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© 2025 Lennox Industries Inc.
Dallas, Texas USA
WARNING
This furnace is equipped with an ignition control
factory enabled for use with Lennox A2L refrigerant
systems.
Disabling
functionality on A2L system is prohibited by safety
codes. Refer to furnace installation instructions for
non-A2L and non-Lennox refrigerant system setup.
Contents
Unit Dimensions - inches (mm) ......................................2
EL297UHEK Gas Furnace .............................................3
Shipping and Packing List ..............................................3
Safety .............................................................................3
Use of Furnace as a Construction Heaterl .....................4
General ...........................................................................5
Combustion, Dilution, Ventilation Air...............................5
Setting Equipment ..........................................................8
Filters ............................................................................12
Duct System .................................................................12
Pipe Fittings Specifications...........................................13
Joint Cementing Procedure ..........................................13
Venting Practices ..........................................................14
C C C C
I I I I
HI
HI
the
refrigerant
detection
INSTALLATION
INSTRUCTIONS
EL297UHEK
ELITE
SERIES GAS FURNACE
®
UPFLOW / HORIZONTAL AIR DISCHARGE
508577-01
01/2025
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
This is a safety alert symbol and should never be
ignored. When you see this symbol on labels or in man-
uals, be alert to the potential for personal injury or death.
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer (or
equivalent), service agency or the gas supplier.
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
Gas Piping ....................................................................35
Electrical .......................................................................37
Ignition Control .............................................................41
Low GWP Application ...................................................44
Unit Start-Up .................................................................52
Gas Pressure Measurement.........................................53
Proper Combustion.......................................................54
High Altitude .................................................................54
Other Unit Adjustments.................................................55
Sequence of Operation.................................................56
Service..........................................................................57
Repair Parts List ...........................................................58
Start-Up and Perormance Checklist .............................61
Page 1
WARNING
CAUTION
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Summary of Contents for Lennox ELITE EL297UHEK
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Page 1: Table Of Contents
Take care while handling this equipment and wear gloves and This furnace is equipped with an ignition control protective clothing. factory enabled for use with Lennox A2L refrigerant systems. Disabling refrigerant detection functionality on A2L system is prohibited by safety codes. -
Page 2: Unit Dimensions - Inches (Mm)
EL297UHEK Unit Dimensions - inches (mm) NOTE - 60C and 60D size units that require air volumes over 1800 cfm must have one of the following: 1. Single side return air and Optional Return Air Base with transition that must accommodate required 20 x 25 x 1 inch (508 x 635 x 25 mm) air filter to EXHAUST AIR 3-1/4... -
Page 3: El297Uhek Gas Furnace
EL297UHEK Gas Furnace Shipping and Packing List The EL297UHEK Category IV gas furnace is shipped Package 1 of 1 contains ready for installation in the upflow or horizontal position. The furnace is shipped with the bottom panel in place. The 1 - Assembled EL297UHEK unit bottom panel must be removed if the unit is to be installed 1 - Bag assembly containing the following:... -
Page 4: Use Of Furnace As A Construction Heaterl
In Canada, installation must conform with current National Heating Unit Installed Parallell to Air Handler Unit Standard of Canada CSA-B149 Natural Gas and Propane Dampers Installation Codes, local plumbing or waste water codes (open during heating operation only) and other applicable local codes. In order to ensure proper unit operation in non-direct vent Gas Unit applications, combustion and ventilation air supply must... -
Page 5: General
FAILURE TO FOLLOW THE ABOVE INSTALLATION IN- STRUCTIONS VOIDS THE MANUFACTURER’S EQUIP- Permanent wave solutions MENT LIMITED WARRANTY. LENNOX DISCLAIMS Chlorinated waxes and cleaners ALL LIABILITY IN CONNECTION WITH INSTALLER’S Chlorine base swimming pool chemicals FAILURE TO FOLLOW THE ABOVE INSTALLATION IN- Water softening chemicals STRUCTIONS. -
Page 6: Unconfined Space
A portion of this information has been reprinted with per- When the furnace is installed so that supply ducts carry mission from the National Fuel Gas Code (ANSIZ223.1/ air circulated by the furnace to areas outside the space NFPA 54). This reprinted material is not the complete and containing the furnace, the return air must be handled by official position of the ANSI on the referenced subject, ducts which are sealed to the furnace casing and which... - Page 7 Air from Outside EQUIPMENT IN CONFINED SPACE (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside) If air from outside is brought in for combustion and ventila- tion, the confined space shall be provided with two perma- nen openings. One opening shall be within 12” (305mm) Roof Terminated of the top of the enclosure and one within 12”...
