CSA B149 standard Installation Locations This furnace is CSA International certified for installation
79. lings and serves both dwellings t 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 For clearances not specified in ANSI Z223 1 NFPA 54 or CSA B149 1 clearance will be in accordance with local installation codes and the requirements of the gas supplier and these instal lation instructions FIGURE 30 Page 26 VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE US AND CANADA INSIDE CORNER DETAIL GI AIR SUPPLY INLET AREA WHERE TERMINAL VENT TERMINAL IS NOT PERMITTED Canadian Installations 12 inches 305mm or 12 in 305mm above average snow accumulation US Installations 12 inches 305mm or 12 in 305mm above average snow accumulation Clearance above grade veranda porch deck or balcony Clearance to window or 6 inches 152mm for appliances 10 000 6 inches 152mm for appliances 10 000 door that may be opened Clearance to permanently Btuh 3kw 9 inches 228mm for ap pliances gt 10 000 Btuh 3kw and 50 000 Btuh 15 kw 12 inches 305mm for ap pliances 50 000 Btuh 15kw 42 Btuh 3kw 12 inches 305mm for appliances gt 10 000 Btuh 3kw and 100 000 Btuh 30kw 36 inches 9m for appliances gt 100 000 Btuh 30kw 12 closed window Vertical clearance to ventilated soffit located above the terminal within a horizontal distance o
80. lvents such as perchloroethylene Printing inks paint removers varnishes etc Hydrochloric acid Cements and glues Antistatic fabric softeners for clothes dryers Masonry acid washing materials Combustion Dilution amp Ventilation Air If the EL296UHE is installed as a Non Direct Vent Fur nace follow the guidelines in this section NOTE In Non Direct Vent installations combustion air is taken from indoors or ventilated attic or crawlspace and flue gases are discharged out doors In the past there was no problem in bringing in sufficient outdoor air for combustion Infiltration provided all the air that was needed In today s homes tight construction practices make it necessary to bring in air from outside for combustion Take into account that exhaust fans ap pliance vents chimneys and fireplaces force additional air that could be used for combustion out of the house Unless outside air is brought into the house for combus tion negative pressure outside pressure is greater than inside pressure will build to the point that a downdraft can occur in the furnace vent pipe or chimney As a result combustion gases enter the living space creating a po tentially dangerous situation In the absence of local codes concerning air for combus tion and ventilation use the guidelines and procedures in this section to install EL296UHE furnaces to ensure effi cient and safe operation You must consider combustion air needs a
81. me material ABS to PVC or CPVC Transition Solvent Cement CANADA PIPE amp FITTING amp SOLVENT CEMENT PVC amp CPVC Pipe and Fittings PVC amp CPVC Solvent Cement ABS to PVC or CPVC Transition Cement made of PVC Use PVC primer and solvent cement when using PVC vent pipe When using ABS vent pipe use transitional solvent cement to make con nections to the PVC fittings in the unit Use PVC primer and solvent cement or ABS solvent cement meeting ASTM specifications refer to Table 2 As an alter nate use all purpose cement to bond ABS PVC or CPVC pipe when using fittings and pipe made of the same materi als Use transition solvent cement when bonding ABS to ei ther PVC or CPVC Low temperature solvent cement is recommended during installation in cooler weather Metal or plastic strapping may be used for vent pipe hangers Uniformly apply a liberal coat of PVC primer for PVC or use a clean dry cloth for ABS to clean inside socket surface of fitting and male end of pipe to depth of fitting socket Canadian Applications Only Pipe fittings primer and solvent cement used to vent exhaust this ap pliance must be certified to ULC S636 and supplied by a single manufacturer as part of an approved vent ex haust system In addition the first three feet of vent pipe from the furnace flue collar must be accessible for inspection Joint Cementing Procedure All cementing of joints should be done according to the spec
