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E 2014 Lennox Industries Inc.
Dallas, Texas, USA
AIR FLOW
HORIZONTAL LEFT
CAUTION
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
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Shipping and Packing List
Safety Information
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Use of Furnace as a Construction Heater
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Combustion, Dilution, Ventilation Air
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Duct System
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Pipe and Fittings Specifications
UPFLOW
HORIZONTAL RIGHT
Table of Contents
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INSTALLATION
INSTRUCTIONS
EL296UHV
®
ELITE
SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
507264-01
07/2014
Supersedes 05/2014
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.
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 HVAC in­
staller (or equivalent), service agency or the gas sup­
plier.
A thermostat is not included and must be ordered
separately.
D The Lennox icomfort Wi-Fi
used in communicating applications.
D In non-communicating applications, the Lennox
ComfortSense
well as other non-communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
Field wiring for both communicating and non-com­
municating applications is illustrated in diagrams,
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Blower Motor Performance
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Gas Pressure Measurement
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High Altitude
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Testing For Sufficient Combustion Air Non-Direct Vent 60
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WARNING
NOTICE
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thermostat must be
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7000 thermostat may be used, as
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Litho U.S.A.
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   Summary of Contents for Lennox EL296UHV

  • Page 1

    ® thermostat must be used in communicating applications. HORIZONTAL RIGHT HORIZONTAL LEFT D In non-communicating applications, the Lennox ® ComfortSense 7000 thermostat may be used, as well as other non-communicating thermostats. In all cases, setup is critical to ensure proper system CAUTION operation.

  • Page 2: Unit Dimensions

    EL296UHV Unit Dimensions - inches (mm) EXHAUST AIR 3−1/4 NOTE − 60C and 60D size units that require air OUTLET (83) volumes 1800 cfm or over (850 L/s) must have one of the following 1−7/8 (48) 1. Single side return air with transition, to accommodate 20 x 25 x 1 in.

  • Page 3: El296uhv Gas Furnace

    1 - Snap bushing zontal or upflow applications with bottom return air. 1 - Snap plug The EL296UHV can be installed as either a Direct Vent 1 - Wire tie or a Non-Direct Vent gas central furnace. 1 - Condensate trap The furnace is equipped for installation in natural gas ap­...

  • Page 4: Use Of Furnace As Construction Heater

    EL296UHV units may be used for heating of buildings or either the heating or the cooling unit, unless it is in the full structures under construction, if the following conditions HEAT or COOL setting.

  • Page 5: General

    Combustion, Dilution & Ventilation Air • When the furnace is installed in non-direct vent applica­ If the EL296UHV is installed as a Non-Direct Vent Fur­ tions, do not install the furnace where drafts might blow nace, follow the guidelines in this section.

  • Page 6

    ing. A portion of this information has been reprinted with When the furnace is installed so that supply ducts carry air permission from the National Fuel Gas Code (ANSI- circulated by the furnace to areas outside the space con­ Z223.1/NFPA 54). This reprinted material is not the com­ taining the furnace, the return air must be handled by ducts plete and official position of the ANSI on the referenced which are sealed to the furnace casing and which terminate...

  • Page 7

    inch per 2,000 Btu (645mm per .59kW) per total input rat­ EQUIPMENT IN CONFINED SPACE ing of all equipment in the enclosure (See figure 5). It is also (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside) permissible to bring in air for combustion from a ventilated attic (figure 6) or ventilated crawl space (figure 7).

  • Page 8: Setting Equipment

    2,000 Btu (645mm per .59kW) per hour of the total The EL296UHV gas furnace can be installed as shipped in input rating of all equipment in the enclosure. If the equipment room is located against an outside wall and the air openings communi­...

  • Page 9

    SETTING EQUIPMENT UPFLOW APPLICATION UNIT UNIT FRONT FRONT AIR FLOW AIR FLOW 1/2” max. FRONT VIEW SIDE VIEW 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. FIGURE 11 Page 9...

  • Page 10

    Fire, explo­ EL296UHV applications which include side return air sion, carbon monoxide poisoning, personal injury and a condensate trap installed on the same side of the and/or property damage could result.

  • Page 11

    Optional Return Air Base (Upflow Applications Only) FURNACE FRONT IF BASE 23 (584) 3−1/4 IS USED Overall (83) (Maximum) WITHOUT Minimum IAQ CABINET, 11 (279) INDOOR AIR A SINGLE Maximum 22−7/16 QUALITY RETURN AIR Unit side return air 14 (356) (570) CABINET PLENUM...

