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(see Figure 4) Horizontally installed furnaces may be vented out the top of the unit or out the side facing u p. See"Side venting" for instructions to rotate the vent to the side. The minimum clearances to combustibles MUST be maintained between the furnace and adjacent construction, as shown in Figure 1 and Figure 2. ONLY the corner of the cabinet is allowed to contact the rafters as shown in Figure 4. All other clearances MUST be observed as shown in Figure 1 and Figure 2. Typical Horizontal Installation SUPPLY GAS SUPPLY OPTIONAL VENT LOCATION 25-23-18a If the furnace is to be suspended from the floor joists in a basement or crawl space or the rafters in an attic, it is necessary to use steel pipe straps or an angle iron frame to attach the furnace. These straps should be attached to the furnace bottom side with sheet metal screws and to the rafters or joists with bolts. The preferred method is to use an angle iron frame bolted to the rafters or joists. If the furnace is to be installed at ground level in a crawl space, consult local codes. A concrete pad 1" to 2" thick is recommended. Twenty four inches (24") is required between the front of the furnace and adjacent construction or other appliances. This should be maintained for service clearance. Keep all insulating materials clear from Iouvered door. Insulating materials may be combustible. 441 01 2613 02 furnace and the combustible wood floor and extend 12" beyond the front of the furnace louver door. (This is a recommendation only, not a requirement). This furnace MUST NOT be installed directly on carpeting, tile or other combustible material other than wood flooring or supports. Downflow FIRE HAZARD. Failure to install unit on noncombustible subbase could result in death, personal injury and/or property damage. Place furnace on noncombustible subbase on downflow applications, unless installing on noncombustible flooring. If you purchased a Multi-position furnace (N8MP or *8MP) it may be installed in a downflow configuration, (see Figure 5). The minimum clearances to combustion construction MUST be maintained between the furnace and adjacent construction, as shown in Figure 1 and Figure 2. In addition to clearances in Figure 1 and Figure 2, clearance for the vent pipe must be considered. A subbase for combustible floors MUST be used when the furnace is installed as a downflow on combustible material. See 11. "Duct work and Filter" (Downflow Section). The outlet flange must be bent flat for downflow installation. When installing a four-position furnace in the downflow position (not the *8DNL furnace), the logo is to be repositioned so that it is rightside-up as follows: T8MPN/L 1. Find the door hardware kit that is stored in the furnace and save it. 2. Carefully remove logo from the outside of burner compartment door and save it. 3. Carefully remove two small plug buttons from outside of blower compartment door and save them. 4. Remove two thumbscrews from blower compartment door. 5. Install two thumbscrews in holes at other end of blower compartment door from where thumbscrews were removed. 6. Install new strip of rubber gasket on inside of blower compartment door on edge that does not already have a gasket. 7. Install logo retainer pins into holes in blower compartment door from which plug buttons were removed. 8. Install plug buttons into holes in burner compartment door from which logo was removed. 9. Install blower compartment door on furnace with bevel edge and logo at top. 10. Install burner compartment door on furnace with bevel edge at bottom. N8MPN/L, C81VlPN/L, H8MPN/L 1, Carefully remove logo from burner compartment door and save it. 2. Turn the logo rightside-up, and install the logo retainer pins into holes in burner compartment door. 3. Newlabelsforrightside-uponoutside applicationofblower compartmentinakitfrom doormaybepurchasedyourdistrib utortocoverupside-down labels. DownflowVenting:venterberotatedto ThecombustionMUST ventoutthesideforalldownflow(seeFigure5).Bot installations, tomventingSee"Sideforinstructions isnotpermitted.venting"to rotatetheventtotheside.Inadditionthevent torotatingtotheside aVentPipeShield(NAHAOO2VC)toshieldthehot isrequired ventpipe. BURN HAZARD. Vent pipe is HOT and could cause personal injury. Hot vent pipe is in reach of small children when installed in downflow position. Install vent pipe shield NAHA002VC. Pressure Switch Relocation If the furnace is installed in the u pflow position, the pressure switch will remain in the same position as installed by the factory unless the inducer is rotated. If the furnace is installed in an orientation that places the pressure switch below the pressure tap on the in ducer housing, then the switch MUST be relocated. In order to relocate the switch, locate 2 mounting holes or drill above the inducer pressure tap. When drilling the 2 holes make sure to keep the switch and tubing far enough away from the burners or hot sur faces as to not melt the hose, switch, or wires. ...

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