Carrier 38AU Installation, Start-up And Service Instructions Manual

Also see for 38AU: Installation, Start-Up and Service Instructions Installation, Start-Up and Service Instructions

Carrier 38AU Installation, Start-up And Service Instructions Manual Manual pdf 11 page image

11Matching 38AU Model To Evaporator CoilThe Model 38AUZ is a single-circuit unit design,requiring one set of refrigeration piping. This model canbe connected to an evaporator coil with one circuit or withtwo circuits (by manifolding the evaporator connectionsinto a single piping system).The Model 38AUD is a dual-circuit unit design thatrequires two sets of refrigeration piping between theoutdoor unit and the evaporator coil (or coils). This modelcan only be connected to an evaporator coil that has tworefrigeration circuits (or to two separate evaporator coils).The Model 38AUD CANNOT be connected to asingle-circuit evaporator coil. The Model 38AUDCANNOT be field-converted to a single-circuit design.Table 3 – Evaporator Coil ConnectionsEvaporator Coil has Connect to Model NotesSingle Circuit 38AUZ ONLYTwo Circuits38AUZ Manifold evaporatorcircuits into singlepiping systemOr38AUD Use two separatepiping systemsBefore unpacking this new 38AU model, compare theevaporator coil design to the 38AU model..INSTALLATIONJobsite SurveyComplete the following checks before installation.1. Consult local building codes and the NEC (NationalElectrical Code) ANSI/NFPA 70 for special installa-tion requirements.2. Determine unit location (from project plans) or selectunit location.3. Check for possible overhead obstructions which mayinterfere with unit lifting or rigging.Step 1 — Plan for Unit LocationSelect a location for the unit and its support system (pad,rails or other) that provides for the minimum clearancesrequired for safety. This includes the clearance tocombustible surfaces, unit performance and service accessbelow, around and above unit as specified in unitdrawings. See Fig. 5.NOTE: Consider also the effect of adjacent units onairflow performance and control box safety clearance.Do not install the outdoor unit in an area where fresh airsupply to the outdoor coil may be restricted or whenrecirculation from the condenser fan discharge is possible.Do not locate the unit in a well or next to high walls.Evaluate the path and required line length forinterconnecting refrigeration piping, including suctionriser requirements (outdoor unit above indoor unit), liquidline lift (outdoor unit below indoor unit) and hot gasbypass line. Relocate sections to minimize the length ofinterconnecting tubing.DO NOT BURY REFRIGERATION LINES.Although unit is weatherproof, avoid locations that permitwater from higher level runoff and overhangs to fall ontothe unit.LEFT:Min 18” (457 mm)requried for serviceRIGHT:Min 18” (457 mm)requried for serviceREAR:Min 18” (457 mm)requried for serviceNote: Observe requirements for 39” (914 mm) operating clearanceon either Left or Rear coil opening.FRONT:42” (1067 mm)C10201Fig. 5 -- Service Clearance Dimensional DrawingStep 2 — Complete Pre-Installation ChecksCheck Unit Electrical Characteristics: Confirm beforeinstallation of unit that voltage, amperage and circuitprotection requirements listed on unit data plate agree withpower supply provided.Un--crate Unit: Remove unit packaging except for the topskid assembly, which should be left in place until after theunit is rigged into its final location.Inspect Shipment: File a claim with shipping company ifthe shipment is damaged or incomplete.Consider System Requirements:S Consult local building codes and National ElectricalCode (NEC, U.S.A.) for special installationrequirements.S Allow sufficient space for airflow clearance, wiring,refrigerant piping, and servicing unit. See Fig.1 andFig. 2 for unit dimensions and weight distribution data.S Locate the unit so that the outdoor coil (condenser)airflow is unrestricted on all sides and above.S The unit may be mounted on a level pad directly on thebase channels or mounted on raised pads at supportpoints. See Tables 1A through 2B for unit operatingweights. See Fig. 1 and Fig. 2 for weight distributionbased on recommended support points.NOTE: If vibration isolators are required for a particularinstallation, use the data in Fig. 1 and Fig. 2 to make theproper selection.38AU