Page 2 - SUPPLY AIR; FRONT VIEW
Page 2 Unit Dimensions − inches (mm) AIR FLOW 23 (584) (19) 3/4 (19) 1 Bottom Return Air Opening GAS PIPING INLET (Either Side) Side Return Air Opening (Either Side) 1 Bottom Return Air Opening FLUE OUTLET (Top) ELECTRICAL INLET (Either Side) SUPPLY AIR OPENING FRONT VIEW SIDE VIEW TOP VIEW AB 9/16 ...
Page 3 - Parts Arrangement; FIGURE 1
Page 3 Parts Arrangement FIGURE 1 Combustion Air Pressure Switch Combustion Air Inducer Gas Valve and Manifold Assembly Limit Switch (under collector box) Collector Box Heat Exchanger Integrated Control Indoor Blower and Motor Assembly (removed from cabinet) Indoor Blower and Motor Assembly (install...
Page 4 - Shipping and Packing List; Package 1 of 1 contains; Safety Information; DANGER; WARNING; Certifications
Page 4 EL280UH Gas Furnace The EL280UH unit is shipped ready for installation in theupflow or horizontal right position (for horizontal left posi-tion the combustion air pressure switch must be moved).The furnace is shipped with the bottom panel in place. Thebottom panel must be removed if the unit ...
Page 5 - Heating Unit Installed Upstream of Cooling Unit; Gas Unit; Use of Furnace as Construction Heater
Page 5 Installed in Combination with a Cooling Coil When this furnace is used with cooling units, it shall beinstalled in parallel with, or on the upstream side of, coolingunits to avoid condensation in the heating compartment.See figure 2. With a parallel flow arrangement, a damper (orother means t...
Page 6 - Product contains fiberglass wool.; CAUTION
Page 6 D Do not install the furnace where drafts might blow direct-ly into it. This could cause improper combustion and un-safe operation. D Do not block the furnace combustion air openings withclothing, boxes, doors, etc. Air is needed for propercombustion and safe unit operation. D When the furnac...
Page 7 - FIGURE 3
Page 7 Unconfined Space An unconfined space is an area such as a basement orlarge equipment room with a volume greater than 50 cubicfeet (1.42 m 3 ) 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 ...
Page 8 - FIGURE 4
Page 8 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE (Inlet Air from Crawlspace and Outlet Air to Ventilated Attic) NOTE−The inlet and outlet air openings shall each have a free area of at least one square inch (645 mm 2 ) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipmen...
Page 9 - Setting Equipment; The unit must be level.; Upflow Applications; Upflow Application Installation Clearances; FIGURE 8
Page 9 Setting Equipment WARNING Do not install the furnace on its front or its back. Donot connect the return air ducts to the back of the fur-nace. Doing so will adversely affect the operation ofthe safety control devices, which could result in per-sonal injury or death. The EL280UH gas furnace ca...
Page 10 - − Single side return air with transition to accommodate 20; Refer to Engineering Handbook for additional information.; Transition; Single Side Return Air; SIDE VIEW; SIDE RETURN
Page 10 Return Air −− Upflow Applications Return air can be brought in through the bottom or eitherside of the furnace installed in an upflow application. If thefurnace is installed on a platform with bottom return, makean airtight seal between the bottom of the furnace and theplatform to ensure tha...
Page 11 - Horizontal Applications
Page 11 Removing the Bottom Panel Remove the two screws that secure the bottom cap to thefurnace. Pivot the bottom cap down to release the bottompanel. Once the bottom panel has been removed, reinstallthe bottom cap. See figure 11. Removing the Bottom Panel FIGURE 11 Screw Bottom Panel Bottom Cap Ho...
Page 12 - Filters; TABLE 1; Duct System; NOTE −
Page 12 Horizontal Application Unit Installed on Platform FIGURE 14 clearances. GAS ENTRY VENT PIPE See the unit nameplate for Line contact is permissible but not preferred SERVICE PLATFORM WARNING Improper installation of the furnace can result in per-sonal injury or death. Combustion and flue prod...
