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Fedders AFPB24B1 Instruction Manual
Also see for AFPB24A1: Specifications
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5Downflow ApplicationInstallation Considerations• No downflow sub-base is required with this airhandler, however, local codes may require the useof a non-combustible sub-base when used withelectric heater kit.• An “L” or “T” shaped duct enclosure MUST be usedas a supply plenum. No registers or outlets SHALL belocated directly below the air handler supply outlet.• Size and frame the floor opening as shown in Figure 5.Refer to the Dimension drawing on page 10. CareMUST be taken not to overcut the floor opening.• Caulk around the floor opening with a non-flammable caulk such as silicone. Set the air handlerin place and secure the air handler properly.• Allow access to the low voltage connection bybuilding the platform so that there is a minimum of51/2" between the floor and the unit flange.Return Air Filter ClearanceOn downflow applications, certain coil models willprotrude from the top of the air handler (coils greaterthan 15" tall on A24 through A36 air handlers and coilsgreater than 18" on A42 through A60 air handlers). Onthese models, the return air filter may be removed anda separate filter grille may be installed for closetapplications.If this method is not desirable, cabinet extension kit No.65-1647 for A24, A30, and A36; or No.65-1649 for A42,A48, and A60 may be ordered. The extension kit screwsto the side of the air handler and extends the length ofthe air handler coil cabinet. In addition, the kit includesa filter compartment and door.Emergency Drain OpeningThe indoor coil emergency drain opening must be usedfor this application. Refer to page 8 for instructions oncondensate tubing.1. Remove coil access door.2. Slide coil out of air handler.3. Remove coil rack from air handler by removingscrews from side of air handler.4. Relocate rack in air handler as shown in Figure 4using screws from side of air handler.5. Turn air handler into downflow position.6. Slide refrigerant coil into air handler.7. Reverse and replace air handler door(s).Relocating CoilRemove the threescrews on both sides.Flip over and replacein new position usingpre-punched holes.UPFLOWPOSITIONSUPPLYOPENINGRACKPOSITIONFILTERDOORDOWNFLOWPOSITIONSUPPLYOPENINGFILTERDOOR Relocating Coil for Downflow PositionUNITFLANGE5 1/2”FLOORFLOORPLENUMAIR HANDLER2 X 6 BOTHSIDES AND BACK114115 Supply Plenum Floor OpeningCAUTIONThe coil MUST be relocated for downflowapplication. |
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