  • Page 12

    The EL296UHV furnace can be installed in horizontal ap­ HORIZONTAL SUSPENSION KIT plications with either right- or left-hand air discharge. Refer to figure 17 for clearances in horizontal applications. Internal Brace Metal Strap (provided with kit) Horizontal Application (typical) Installation Clearances...

  • Page 13: Filters

    Before using any filter with this system, check the to fit the filter frame. specifications provided by the filter manufacturer against the data given in the appropriate Lennox Pipe & Fittings Specifications Product Specifications bulletin. Additional informa­ tion is provided in Service and Application Note All pipe, fittings, primer and solvent cement must conform ACC­00­2 (August 2000).

  • Page 14

    CAUTION IMPORTANT Solvent cements for plastic pipe are flammable liq­ EL296UHV exhaust and intake connections are uids and should be kept away from all sources of made of PVC. Use PVC primer and solvent cement ignition. Do not use excessive amounts of solvent when using PVC vent pipe.

  • Page 15: Joint Cementing Procedure

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

  • Page 16: Venting Practices

    NOTE - Assembly should be completed within 20 sec­ Conduct the following test while each appliance is operat­ onds after last application of cement. Hammer blows ing and the other appliances (which are not operating) re­ should not be used when inserting pipe. main connected to the common venting system.

  • Page 17: Vent Piping Guidelines

    The EL296UHV can be installed as either a Non-Direct REPLACING FURNACE THAT Vent or a Direct Vent gas central furnace. CHIMNEY WAS PART OF A COMMON OR GAS NOTE - In Non‐Direct Vent installations, combustion air is VENT VENT SYSTEM...

  • Page 18

    Use the following steps to correctly size vent pipe diameter. IMPORTANT Do not use screens or perforated metal in exhaust or Piping Size Process intake terminations. Doing so will cause freeze-ups and may block the terminations. What is the furnace capacity? 045, 070, 090, 110 or 135? Which style termination...

  • Page 19

    TABLE 5 Maximum Allowable Intake or Exhaust Vent Length in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size. NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.

  • Page 20

    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 2”...

  • Page 21

    TABLE 6 Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl Space For Intake Air in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.

  • Page 22

    TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS EXHAUST INTAKE EXHAUST INTAKE 2” 2” 2” 2” 3” 3” TRANSITION TRANSITION 2” 2” *2” *2” DO NOT transition from smaller to larger pipe in horizontal runs of exhaust pipe.

  • Page 23

    Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS The EL296UHV furnace may be installed in either direct HORIZONTAL NON−DIRECT VENT APPLICATIONS vent or non-direct vent applications. In non-direct vent (Horizontal Right−Hand Air Discharge Application Shown) applications, when intake air will be drawn into the furnace...

  • Page 24

    The EL296UHV is then classified as a direct vent, all gas appliances serviced by this space. Category IV gas furnace.

  • Page 25

    TABLE 7 Maximum Allowable Exhaust Vent Pipe Length (in ft.)Without Insulation In Unconditioned Space For Winter Design Temperatures Two - Stage High Efficiency Furnace Unit Input Size Winter Design Vent Pipe Temperatures °F (°C) Diameter 2 in. 32 to 21 (0 to -6) 2-1/2 in.

  • Page 26: Vent Termination Clearances

    ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 31...

  • Page 27

    ‡ 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 32 Page 27...

  • Page 28

    Details of Intake and Exhaust Piping Terminations for bow and then every 24” (610mm) as shown in figure 41, to prevent any movement in any direction. When Direct Vent Installations exhaust and intake piping must be run up an outside NOTE - In Direct Vent installations, combustion air is taken wall, the exhaust piping must be terminated with pipe from outdoors and flue gases are discharged to outdoors.

  • Page 29: Front View

    2” (51MM) WALL 2” (51MM) EXHAUST EXHAUST 2” (51MM) VENT VENT *EL296UHV-045, -070 and -090 units with the flush mount termination must use the 1-1/2”accelerator supplied with 12” (305mm) Min. INTAKE the kit. INTAKE CLAMP above grade or (Not Furnished)

  • Page 30

    FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT LARGER VENT PIPE SIZE Vent Pipe Vent Pipe TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...

  • Page 31

    Details of Exhaust Piping Terminations for Non‐Direct EL296UHV NON-DIRECT VENT APPLICATION Vent Applications USING EXISTING CHIMNEY Exhaust pipes may be routed either horizontally through an SIZE TERMINATION STRAIGHT-CUT OR ANGLE-CUT IN DIRECTION PIPE PER TABLE 8. outside wall or vertically through the roof. In attic or closet OF ROOF SLOPE installations, vertical termination through the roof is pre­...

