Carrier SINGLE PACKAGED ELECTRIC COOLING UNITS 50GS Installation And Operating Instructions Manual

Also see for 50GS018 Guide: Manual

Contents

5. It is recommended that the unit base insulation around theperimeter of the vertical return-air opening be secured to theunit base with aluminum tape. Applicable local codes mayrequire aluminum tape to prevent exposed fiberglass.6. Cover both horizontal duct openings with the duct covers fromthe accessory duct cover kit. Ensure opening is air-andwatertight.7. After completing unit conversion, perform all safety checksand power up unit.NOTE: The design and installation of the duct system must be inaccordance with the standards of the NFPA for installation ofnonresidence-type air conditioning and ventilating systems, NFPA90A or residence-type, NFPA 90B; and/or local codes andordinances.Adhere to the following criteria when selecting, sizing, andinstalling the duct system:8. Units are shipped for side shot installation.9. Select and size ductwork, supply-air registers, and return-airgrilles according to American Society of Heating, Refrigera-tion and Air Conditioning Engineers (ASHRAE) recommen-dations.10. Use flexible transition between rigid ductwork and unit toprevent transmission of vibration. The transition may bescrewed or bolted to duct flanges. Use suitable gaskets toensure weathertight and airtight seal.11. All units must have field-supplied filters or accessory filterrack installed in the return-air side of the unit. Recommendedsizes for filters are shown in Tables 1 and 2.12. Size all ductwork for maximum required airflow (eitherheating or cooling) for unit being installed. Avoid abrupt ductsize increases or decreases or performance may be affected.13. Adequately insulate and weatherproof all ductwork locatedoutdoors. Insulate ducts passing through unconditioned space,and use vapor barrier in accordance with latest issue of SheetMetal and Air Conditioning Contractors National Association(SMACNA) and Air Conditioning Contractors of America(ACCA) minimum installation standards for heating and airconditioning systems. Secure all ducts to building structure.14. Flash, weatherproof, and vibration-isolate all openings inbuilding structure in accordance with local codes and goodbuilding practices.Step 8—Install Electrical ConnectionThe unit cabinet must have an uninterrupted, unbrokenelectrical ground to minimize the possibility of personalinjury if an electrical fault should occur. This ground mayconsist of an electrical wire connected to the unit ground lugin the control compartment, or conduit approved for electricalground when installed in accordance with NEC (NationalElectrical Code) ANSI/NFPA (latest edition) and local elec-trical codes. In Canada, follow Canadian Electrical CodeCSA (Canadian Standards Association) C22.1 and localelectrical codes. Failure to adhere to this warning could resultin personal injury or death.Fig. 7—Condensate TrapC990131” (25mm) MIN.2” (50mm) MIN.TRAPOUTLETTable 3—Minimum Airflow for Safe Electric HeaterOperation (Cfm)SIZE018 024 030 036 042 048 060700 800 1000 1200 1400 1600 2000Fig. 8—Supply and Return Duct OpeningC99011SUPPLYDUCTOPENINGRETURNDUCTOPENING9