Bard WH421 Installation Instructions Manual

Also see for WH421: Specifications Installation instructions

Manual 2100-399Page 5SHIPPING DAMAGEUpon receipt of equipment, the carton should bechecked for external signs of shipping damage. Ifdamage is found, the receiving party must contact thelast carrier immediately, preferably in writing,requesting inspection by 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 and any instructions packaged withany separate equipment required to make up the entireheat pump 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 installationis made. 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 Associationfor the 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 WORKAny heat pump is more critical of proper operatingcharge and an adequate duct system than a straight airconditioning unit. All duct work, supply and return,must be properly sized for the design air flowrequirement of the equipment. Air ConditioningContractors of America (ACCA) is an excellent guide toproper sizing. All duct work or portions thereof not inthe conditioned space should be properly insulated inorder to both conserve energy and prevent condensationor moisture damage.CAUTIONSome installations may not require any returnair duct. A metallic return air grille is requiredwith installations not requiring a return airduct. The spacing between louvers on thegrille shall not be larger than 5/8 inches.Any grille that meets the 5/8 inch louver criteria, maybe used. It is recommended that Bard Return Air GrilleKit RG-2 thru RG-5 or RFG-2 thru RFG-5 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, applicableinstallation codes may limit this cabinet toinstallation only in a single story structure.FILTERSA 1 inch throwaway filter is supplied with each unit.The filter slides into position making it easy to service.This filter can be serviced from the outside by removingthe service door. A 1 inch washable filter and 2 inchpleated filter are also available as optional accessories.The internal filter brackets are adjustable toaccommodate the 2 inch filter by bending down the tabsto allow spacing for the 2 inch filters.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.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.A 1/4 inch clearance to combustible material for the firstthree feet (3') of duct attached to the outlet air frame isrequired. See Wall Mounting Instructions and Figures 4and 4 for further details.Ducts through the walls must be insulated and all jointstaped or sealed to prevent air or moisture entering thewall cavity.