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Page 8: Upflow Applications
Installation - Setting Equipment EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE WARNING ROOF TERMINATED EXHAUST PIPE 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 OUTLET AIR injury or death. - Page 9 Return Air Guidelines WARNING Return air can be brought in through the bottom or either Improper installation of the furnace can result in side of the furnace installed in an upflow application. If the personal injury or death. Combustion and flue products furnace is installed on a platform with bottom return, make must never be allowed to enter the return air system an airtight seal between the bottom of the furnace and the...
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Page 10: Horizontal Applications
Optional Return Air Base CONDENSATE (Upflow Applications Only) TRAP FURNACE FRONT 23 (584) 3−1/4 IF BASE Overall (83) IS USED (Maximum) Minimum WITHOUT 11 (279) IAQ CABINET, Maximum 22−7/16 INDOOR AIR A SINGLE Unit side return air 14 (356) (570) QUALITY RETURN AIR Opening... - Page 11 FIGURE 18, or install the furnace installation according to instructions. on a platform, as shown in FIGURE 19. A horizontal sus- pension kit (51W10) may be ordered from Lennox or use *GAS CONNECTION INTAKE PIPE equivalent.
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Page 12: Filters
NOTE - Return air must not be drawn from a room the data given in the appropriate Lennox Product where this furnace, or any other gas-fueled appliance Specifications bulletin. Additional information is provided (i.e., water heater), or carbon monoxide-producing de-... -
Page 13: Pipe Fittings Specifications
CAUTION Pipe & Fittings Specifications All pipe, fittings, primer and solvent cement must conform Solvent cements for plastic pipe are flammable liquids with American National Standard Institute and the Ameri- and should be kept away from all sources of ignition. can Society for Testing and Materials (ANSI/ASTM) stan- Do not use excessive amounts of solvent cement when dards. -
Page 14: Venting Practices
NOTE - Time is critical at this stage. Do not allow 2 - When furnace is installed in a residence where unit is shut down for an extended period of time, such primer to dry before applying cement. as a vacation home, make provisions for draining 6 - Promptly apply solvent cement to end of pipe and condensate collection trap and lines. -
Page 15: Exhaust Piping
7 - If a venting problem is found during any of the Vent Piping Guidelines preceding tests, the common venting system must NOTE - Lennox has approved the use of DuraVent® and be modified to correct the problem. Centrotherm manufactured vent pipe and terminations Resize the common venting system to the minimum as an option to PVC. - Page 16 Two 45 degree elbows are equivalent to one 90 degree elbow. NOTE - Lennox offers a glueless vent adapter kit 17H92 as an option for exhaust exiting at the furnace top cap See max and min length coupling If the kit is not used, the exhaust pipe MUST be tables.
- Page 17 TABLE 4 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Wall Kit 1-1.2 inch 2 inch 3 inch Flush Mount Vent Pipe 2 inch 3 inch Input Size Field 71M80 (US) 69M29 (US) 60L46 (US) Dia. in. 51W11 (US) Fabricated 44W92 44W92 44W93 22G44 (US) 44J40 (US) 51W12...
- 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 Standard Termination at Elevation 0 - 4500 ft Number 1-1/2”...
- Page 19 TABLE 5 Continued Maximum Allowable Intake or Exhaust Vent Length in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size. Concentric Termination at Elevation 0 - 4500 ft Number 1-1/2”...
- Page 20 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 21 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS 2” EXHAUST 2” EXHAUST INTAKE INTAKE 2” 2” 2” 2” 3” 3” 045/070 Only 1−1/2” TRANSITION Exhaust 2” 6” Min Exhaust DO NOT transition from larger to smaller DO NOT transition pipe in horizontal runs from smaller to larger...