Page 13 - Venting; Mounting Screws Location; UPFlow Position; Top Vent Discharge; IMPORTANT; − Remove the four mounting screws which secure the; Left Side Vent Discharge; UPFLOW POSITION; Right Side Vent Discharge
Page 13 Venting A 4−inch diameter flue transition is factory-installed on thecombustion air inducer outlet of all models. Figure 16 shows the combustion air inducer as shipped from thefactory. FIGURE 15 Mounting Screws Location Mounting Screws UPFlow Position FIGURE 16 UPFLOW POSITION Top Vent Disch...
Page 14 - Horizontal Position; HORIZONTAL LEFT POSITION; Side Vent Discharge; HORIZONTAL RIGHT POSITION
Page 14 Horizontal Position FIGURE 19 HORIZONTAL LEFT POSITION Top Vent Discharge S Disconnect pressure switch hose from barbed fitting on the pres- sure switch assembly. Remove pressure switch assembly (1screw) and cut wire tie to free pressure switch wires. Re−installpressure switch on the other s...
Page 15 - VENT CONNECTION UPFLOW AND HORIZONTAL POSITION
Page 15 The EL280UH series units are classified as fan−assistedCategory I furnaces when vertically vented according tothe latest edition of National Fuel Gas Code (NFPA 54 /ANSI Z223.1) in the USA. A fan−assisted Category I fur-nace is an appliance equipped with an integral mechanicalmeans to either...
Page 16 - Common Venting Using Metal−Lined Masonry Chimney; General Venting Requirements
Page 16 FIGURE 24 Common Venting Using Metal−Lined Masonry Chimney 4 in. (102 mm) minimum MIN. LENGTH −− AS SHORT AS PRACTICAL MAX. LENGTH−− SEE NOTE 1 BELOW. SEALED PERMANENTLY SEALED FIREPLACE OPENING EXTERIOR CHIMNEY WITH METAL LINER VENT CONNECTOR NOTE 1 − Refer to the provided venting tables fo...
Page 17 - TABLE 2; Connector Diameter
Page 17 FIGURE 25 Common Venting Using Tile−Lined Interior Masonry Chimney and Combined Vent Connector MINIMUM LENGTH = AS SHORT AS PRACTICAL. FOR MAXIMUM LENGTH SEE NOTE TO LEFT INTERIOR TILE−LINEDMASONRY CHIMNEY NOTE − the chimney must be properlysized per provided venting tables orlined with list...
Page 23 - Gas Piping; Gas Supply; NOTE − Capacity given in cubic feet (m
Page 23 Gas Piping Gas supply piping should not allow more than 0.5"W.C. dropin pressure between gas meter and unit. Supply gas pipemust not be smaller than unit gas connection. CAUTION If a flexible gas connector is required or allowed bythe authority that has jurisdiction, black iron pipeshall...
Page 24 - Horizontal Application
Page 24 GROUND JOINT UNION AUTOMATIC GAS VALVE FIELD PROVIDED AND INSTALLED GROUND JOINT UNION Left Side Piping (Standard) Right Side Piping (Alternate) AUTOMATIC GAS VALVE DRIP LEG DRIP LEG MANUAL MAIN SHUT−OFF VALVE (With 1/8 in. NPT Plugged Tap Shown) MANUAL MAIN SHUT−OFF VALVE (With 1/8 in. NPT ...
Page 25 - Leak Check; Electrical; Precautions and Procedures
Page 25 Leak Check After gas piping is completed, carefully check all pipingconnections (factory− and field−installed) for gas leaks. Usea leak detecting solution or other preferred means. NOTE − If emergency shutoff is necessary, shut off the mainmanual gas valve and disconnect the main power to th...