82. meter inches 10 20 0 0 min mm 3 048 6 096 9 144 12 192 5 1 1 1 2 1 610 2090 1430 1150 985 873 791 728 677 635 600 38 1 40 894 59 18 40 49 32 56 27 89 24 72 22 39 20 61 19 17 17 98 17 00 2 2 067 4020 2760 2220 1900 1680 1520 1400 1300 1220 1160 50 8 52 502 113 83 78 15 62 86 53 80 47 57 43 04 39 64 36 81 34 55 32 844 2 1 2 2 469 6400 4400 3530 3020 2680 2480 2230 2080 1950 1840 63 5 67 713 181 22 124 59 99 95 85 51 75 88 70 22 63 14 58 89 55 22 52 10 3 3 068 11300 7780 6250 5350 4740 4290 3950 3670 3450 3260 76 2 77 927 319 98 220 30 176 98 151 49 134 22 121 47 111 85 103 92 97 69 92 31 NOTE Capacity given in cubic feet of gas per hour kilo liters of gas per hour and based on 0 60 specific gravity gas The unit is equipped with a field make up box The make up box may be moved to the right side of the furnace to fa cilitate installation Secure the excess wire to the existing ELECTROSTATIC DISCHARGE ESD harness to protect it from damage Refer to figure 64 for field wiring schematic wiring diagram and troubleshooting CAUTION The power supply wiring must meet Class restrictions Protected by either a fuse or circuit breaker select circuit Precautions and Procedures
83. minutes If the heating demand continues beyond the second stage on delay the integrated control energizes the combustion air inducer at high speed The control also checks the high fire second stage pressure switch to make sure it is closed The high fire second stage gas valve is energized and the indoor blower motor is energized for operation at the high fire heating speed 6 When the thermostat heating demand is satisfied the combustion air inducer begins a 5 second low speed post purge The field selected indoor blower off delay begins The indoor blower operates at the low fire heating speed 7 When the combustion air post purge period is com plete the inducer the HUM contacts as well as the 120V ACC terminals are de energized The indoor blower is de energized at the end of the off delay 1 Repair Parts List The following repair parts are available through Lennox dealers When ordering parts include the complete fur nace model number listed on the CSA nameplate Exam ple EL296UH045XE24B 01 service must be per formed by a licensed professional installer or equivalent service agency or gas supplier Cabinet Parts Outer access panel Blower access panel Top Cap Control Panel Parts Transformer Integrated control board Door interlock switch Blower Parts Blower wheel Motor Motor mounting frame Motor capacitor Blower housing cutoff plate Heating Parts Flame Sensor Heat exch
84. nd requirements for exhaust vents and gas piping A portion of this information has been reprinted with permission from the National Fuel Gas Code ANSI Z223 1 NFPA 54 This reprinted material is not the com plete and official position of the ANSI on the referenced subject which is represented only by the standard in its entirety In Canada refer to the CSA B149 installation codes CAUTION Do not install the furnace in a corrosive or contami nated atmosphere Meet all combustion and ventila tion air requirements as well as all local codes All gas fired appliances require air for the combustion pro cess If sufficient combustion air is not available the fur nace or other appliance will operate inefficiently and un safely Enough air must be provided to meet the needs of all fuel burning appliances and appliances such as exhaust fans which force air out of the house When fireplaces ex haust fans or clothes dryers are used at the same time as the furnace much more air is required to ensure proper combustion and to prevent a downdraft Insufficient air causes incomplete combustion which can result in carbon monoxide In addition to providing combustion air fresh outdoor air di lutes contaminants in the indoor air These contaminants may include bleaches adhesives detergents solvents and other contaminants which can corrode furnace compo nents The requirements for providing air for combustion and ven til
