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INSTALLATION
INSTRUCTIONS
2011 Lennox Industries Inc.
Dallas, Texas, USA
SL280DFV
®
DAVE LENNOX SIGNATURE
COLLECTION GAS FURNACE
DOWNFLOW AIR DISCHARGE
506710−01
06/2011
Litho U.S.A.
Supersedes 01/2011
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
WARNING
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 installer (or
equival
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Unit Dimensions − inches (mm) 3 −1/8 9/16 (79) (14) D RETURN AIR OPENING B FLUE OUTLET 19 −7/16 9/16 (Top) (494) (14) 9/16 (14) TOP VIEW 27 −3/4 1 −1/2 (38) A (7705) Front Panel 9/16 19 −7/16 9/16 B (14) (494) (14) ELECTRICAL INLET (Either Side) 33 (838) 5 −3/8 (137) Right GAS PIPING INLET 2 −1/8 (54) Left (Either Side) 6 −5/8 (168) Right 7 −1/8 (181) Left Supply 19 −1/4 Supply 3/4 C (489) Air (19) Air FRONT VIEW SIDE VIEW A B C D Model No. in. mm in. mm in. mm in. mm SL280DF070V36A 14−1/2 368 1
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Parts Arrangement BLOWER ASSEMBLY SECONDARY LIMIT GASKET FLUE CHASE CONTROL BOX (Includes two−stage integrated control, transformer and circuit breaker) INTERNAL FLUE PIPE ASSEMBLY DOOR INTERLOCK SWITCH PRIMARY LIMIT LOCATION ROLLOUT SWITCH HEAT EXCHANGER COMBUSTION AIR INDUCER PRESSURE SWITCHES COMBUSTION AIR INDUCER GAS VALVE INNER BLOWER ACCESS PANEL BURNER BOX ASSEMBLY ACCESS PANEL FIGURE 1 Page 3
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SL280DFV Gas Furnace CAUTION The SL280DFV gas furnace is equipped with a two−stage, As with any mechanical equipment, personal injury can result from contact with sharp sheet metal variable speed integrated control. the control is compat- edges. Be careful when you handle this equipment. ible with: ® Communicating thermostats − icomfort Touch . Certifications Non−communicating thermostats − ComfortSense or oth- SL280DFV units are CSA International certified. er conventional thermostats. In the U
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chilled air from entering the furnace (see figure 1). If the SL280DFV units may be used for heating of buildings or damper is manually operated, it must be equipped to pre- structures under construction, if the following conditions vent operation of either the heating or the cooling unit, un- are met: less it is in the full HEAT or COOL setting. The vent system must be permanently installed per these installation instructions. A room thermostat must control the furnace. The use of fixed jump
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The gas cock must be T handle" type. When a furnace is installed in an attic, the passage- CAUTION way to and service area surrounding the equipment Insufficient combustion air can cause headaches, shall be floored. nausea, dizziness or asphyxiation. It will also cause excess water in the heat exchanger resulting in rust- ing and premature heat exchanger failure. Excessive exposure to contaminated combustion air will result in safety and performance related problems. Avoid WARNING exposure
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Confined Space Air from Inside If the confined space that houses the furnace adjoins a A confined space is an area with a volume less than 50 cu- space categorized as unconfined, air can be brought in by 3 bic feet (1.42 m ) per 1,000 Btu (.29 kW) per hour of the providing two permanent openings between the two combined input rating of all appliances installed in that spaces. Each opening must have a minimum free area of 1 space. This definition includes furnace closets or small 2 square inch (6
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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 AIR WATER FURNACE HEATER INLET VENTILATION AIR 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 2 mm ) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure. FIGURE 3 EQUIPMENT IN CONFINED SPACE E
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Downflow Installation CAUTION Downflow unit installs in three ways: on non−combustible The furnace and downflow combustible flooring flooring, on combustible flooring using a downflow com- base shall not be installed directly on carpeting, tile, bustible flooring base, or on a reverse−flow cooling cabinet. or other combustible material other than wood floor- Do not drag the unit across the floor. ing. Installation on Non−Combustible Flooring (Figure 6) 1 − Cut floor opening keeping in mind clea
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Setting Equipment SL280DFV UNIT WARNING Do not install the furnace on its front, back or in the horizontal position. See figure 12. Do not connect the return air ducts to the back of the furnace. Doing so COOLING COIL will adversely affect the operation of the safety con- trol devices, which could result in personal injury or PROPERLY death. PLENUM SIZED FLOOR OPENING Install the SL280DFV gas furnace as shipped in the downflow position only. Do not install the furnace hori- zontally. Select a lo