Page 27 - DIP Switch Settings and On−Board Links (See figure 33)
Page 27 TABLE 10 Field Wiring Applications Thermostat DIP Switch Settings and On−Board Links (See figure 33) Wiring Connections DIP Switch 1 W915 Two−Stage Cooling W951 Heat Pumps 1 Heat / 1 Cool NOTE − Use DIPswitch 2 to set sec-ond−stage heat ONdelay.OFF10 minutes.ON−15 minutes. ON Intact Intact S...
Page 29 - EL280UH SCHEMATIC WIRING DIAGRAM
Page 29 FIGURE 31 120V EAC FACTORY DEFAULT IS FOR A 2 STAGE THERMOSTAT 9 9 123 456 789 10 1112 TERMINAL #1 IS USED FOR ERROR CODE RECALL ONLY. SEE INSTALLATION INSTRUCTIONS FOR DETAILS. K1 K4 K9 K6 K8 HI HEA T LO HEA T K10 K11 24V POWER IS PROVIDED FOR OPTIONAL HUMIDIFIER DURING HEAT DEMAND 2011 EL2...
Page 30 - DIP SWITCH FUNCTIONS
Page 30 TYPICAL EL280UH FIELD WIRING DIAGRAM FIGURE 32 FIGURE 33 TWO−STAGE INTEGRATED CONTROL THERMOSTAT CONNECTIONS (TB1) 1/4" QUICK CONNECT TERMINALS DIP SWITCH FUNCTIONS DIP SWITCHES DIAGNOSTIC LEDs ON−BOARD LINKS 1= ERROR CODE RECALLH= 24V HUMIDIFIER OUTPUTL= LENNOX SYSTEM OPERATION MONITOR ...
Page 31 - Integrated Control; Select OFF
Page 31 Integrated Control EL280UH units are equipped with a two−stage integratedcontrol. This control manages ignition timing and fan offdelays based on selections made using the control DIPswitches. The control includes an internal watchguard fea-ture which automatically resets the integrated cont...
Page 32 - Unit Start−Up
Page 32 Unit Start−Up FOR YOUR SAFETY READ BEFORE LIGHTING WARNING 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 infire or explosion. Immediately call a qualified ser-vice technician to inspect the fu...
Page 33 - Gas Pressure Adjustment; NOTE; Proper Combustion; ALL; High Altitude
Page 33 9 − Is the unit ignition system in lock out? If the unit locks out again, call the service technician to inspect the unit forblockages. 10 − Is pressure switch closed? Obstructed flue will cause unit to shut off at pressure switch. Check flue and outletfor blockages. 11 − Are flame rollout s...
Page 34 - Manifold Pressure Settings at all Altitudes; Natural; Pressure Switch and Gas Conversion Kits at all Altitudes; No Change
Page 34 TABLE 14 Manifold Pressure Settings at all Altitudes Unit Input Gas Manifold Pressure in.wg. 0−4500 ft. Manifold Pressure in.wg. 4501−7500 ft. 1 Manifold Pressure in.wg. 7501 − 10,000 ft. 2 Supply Line Pressure in. w.g. Low Fire High Fire Low Fire High Fire Low Fire High Fire Min Max 070 Nat...
Page 35 - Other Unit Adjustments
Page 35 Other Unit Adjustments Primary and Secondary Limits The primary limit is located on the heating compartmentvestibule panel. The secondary limits (if equipped) are lo-cated in the blower compartment, attached to the back sideof the blower. These auto reset limits are factory−set and re-quire ...
Page 36 - Heating Sequence of Operation; Two−Stage Thermostat, Two Stage Heat. Dip Switch
Page 36 Heating Sequence of Operation When there is a call for heat, the integrated control runs aself check. The control checks for S10 primary limit, S21secondary limit (s) and S47 rollout switch normally closedcontacts. The control also checks for S102 high heat andS128 low heat prove switch norm...
