Bard K36A2-A Installation Instructions Manual

Contents

Manual 2100628Page 5 of 24DUCT WORKAll duct work, supply and return, must be properlysized for the design airflow requirement of theequipment. Air Conditioning Contractors of America(ACCA) is an excellent guide to proper sizing. All ductwork or portions thereof not in the conditioned spaceshould be properly insulated in order to both conserveenergy and prevent condensation or moisture damage.Refer to Table 9 Maximum ESP of Operation – ElectricHeat Only on page 24.Design the duct work according to methods given bythe Air Conditioning Contractors of America (ACCA).When duct runs through unheated spaces, it should beinsulated with a minimum of one inch of insulation.Use insulation with a vapor barrier on the outside of theinsulation. Flexible joints should be used to connect theduct work to the equipment in order to keep the noisetransmission to a minimum.All models covered by this installation instructionsrequire a 1/4 inch clearance to combustible materialfor the first three feet of duct attached to the outlet airframe is required. See Wall Mounting Instructions andFigures 2 and 3 on pages 8 and 9 for further details.Ducts through the walls must be insulated and all jointstaped or sealed to prevent air or moisture entering thewall cavity.Some installations may not require any return air duct.A metallic return air grille is required with installationsnot requiring a return air duct. The spacing betweenlouvers on the grille shall not be larger than 5/8 inch.Any grille that meets with 5/8 inch louver criteria maybe used. It is recommended that Bard Return AirGrille Kit RG5 or RFG5 be installed when no returnduct is used. Contact distributor or factory for orderinginformation. If using a return air filter grille, filtersmust be of sufficient size to allow a maximum velocityof 400 fpm.NOTE: If no return air duct is used, applicableinstallation codes may limit this cabinet to installationonly in a single story structure.FILTERSA 2-inch pleated filter is standard with each unit. Thefilter slides into position making it easy to service. Thisfilter can be serviced from the outside by removing thefilter access panel.CONDENSATE DRAINA plastic drain hose extends from the drain pan atthe top of the unit down to the unit base. There areopenings in the unit base for the drain hose to passthrough. In the event the drain hose is connected toa drain system of some type, it must be an open orvented type system to assure proper drainage.