- Page 22 Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS HORIZONTAL NON−DIRECT VENT APPLICATIONS The EL297UHEK furnace may be installed in either direct (Horizontal Right−Hand Air Discharge Application Shown) vent or non-direct vent applications. In non-direct vent ap- plications, when intake air will be drawn into the furnace from the surrounding space, the indoor air quality must be considered and guidelines listed in Combustion, Dilution and Ventilation Air section must be followed.
- Page 23 General Guidelines for Vent Terminations CAUTION In Non-Direct Vent applications, combustion air is taken If this unit is being installed in an application with from indoors or ventilated attic or crawlspace and the flue combustion air coming in from a space serviced by an gases are discharged to the outdoors.
- Page 24 TABLE 7 Maximum Allowable Exhaust Vent Pipe Length (in ft. ) Without Insulation In Unconditioned Space For Winter Design Temperatures Two - Stage High Efficiency Furnace Winter Design Unit Input Size Vent Pipe Temperatures1 °F Diameter (°C) 1-1/2 in 32 to 21 2 in (0 to -6) 2-1/2 in...
- Page 25 ‡ Permitted only if veranda, porch, deck or balcony is fully open NOTE - This figure is intended to illustrate clearance on a minimum of two sides beneath the floor. Lennox recommends requirement and does not serve as a substitute for avoiding this location if possible.
- Page 26 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of locally adopted installation codes. two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 33 Page 26...
- Page 27 Details of Intake and Exhaust Piping Terminations for TABLE 8 Direct Vent Installations EXHAUST PIPE TERMINATION SIZE REDUCTION NOTE - In Direct Vent installations, combustion air is taken EL297UHVK MODEL Termination Pipe Size from outdoors and flue gases are discharged to outdoors. *045 and 070 1-1/2”...
- Page 28 7 - If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported. At least FIELD-PROVIDED Accelerator not required REDUCER MAY BE one bracket must be used within 6” from the top of for 3”...
- Page 29 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT Vent Pipe Vent Pipe LARGER VENT PIPE SIZE TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
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Page 30: Condensate Piping
Crawl Space and Extended Horizontal Venting inside trated. In any exterior portion of chimney, the exhaust vent must be insulated. Lennox provides kit 51W18 (USA) and kit 15Z70 (Cana- FIGURE 45 da) to install 2” or 3” PVC exhaust piping through the floor Condensate Piping joists and into the the crawl space. - Page 31 See FIGURE 49, FIGURE on the condensate trap and line. Heating cable kit is 52( upflow furnace) and FIGURE 53. available from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68 and 24 ft. (7.3m) - kit no. 26K69. Page 31...
- Page 32 CONDENSATE TRAP LOCATIONS Furnace With Evaporator Coil Using A Separate Drain (Unit shown in upflow position with remote trap) FieldProvidedVent Evaporator drain Min. 1” Above Condensate line required Drain Connection (Trap at coil is optional) 1” Min. 2” Max. Field Provided Vent (1”...
- Page 33 Furnace 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 5’ max. PVC Pipe Only Condensate Drain Connection (Trap at coil is optional) Drain Pan Piping from furnace and evaporator coil must slope down a minimum 1/4”...
- Page 34 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.
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Page 35: Gas Piping
IMPORTANT Gas Piping Gas supply piping should not allow more than 0.5”W.C. Compounds used on threaded joints of gas piping must drop in pressure between gas meter and unit. Supply gas be resistant to the actions of liquified petroleum gases. pipe must not be smaller than unit gas connection. - Page 36 Upflow Application Upflow Application Left Side Piping Right Side Piping (Standard) (Alternate) 1/2” NPT 1/2” NPT MANUAL MAIN SHUT-OFF VALVE MANUAL MAIN SHUT-OFF VALVE GROUND GROUND JOINT JOINT UNION UNION DRIP LEG FIELD PROVIDED AND INSTALLED DRIP LEG NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET FIGURE 56 Horizontal Applications Possible Gas Piping Configurations...
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Page 37: Electrical
TABLE 9 Gas Pipe Capacity - ft3/hr (m3/hr) Nominal Internal Length of Pipe - feet (m) Iron Pipe Diameter Size Inches inches (3.048) (6.096) (9,144) (12,192) (15.240) (18.288) (21.336) (24.384) (27.432) (30,480) (mm) (mm) .622 (12.7) (17.799) (4.87) (3.34) (2.69) (2.29) (2.03) (1.84) - Page 38 Generator Use - Voltage Requirements CAUTION The following requirements must be kept in mind when Failure to use properly sized wiring and circuit breaker specifying a generator for use with this equipment: may result in property damage. Size wiring and circuit The furnace requires 120 volts + 10% (Range: 108 volts breaker(s) per Product Specifications bulletin (EHB) and to 132 volts).
