5402847-UIM-A-0917Johnson Controls Unitary Products 7These upflow coils are designed for installation on top of upflow fur-naces only.If the coil is used with a furnace of a different size, use a 45°transitionto allow proper air distribution through the coil.1. Position the coil casing over the furnace opening as shown in Fig-ure 6.2. Place the ductwork over the coil casing flange and secure.3. Check for air leakage between the furnace and coil casing and sealappropriately.CRITICAL COIL PROJECTIONThe coil assembly must be located in the duct such that a minimum dis-tance is maintained between the top of the coil and the top of the duct.Refer to Table 2.COIL / FURNACE ASSEMBLY - HC SERIES COILSThese coils are supplied ready to be installed in a right hand position ora left hand position. When used in conjunction with a horizontal furnace(blow through) application, the coil should be oriented with the openingof the “A” coil closest to the furnace. See Figure 7.DOWNFLOW DUCT CONNECTORSAll downflow installations must use a suitable duct connector approvedby the furnace manufacturer for use with this furnace. The duct connec-tors are designed to be connected to the rectangular duct under thefloor and sealed. Refer to the instructions supplied with the duct con-nector for proper installation.RESIDENTIAL AND MODULAR HOME UPFLOWRETURN PLENUM CONNECTIONReturn air may enter the furnace through the side(s) or bottom depend-ing on the type of application. Return air may not be connected into therear panel of the unit.BOTTOM RETURN AND ATTIC INSTALLATIONSBottom return applications normally pull return air through a base plat-form or return air plenum. Be sure the return platform structure or returnair plenum is suitable to support the weight of the furnace.The internal bottom panel must be removed for this application.Attic installations must meet all minimum clearances to combustiblesand have floor support with required service accessibility.HORIZONTAL APPLICATIONCAUTIONDo not drill any holes or drive any screws into the front duct flangeon the coil in order to prevent damaging coil tubing. See Figure 6.NOTICEEach coil is shipped with an external tie plate that should be used tosecure the coil to the furnace. It should be installed on the back sideof the coil using the dimpled pilot holes. See Figure 7.FIGURE 7: Horizontal Left or Right application (Right Shown)!Use tie platesupplied with coilAir flowGas FurnaceFIGURE 8: Combustible Floor Base AccessoryFIGURE 9: Horizontal ApplicationIMPORTANTThis furnace may be installed in a horizontal position on either side asshown above. It must not be installed on its back.FURNACEWARM AIR PLENUMWITH 1” FLANGESFIBERGLASSINSULATIONFIBERGLASS TAPEUNDER FLANGECOMBUSTIBLE FLOORBASE ACCESSORY