85. ng Terminations for Non Direct Vent Applications Exhaust pipes may be routed either horizontally through an outside wall or vertically through the roof In attic or closet installations vertical termination through the roof is pre ferred Figures 47 through 50 show typical terminations 1 Exhaust piping must terminate straight out or up as shown The termination pipe must be sized as listed in table 8 The specified pipe size ensures proper veloc ity required to move the exhaust gases away from the building 2 On field supplied terminations for side wall exit ex haust piping may extend a maximum of 12 inches 305MM for 2 PVC and 20 inches 508MM for 3 76MM PVC beyond the outside wall See figure 48 SIZE TERMINATION 12 305MM PIPE PER TABLE 8 ABOVE AVE SNOW ACCUMULATIO 1 2 13MM FOAM INSULATION 3 76MM OR UNCONDITIONED ATTIC SPACE 2 51MM PVC PROVIDE SUPPORT FOR EXHAUST LINES NON DIRECT VENT ROOF TERMINATION KIT 15F75 or 44J41 FIGURE 47 Page 33 12 305MM MAX for 2 51MM 20 508MM MAX for 3 76MM 1 2 13MM ARMAFLEX INSULATION IN UNCONDITIONED SPACE 1 2 13MM ARMAFLEX FIELD PROVIDED INSULATION REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION SIZE TERMINATION PIPE PER TABLE 8 PVC REDUCER 12 MIN 305 Above Grade or average snow accumulation NON DIRECT VENT FIELD SUPPLIED WALL TERMINATION OR 15F74
86. ns A conversion kit ordered separately is re quired for use in propane LP gas applications NOTE In Direct Vent installations combustion air is taken from outdoors and flue gases are discharged outdoors In Non Direct Vent installations combustion air is taken from indoors or ventilated attic or crawlspace and flue gases are discharged outdoors See figures 1 and 2 for applications in volving roof termination DIRECT VENT INSTALLATION NON DIRECT VENT INSTALLATION EXHAUST OUTLET EXHAUST OUTLET 74 COMBUSTION AIR INTAKE OUTSIDE OF HOUSE COMBUSTION AIR INTAKE INSIDE OF HOUSE NON DIRECT VENT INSTALLATION NON DIRECT VENT INSTALLATION EXHAUST EXHAUST ra OUTLET OUTLET COMBUSTION AIR INTAKE INSIDE VENTILATED COMBUSTION AIR INTAKE INSID VENTILATED ATTIC SPACE FIGURE 2 Page 3 Shipping and Packing List Package 1 of 1 contains 1 Assembled EL296UHE unit 1 Bag assembly containing the following 1 Snap bushing 1 Snap plug 1 Wire tie 1 Condensate trap 1 Condensate trap cap 1 Condensate trap clamp 1 2 diameter debris screen 1 3 4 Threaded street elbow Check equipment for shipping damage If you find any damage immediately contact the last carrier The following items may also be ordered separately 1 Thermostat 1 LP Propane changeover kit 1 Return air base kit 1 Horizontal suspension kit 1 High altitude pressure switch A CAUTION As with any mechanica
87. ntrol Dual fuel TERM STRIP HEAT PUMP Two Stage CUT ON BOARD LINK g CUT FOR Heat Pum m p EE Ness ComfortSense COMPR 7000 L7724U thermostat w CUT ON BOARD LINK dual fuel capa W951 em bilities HEAT Capable of 2 stage gas heat control Connect W1 to W1 ONLY if using defrost tempering kit 67M41 NOTE Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the EL296 integrated control Page 47 Thermostat Dual Fuel Single Stage Heat Pump ComfortSense 7000 L7742U thermostat w dual fuel capa bilities Capable of 2 stage gas heat control w dehu midification control Dual Fuel Two Stage Heat Pump ComfortSense 7000 L7742U thermostat w dual fuel capa bilities Capable of 2 stage gas heat control w dehu midification TABLE 14 EL296 Field Wiring Applications With Conventional Thermostat Continued DIP Switch Settings and On Board Links figure 65 DIP Switch 1 Thermostat Heating Stages On Board Links Must Be Cut To Select System Options Wiring Connections FURNACE TERM STRIP HEAT PUMP CUT ON BOARD LINK W951 HEAT PUMP CUT ON BOARD LINK W914 DEHUM FURNACE TERM STRIP HEAT PUMP CUT ON BOARD LINK W915 2 STAGE COMPR CUT ON BOARD LIN W951 HEAT PUMP CUT ON BOARD LINK W914 Connect W1 to W1 ONLY if using defrost tempering kit G7M41 NOTE Do NOT make a wire connection between the room thermostat L terminal