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Horizontal Front Back FIGURE 12 Downflow Application Allow for clearances to combustible materials as indi- WARNING cated on the unit nameplate. Minimum clearances for Improper installation of the furnace can result in per- closet or alcove installations are shown in figure 13. sonal injury or death. Combustion and flue products must never be allowed to enter the return air system Downflow Application Installation Clearances or the living space. Use screws and joint tape to seal Top the return a
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Refer to the tables and the venting information contained in Duct System these instructions to properly size and install the venting Use industry-approved standards (such as those pub- system. lished by Air Conditioning Contractors of America or Ameri- can Society of Heating, Refrigerating and Air Conditioning IMPORTANT Engineers) to size and install the supply and return air duct system. This will result in a quiet and low-static system that Once the venting system is installed, attach the Dis
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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. VENT CONNECTOR OTHER PERMANENTLY APPLIANCE SEALED FIREPLACE OPENING FURNACE FIGURE 15 Venting Using a Masonry Chimney DO NOT insulate
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Never connect a Category I appliance to a chimney that is TABLE 4 servicing a solid−fuel appliance. If a fireplace chimney flue Maximum Horizontal Connector Diameter is used to vent this appliance, the fireplace opening must Connector Length feet (m) inches (mm) be permanently sealed. 3 (76) 4−1/2 (1.37) A type B or listed chimney lining system that passes 4 (102) 6 (1.83) through an unused masonry chimney flue is not considered 5 (127) 7−1/2 (2.29) to be exposed to the outdoors. 6 (152) 9
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18 − The common vent diameter must always be at least as 21 − When connecting this appliance to an existing dedi- large as the largest vent connector diameter. cated or common venting system, you must inspect the 19 − In no case, shall the vent connector be sized more than venting system’s general condition and look for signs two consecutive table size diameters over the size of of corrosion. The existing vent pipe size must conform the draft hood outlet or flue collar outlet. to these instructi
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TABLE 6 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 H L Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) MIN MAX MIN MAX MIN MAX MIN MAX 0 38 77 59 151 85 249 126 373 2 39 51 60 96 85 156 123 231 6 4 NR NR 74 92 102 152 146 225 6 NR NR 83 89 114 147 163 220 0 37 83 58 164 83 273 123 412 2 39 56 59 108 83 176 121 261 8 5 NR NR 77 102
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TABLE 7 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 H R Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) MIN MAX MIN MAX MIN MAX MIN MAX 1 22 37 35 66 46 106 58 164 2 23 41 37 75 48 121 60 183 6 3 24 44 38 81 49 132 62 199 1 22 40 35 72 49 114 64 176 2 23 44 36 80 51 128 66 195 8 3 24 47 37 87 53 139 67
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TABLE 9 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 H L Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) MIN MAX MIN MAX MIN MAX MIN MAX 1 NR NR NR NR NR NR NR NR 2 NR NR NR NR NR NR 168 182 6 3 NR NR NR NR 121 131 175 198 1 NR NR NR NR NR NA NR NR 2 NR NR NR NR 125 126 184 193 8 3 NR NR NR NR 130 138 191 208 1 NR NR
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Removal of the Furnace from Common Vent 7 − If a venting problem is found during any of the preced- ing tests, the common venting system must be modi- In the event that an existing furnace is removed from a fied to correct the problem. venting system commonly run with separate gas ap- pliances, the venting system is likely to be too large to Resize the common venting system to the minimum properly vent the remaining attached appliances. vent pipe size determined by using the appropriate Conduct
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TABLE 11 3 3 Gas Pipe Capacity − ft /hr (m /hr) Nominal Length of Pipe − feet (m) Internal Iron Pipe Diameter Size inches 10 20 30 40 50 60 70 80 90 100 inches (mm) (3.048) (6.096) (9.144) (12.192) (15.240) (18.288) (21.336) (24.384) (27.432) (30.480) (mm) 1/2 .622 175 120 97 82 73 66 61 57 53 50 (12.7) (17.799) (4.96) (3.40) (2.75) (2.32) (2.07) (1.87) (1.73) (1.61) (1.50) (1.42) 3/4 .824 360 250 200 170 151 138 125 118 110 103 (19.05) (20.930) (10.19) (7.08) (5.66) (4.81) (4.28) (3.91) (3.54)
