INSTALLATION INSTRUCTIONS EL296UHE E 2013 Lennox Industries Inc. Dallas, Texas, USA ELITE® SERIES GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE 507067-01 02/2013 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.
EL296UHE Unit Dimensions - inches (mm) EXHAUST AIR OUTLET 3−1/4 (83) 1NOTE − 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 and one side return air.
EL296UHE Gas Furnace Shipping and Packing List 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 plications.
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. Heating Unit Installed Parallel to Air Handler Unit Dampers (open during heating operation only) Installation Locations Gas Unit This furnace is CSA International certified for installation clearances to combustible material as listed on the unit nameplate and in the table in figure 12.
D The input rate and temperature rise must be set per the furnace rating plate. D One hundred percent (100%) 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 following these instructions in section for Combustion, Dilution and Ventilation Air in a confined space with air from outside.
piping. A portion of this information has been reprinted with permission from the National Fuel Gas Code (ANSIZ223.1/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.
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 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.
EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE WARNING ROOF TERMINATED EXHAUST PIPE OUTLET AIR SIDE WALL TERMINATED EXHAUST PIPE (ALTERNATE LOCATION) Installation - Setting Equipment 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.
SETTING EQUIPMENT UPFLOW APPLICATION UNIT FRONT UNIT FRONT AIR FLOW AIR FLOW FRONT VIEW SIDE VIEW 1/2” max. SIDE VIEW HORIZONTAL APPLICATION UNIT FRONT AIR FLOW 1/2” max. END VIEW FRONT VIEW Unit must be level side-to-side. Unit may be positioned from level to 1/2” toward the front to aid in draining.
Return Air Guidelines 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. A door must never be used as a portion of the return air duct system.
Optional Return Air Base (Upflow Applications Only) FURNACE FRONT INDOOR AIR QUALITY CABINET (PCO, Filter Cabinet, etc.
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.
Duct System INTAKE PIPE *GAS CONNECTION EXHAUST PIPE *Gas connector may be used for Canadian installation if accept able by local authority having jurisdiction. RAISED PLATFORM SERVICE 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.
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.
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 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.
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 Z223.1.
Use the following steps to correctly size vent pipe diameter. IMPORTANT Do not use screens or perforated metal in exhaust or intake terminations. Doing so will cause freeze-ups and may block the terminations. Piping Size Process 1 What is the furnace capacity? 045, 070, 090, 110 or 135? Which style termination being used? 2 Standard or concentric? See table 4. 3 Which needs most elbows? Intake or exhaust? How many elbows? 4 Count all elbows inside and outside house.
TABLE 4 OUTDOOR TERMINATION USAGE STANDARD Input Size 045 070 090 110 135 Vent Pipe Dia. in.
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.
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.
TABLE 6 Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl Space For Intake Air in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size. NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.
TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS EXHAUST EXHAUST INTAKE INTAKE 2” 2” 2” 2” or 3” 3” TRANSITION 2” TRANSITION 2” *2” *2” 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.
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.
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 let 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.
TABLE 7 Maximum Allowable Exhaust Vent Pipe Length Without Insulation In Unconditioned Space For Winter Design Temperatures Winter Design Temperatures1 °F (°C) 32 to 21 (0 to -6) 20 to 1 (-7 to -17) 0 to -20 (-18 to -29) Unit Input Size Vent Pipe Diameter 045 070 090 110 135 2 in. 20 30 40 24 N/A 2-1/2 in. 15 22 30 40 N/A 3 in. 12 18 25 32 32 2 in 12 20 25 24 N/A 2-1/2 in. 10 14 20 24 N/A 3 in. 6 10 15 20 20 2 in. 8 12 18 22 N/A 2-1/2 in.
VENT TERMINATION CLEARANCES FOR NON-DIRECT VENT INSTALLATIONS IN THE US AND CANADA INSIDE CORNER DETAIL G H A D E B L Fixed Closed Operable F B B C I Fixed Closed Operable M B K J A B AREA WHERE TERMINAL IS NOT PERMITTED AIR SUPPLY INLET VENT TERMINAL US Installations1 A= Clearance above grade, veranda, porch, deck or balcony B= Clearance to window or door that may be opened C= Clearance to permanently closed window D= Vertical clearance to ventilated soffit located above the ter
VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE US AND CANADA INSIDE CORNER DETAIL G H A D E B L Fixed Closed Operable F B B C I Fixed Closed Operable M B A K J B AREA WHERE TERMINAL IS NOT PERMITTED AIR SUPPLY INLET VENT TERMINAL US Installations1 A= Clearance above grade, veranda, porch, deck or balcony B= Clearance to window or door that may be opened C= Clearance to permanently closed window D= Vertical clearance to ventilated soffit located above the terminal
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.