- Page 39 Wiring Diagram EL297UHEK (Except -135) FIGURE 59 Page 39...
- Page 40 Wiring Diagram EL297UHEK-135 FIGURE 60 Page 40...
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Page 41: Ignition Control
Ignition Control TWO STAGE CONSTANT TORQUE, NON-COMMUNICATING 107897-01 FIGURE 61 TABLE 10 TABLE 11 1/4” QUICK CONNECT TERMINALS THERMOSTAT INPUT TERMINALS LOW STAGE HEAT 120V HUM POWER FOR HUMIDIFIER (120 VAC HIGH STAGE HEAT LINE INCOMING POWER LINE (120 VAC) XFMR TRANSFORMER PRIMARY (120 VAC) LOW STAGE COOL (when W915 is clipped) -
Page 42: Ignition Control Diagnostic Codes
IGNITION CONTROL DIAGNOSTIC CODES DIAGNOSTIC CODES / STATUS OF FURNACE CODE IDLE MODE (DECIMALBLINKS AT 1 HERTZ -- 0.5 SECONDS ON, 0.5 SECONDS OFF INDOOR BLOWER OPERATION: CONTINUOUS FAN MODE (COSTANT TORQUE ONLY) INDOOR BLOWER OPERATION: FOLLOWED BY CFM SETTING FOR INDOOR BLOWER (1 SECOND ON, 0.5 SECOND OFF) / CFM SETTING FOR MODE DISPLAYED (VARIALBE SPEED ONLY) COOLING STAGE (1 SECOND ON, 0.5 SECOND OFF) 1 OR 2 DISPLAYED / PAUSE / REPEAT CODES. - Page 43 IGNITION CONTROL DIAGNOSTIC CODES (CONTINUED) SOFT LOCKOUT FAULTS (60 MINUTES) GAS VALVE RELAY (1ST OR 2ND STAGE) CONTACT SHORTED E205 HOT SURFACE IGNITOR (HSI) SENSED OPEN E207 SOFT LOCKOUT-FLAME FAILURE ON IGNITION, IGNITION RETRY>MAX, LAST FAILED RETRY DUE TO FLAME E270 FAILURE SOFT LOCKOUT-PRESSURE SWITCH OPEN, IGNITION RETRY>MAX, LAST FAILED RETRY DUE TO LPSW OPEN...
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Page 44: Low Gwp Application
Low GWP Application WARNING For use with Lennox approved evaporator coil and LGWP sensors only. Use original manufacturer recommended LGWP sensors if using non Lennox approved evaporator coil. CONNECTING THE FURNACE CONTROL BOARD SENSOR. See FIGURE 64 and follow steps below: 1 - Route sensor wire #1 through provided grommet. - Page 45 FURNACE CONTROL BOARD LOW GWP MODES OF 2. The furnace control board activates the blower (high OPERATION speed). The blower purges refrigerant from the cabinet, plenum, and ductwork. The modes of operation for the furnace control board are Initializing, Normal, Leak Detected, and Fault. 3.
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Page 46: Start-Up Procedure
LGWP TEST BUTTON FUNCTIONALITY External Alarm (For applications with external alarms wired directly to the The furnace control board is equipped with a Test/Reset furnace control board) push button. The Test button can be used to perform sev- The furnace control board triggers the external alarm sys- eral functions, depending on the mode of operation of the tem when it enters Leak Detected mode. - Page 47 TABLE 16 Integrated Control DIP Switch Settings EL297UHEK units are equipped with a two-stage integrat- Blower Off Heating Mode Delay Switch Settings ed control. This control manages ignition timing, heating Blower Off Delay Switch 3 Switch 4 mode fan off delays and indoor blower speeds based on Seconds selections made using the control dip switches and jump- ers.
- Page 48 TABLE 19 EL297UHEK Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 1 Heat / 1 Cool FURNACE OUTDOOR T'STAT TERM.