  • Page 32

    4 - Install drain trap using appropriate PVC fittings, glue NOTE - Appropriately sized tubing and barbed fitting all joints. Glue the provided drain trap as shown in fig­ may be used for condensate drain. Attach to the drain ure 52. Route the condensate line to an open drain. on the trap using a hose clamp.

  • Page 33

    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.

  • Page 34

    (1” min. to 2” Max.above condensatedrain connection) Condensate Drain Connection FIGURE 50 EL296UHV with Evaporator Coil Using a Common Drain (Unit shown in horizontal left−hand discharge position) (4” min. to 5” Max.above Evaporator condensatedrain connection) Coil 4”min 5”max...

  • Page 35

    TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC Optional Condensate Drain Connection Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) 90° Street Elbow 3/4 inch PVC (not furnished) Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) Condensate Drain Connection In Unit 1 (25 mm) Min.

  • Page 36: Gas Piping

    6 - In some localities, codes may require installation of a Gas Piping manual main shut‐off valve and union (furnished by in­ Gas supply piping should not allow more than 0.5”W.C. staller) external to the unit. Union must be of the drop in pressure between gas meter and unit.

  • Page 37

    Left Side Piping Right Side Piping (Standard) (Alternate) MANUAL MAIN SHUT-OFF MANUAL VALVE MAIN SHUT-OFF VALVE GROUND GROUND JOINT JOINT UNION UNION DRIP LEG Gas Valve Gas Valve DRIP LEG FIELD PROVIDED AND INSTALLED NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET FIGURE 54 Horizontal Applications Possible Gas Piping Configurations...

  • Page 38

    TABLE 9 GAS PIPE CAPACITY - FT /HR (kL/HR) Nominal Length of Pipe - feet (m) Internal Iron Pipe Diameter Size inches inches (mm) (3.048) (6.096) (9.144) (12.192) (15.240) (18.288) (21.336) (24.384) (27.432) (30.480) (mm) .622 (12.7) (17.799) (4.87) (3.34) (2.69) (2.29) (2.03)

  • Page 39: Electrical

    National Electric Code (ANSI/NFPA No. 70). A green Right Side ground wire is provided in the field make-up box. NOTE - The EL296UHV furnace contains electronic components that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded.

  • Page 40: Which Begin On

    DIP switches 5 and 6. First stage cooling will run at Thermostat Selection 70% cool speed. Communicating NOTE - When the EL296UHV is used with icomfort Wi- CAUTION ® thermostat, proper indoor blower speed selections Field wiring for both communicating and non-com­...

  • Page 41

    -ENABLED Outdoor Unit ® icomfort Wi-Fi Thermostat ® icomfort Wi-Fi Thermostat ® ® icomfort -Enabled EL296UHV Indoor Furnace icomfort -Enabled EL296UHV Indoor Furnace Non-Communicating Outdoor Air Conditioner ® icomfort -Enabled Outdoor Air Conditioner or Heat Pump icomfort®- ENABLED ® icomfort...

  • Page 42

    FIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER FUNC­ IS PRESENT TIONS. BUILT INTO ALL icomfort by Lennoxt OUTDOOR UNITS). 24V HUMIDIFIER CONNECTIONS ® icomfort ENABLED EL296UHV FURNACE Discharge Air Sen­ sor (Required for CS 7000 even heat) THERMOSTAT ®...

  • Page 43

    TABLE 11 EL296 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links (See figure 60) DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 1 Heat / 1 Cool FURNACE OUTDOOR T'STAT...

  • Page 44

    TABLE 11 EL296 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links (See figure 60) DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 2 Heat / 2 Cool FURNACE OUTDOOR T'STAT...

  • Page 45

    TABLE 11 EL296 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links (figure 60) DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat System Options Heating Stages Dual Fuel FURNACE HEAT PUMP L7724U TERM.

  • Page 46

    TABLE 11 EL296 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links (figure 60) DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat System Options Heating Stages Dual Fuel FURNACE HEAT PUMP L7742U TERM.

  • Page 47

    EL296UHV Schematic Wiring Diagram FIGURE 59 Page 47...

  • Page 48: Integrated Control

    Integrated Control HS/ CAI LINE 1 NEUTRAL 7 SEGMENT LED FLAME SENSE INDOOR BLOWER DIAGNOSTIC CONNECTOR PUSH BUTTON DIP SWITCHES 12 PIN LOW OUTDOOR AIR VOLTAGE SENSOR CONNECTOR TERMINALS DISCHARGE AIR W915 Y1 TO Y2 SENSOR 2 STAGE COMPR TERMINALS W951 R TO O TB83 HEAT PUMP...

