Bard WA421 Installation Instructions Manual

Bard WA421 Installation Instructions Manual Manual pdf 7 page image

Manual 2100-218Page 5SHIPPING DAMAGEUpon receipt of equipment, the carton should be checkedfor external signs of shipping damage. If damage isfound, the receiving party must contact the last carrierimmediately, preferably in writing, requesting inspectionby the carrier’s agent.GENERALThe equipment covered in this manual is to be installedby trained, experienced service and installationtechnicians.The refrigerant system is completely assembled andcharged. All internal wiring is complete.The unit is designed for use with or without duct work.Flanges are provided for attaching the supply and returnducts.These instructions explain the recommended method toinstall the air cooled self-contained unit and the electricalwiring connections to the unit.These instructions and any instructions packaged withany separate equipment required to make up the entire airconditioning system should be carefully read beforebeginning the installation. Note particularly “StartingProcedure” and any tags and/or labels attached to theequipment.While these instructions are intended as a generalrecommended guide, they do not supersede any nationaland/or local codes in any way. Authorities havingjurisdiction should be consulted before the installation ismade. See Page 1 for information on codes andstandards.Size of unit for a proposed installation should be basedon heat loss calculation made according to methods ofAir Conditioning Contractors of America (ACCA). Theair duct should be installed in accordance with theStandards of the National Fire Protection Association forthe Installation of Air Conditioning and VentilatingSystems of Other Than Residence Type, NFPA No. 90A,and Residence Type Warm Air Heating and AirConditioning Systems, NFPA No. 90B. Where localregulations are at a variance with instructions, installershould adhere to local codes.DUCT WORKAll duct work, supply and return, must be properly sizedfor the design air flow requirement of the equipment. AirConditioning Contractors of America (ACCA) is anexcellent guide to proper sizing. All duct work orportions thereof not in the conditioned space should beproperly insulated in order to both conserve energy andprevent condensation or moisture damage.Refer to Table 10 for maximum static pressure availablefor duct design.Design the duct work according to methods given by theAir Conditioning Contractors of America (ACCA).When duct runs through unheated spaces, it should beinsulated with a minimum of one inch of insulation. Useinsulation 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.A 1/4 inch clearance to combustible material for the firstthree feet of duct attached to the outlet air frame isrequired. See Wall Mounting Instructions and Figures 3and 4 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. Ametallic return air grille is required with installations notrequiring a return air duct. The spacing between louverson the 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 orfactory for ordering information. If using a return airfilter grille, filters must be of sufficient size to allow amaximum velocity of 400 fpm.NOTE: If no return air duct is used, applicable installationcodes may limit this cabinet to installation only ina single story structure.