7 - If intake and exhaust piping must be run up a side wall to position above snow accumulation or other ob structions, piping must be supported every 24” (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.
FIELD FABRICATED WALL TERMINATION OR (15F74) WALL RING TERMINATION KIT With INTAKE ELBOW 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 NOTE - FIELD-PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION 1/2” (13MM) ARMAFLEX INSULATION IN UN CONDITIONED SPACE 1/2” (13MM) ARMAFLEX INSULATION IN UN CONDITIONED SPACE SIZE TERMINATION PER TABLE 8 SIZE TERMINATION PE
2” EXTENSION FOR 2” PVC PIPE1” EXTENSION FOR 3” PVC PIPE EXHAUST VENT FURNACE EXHAUST PIPE 4'' 12” (305MM) 5-1/2” (140mm) 5” (127MM) INTAKE AIR 18” MAX. (457MM) FURNACE INTAKE PIPE Front View EXHAUST VENT GLUE EXHAUST END FLUSH INTO TERMINATION FLAT SIDE 12” (305MM) Min. above grade or average snow INTAKE accumulation.
WALL TERMINATION KITS (CLOSE−COUPLE) EXTENDED VENT FOR GRADE CLEARANCE 2 inch (51 mm) 22G44 (US) 3 inch (76 mm) 44J40 (US) If intake and exhaust pipe is less than 12 in. (305 MM) above snow accumulation or other obstructions, field− fabricated piping must be installed. WALL SUPPORT* FIELD-PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION 8” (203mm) Min. for 2” (51MM) & 3” (76MM) DIA. pipe between the end of the exhaust pipe and intake pipe 12” (305MM) Max. for 2” (51MM) Dia.
EL296UHE DIRECT VENT APPLICATION USING EXISTING CHIMNEY 3”-8” (76MM-203MM) 8” - 12” (203MM - 305MM) Minimum 12” (305MM) above chimney top plate or average snow accumulation 12” (305MM) MAX. for 2” (51MM) 20” (508MM) MAX. for 3” (76MM) STRAIGHT-CUT OR ANGLE-CUT IN DIRECTION OF ROOF SLOPE * SHOULDER OF FITTINGS PROVIDE SUPPORT OF PIPE ON TOP PLATE SHEET METAL TOP PLATE PVC REDUCER 12” MIN.
EL296UHE NON-DIRECT VENT APPLICATION USING EXISTING CHIMNEY SIZE TERMINATION PIPE PER TABLE 8. Minimum 12” (305MM) above chimney top plate or average snow accumulation CONDENSATE TRAP AND PLUG LOCATIONS (Unit shown in upflow position) Trap (same on right side) STRAIGHT-CUT OR ANGLE-CUT IN DIRECTION OF ROOF SLOPE 1-1/2 in.
EL296UHE With Evaporator Coil Using A Separate Drain Field Provided Drain Components Evaporator drain line required Elbow Field Provided Vent (1” min. 2” max. above condensate connection) Barbed Fitting Tubing Hose Clamp Condensate Drain Connection FIGURE 52 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.
EL296UHE with Evaporator Coil Using a Separate Drain (Unit shown in horizontal left-hand discharge position) Field Provided Vent (4” min. to 5” max. above condensate connection) Evaporator Coil 4”min 5”max 5’ max. PVC Pipe Only Condensate Drain Connection Drain Pan Piping from furnace and evaporator coil must slope down a minimum 1/4” per ft. toward trap .
TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC Optional Condensate Drain Connection Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) 90° Street Elbow 3/4 inch PVC (not furnished) Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) Condensate Drain Connection In Unit 90° Street Elbow 3/4 inch PVC ( furnished) 1 (25 mm) Min. 2 (50 mm) Max.
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. 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. IMPORTANT Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petro leum gases.
Left Side Piping (Standard) Right Side Piping (Alternate) MANUAL MAIN SHUT-OFF VALVE MANUAL MAIN SHUT-OFF VALVE GROUND JOINT UNION GROUND JOINT UNION DRIP LEG DRIP LEG Gas Valve Gas Valve 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 VALVE MANUAL MAIN SHUT-OFF VALVE Horizontal Application Left-Side Air Discharge GROUND JOINT UNION GROUND JOINT UNION DRIP LEG DRIP
TABLE 10 GAS PIPE CAPACITY - FT3/HR (kL/HR) Nominal Iron Pipe Size inches (mm) Internal Diameter inches (mm) 10 (3.048) 20 (6.096) 30 (9.144) 40 (12.192) 50 (15.240) 60 (18.288) 70 (21.336) 80 (24.384) 90 (27.432) 100 (30.480) 1/2 (12.7) .622 (17.799) 172 (4.87) 118 (3.34) 95 (2.69) 81 (2.29) 72 (2.03) 65 (1.84) 60 (1.69) 56 (1.58) 52 (1.47) 50 (1.42) 3/4 (19.05) .824 (20.930) 360 (10.19) 247 (7.00) 199 (5.63) 170 (4.81) 151 (4.28) 137 (3.87) 126 (3.56) 117 (3.31) 110 (3.