- Page 49 TABLE 19 EL297UHEK Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 2 Heat / 2 Cool FURNACE OUTDOOR T'STAT...
- Page 50 TABLE 19 EL297UHEK Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages FURNACE HEAT PUMP Dual Fuel T'STAT TERM.
- Page 51 TABLE 19 EL297UHEK Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages FURNACE HEAT PUMP Dual Fuel T'STAT TERM.
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Page 52: Unit Start-Up
6 - Adjust the thermostat to deactivate the heating Unit Start-Up demand and wait for the combustion air inducer to FOR YOUR SAFETY READ BEFORE OPERATING stop. At this point, the trap should be primed with sufficient water to ensure proper condensate drain WARNING operation. -
Page 53: Supply Pressure Measurement
NOTE - Pressure test adapter kit (10L34) is available from 6 - Is gas turned on at the meter? Lennox to facilitate manifold pressure measurement. A manifold pressure post located on the gas valve pro- 7 - Is the manual main shut-off valve open? vides access to the manifold pressure. -
Page 54: 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 bustion. -
Page 55: Other Unit Adjustments
6 - Follow the lighting instruction to place the appliance Testing for Proper Venting and Sufficient Combus- being inspected into operation. Adjust thermostat so tion Air for Non-Direct Vent Applications appliance will operate continuously. WARNING 7 - Use the flame of match or candle to test for spillage of flue gases at the draft hood relief opening after 5 minutes of main burner operation. -
Page 56: Sequence Of Operation
7 - When the demand for high fire (second stage) heat Heating Sequence of Operation is satisfied, the combustion air inducer is switched to Electronic Ignition the low-fire heating speed and the high-fire (second stage) gas valve is de-energized. The low-fire (first The two-stage, variable speed integrated control used in stage) gas valve continues operation. -
Page 57: Service
At the beginning of each heating season, and to comply and operation. Consult Service Literature for proper with the Lennox Limited Warranty, your system should be combustion values. checked as follows: 14- Verify operation of CO detectors and replace 1 - Check wiring for loose connections, voltage at batteries as required. -
Page 58: Repair Parts List
3 - Clock gas meter to ensure that the unit is operating at Repair Parts List the specified firing rate for each stage of operation. The following repair parts are available through Lennox Check the supply pressure and the manifold pressure dealers. When ordering parts, include the complete fur- on both low fire and high fire. -
Page 59: Approved Carbon Monoxide Detectors
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 shall not approve the installation unless, upon requirements: inspection, the inspector observes carbon monoxide For all side wall, horizontally vented, gas-fueled equip-... - Page 60 ADDENDUM FOR ALL PROVINCES OF CANADA See below for venting in all provinces of Canada. Lennox approves the following termination for use in all provinces of Canada. 12” 2” (51MM) 3” (76MM) Vent Pipe Vent Pipe A − Clearance above grade or 12”...
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Page 61: Unit Setup
Start-Up & Performance Check List UNIT SET UP (typical) Furnace: Model Number_______________ Serial Number_________________ SUPPLY Line Voltage GAS SUPPLY LP Propane Gas Natural Gas Piping Connections Tight Leak Tested Flter Supply Line Pressure “W.C.________ RETURN AIR Gas Supply Pressure DUCT SYSTEM SUPPLY AIR DUCT Sealed INTAKE / EXHAUST PIPE... -
Page 62: Unit Operation
UNIT OPERATION HEATING MODE COOLING MODE GAS MANIFOLD PRESSURE “W.C._____ INDOOR BLOWER AMPS______ COMBUSTION SAMPLE CO CO PPM_______ TEMPERATURE DROP ______ Return Duct Temperature _________ INDOOR BLOWER AMPS______ Supply Duct Temperature _______ Temperature Drop = _________ TEMPERATURE RISE TOTAL EXTERNAL STATIC (dry coil) Supply Duct Temperature ________ Supply External Static _______ Return Duct Temperature... - Page 63 TABLE 24 Allowable Heating Speeds EL297UH Low Fire Heating Speeds High Fire Heating Speeds Model Yellow Blue Brown Black Yellow Blue Brown Black Number 045XE36BK Allowed Factory 070XE36BK Allowed Setting Allowed 090XE48CK Allowed Allowed Allowed Allowed Allowed Allowed Allowed 110XE60CK Factory Allowed Setting...
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