88. offit depth No minimum to outside corner No minimum to outside corner Clearance to outside corner Clearance to inside corner Clearance to each side of center line ex tended above meter regulator assembly Clearance to service regulator vent outlet Clearance to non mechanical air supply inlet to building or the com bustion air inlet to any other ap 3 feet 9m within a height 15 feet 4 5m above the meter regulator assembly 3 feet 9m feet 9m within a height 15 feet 4 5m above the meter regulator assembly 3 feet 9m 6 inches 152mm for appliances 10 000 Btuh 3kw 12 inches 305mm for 4 feet 1 2 m below or to side of opening appliances gt 10 000 Btuh 3kw and 1 foot 30 cm above opening 100 000 Btuh 30kw 36 inches 9m for appliances gt 100 000 Btuh 30kw 6 feet 1 8m pliance 3 feet 9m above if within 10 feet 3m horizontally 7 feet 2 1 Clearance to mechanical air sup ply inlet Clearance above paved sidewalk or paved driveway located on public property Clearance under veranda porch deck or balcony 7 feet 2 1m T 12 inches 305mm t 12 inches 305mm t 1 n accordance with the current ANSI Z223 1 NFPA 54 Natural Fuel Gas Code 2 In accordance with the current CSA B149 1 Natural Gas and Propane Installation Code T A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwel
89. ogram and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts The combustion air inducer is ener gized at low speed 2 Once the control receives a signal that the low pres sure switch has closed the combustion air inducer be gins a 15 second pre purge in low speed NOTE If the low fire pressure switch does not close the combustion air inducer will switch to high fire After a 15 second pre purge the high fire pressure switch will close and the unit will begin operation on high fire After 10 to 20 seconds of high fire operation the unit will switch to low fire 3 After the pre purge is complete a 20 second initial ig nitor warm up period begins The combustion air in ducer continues to operate at low speed 4 After the 20 second warm up period has ended the gas valve is energized on low fire first stage and ignition oc curs At the same time the control module sends a sig nal to begin an indoor blower 30 second ON delay When the delay ends the indoor blower motor is ener gized on the low fire heating speed the HUM contacts close energizing the humidifier and 120V ACC termi nal is energized The furnace will continue this opera tion as long as the thermostat has a first stage heating demand 5 If second stage heat is required the thermostat sec ond stage heat contacts close and send a signal to the integrated control The integrated control initi
90. on kit 51W10 may be ordered from Lennox or use equiva lent NOTE Heavy gauge sheet metal straps may be used to suspend the unit from roof rafters or ceiling joists When straps are used to suspend the unit in this way support must be provided for both the ends The straps must not interfere with the plenum or exhaust piping installation Cooling coils and supply and return air plenums must be supported separately HORIZONTAL SUSPENSION KIT d Internal Brace 8 provided with kit Metal Strap Za typical Bracket typical FIGURE 18 NOTE When the furnace is installed on a platform or with the horizontal suspension kit in a crawlspace it must be elevated enough to avoid water damage accommodate drain trap and to allow the evaporator coil to drain Platform Installation of Horizontal Unit 1 Select location for unit keeping in mind service and other necessary clearances See figure 17 2 Construct a raised wooden frame and cover frame with a plywood sheet If unit is installed above finished space install an an auxiliary drain pan under unit Set unit in drain pan as shown in figure 19 Leave 8 inches for service clearance below unit for condensate trap 3 Provide a service platform in front of unit When instal ling the unit in a crawl space a proper support platform may be created using concrete blocks 4 Route auxiliary drain line so that water draining from this outlet will be easily noticed by the homeown
91. pipe size use the shortest length of 2 PVC pipe possible FIGURE 25 Page 22 Intake Piping The EL296UHE furnace may be installed in either direct 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 Follow the next two steps when installing the unit in Direct Vent applications where combustion air is taken from outdoors and flue gases are discharged outdoors The provided air intake screen must not be used in direct vent applications outdoors 1 Use transition solvent cement or a sheet metal screw to secure the intake pipe to the inlet air connector 2 Route piping to outside of structure Continue with installation following instructions given in general guidelines for piping terminations and intake and ex haust piping terminations for direct vent sections Re fer to table 5 for pipe sizes TYPICAL AIR INTAKE PIPE CONNECTIONS UPFLOW NON DIRECT VENT APPLICATIONS INTAKE f DEBRIS SCREEN Provided NOTE Debris screen and elbow may be rotated so that screen may be positioned to face forward or to either side FIGURE 26 TYPICAL AIR INTAKE PIPE CONNECTIONS HORIZONTAL NON DIRECT VENT APPLICATION
