Lennox EL280UH Installation Instructions Manual

Elite series gas furnace upflow / horizontal air discharge

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User's information manual (7 pages)

Installation instructions manual (38 pages)

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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS E 2012 Lennox Industries Inc. Dallas, Texas, USA EL280UH ® ELITE SERIES GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE 506894−01 02/2012 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.
Page 2: Unit Dimensions
AIR FLOW 1−15/16 (49) (19) (16) 3−1/4 23−1/2 (83) (19) (597) Bottom Return Bottom Return Air Opening Air Opening FRONT VIEW SIDE VIEW EL280UH Model No. 070P24A 14−1/2 13−3/8 4−3/4 070(X)P36A 090P36B 17−1/2 16−3/8 6−1/4 090(X)P48B 110P48C 19−7/8 19−1/2 110(X)P60C 135P60D 24−1/2...
Page 3: Parts Arrangement
Parts Arrangement Make Up Box Heat Exchanger Combustion Air Inducer Combustion Air Pressure Switch Gas Valve and Manifold Assembly Collector Box Indoor Blower and Motor Assembly (installed in cabinet) Limit Switch (under collector box) Transformer Door Interlock Switch Integrated Control Indoor Blower and Motor Assembly (removed from cabinet) FIGURE 1...
Page 4: El280Uh Gas Furnace
EL280UH Gas Furnace CAUTION The EL280UH unit is shipped ready for installation in the As with any mechanical equipment, personal injury upflow or horizontal right position (for horizontal left posi- can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.
Page 5: Use Of Furnace As A Construction Heater
Use of Furnace as Construction Heater See figure 2. With a parallel flow arrangement, a damper (or Lennox does not recommend the use of EL280UH units as other means to control the flow of air) must adequately pre- a construction heater during any phase of construction.
Page 6: Combustion, Dilution & Ventilation Air
The requirements for providing air for combustion and ven- this section to install EL280UH furnaces to ensure efficient tilation depend largely on whether the furnace is installed in and safe operation. You must consider combustion air needs and requirements for exhaust vents and gas piping.
Page 7 Unconfined Space Air from Inside An unconfined space is an area such as a basement or If the confined space that houses the furnace adjoins a large equipment room with a volume greater than 50 cubic space categorized as unconfined, air can be brought in by feet (1.42 m ) per 1,000 Btu (.29 kW) per hour of the com- providing two permanent openings between the two...
Page 8 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE (Inlet Air from Crawlspace and Outlet Air to Ventilated Attic) CHIMNEY OR GAS VENT VENTILATION LOUVERS (Each end of attic) OUTLET WATER FURNACE HEATER INLET 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 (645 ) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.
Page 9: Setting Equipment
Doing so will adversely affect the operation of the safety control devices, which could result in per- sonal injury or death. The EL280UH gas furnace can be installed as shipped in either the upflow position or the horizontal position. Left Side...
Page 10 Return Air −− Upflow Applications Single Side Return Air Return air can be brought in through the bottom or either (with transition and filter) 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.
Page 11 Removing the Bottom Panel Horizontal Applications Remove the two screws that secure the bottom cap to the The EL280UH furnace can be installed in horizontal ap- furnace. Pivot the bottom cap down to release the bottom plications. Order horizontal suspension kit (51W10) from panel.
Page 12: Filters
TABLE 1 Horizontal Application Unit Installed on Platform Filter Size Furnace Line contact is permissible but not preferred Cabinet Width Side Return Bottom Return See the unit nameplate for clearances. A − 14−1/2" 16 X 25 X 1 (1) 14 X 25 X 1 (1) B −...
Page 13: Venting
If necessary reposition the combustion air inducer, pres- Venting sure switch and or make up box as needed per the follow- ing steps and see figures 17 through 22. A 4−inch diameter flue transition is factory-installed on the combustion air inducer outlet of all models. Figure 16 1 −...
Page 14 Horizontal Position HORIZONTAL RIGHT POSITION HORIZONTAL LEFT POSITION Top Vent Discharge Top Vent Discharge Vent Pipe Vent Pipe Pressure Switch Pressure Switch Flue Transition Cover Plate Flue Transition FLOW FLOW Collector Box Cover Plate Collector Box Make−Up Box Make−Up Box Disconnect pressure switch hose from barbed fitting on the pres- Gas supply piping must be brought into the unit from the bottom sure switch assembly.
