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Disposable, low-velocity filters may be used to replace washable, high-velocity filters, providing they are sized for 300 FPM or less. • The furnaces with 1600 or less CFM rating use a 16" x 25" high-velocity filter. On these models the filter may be mounted internally for bottom return or a filter and rack may be mounted externally for bottom return. • The furnaces with greater than 1600 CFM require that both (left and right) side returns are used. Two side return filters and racks are required. Filter racks must be mounted externally. See Figure 24. • If return air must be on one side only, an optional 20" x 25" filter standoff rack kit can be used. (See Figure 22.) For bottom return, a n internal filter can be used or a filter rack kit can be mounted externally. I • See pages 40 & 46, CirculatorAirBIowerData for additional data. NOTE: The 20" x 25" standoff side filter rack gives more filter area but does not provide more air. See Figure 22. To achieve 2000 CFM 2 side returns are still needed. See Figure 24. NOTE: Disposable low-velocity filters may be replaced with washable, high-velocity filters. Washable, high-velocity filters can be replaced ONLY with same type and size filter unless low-veloc ity filters meet the minimum size areas for 300 FPM or less. Optional Duct Standoff 20 x 25 Optional Filter Rack 25-23-05-4 Filter Optional Filter Rack Installation: Side Return Center the filter rack on the side panel, flush with the bottom edge of the furnace. Mark the fastening holes. Drill the fastening holes in the side panel and fasten the filter rack in place with sheet metal screws. See Figure 23 and Figure 24. iiiiii.i .i.i.i.i.iiiii!iii.iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii;ii;ii;ii;ii i_.I.!iii.ii Side Return Filter Rack Filter 25-23-05-4a iiiiiiiiiii .iiiiiiiiiiiiiiiiii!!ili;i!i!!!!!!!i!! i!iiiiiiiii;i i_ Filters Installed on Two Sides Using Two Filter Racks 25-23-05-3 Filter Filter Internal Filter in Bottom-Return Installation When installing a bottom-mounted filter inside the furnace, install the filter clips on the edge of the bottom duct opening with the wider end of the clips toward the blower, as shown in Figure 25. Clips may be obtained from your distributor or fabricated from sheet metal (Figure 26). Insert filter into side clips first and push filter back until it is fully engaged into back clip. Bottom Mounted Filter Center Clip sideto 25-24-18-1 11/4" 26 Ga, Galvanized Steel NOTE: If filters are only suitable for heating application, advise homeowner that filter size may need to be increased if air conditioning is added. Addition Of Air Conditioning When a refrigeration coil is used in conjunction with this furnace, it must be installed on the discharge side of the furnace to avoid condensation in the heat exchanger. The coil installation instructions must be consulted for proper coil location and installation procedures. With a parallel flow arrangement, dampers must be installed to prevent chilled air from entering the furnace. Ifmanual ly operated dampers are used, they must be equipped with a means to prevent operation of either unit unless the damper is in full heat or full cool position. Copper or plastic tubing may be used for the condensate drain line. 441 O1 261302 11. Ductwork and Filter (Downflow) CARBON MONOXIDE POISONING HAZARD. Failure to properly seal duct could result in death or personal injury. Do NOT draw return air from inside a closet or utility room where furnace is located. Return air duct MUST be sealed to furnace casing. FIRE HAZARD. Failure to connect the return air duct to the downdlow furnace could result in death, injury, and/or property damage. Side return air duct(s) may cause excessive and/or air temperatures, which could result bodily injury, and/or property damage. top ofa bodily furnace in death, Return air duct is to be connected to only the top of downflow furnace. BURN HAZARD. The vent may be hot. Failure to install vent shield properly could result in personal injury. Install VENT PIPE SHIELD NAHAOO2VC as described below. Vent Shield Vent shield is required for all downflowinstallations. The vent Must exit out the side of the furnace for all downflow installations. This places the hot vent pipe (over 300 ° F) within reach of children. Vent shield attaches to side of furnace to cover vent pipe. See Figure 5 in "2, Installation"section. FIRE HAZARD. Failure to install furnace on noncombustible subbase could result in death, personal injury and/or property damage. Place furnace on noncombustible subbase on downflow applications, unless installing on non-combustible flooring. Outlet Duct Flange Downflow installations with cased coils require the furnace outlet duct flange to be bent outward and flat to mate the outlet of the furnace to the cased coil. Sub-Bases for Combustible Floors -Furnace Only Note: When using the subbase for combustible floors, the discharge air duct flanges on the furnace MUST be broken down to provide proper fit up to the subbase. Us...

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