Carrier WeatherMaker 48A020 Installation Instructions Manual

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Carrier WeatherMaker 48A020 Installation Instructions Manual Manual pdf 21 page image

21Table 6 — Evaporator Fan Motor DataNOTES:1. Motor shaft speed is 1750 rpm. The fan shaft diameter is 115 /16 inches.2. All indoor fan motors meet the minimum efficiency requirements as establishedby the Energy Policy Act of 1992 (EPACT), effective October 24, 1997.Step 3 — Field Fabricate Ductwork — Secure allducts to building structure. Use flexible duct connectors betweenunit and ducts as required. Insulate and weatherproof all externalductwork, joints, and roof openings with counter flashing andmastic in accordance with applicable codes.NOTE: Due to width of the horizontal supply and returnductwork, provisions should be made for servicing of the outdoorair filters (i.e., catwalk over ductwork).Ducts passing through an unconditioned space must be insulat-ed and covered with a vapor barrier. Outlet grilles must not lie di-rectly below unit discharge. The return duct must have a 90-de-gree elbow before opening into the building space if the unit isequipped with power exhaust.To attach ductwork to roof curb, insert duct approximately 10to 11 in. up into roof curb. Connect ductwork to 14-gage roof curbmaterial with sheet metal screws driven from inside the duct.Follow AMCA (Air Movement and Control Association)guidelines relating to ductwork connections to the unit. Theseguidelines recommend a minimum 2 1 /2 equivalent duct diame-ters of straight duct connected to supply air inlet and outletopenings before any transitions, fittings, dampers, etc. Failureto adhere to these guidelines may result in system effectswhich can impact the unit’s ability to achieve published perfor-mance.Step 4 — Make Unit Duct Connections48A2, A3, A6, AND A7 UNITS — Unit is shipped for thru-the-bottom duct connections. Field-fabricated ductwork should beattached to the roof curb. Supply and return duct dimensionsare shown in Fig. 5, 6, 9, and 12. Air distribution is shown inFig. 15. Refer to installation instructions shipped with roof curbfor more information.48A4, A5, A8, AND A9 UNITS — Remove shipping coversfrom supply and return air openings. Attach field-suppliedductwork to unit. Connect to the unit with a single duct for all sup-ply openings and with a single duct for all return openings. Split-ting of the airflow into branch ducts should not be done at the unit.Sufficient duct length should be used prior to branching to ensurethe air temperatures are well mixed within the ductwork. SeeFig. 7, 8, 10, and 11 for duct opening dimensions. Secure all ductsto building structure. Air distribution is shown in Fig. 16. Verifythe Outdoor Air Temperature (OAT) and Return Air Temperature(RAT) sensors as outlined in Fig. 17 can measure the OAT andRAT temperature sensors in the corresponding air streams. Relo-cate the sensor locations if needed.Install accessory barometric relief or power exhaust in the field-fabricated return ductwork. Refer to Step 11 — Position PowerExhaust/Barometric Relief Damper Hood section on page 30 formore information.UNITSIZE48AMOTORHPMOTORSHAFT DIA.(in.)FANSHAFTSPEED(RPM)MOTORSHEAVE(P/N)MOTORSHEAVEPITCHDIAMETER(in.)BUSHINGDIAMETER(in.)FANSHEAVE(P/N)FANSHEAVEPITCHDIAMETER(in.)BUSHINGDIAMETER(in.)BELT(QUANTITY)(P/N)BELTTENSION(lb at .25 in.)0205 1.125 717 BK55 4.8 NONE - 1.125 1B5V124 12.4 B - 1.9375 BX56 810 1.375 924 2BK50 4.4 NONE - 1.375 2B5V86 8.6 B - 1.9375 (2) BX50 815 1.625 1096 2B5V56 5.7 B - 1.625 2B5V90 9.1 B - 1.9375 (2) 5VX530 90255 1.125 773 BK55 5.2 NONE - 1.125 1B5V124 12.4 B - 1.9375 BX56 810 1.375 962 1B5V60 6.1 H - 1.375 1B5V110 11.1 B - 1.9375 5VX570 1115 1.625 1106 2B5V54 5.5 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 902710 1.375 848 2BK50 4.4 NONE - 1.375 2B5V94 9.4 B - 1.9375 (2) BX50 815 1.625 1059 2B5V56 4.9 B - 1.625 2B5V90 8.1 B - 1.9375 (2) 5VX530 1020 1.625 1187 2B5V58 5.9 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 1103010 1.375 856 2BK50 4.4 H - 1.375 2B5V94 9.0 B - 1.9375 (2) BX50 815 1.625 1096 2B5V56 5.7 B - 1.625 2B5V90 9.1 B - 1.9375 (2) 5VX530 920 1.625 1187 2B5V58 5.9 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 1103515 1.625 1025 2B5V50 5.1 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX500 920 1.625 1147 2B5V56 5.7 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 1025 1.875 1247 2B5V62 6.2 B - 1.875 2B5V86 8.7 B - 1.9375 (2) 5VX530 1104015 1.625 976 2B5V52 5.3 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX530 1020 1.625 1050 2B5V56 5.7 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX550 1125 1.875 1182 2B5V74 7.5 B - 1.875 2B5V110 11.1 B - 1.9375 (2) 5VX590 1105020 1.625 1050 2B5V56 5.7 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX550 1025 1.875 1142 2B5V62 6.2 B - 1.875 2B5V94 9.5 B - 1.9375 (2) 5VX570 1130 1.875 1234 2B5V66 6.7 B - 1.875 2B5V94 9.5 B - 1.9375 (2) 5VX570 1306025 1.875 1019 3B5V52 5.3 B - 1.875 3B5V90 9.1 B - 1.9375 (3) 5VX530 1230 1.875 1086 3B5V58 5.9 B - 1.875 3B5V94 9.5 B - 1.9375 (3) 5VX550 1240 2.125 1197 3B5V64 6.5 B - 2.125 3B5V94 9.5 B - 1.9375 (3) 5VX570 14WARNINGFor vertical supply and return units, tools or parts coulddrop into ductwork and cause an injury. Install a 90-degreeelbow turn in the supply and return ductwork between theunit and the conditioned space. If a 90-degree elbow cannotbe installed, then a grille of sufficient strength and densityshould be installed to prevent objects from falling into theconditioned space.Fig. 15 — Air Distribution — Thru-the-Bottoma48-8241