Page 15 The EL280UH is not approved for use with horizontal venting. An exterior masonry chimney that is not tile−lined must be lined with B1 vent or a listed insulated flexible metal vent.
Page 16 CHIMNEY WITH suitable materials, or replaced with a gas vent or chimney METAL LINER suitable for venting EL280UH series units. The chimney VENT CONNECTOR passageway must be checked periodically to ensure that it is clear and free of obstructions. 4 in. (102 mm)
Page 17 Common Venting Using Tile−Lined Interior Masonry Chimney and Combined Vent Connector MINIMUM LENGTH = AS SHORT AS PRACTICAL. INTERIOR TILE−LINED FOR MAXIMUM LENGTH SEE NOTE TO LEFT MASONRY CHIMNEY NOTE− Refer to provided venting tables for installations. NOTE − the chimney must be properly sized per provided venting tables or lined with listed metal lining system.
Page 18 16 − Vent connectors serving Category I appliances shall two consecutive table size diameters over the size of not be connected to any portion of mechanical draft the draft hood outlet or flue collar outlet. systems operating under positive pressure such as 20 −...
Page 19 TABLE 4 Capacity of Type B Double−Wall Vents with Single−Wall Metal Connectors Serving a Single Category I Appliance Vent and Connector Diameter − D (inches) Height Lateral 3 Inch 4 Inch 5 Inch 6 Inch Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) NOTE −...
Page 20 TABLE 5 Vent Connector Capacity Type B Double−Wall Vents with Type B Double−Wall Connectors Serving Two or More Category I Appliances Vent and Connector Diameter − D (inches) Vent Connector 3 Inch 4 Inch 5 Inch 6 Inch Height Rise Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet)
Page 21 TABLE 7 Vent Connector Capacity Type B Double−Wall Vents with Single−Wall Metal Connectors Serving Two or More Category I Appliances Vent and Connector Diameter − D (inches) Height Lateral 3 Inch 4 Inch 5 Inch 6 Inch Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) NOTE −...
Page 22 Removal of the Furnace from Common Vent 3 − Close all building doors and windows and all doors be- tween the space in which the appliances remaining In the event that an existing furnace is removed from a connected to the common venting system are located venting system commonly run with separate gas ap- and other spaces of the building.
Page 23: Gas Piping
4 − The piping should be sloped 1/4 inch (6.4 mm) per 15 Gas Piping feet (4.57 m) upward toward the meter from the fur- Gas supply piping should not allow more than 0.5"W.C. drop nace. The piping must be supported at proper intervals in pressure between gas meter and unit.
Page 24 Left Side Piping MANUAL (Standard) MAIN SHUT−OFF AUTOMATIC MANUAL VALVE GAS VALVE MAIN SHUT−OFF (With 1/8 in. NPT AUTOMATIC VALVE Plugged Tap GAS VALVE (With 1/8 in. NPT Shown) Plugged Tap Shown) GROUND JOINT UNION GROUND JOINT UNION DRIP LEG Right Side Piping FIELD (Alternate)
Page 25: Electrical
Leak Check The unit is equipped with a field make−up box on the left hand side of the cabinet. The make−up box may be moved After gas piping is completed, carefully check all piping to the right side of the furnace to facilitate installation. If the connections (factory−...
Page 26 One line voltage HUM" 1/4" spade terminal is provided on 3 − When the EL280UH is operating in the low cool or the the furnace integrated control. See figure 33 for integrated high cool cooling mode, the indoor blower will run on the corresponding cooling speed.
Page 27 TABLE 10 Field Wiring Applications DIP Switch Settings and On−Board Links (See figure 33) W915 Thermostat Wiring Connections Two−Stage W951 DIP Switch 1 Cooling Heat Pumps 1 Heat / 1 Cool Intact Intact CONTROL OUTDOOR T’STAT TERM. STRIP UNIT NOTE − Use DIP switch 2 to set sec- ond−stage heat ON delay.
Page 28 TABLE 10 Field Wiring Applications (Continued) DIP Switch Settings and On−Board Links (See figure 33) W915 Thermostat Wiring Connections Two−Stage W951 DIP Switch 1 Cooling Heat Pumps 2 Heat / 2 Cool Intact CONTROL OUTDOOR T’STAT TERM. STRIP UNIT 2 Heat / 1 Cool Intact Intact CONTROL...