92. rawl spaces and utility rooms in the upflow or horizontal position This furnace design has not been CSA certified for installa tion in mobile homes recreational vehicles or outdoors Use of Furnace as Construction Heater Lennox does not recommend the use of EL296UHE units as a construction heater during any phase of construction Very low return air temperatures harmful vapors and op eration of the unit with clogged or misplaced filters will dam age the unit EL296UHE units may be used for heating of buildings or structures under construction if the following conditions are met e The vent system must be permanently installed per these installation instructions e A room thermostat must control the furnace The use of fixed jumpers that will provide continuous heating is not allowed e The return air duct must be provided and sealed to the furnace e Return air temperature range between 60 F 16 and 80 27 must be maintained e Air filters must be installed in the system and must be maintained during construction e Air filters must be replaced upon construction comple tion Page 4 e The input rate and temperature rise must be set per the furnace rating plate e One hundred percent 10096 outdoor air must be pro vided for combustion air requirements during construc tion Temporary ducting may supply outdoor air to the furnace Do not connect duct directly to the furnace Size the temporary duct follo
93. rbon monoxide detector with an alarm is installed on each additional level of the dwell ing building or structure served by the side wall hori zontally vented gas fueled equipment It shall be the responsibility of the property owner to secure the ser vices of qualified licensed professionals for the instal lation of hard wired carbon monoxide detectors a In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic the hard wired carbon monoxide detec tor with alarm and battery back up may be installed on the next adjacent floor level b In the event that the requirements of this subdivi sion cannot be met at the time of completion of installation the owner shall have a period of thirty 30 days to comply with the above requirements provided however that during said thirty 30 day period a battery operated carbon monoxide detec tor with an alarm shall be installed 2 APPROVED CARBON MONOXIDE DETECTORS Each carbon monoxide detector as required in accor dance with the above provisions shall comply with NFPA 720 and be ANSI UL 2034 listed and IAS certi fied SIGNAGE A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight 8 feet above grade di rectly in line with the exhaust vent terminal for the hori zontally vented gas fueled heating appliance or equipment The sign shall read in
94. re 15 Horizontal Applications AWARNING Do not install the furnace on its front or back See figure 16 Bottom Cap Bottom Panel FIGURE 15 FIGURE 16 Page 11 The EL296UHE furnace can be installed in horizontal ap plications with either right or left hand air discharge Refer to figure 17 for clearances in horizontal applications Horizontal Application Installation Clearances Right Hand Discharge Fe LEE Left End Right End SL erg Air gm a Air Flow Wn e Flow Bottom Floor Left Hand Discharge Right End Air Flow Front clearance in alcove installation must be 24 in 610 mm Maintain a minimum of 24 in 610 mm for front service access An 8 service clearance must be maintained below the unit to provide for servicing of the condensate trap For installations on a combustible floor do not install the furnace directly on carpeting tile or other combustible materials other than wood flooring FIGURE 17 Suspended Installation of Horizontal Unit This furnace may be installed in either an attic or a crawl space Either suspend the furnace from roof rafters or floor joists as shown in figure 18 or install the furnace on a platform as shown in figure 19 A horizontal suspensi
