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Fabricant : Sears Taille : 2.69 mb Nom Fichier : Langue d'enseignement:

Use duct pliers to bend the duct flanges flat onto the furnace casing. DO NOT bend the duct flanges inward (toward the heat exchangers) as air flow restrictions may occur. The Subbase for Combustible Floors MUST be used when a downflow furnace is set on a combustible floor, even when the furnace is installed on a coil box. Cut the opening in the floor according to the dimensions in Table 5 because the base is equipped with locating tabs that center the base over the opening. The opening in the base is 11/4" shorter and 11/8" narrower than the minimum required size of the opening in the floor. This is done to maintain a 1" clearance between the floor and the plenum. 2. Fabricate the plenum to the dimensions given in Table 5. Note that the dimensions given are outside dimensions. 3. Set the base over the opening in the floor, centering the opening in the base over the opening in the floor. Fasten the base to the floor with screws or nails. See Figure 27 and Figure 28. Drop the plenum through the opening in the base. The flange of the plenum should rest on top of the combustible floor base. ] Sub-bases for Combustible Floors Dimensions Sub-base Combustible for Floors Sub-base Floor for Combustible Dimensions Opening In Floor Opening In Base For Plenum Typical Plenum Dimensions Part Number H" J* K** L M N P R Subbase for Furnace Only NAHHO01 SB 1511/16 283/4 149/16 18 181/4 145/8 15 131/2 15 131/2 NAHHOO2SB 195/16 283/4 183/16 18 181/4 181/4 15 171/8 15 171/8 NAHHOO3SB 2215/16 283/4 2113/16 16 161/4 21 _/8 15 193/4 15 193/4 Subbase for Coil Box NAHHOO4SB 1511/16 209/16 149/16 16 161/4 145/8 15 131/2 15 131/2 NAHHOOSSB 19s/16 209/16 183/16 16 181/4 181/4 15 171/8 15 171/8 NAHHOO6SB 2215/16 209/16 2113/16 16 161/4 211/8 15 193/4 15 193/4 Outside Dimension "* Base Spacer Side To Side 441 01 261302 Exploded View of Sub-Base for Exploded View of Base for Furnace ONLY Downflow Cased Coil I tr Combustible FloorBase Setting the Base .i!i i.i Subbase Furnac_ Insulation / _. % _W_°°d Fl°°r Wood Screw Sub-base for Combustible Floors -Downflow Coil Adapter Box The subbase for combustible floors is required when a downflow furnace, used with a downflowcoilbox, is set on combustible flooring. 1, Cut the opening in the floor according to the dimensions in Table 5 because the base is equipped with locating tabs that center the base over the opening. The opening in the base is 11/4 "shorter and 11/8 " narrower than the minimum required size of the opening in the floor. This is done to maintain a 1" clearance between the floor and the plenum. 2. Fabricate the plenum to the dimensions given in Table 5. Note that the dimensions given are outside dimensions. 3. Set the base over the opening in the floor, centering the opening in the base over the opening in the floor. Fasten the base to the floor with screws or nails. See Figure 29 and Figure 30. Drop the plenum through the opening in the base. The flange of the plenum should rest on top of the combustible floor base. Combustible Floor Base 25-21-46b iiiiiiiiiiiiiiiiiiii_i_}!.i!} !}!}i!;;i;iiii!lllliii;}i. ..i ii.i iii ii. ...;}i;;i;;i;;i;;i;;i;l.iiiiiiiiiiiiiiiii} i;;i;i.i;i;iiiiiiiiili Setting the Base Subbase '_ / Insulation II WoodFloor Plenum 25-20-46A Consideration must be given to the height of the base to allow for easy installation of the condensate drain. See Figure 31. This subbase for combustible floors has been designed so that the height of the subbase raises the downflow coil off the floor to allow easy installation of the condensate drain Condensate Line Raised by Base 25-20-52 Non-Combustible Floor Set the furnace over the opening in the floor. If necessary, grout around the base to seal air leaks between the base and the floor. Duct Connections In the downflow position, the return-air duct must be connected to only the top of the furnace. Top return connections can be made by removing the knockout panel in the furnace base. Return air con nection through the side(s) or back of the furnace is NOT allowed. 441 01 261302 Duct Design and Duct Installation Requirements See Section 10. Internal Filter in Top Return Installation When instal ling top-mounted filter inside the furnace, install the filter clips on the edge of the top duct opening with the wider end of the clips toward the blower as shown in Figure 32. Clips may be obtained from your distributor or fabricated from sheet metal (Figure 33). Insert filterintosideclips firstand push filter backuntil it is fully engaged into back clip. Top Mounted Internal Filter j_ Clip side-to-side 12. Checks and Adjustments Startup NOTE: Refer to startup procedures in the Users Information Manual. ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Failure to follow safety warnings exactly could result in death, personal injury and/or property damage. If any sparks, odors or unusual noises occur, immediately shut OFF gas and power to furnace. Check for wiring errors or obstruction to blower. Gas Supply Pressure Gas supply pressure sh...

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