Page 29 EL280UH SCHEMATIC WIRING DIAGRAM 070P24A BLACK YELLOW BROWN 070P36A BLACK YELLOW BROWN 090P36B BLACK BROWN YELLOW 090P48B BLACK YELLOW BROWN 110P48C BLACK BROWN YELLOW 110P60C BROWN YELLOW BLACK 135P60D BROWN YELLOW BLACK 070XP36A BLACK YELLOW BROWN 090XP48B BLACK YELLOW BROWN...
Page 30 TYPICAL EL280UH FIELD WIRING DIAGRAM FIGURE 32 TWO−STAGE INTEGRATED CONTROL 1/4" QUICK CONNECT TERMINALS SENSE = 120 VAC OUTPUT TO FLAME SENSOR NEUTRALS= 120 VAC NEUTRAL PARK = DEAD TERMINAL FOR UNUSED BLOWER LEAD HEAT LOW = 120 VAC OUTPUT TO CIRC BLWR −− LOW HT SPEED HEAT HIGH/ COOL LOW = 120 VAC OUTPUT TO CIRC BLWR −−...
Page 31: Integrated Control
The unit is shipped from the factory with a heating blower−off delay of 90 seconds. The heating blower off EL280UH units are equipped with a two−stage integrated delay affects comfort and is adjustable to satisfy individual control. This control manages ignition timing and fan off delays based on selections made using the control DIP applications.
Page 32: Unit Start−Up
11− Set the thermostat to desired setting. The gas valve on the EL280UH unit will be equipped with a NOTE − When unit is initially started, steps 1 through 11 gas control switch. Use only your hand to move the switch.
Page 33: Gas Pressure Adjustment
Table 13 shows acceptable combustion for ALL more accurate time.) Divide by two and compare to time EL280UH models. The maximum carbon monoxide in table 12 below. If manifold pressure matches table 14 reading should not exceed 50 ppm...
Page 34 TABLE 14 Manifold Pressure Settings at all Altitudes Manifold Manifold Manifold Supply Line Pressure in.wg. Pressure in.wg. Pressure in.wg. Pressure Unit 0−4500 ft. 4501−7500 ft. 7501 − 10,000 ft. in. w.g. Input Low Fire High Fire Low Fire High Fire Low Fire High Fire Natural...
Page 35: Other Unit Adjustments
Other Unit Adjustments HEAT FAN-OFF TIME IN SECONDS Primary and Secondary Limits 60sec. 90sec. The primary limit is located on the heating compartment vestibule panel. The secondary limits (if equipped) are lo- cated in the blower compartment, attached to the back side of the blower.
Page 36: Sequence Of Operation
Single−Stage Thermostat, Two Stage Heat. Dip Heating Sequence of Operation Switch set at SINGLE" When there is a call for heat, the integrated control runs a 1− SureLight control energizes combustion air inducer B6 self check. The control checks for S10 primary limit, S21 on low heat speed.
Page 37: Blower Performance Data
BLOWER DATA EL280UH070P24A PERFORMANCE (Less Filter) EL280UH090P48B PERFORMANCE (Less Filter) External Air Volume / Watts at Various Blower Speeds Air Volume / Watts at Various Blower Speeds External Static Medium- Medium- High Medium Static High Pressure High Pressure Watts Watts Watts in.
Page 38 BLOWER DATA EL280UH110P60C PERFORMANCE (Less Filter) Air Volume / Watts at Different Blower Speeds Bottom Return Air, Side Return Air with Optional Return Single Side Return Air − Air volumes in bold require field External Air Base, Return Air from Both Sides or Return Air from fabricated transition to accommodate 20 x 25 x 1 in.
Page 39: Service
OR EXPLOSION HAZARD. Filters Failure to follow safety warnings exactly could result All EL280UH filters are installed external to the unit. Filters in dangerous operation, serious injury, death or should be inspected monthly. Clean or replace the filters property damage.
Page 40 Carefully remove the combustion air inducer to avoid Remove NOX insert. See figure 37. damaging blower gasket. If gasket is damaged, it must be replaced to prevent leakage. EL280UH BURNER, COMBUSTION AIR INDUCER ASSEMBLY & HEAT EXCHANGER REMOVAL gasket pressure switch...