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.
TYPICAL EL296UHE WIRING DIAGRAM FIGURE 64 Page 42
Integrated Control HUM ACC 24VAC Indoor Blower Terminals Ignitor and Combustion Air Inducer Neutrals Flame Sense LED S4 DIP Switches Diagnostic Push Button On Board Links THERMOSTAT CONNECTIONS (TB1) 3/16” QUICK CONNECT TERMINALS FLAME SENSE SIGNAL HI COOL 24VAC HI HEAT 24VAC LO COOL 24VAC LO HEAT 24VAC PARK PARK COMMON 24VAC DS = DEHUMIDIFICATION SIGNAL W2 = HEAT DEMAND FROM 2ND STAGE T/STAT W1 = HEAT DEMAND FROM 1ST STAGE T/STAT R = CLASS 2 VOLTAGE TO THERMOSTAT G = MANUAL FAN FROM T'STAT C = T
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.
TABLE 14 EL296 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links (See figure 65) Thermostat 1 Heat / 1 Cool NOTE - Use DIP switch 2 to set second-stage heat ON delay. OFF-7 minutes. ON-12 minutes. DIP Switch 1 Thermostat Heating Stages On Board Links Must Be Cut To Select System Options ON Wiring Connections S1 T'STAT FURNACE TERM.
TABLE 14 EL296 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links (See figure 65) Thermostat 2 Heat / 2 Cool DIP Switch 1 Thermostat Heating Stages On Board Links Must Be Cut To Select System Options OFF Wiring Connections S1 T'STAT CUT ON-BOARD LINK W915 2 STAGE COMPR FURNACE TERM.
TABLE 14 EL296 Field Wiring Applications With Conventional Thermostat (Continued) Thermostat Dual Fuel Single Stage Heat Pump DIP Switch Settings and On-Board Links (figure 65) DIP Switch 1 On Board Links Must Be Cut To Select Thermostat System Options Heating Stages L7724U T'STAT OFF FURNACE TERM.
TABLE 14 EL296 Field Wiring Applications With Conventional Thermostat (Continued) Thermostat Dual Fuel Single Stage Heat Pump DIP Switch Settings and On-Board Links (figure 65) DIP Switch 1 On Board Links Must Be Cut To Select Thermostat System Options Heating Stages 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 L7742U T'STAT OFF ComfortSense 7000 L7742U thermostat w/ dual fuel capa bilities Capa
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. Unit Start-Up FOR YOUR SAFETY READ BEFORE OPERATING WARNING Do not use this furnace if any part has been under water.
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? Dirty or plugged filters will cause the limit control to shut the unit off.
Proper Combustion High Altitude Information 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 CO2% For Nat CO2% For L.P EL296 Model Low Fire High Fire Low Fire High Fire 045 5.4 - 6.4 7.5 - 8.5 6.4 - 7.4 8.8 - 9.8 070 5.3 - 6.3 7.4 - 8.4 6.3 - 7.3 8.7 - 9.7 090 5.8 - 6.8 7.6 - 8.6 6.8 - 7.8 8.9 - 9.9 110 6.1 - 7.1 8.0 - 9.0 7.
Testing for Proper Venting and Sufficient Combustion Air for Non-Direct Vent Applications WARNING CARBON MONOXIDE POISONING HAZARD! 3- Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monox ide poisoning or death.
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.
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 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.
2 - Check for the correct voltage at the furnace (furnace operating). Service WARNING 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.
Start-Up & Performance Check List UNIT SET UP (typical) Furnace: Model Number_______________ Serial Number_________________ SUPPLY AIR Line Voltage 2 4 1 GAS SUPPLY Natural Gas LP Propane Gas 3 Piping Connections Tight 2 Leak Tested Flter Supply Line Pressure “W.C.
UNIT OPERATION HEATING MODE 1 2 COOLING MODE GAS MANIFOLD PRESSURE “W.C.
Requirements for Commonwealth of Massachusetts Modifications to NFPA-54, Chapter 10 Revise NFPA-54 section 10.8.
