Unitary products group DM 036 Installation Manual

Contents

Unitary products group DM 036 Installation Manual Manual pdf 16 page image

66399-YIM-C-040516 Unitary Products GroupIf a unit is to be installed on a roof curb or special frameother than a YORK roof curb, gasketing must beapplied to all surfaces that come in contact with the unitunderside.RIGGING AND HANDLINGExercise care when moving the unit. Do not removeany packaging until the unit is near the place of installa-tion. Rig the unit by attaching chain or cable slings tothe lifting holes provided in the base rails. Spreaderbars, whose length exceeds the largest dimensionacross the unit, MUST BE USED.Units may also be moved or lifted with a forklift. Slottedopenings in the base rails are provided for this pur-pose. Fork lengths must be a minimum of 42 inches.Remove the nesting brackets from the four corners onthe top of the unit. All screws that are removed whenremoving the brackets must be replaced on the unit.Refer to Tables 14, 16 and 18 for unit weights and tothe Figure 9 for approximate center of gravity.CLEARANCESAll units require certain clearances for proper operationand service. Installer must make provisions for ade-quate combustion and ventilation air in accordance withSection 5.3, Air for Combustion and Ventilation of theNational Fuel Gas Code, ANSI Z223.1 (in U.S.A.) orSections 7.2, 7.3 or 7.4 of Gas Installation Codes CSA-B149.1 (in Canada) and/or applicable provisions of thelocal building codes. Refer to Dimensions and Clear-ances shown in Figures 10 through 13 and Tables 41and 42 for the clearances required for combustible con-struction, servicing, and proper unit operation.DUCTWORKDuctwork should be designed and sized according tothe methods in Manual Q of the Air Conditioning Con-tractors of America (ACCA).A closed return duct system shall be used. This shallnot preclude use of economizers or outdoor fresh airintake. The supply and return air duct connections atthe unit should be made with flexible joints to minimizenoise.The supply and return air duct systems should bedesigned for the CFM and static requirements of thejob. They should NOT be sized to match the dimen-sions of the duct connections on the unit.Refer to Figures 10 through 14 for information concern-ing side and bottom supply and return air duct openings.NOTE: It is recommended that, in Canada, the outletduct be provided with a removable accesspanel. It is recommended that this opening beaccessible when the unit is installed in service,and of a size such that smoke or reflected lightmay be observed inside the casing to indicatethe presence of leaks in the heat exchanger.The cover should be attached in a manneradequate to prevent leakage.Excessive exposure of this furnace to contami-nated combustion air may result in equipmentdamage or personal injury. Typical contami-nates include: permanent wave solutions, chlo-rinated waxes and cleaners, chlorine basedswimming pool chemicals, water softeningchemicals, carbon tetrachloride, Halogen typerefrigerants, cleaning solvents (e.g. perchloro-ethylene), printing inks, paint removers, var-nishes, hydrochloric acid, cements and glues,antistatic fabric softeners for clothes dryers,masonry acid washing materials.Before lifting a unit, make sure that all panelsare in place and that its weight is distributedequally on all cables so it will lift evenly.Do not permit overhanging structures or shrubsto obstruct outdoor air discharge outlet, com-bustion air inlet or vent outlets.When fastening ductwork to side duct flangeson unit, insert screws through duct flangesonly. DO NOT insert screws through casing.Outdoor ductwork must be insulated andwaterproofed.