Bard W17A2 Installation Instructions Manual

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Bard W17A2 Installation Instructions Manual Manual pdf 5 page image

Manual 2100-581BPage 5 of 26DUCT WORKAll duct work, supply and return, must be properly sizedfor the design airflow requirement of the equipment.Air Conditioning Contractors of America (ACCA) is anexcellent guide to proper sizing. All duct work or portionsthereof not in the conditioned space should be properlyinsulated in order to both conserve energy and preventcondensation or moisture damage.Refer to Maximum ESP of operation Electric Heat Table 7.Design the duct work according to methods given by the AirConditioning Contractors of America (ACCA). When ductruns through unheated spaces, it should be insulated with aminimum of one inch of insulation. Use insulation with avapor barrier on the outside of the insulation. Flexible jointsshould be used to connect the duct work to the equipment inorder to keep the noise transmission to a minimum.Models W17 - W24 as approved for zero inch clearance tothe supply duct. For model series W30, W36, W42, W48,W60 and W70 a 1/4 inch clearance to combustible materialfor the first three feet of duct attached to the outlet air frameis required. See Wall Mounting Instructions and Figures 3and 4 for further details.Ducts through the walls must be insulated and all joints tapedor sealed to prevent air or moisture entering the wall cavity.Some installations may not require any return air duct. Ametallic return air grille is required with installations notrequiring a return air duct. The spacing between louvers onthe grille shall not be larger than 5/8 inch.Any grille that meets with 5/8 inch louver criteria may beused. It is recommended that Bard Return Air Grille KitRG2 through RG5 or RFG2 through RFG5 be installedwhen no return duct is used. Contact distributor or factoryfor ordering information. If using a return air filter grille,filters must be of sufficient size to allow a maximumvelocity of 400 fpm.NOTE: If no return air duct is used, applicable installationcodes may limit this cabinet to installation only in asingle story structure.FILTERSA 1-inch throwaway filter is standard with each unit.The filter slides into position making it easy to service.This filter can be serviced from the outside by removingthe filter access panel. A 1-inch washable filter and2-inch pleated filter are also available as optionalaccessories. The internal filter brackets are adjustableto accommodate the 2-inch filter by bending two (2)tabs down on each side of the filter support bracket.FRESH AIR INTAKEAll units are built with fresh air inlet slots punched inthe service door.If the unit is equipped with a fresh air damper assembly,the assembly is shipped already attached to the unit.The damper blade is locked in the closed position.To allow the damper to operate, the maximum andminimum blade position stops must be installed. SeeFigure 1.All capacity, efficiency and cost of operationinformation is based upon the fresh air blank-off platein place and is recommended for maximum energyefficiency.The blank-off plate is available upon request from thefactory and is installed in place of the fresh air dampershipped with each unit.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 to adrain system of some type, it must be an open or ventedtype system to assure proper drainage.FIGURE 1FRESH AIR DAMPER