  • Page 49

    12 pro­ Conventional Thermostat (non-communicating) vides the blower off timings that will result from different EL296UHV units are equipped with a two-stage, variable switch settings. speed integrated control. This control manages ignition TABLE 12...

  • Page 50

    NOTE - The off portion of the selected ramp profile also ap­ Ramping Option D S Motor runs at 100% until demand is satisfied. plies during heat pump operation in dual fuel applications. TABLE 15 S Once demand is met, motor ramps down to stop. Cooling Mode Blower Speed Ramping Ramping Option Switch 9...

  • Page 51: Blower Data

    First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 250 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 250 cfm. Page 51...

  • Page 52

    First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 380 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 380 cfm. Page 52...

  • Page 53

    First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 380 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 380 cfm. Page 53...

  • Page 54

    First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm. Page 54...

  • Page 55

    If the link is left intact the PMW signal from the Har­ ing only. TABLE 18 OPERATING SEQUENCE EL296UHV, Non-Communicating Thermostat with Humidity Control Feature and Single-Speed Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE...

  • Page 56

    TABLE 19 OPERATING SEQUENCE EL296UHV, Non-Communicating Thermostat with Humidity Control Feature and Two-Speed Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Thermostat Demand Relative Humidity Blower System Compressor Comments Condition Status (COOL) NO CALL FOR DEHUMIDIFICATION Normal Opera­ Acceptable 70%*...

  • Page 57: Unit Start Up

    Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor. The gas valve on the EL296UHV is equipped with a gas control switch (lever). Use only your hand to move switch.

  • Page 58: Gas Pressure Adjustment

    NOTE - Pressure test adapter kit (10L34) is available from 4 - After a 20-second ignitor warm-up period, the gas Lennox to facilitate manifold pressure measurement. valve solenoid opens. A 4-second trial for ignition peri­ A manifold pressure post located on the gas valve provides od begins.”...

  • Page 59: Proper Combustion

    Proper Combustion High Altitude Information Furnace should operate minimum 15 minutes with correct NOTE - In Canada, certification for installations at eleva­ manifold pressure and gas flow rate before checking com­ tions over 4500 feet (1372 m) is the jurisdiction of local au­ bustion.

  • Page 60: Repair Parts List

    Repair Parts List The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA nameplate -- Example: EL296UHV045P24B-01. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier.

  • Page 61: Sequence Of Operation

    The two-stage, variable speed integrated control used in heat is satisfied, the gas valve is de-energized and the EL296UHV units has an added feature of an internal field-selected indoor blower off delay begins. The Watchguard control. The feature serves as an automatic...

  • Page 62

    Applications Using A Single-Stage Thermostat 4 - After the 20-second warm-up period has ended, the gas valve is energized on low fire (first stage) and igni­ See figure 63 for ignition control sequence tion occurs. At the same time, the control module B - Heating Sequence -- Integrated Control Thermostat sends a signal to begin an indoor blower 30-second Selection DIP Switch 1 ON in “Single-Stage”...

  • Page 63: Service

    2 - Check for the correct voltage at the furnace (furnace Service operating). 3 - Check amp-draw on the blower motor. Motor Nameplate__________Actual__________ WARNING Winterizing and Condensate Trap Care 1 - Turn off power to the furnace. ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD.

  • Page 64: Program Unit Capacity Size Mode

    Program Unit Capacity/Size Mode Power-Up - Number displayed represents by integrated control unit size code (furnace model − − and capacity). If three horizontal bars are displayed followed by continuous E203, furnace − control does not recognize unit size code. Configure per the following: Furnace control in IDLE mode No heating, cooling or indoor fan operation)

  • Page 65

    Requirements for Commonwealth of Massachusetts Modifications to NFPA-54, Chapter 10 4 - INSPECTION. The state or local gas inspector of the side wall, horizontally vented, gas-fueled equipment Revise NFPA-54 section 10.8.3 to add the following re­ shall not approve the installation unless, upon inspec­ quirements: tion, the inspector observes carbon monoxide detec­...

  • Page 66

    FOR THE PROVINCE OF ONTARIO, HORIZONTAL SIDEWALL VENT APPLICATIONS ONLY For exterior horizontal venting applications, the 2” X 1.5” plume is unobjectionable. If the installation requires more reducer for 2” venting at the point where the exhaust pipe separation between the flue gases and the building struc­ exits the structure is not required in direct or non­direct vent ture, a reducer may be installed on the exhaust pipe to in­...

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