York P*UR 40 Installation Instructions Manual

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York P*UR 40 Installation Instructions Manual Manual pdf 11 page image

035-14370-000 650.75-N4UUnitary Products Group 11SUPPLY AIR DUCTSInstallations on combustible material or floors must use acombustible floor base (shown in Figure 7 - 1CB0314, 17, 21& 24) as specified on the rating plate or a matching coolingcoil. Follow the instructions supplied with the combustiblefloor base accessory.This base can be replaced with a matching cooling coil, prop-erly sealed to prevent leaks. Follow the cooling coil instruc-tions for installing the plenum.All downflow application supply duct systems must bedesigned and installed in accordance with the standards ofNFPA 90A and 90B, and/or all local codes.DOWNFLOW / HORIZONTAL MODELS -HORIZONTAL APPLICATIONDownflow furnaces may be installed horizontally with the sup-ply airflow toward the left or right by laying the unit on the leftor right side panel.After determining the best orientation, lay the unit on top ofthe shipping carton to protect the finish. The appropriate elec-trical knock-outs for power wiring, control wiring and gas pip-ing should be removed at this time.For horizontal application, return air may enter through theend only. Return air may not be connected into the rearpanel of the unit.HORIZONTAL FILTERSAll filters and mounting provision must be field supplied. Fil-ters(s) may be located in the duct system external to the fur-nace or in a return filter grille(s).ATTIC INSTALLATIONFIGURE 7 : COMBUSTIBLE FLOOR BASEACCESS’YDOWNFLOWFURNACEWARM AIR PLENUMWITH 1" FLANGESFIBERGLASSINSULATIONFIBERGLASS TAPEUNDER FLANGECOMBUSTIBLE FLOORBASE ACCESSORYDo not install the unit on the rear panel.FIGURE 8 : TYPICAL ATTIC INSTALLATIONVENT (MAINTAINREQUIRED CLEARANCESTO COMBUSTIBLES)GAS PIPINGSEDIMENT TRAP12" 30" MINWORK AREASHEET METALIN FRONT OF FURNACECOMBUSTIONAIR OPENINGS ISRECOMMENDEDRETURN AIRSUPPLY AIRLINE CONTACT ONLY PERMISSIBLEBETWEEN LINES FORMED BY THEINTERSECTION OF FURNACE TOPAND TWO SIDES AND BUILDINGJOISTS, STUDS OR FRAMING