95. s to control the flow of air must adequately prevent chilled air from entering the furnace If the damper is manually oper ated it must be equipped to prevent operation of either the heating or the cooling unit unless it is in the full HEAT or COOL setting When installed this furnace must be electrically grounded according to local codes In addition in the United States installation must conform with the current National Electric Code ANSI NFPA No 70 The National Electric Code ANSI NFPA No 70 is available from the following ad dress National Fire Protection Association 1 Battery March Park Quincy MA 02269 In Canada all electrical wiring and grounding for the unit must be installed according to the current regulations of the Canadian Electrical Code Part CSA Standard C22 1 and or local codes Heating Unit Installed Parallel to Air Handler Unit Dampers open during heating operation only Air Handler Unit Dampers open during cooling operation only Heating Unit Installed Upstream of Cooling Coil Cooling Coil FIGURE 3 NOTE This furnace is designed for a minimum continu ous return air temperature of 60 F 16 or an intermit tent operation down to 55 F 13 C dry bulb for cases where a night setback thermostat is used Return air tem perature must not exceed 85 29 dry bulb The EL296UHE furnace may be installed in alcoves clos ets attics basements garages c
96. stalled 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 NOTE Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation Standard Termination at Elevation 0 4500 ft E DEE Po A owg _ Used uc ses euo E we ono 045 07 dE EE 118 51 29 LE ie 117 112 107 j oO Co o a 08 CRM EERIEN E se Fe ws 3 8 5 KON NNI Ls s 93 n a 103 102 9 8 8 7 73 N wo N A a 3 8 3 8 A 97 92 87 82 77 72 oa wo aya oo Standard Termination Elevation 4500 10 000 ft FP Aw FP Number Of 90 Elbows amp AR AR CO wo N ol o M c o Glo N A o A E ol o a CA A wo A Kei pue e gt 2 73 ot 46 4 SEE E EORR 53 48 Page 21 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON DIRECT VENT APPLICATIONS EXHAUST INTAKE EXHAUST INTAKE zs 1 TRANSITI
97. t allowing the blower to reduce to low cool speed upon a call for dehumidification On Board Link W951 Heat Pump R to O On board link W951 is a clippable connection between ter minals R and O on the integrated control W951 must be cut when the furnace is installed in applications which include a heat pump unit and a thermostat which features dual fuel use If the link is left intact terminal will remain ener gized eliminating the HEAT MODE in the heat pump On Board Link W915 2 Stage Compr Y1 to Y2 On board link W915 is a clippable connection between ter minals Y1 and Y2 on the integrated control W915 must be cut if two stage cooling will be used If the Y1 to Y2 link is not cut the outdoor unit will operate in second stage cool ing only Diagnostic Push Button The diagnostic push button is located adjacent to the seven segment diagnostic LED This button is used to en able the Error Code Recall E mode and the Flame Signal F mode Press the button and hold it to cycle through a menu of options Every five seconds a new menu item will be displayed When the button is released the displayed item will be selected Once all items in the menu have been displayed the menu resumes from the beginning until the button is released TYPICAL EL296UHE WIRING DIAGRAM DF045XE36B BLACK BROWN BLUE 120V ACC 510 DFO7OXE48B BLACK BLUE IF USED COMBUSTION AIR cO GV1 DFOSOXEA48C BLACK BLUE BROWN YELLOW INDUCER MOT
98. t less than 48 1219 MM NOTE One wall support must be 6 152MM from top of each pipe intake and exhaust 2 51MM 3 7MM Vent Pipe Vent Pipe A Minimum clearance above grade or average 12 305MM 12 305MM snow accumulation B Maximum horizontal separation between 6 152MM 6 152MM intake and exhaust 8 203MM 8 203MM D Maximum exhaust pipe length 12 305MM 20 508MM E Maximum wall support distance from top of each 6 152MM 6 152MM pipe intake exhaust FIGURE 36 C Minimum from end of exhaust to inlet of intake FIELD FABRICATED WALL TERMINATION OR 15F74 WALL RING TERMINATION KIT With INTAKE ELBOW 1 2 13MM ARMAFLEX INSULATION IN UN CONDITIONED SPACE NOTE FIELD PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION SIZE TERMINATION PER TABLE 8 STRAIGHT APPPLICATION 1 2 134M ARMAFLEX INSULATION IN UNCONDITIONED SPACE WALL SUPPORT EXTENDED APPLICATION See venting table 5 for maximum venting lengths with this arrangement Use wall support every 24 610MM Use two wall supports if extension is greater than 24 610MM but less than 48 1219 MM NOTE One wall support must be 6 152MM from top of each pipe intake and exhaust 2 51MM 3 76MM Vent Pipe Vent Pipe A Minimum clearance above grade average 12 305MM 12 305MM snow accumulation 6 152MM 6 152MM end of exhaust to 6 152