Page 37 - BLOWER DATA
Page 37 BLOWER DATA EL280UH070P24A PERFORMANCE (Less Filter) External Static Pressure in. w.g. Air Volume / Watts at Various Blower Speeds High Medium Low cfm Watts cfm Watts cfm Watts 0.10 1135 439 990 369 845 299 0.20 1115 429 975 358 820 289 0.30 1085 410 955 348 790 279 0.40 1045 389 925 335 775...
Page 39 - Service; Blower
Page 39 Service WARNING ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Failure to follow safety warnings exactly could resultin dangerous operation, serious injury, death orproperty damage.Improper servicing could result in dangerous opera-tion, serious injury, death, or property damage.Before servici...
Page 43 - Integrated Control Diagnostic Codes; FLASH CODE
Page 43 Integrated Control Diagnostic Codes FLASH CODE (X + Y) STATUS / ERROR DESCRIPTION FLASH CODE DESCRIPTIONS Pulse A 1/4 second flash followed by four seconds of off time. Heartbeat Constant 1/2 second bright and 1/2 second dim cycles. X + Y LED flashes X times at 2Hz, remains off for two secon...
Page 44 - Troubleshooting: Heating Sequence of Operation; HEATING SEQUENCE OF OPERATION; CONTINUED ON NEXT PAGE
Page 44 Troubleshooting: Heating Sequence of Operation HEATING SEQUENCE OF OPERATION NORMAL AND ABNORMAL HEATING MODE CONTROL SELF−CHECK OKAY? YES GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF. (RESET CONTROL BY TURNING MAIN POWER OFF.) NO POLARITY REVERSED. STATUS ERROR CODE 5 + 4. P...
Page 46 - CONTINUED
Page 46 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION LOW FLAME SIGNAL (Does not affect control operation) STATUS ERROR CODE 1 + 2. FLAME SIGNAL ABOVE ( u 1.40 microamps) NO YES CONTINUED ON NEXT PAGE YES SINGLE−STAGE THERMOSTAT MODE (DIP SWITCH SET AT SING...
Page 48 - Troubleshooting: Cooling Sequence of Operation; COOLING SEQUENCE OF OPERATION
Page 48 Troubleshooting: Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION SIGNAL POLARITY REVERSED. CONTROL WILL CONTINUE TO CALL FOR COOLING IN THIS CONDITION. STATUS ERROR CODE 5 + 4. POWER ON YES IS POLARITY REVERSED? THERMOSTAT CALLS FOR FIRST−STAGE COOL. COMPRESSOR AND CONDENSER FAN ...
Page 49 - Troubleshooting: Continuous Fan Sequence of Operation; CONTINUOUS LOW SPEED FAN SEQUENCE OF OPERATION
Page 49 Troubleshooting: Continuous Fan Sequence of Operation CONTINUOUS LOW SPEED FAN SEQUENCE OF OPERATION MANUAL FAN SELECTION MADE AT THERMOSTAT. AFTER 2 SECOND DELAY, INDOOR BLOWER IS ENERGIZED ON CONTINUOUS FAN SPEED. THERMOSTAT CALLS FOR FIRST−STAGE HEAT. THERMOSTAT CALLS FOR FIRST STAGE COOL...
Page 50 - Start−Up & Performance Check List; Gas Supply Pressure; Line Voltage; Filter; upflow furnace shown
Page 50 Start−Up & Performance Check List Unit Model Number_______________ Serial Number___________________ UNIT SET UP (typical) Gas Supply Pressure 1 2 2 1 SUPPLY AIR Line Voltage 3 4 5 Filter RETURN AIR RETURN AIR GAS SUPPLY Natural Gas LP/Propane Gas Piping Connections Tight Leak Tested Supp...
Page 51 - Combustion CO; Temperatures
Page 51 Contractor’s: Name_________________________Telephone_____________Checklist Completed____________________ Job Address_____−________________________________Technician’s Name___________________________________ UNIT OPERATION (typical) 1 HEATING MODE GAS MANIFOLD PRESSURE W.C._____ COMBUSTION SA...
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