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Hersteller: Lennox International Inc. Dateigröße: 2.2 mb Dateiname: Unterrichtssprache:

Removing the Bottom Panel Screw \/ Bottom Cap Bottom FIGURE 9 Leveling an Upflow Unit When the side return air inlets are used in an upflow application, it may be necessary to install leveling bolts on the bottom of the furnace. Use field-supplied corrosion-resistant 5/16 inch machine bolts (4) and nuts (8), See figure 10. NOTE -The maximum length of the bolt is 1-1/2 inches. 1 -Lie the furnace on its back and drill a 5/16 inch diameter hole in each corner of the furnace's bottom. See figure 10 for the correct location of the holes, Drill through the bottom panel and the bottom flange of the cabinet, 2 -Install one bolt and two nuts into each hole. Screw the first nut onto a bolt and then insert the bolt into a hole, A fiat washer may be added between the nut and the bottom of the unit, 3 -Screw another nut onto the bolt on the inside of the furnace base. A flat washer may be added between the nut and the bottom of the unit, 4 -Adjust the outside nut to the appropriate height and tighten the inside nut to secure the arrangement, Leveling Bolt Installation Inches (mm) 3/8 (10)_r Furnace Front 3/8 _'1 [ 1-3/4 (44) 1-3/4 (44) Leveling Bolt Locations Furnace Bottom 3/8 Leveling Bolt (10) Locati_ 3/8 1-3/4 (10) (44) I-3/4 (44) FIGURE 10 Horizontal Applications The G50UH(X) furnace can be installed in horizontal applications, Allow for clearances to combustible materials as indicated on the unit nameplate, Minimum clearances for closet or alcove installations are shown in figure 11, Horizontal Application Installation Clearances Top Left End Right End Bottom Vent Connector Type C Type B1 Type Top 0 0 *Front 3 in. (76 ram) 3 in. (76 ram) Back0 0 Ends 2 in. (51 ram) 2 in. (51 ram) Vent 6 in. (152 ram) 1 in. (25 ram) Floor o:_ o:_ *Front clearance in alcove installation must be 24 in. (610 ram). Maintain a minimum of 24 in. (610 ram) for front service access. _:For installations on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring. FIGURE 11 Page 10 Thisfurnacemaybeinstalledineitheranatticoracrawlspace. Eithersuspendthefurnacefromroofraftersor floorjoists,asshowninfigure12,orinstallthefurnaceon a platform,asshownin figure13.Theunitmustbesupportedat bothendsandbeneaththeblowerdecktopreventsagging. Typical Horizontal Application Unit Suspended in Attic or Crawlspace Leave sufficient clearance between rod and unit to remove access panel. 1/4 i ANGLE IRON U-CHANNELS FIGURE 12 NOTE -Heavy-gauge perforated sheet metal straps (plumbers' straps) may be used to suspend the unit from roof rafters or ceiling joists. When straps are used to suspend the unit in this way, support must be providedfor both the ends and the middle of the furnace to prevent sagging. The straps must not interfere with the plenum or exhaust piping instaflation. Securing screws should be 1/2 inch from the top edge and 1-1/2 inch from the side edge in aft cases. Cooling coils and supply and return air plenums must be supported separately. NOTE -When the furnace is installed on a platform in a crawlspace, it must be elevated enough to avoid water damage and to allow the evaporator coil to drain. Return Air --Horizontal Applications Return air can be brought in through the end of a furnace installed in a horizontal application, The furnace is equipped with a removable bottom panel to facilitate installation, See figure 9, Horizontal Application Unit Installed on Platform NOTE -Line contact is permissible. See the unit nameplate for clearances. \ \ \ GAS ENTRY __VENT PIPE WORKING PLATFORM FIGURE 13 -&WARNING &WARNING Page 11 Thisunitisnotequippedwithafilteror rack.A field-providedhigh- velocityfilterisrequiredfortheunittooperate properly.Table1listsrecommended filtersizes. Afiltermustbein placeanytimetheunitisoperating. TABLE 1 Filter Size Cabinet Size Furnace Side Return Bottom Return 14-1/2" 16X25X 1 (1) 14X25X1 (1) 17-112" 16X25X 1 (1) 16X25X1 (1) 21" 16X25X 1 (1) 20X25X 1 (1) 24-1/2" 16X25X 1(2) 24X25X 1(1) Use industry-approved standards to size and install the supply and return air duct system. This will result in a quiet and low-static system that has uniform air distribution. NOTE -Do not operate the furnace with an external static pressure that exceeds 0,5 inches w,c, Higher external static pressures may cause erratic limit operation, Supply Air Plenum If the furnace is installed without a cooling coil, a removable access panel must be installed in the supply air duct, The access panel should be large enough to permit inspection (either by smoke or reflected light) of the heat exchanger for leaks after the furnace is installed, The furnace access panel must always be in place when the furnace is operating and it must not allow leaks into the supply air duct system, Return Air Plenum Return air must not be drawn from a room where this furnace, or any other gas appliance (ie., a water heater), is installed. When return air is drawn from a room, a negative pressure is cr...

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