Installation Guidelines for Flex Duct Series Air Handlers

When choosing the proper model Flex Dust Air Handler, primary consideration should be given to calculated BTU loads and available power supply.

AH-FD series air handlers are ductable units, designed to be installed low in cabin areas(under berths, lockers, etc.) and ducted to high supply air grilles. These units have blower-motor assemblies, providing flexibilty to fit specific space requirements and allowing for proper duct work installations. Combinations of transition boxes may be used supply air into more than one area from a single unit.

Securely fasten the AH-FD to a solid, level surface, using the mounting hardware provided. Be sure that the blower motor has at least 3" inchs of space in front of it to allow for proper air flow. Rotate and secure the blower, if necessary, to its proper position to provide the most direct routing of the ducting to transitions and supply air grilles. Route all ducting as smooth and straight as possible. Trim off excess ducting before makiing final conections. Secure the ducting every 48" (min.) to prevent movement while the vessel is under operation.

The return air inlets must be properly sized and located to allow adequate return airflow to the units. A return air filter is supplied standard with each unit. These filter assemblies should be checked periodically and cleaned when necessary. The return air grille should not be located in such a way as to allow the supply air stream to blow directly into its opening. This will cause "short cycling" of the unit, resulting in poor performance.

The supply air grille(s) must be sized and located to allow for proper air airculation within the cabin area(s). Grille locations close to the ceiling or directed upwards provide for the best air circulation. Under sized grilles and crushed or kinked duct work will result in poor or inadequate performance.

Connect a 5/8" reinforced flexible condensate hose to hte drain pan spud furthest aft . The drains may be teed together, providing there is minimum drop of 2" from the drain pan to tee fiting. The drain line must be routed downwards to a proper sump or overhead discharge. Properly secure the drain lines to prevent movement during vessel operation. Check the drains upon completion by pouring two quarts of water into the drain pan. Note: Condenstation drain lines may need to be insulated when located in high heat load areas to prevent line sweating, which could cause water damage.

CAUTION: Never sntall your air handler in the bilge or engine room areas. Insure that the selected location is sealed from direct access to bilge and/or engine room vapours. Do not terminate condensate drain line within three(3) feet of any outlet of engine or generator exhaust systems , nor in a bilge, unless the drain is connected properly to a sealed condensate or shower sump pump.