Carrier Comfort 48ES-A Installation Instructions Manual

Also see for 48ES---A: Owner's information manual Owner's information manual Owner's information manual Installation instructions

11Horizontal Duct CoversA09061BasepanDownflow(Vertical)SupplyKnockoutBasepanDownflow(Vertical)ReturnKnockoutA09060Fig. 9 -- Supply and Return Duct OpeningAdhere to the following criteria when selecting, sizing, andinstalling the duct system:1. Units are shipped for horizontal duct installation (byremoving duct covers).2. Select and size ductwork, supply--air registers, andreturn--air grilles according to American Society of Heating,Refrigeration and Air Conditioning Engineers (ASHRAE)recommendations.3. 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 weather--tight and airtight seal.4. All units must have field--supplied filters or accessory filterrack installed in the return--air side of the unit.Recommended sizes for filters are shown in Table 1.5. Size all ductwork for maximum required airflow (eitherheating or cooling) for unit being installed. Avoid abruptduct size increases or decreases or performance may beaffected.6. Adequately insulate and weatherproof all ductwork locatedoutdoors. Insulate ducts passing through unconditionedspace, and use vapor barrier in accordance with latest issueof Sheet Metal and Air Conditioning Contractors NationalAssociation (SMACNA) and Air Conditioning Contractorsof America (ACCA) minimum installation standards forheating and air conditioning systems. Secure all ducts tobuilding structure.7. Flash, weatherproof, and vibration isolate all openings inbuilding structure in accordance with local codes and goodbuilding practices.Step 10 — Install Electrical ConnectionsELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.The unit cabinet must have an uninterrupted, unbrokenelectrical ground. This ground may consist of an electricalwire connected to the unit ground screw in the controlcompartment, or conduit approved for electrical groundwhen installed in accordance with NFPA 70 (NEC) (latestedition) (in Canada, Canadian Electrical Code CSA C22.1)and local electrical codes.! WARNINGUNIT COMPONENT DAMAGE HAZARDFailure to follow this caution may result in damage to theunit being installed.1. Make all electrical connections in accordance with NFPA70 (NEC) (latest edition) and local electrical codesgoverning such wiring. In Canada, all electricalconnections must be in accordance with CSA standardC22.1 Canadian Electrical Code Part 1 and applicablelocal codes. Refer to unit wiring diagram.2. Use only copper conductor for connections betweenfield--supplied electrical disconnect switch and unit. DONOT USE ALUMINUM WIRE.3. Be sure that high--voltage power to unit is withinoperating voltage range indicated on unit rating plate. On3--phase units, ensure phases are balanced within 2percent. Consult local power company for correction ofimproper voltage and/or phase imbalance.4. Insulate low--voltage wires for highest voltage containedwithin conduit when low--voltage control wires are insame conduit as high--voltage wires.5. Do not damage internal components when drillingthrough any panel to mount electrical hardware, conduit,etc.! CAUTIONHigh--Voltage ConnectionsWhen routing power leads into unit, use only copper wire betweendisconnect and unit. The high voltage leads should be in a conduituntil they enter the duct panel; conduit termination at the ductpanel must be watertight.The unit must have a separate electrical service with afield--supplied, waterproof disconnect switch mounted at, or withinsight from, the unit. Refer to the unit rating plate, NEC and localcodes for maximum fuse/circuit breaker size and minimum circuitamps (ampacity) for wire sizing.The field--supplied disconnect switch box may be mounted on theunit over the high--voltage inlet hole when the standard power andlow--voltage entry points are used (See Fig. 2 and 3 for acceptablelocation).NOTE: Field supplied disconnect switch box should bepositioned so that it does not cover up any of the unit gascombustion supply air louvers.See unit wiring label (Fig. 14, 15 and 16) and Fig. 10 for referencewhen making high voltage connections. Proceed as follows tocomplete the high--voltage connections to the unit.48ES-- A