Page 41 17 −Reinstall burner box, manifold assembly and burner box FIGURE 38 cover. 18 −Reconnect all wires. EL280UH NOx INSERTS 19 −Reconnect top cap and vent pipe to combustion air in- ducer outlet. 20 −Reconnect gas supply piping. 21 −Turn on power and gas supply to unit.
Page 42: Planned Service
Repair Parts List The following repair parts are available through independent Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA International nameplate −− Example: EL280UH070P24A−01. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier.
Page 43: Integrated Control Diagnostic Codes
Integrated Control Diagnostic Codes FLASH CODE STATUS / ERROR DESCRIPTION (X + Y) 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. LED flashes X times at 2Hz, remains off for two seconds, flashes Y times at 2Hz, remains off for four X + Y seconds, then repeats.
Page 44: Troubleshooting
Troubleshooting: Heating Sequence of Operation HEATING SEQUENCE OF OPERATION NORMAL AND ABNORMAL HEATING MODE POWER ON GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF. (RESET CONTROL BY CONTROL SELF−CHECK OKAY? TURNING MAIN POWER OFF.) POLARITY REVERSED. POLARITY OKAY? STATUS ERROR CODE 5 + 4.
Page 45 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT STATUS LED − HEARTBEAT. (Refer to box A on previous page) GAS VALVE OFF. COMBUSTION AIR INDUCER FIRST−STAGE (LOW FIRE) PRESSURE OFF. INDOOR BLOWER OFF. UNIT WILL RETRY SWITCH CLOSED WITHIN 2.0 MINUTES? AFTER 5−MINUTE WAIT PERIOD.
Page 46 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT. STATUS LED −− HEARTBEAT. SEE BOX A. FLAME SIGNAL ABOVE (u1.40 microamps) LOW FLAME SIGNAL (Does not affect control operation) STATUS ERROR CODE 1 + 2. SINGLE−STAGE THERMOSTAT MODE TWO STAGE THERMOSTAT MODE (DIP SWITCH SET AT SINGLE")
Page 47 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION CONTINUED SEE BOX A NORMAL OPERATION. SEE BOX B THERMOSTAT CALLS FOR HEAT. RETURN TO FIRST−STAGE HEAT MODE. FIRST−STAGE CONTINUES UNTIL SECOND− STAGE PRESSURE SWITCH CAN BE PROVEN SECOND−STAGE (HIGH FIRE) HEAT or HEAT DEMAND IS SATISFIED.
Page 48: Troubleshooting: Cooling Sequence Of Operation
Troubleshooting: Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION POWER ON SIGNAL POLARITY REVERSED. CONTROL WILL CONTINUE TO CALL FOR COOLING IS POLARITY REVERSED? IN THIS CONDITION. STATUS ERROR CODE 5 + 4. SIGNAL IMPROPER GROUND AT LED. CONTROL WILL CONTINUE TO CALL FOR COOLING IS THERE IN THIS CONDITION.
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 COOL. THERMOSTAT CALLS FOR FIRST−STAGE HEAT. INDOOR BLOWER RAMPS TO FIRST STAGE AFTER 45−SECOND DELAY, INDOOR BLOWER COOLING SPEED AFTER A 2−SECOND DELAY.
Page 50 Start−Up & Performance Check List UNIT SET UP (typical) Unit Model Number_______________ Serial Number___________________ SUPPLY Line Voltage upflow furnace shown Gas Supply Pressure Filter RETURN RETURN DUCT SYSTEM GAS SUPPLY SUPPLY AIR DUCT LP/Propane Gas Natural Gas Sealed Piping Connections Tight Insulated (if necessary) Leak Tested Registers Open and Unobstructed...
Page 51 UNIT OPERATION (typical) Combustion CO SUPPLY Thermostat Gas Manifold Pressure Temperatures upflow furnace shown Filter Blower Motor Amps Duct Static RETURN RETURN COOLING MODE HEATING MODE INDOOR BLOWER AMPS______ GAS MANIFOLD PRESSURE W.C._____ TEMPERATURE DROP COMBUSTION SAMPLE CO CO PPM_______ ______ Return Duct Temperature _________ Supply Duct Temperature...

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