99. take and exhaust piping must be run up a side wall 8 A multiple furnace installation may use a group of up to to position above snow accumulation or other ob four terminations assembled together horizontally as structions piping must be supported every 24 shown in figure 41 610MM as shown in figures 36 and 37 In addition close coupled wall termination kits must be extended for use in this application See figures 44 and 45 When exhaust and intake piping must be run up an outside wall the exhaust piping must be terminated with pipe sized per table 8 The intake piping may be equipped with a 90 elbow turndown Using turndown will add 5 feet 1 5m to the equivalent length of the pipe Alternate Terminations Tee amp Forty Five Degree Elbows Only Ben B Front View of Intake and Exhaust Exhaust TABLE 9 Vent Pipe Vent Pipe A Clearance above hz eos grade or average snow 12 305MM Min 12 305MM Min accumulation B Horizontal separation between 6 152MM Min 6 152MM Min ERA ARAS 24 610MM Max 24 610MM Max C Minimum from end of exhaust to 9 227MM Min 9 227MM Min inlet of intake i 12 305MM Min 12 305MM Min D Exhaust pipe length 405MM 20 508 Max E Wall support distance from top of each pipe 6 152MM Max 6 152MM Max intake exhaust 1 The exhaust termination tee should be connected to the 2 or 3 PVC
100. ted area should be sealed using an appropriate sealant See figure 35 Intake and exhaust pipes may be routed either horizontally through an outside wall or vertically through the roof In at tic or closet installations vertical termination through the roof is preferred Figures 32 through 46 show typical terminations 1 Intake and exhaust terminations are not required to be in the same pressure zone You may exit the intake on one side of the structure and the exhaust on another side figure 33 You may exit the exhaust out the roof and the intake out the side of the structure figure 34 2 Intake and exhaust pipes should be placed as close together as possible at termination end refer to il lustrations Maximum separation is 3 76MM on roof terminations and 6 152MM on side wall termina tions NOTE When venting in different pressure zones the maximum separation requirement of intake and ex haust pipe DOES NOT apply 3 On roof terminations the intake piping should termi nate straight down using two 90 elbows See figure 32 4 Exhaust piping must terminate straight out or up as shown A reducer may be required on the exhaust pip ing at the point where it exits the structure to improve the velocity of exhaust away from the intake piping See table 8 NOTE Care must be taken to avoid recirculation of ex haust back into intake pipe 5 On field supplied terminations for side wall exit ex haust piping ma
101. titude of 4501 10 000 feet 1373 to 3048m may require a pressure switch change which can be ordered separately Table 18 lists conversion kit and pressure switch require ments at varying altitudes The combustion air pressure switch is factory set and re quires no adjustment TABLE 17 Manifold and Supply Line Pressure 0 10 000ft EL296 Manifold Pressure in wg Supply Line Pressure in w g All Sizes NOTE A natural to L P propane gas changeover kit is necessary to convert this unit Refer to the changeover kit installation instruction for the conversion procedure TABLE 18 LP Propane Conversion Kit and Pressure Switch Requirements at Varying Altitudes High Altitude Natural Burner Orifice Kit Natural to EL296 LP Propane Unit High Altitude LP Propane Burner Orifice Kit 0 7500 ft 7501 10 000 ft 7501 10 000 ft 4501 7500ft 7501 10 000 ft 0 2286m 2286 3038m 2286 3038m 1373 2286m 2286 3048m High Altitude Pressure Switch 78W93 73W37 78W96 13 Conversion requires installation of a gas valve manifold spring which is provided with the gas conversion kit Pressure switch is factory set No adjustment necessary All models use the factory installed pressure switch from 0 4500 feet 0 1370 m Page 51 Testing for Proper Venting and Sufficient Combustion Air for Non Direct Vent Applications A WARNING CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined
102. uced The pressure drop may also cause the limit to trip more frequently during the winter and the indoor coil to freeze in the summer resulting in an increase in the number of service calls 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 informa tion is provided in Service and Application Note ACC 00 2 August 2000 TABLE 1 Furnace Cabinet Width Side Return Bottom Return 17 1 2 16 X25 X 1 1 16X25 X1 1 16 X 25 X1 1 20 X 25 X 1 1 24 1 2 16 X 25 X 1 2 24 X 25 X 1 1 Page 13 Duct System Use industry approved standards to size and install the supply and return air duct system Refer to ACCA Manual D This will result in a quiet and low static system that has uniform air distribution NOTE This furnace is not certified for operation in heating mode indoor blower operating at selected heating speed with an external static pressure which exceeds 0 8 inches w c Operation at these conditions may result in improper limit operation Supply Air Plenum If the furnace is installed without a cooling coil a removable access panel should be installed in the supply air duct The access panel should be large enough to permit inspection of the heat exchanger The furnace access panel must al ways be in place when the furnace is operating and it must not allow leaks
103. wing these instructions in section for Combustion Dilution and Ventilation Air in a confined space with air from outside e The furnace heat exchanger components duct system air filters and evaporator coils must be thoroughly cleaned following final construction clean up e All furnace operating conditions including ignition in put rate temperature rise and venting must be verified according to these installation instructions These instructions are intended as a general guide and do not supersede local codes in any way Consult authorities having jurisdiction before installation In addition to the requirements outlined previously the fol lowing general recommendations must be considered when installing an EL296UHE furnace e Place the furnace as close to the center of the air dis tribution system as possible The furnace should also be located close to the vent termination point e When the furnace is installed in non direct vent applica tions do not install the furnace where drafts might blow directly into it This could cause improper combustion and unsafe operation e When the furnace is installed in non direct vent applica tions do not block the furnace combustion air opening with clothing boxes doors etc Air is needed for proper combustion and safe unit operation e When the furnace is installed in an attic or other insu lated space keep insulation away from the furnace e When the furnace is installed
104. y extend a maximum of 12 inches 305MM for 2 PVC and 20 inches 508MM for 3 76MM PVC beyond the outside wall Intake piping should be as short as possible See figures 36 and 37 6 On field supplied terminations a minimum distance between the end of the exhaust pipe and the end of the intake pipe without a termination elbow is 8 and a minimum distance of 6 with a termination elbow See figures 36 and 37 3 76MM MAX SIZE TERMINATION PIPE PER TABLE 8 Inches MM UNCONDITIONED 8 203MM MIN ATTIC SPACE 1 2 13MM FOAM ie coo move ILLA IL S AVERAGE SNOW ACCUMULATION 3 76MM OR 2 51MM PVC PROVIDE SUPPORT FOR INTAKE AND EXHAUST LINES DIRECT VENT ROOF TERMINATION KIT 15F75 or 44J41 FIGURE 32 Exiting Exhaust and Intake Vent different pressure zones Qc Z Ter Air Furnace Minimum 12 in p 305 MM above grade or snow accumulation FIGURE 33 Exiting Exhaust and Intake Vent different pressure zones Roof Terminated Exhaust Pipe Inlet Air Minimum 12 in 305 MM above grade or snow accumulation Furnace FIGURE 34 TABLE 8 EXHAUST PIPE TERMINATION SIZE REDUCTION EL296UHE Termination MODEL Pipe Size 045 and 070 1 1 2 38MM 2 51MM 2 51MM 2 51MM EL296UHE 045 070 and 090 units with the flush mount termination must use the 1 1 2 accelerator supplied with the kit Page 28 7 If in

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