Carrier 50AJ/AK/AM020 Installation Instructions Manual

Contents

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 535-00075 Printed in U.S.A. Form 50A-1SI Pg 1 7-03 Replaces: NewBook 1Tab 1bInstallation InstructionsCONTENTSPageSAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-46Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 1• ROOF CURB• ALTERNATE UNIT SUPPORTStep 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 1• POSITIONING• ROOF MOUNTStep 3 — Field Fabricate Ductwork . . . . . . . . . . . . . . . 2Step 4 — Make Unit Duct Connections . . . . . . . . . . . 2Step 5 — Trap Condensate Drain . . . . . . . . . . . . . . . . 18Step 6 — Make Electrical Connections . . . . . . . . . . 18• POWER WIRING• FIELD POWER SUPPLY• FIELD CONTROL WIRINGStep 7 — Make Outdoor-Air InletAdjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42• ECONOMIZER AND FIXED OUTDOORAIR DAMPERStep 8 — Position Power Exhaust/BarometricRelief Damper Hood. . . . . . . . . . . . . . . . . . . . . . . . . . . 44Step 9 — Route Static Pressure Sensors . . . . . . . . 45Step 10 — Install All Accessories . . . . . . . . . . . . . . . 45Step 11 — Field Modifications. . . . . . . . . . . . . . . . . . . 46SAFETY CONSIDERATIONSInstallation and servicing of air-conditioning equipment canbe hazardous due to system pressure and electrical compo-nents. Only trained and qualified service personnel should in-stall, repair, or service air-conditioning equipment.Untrained personnel can perform the basic maintenancefunctions of cleaning coils and filters and replacing filters. Allother operations should be performed by trained service per-sonnel. When working on air-conditioning equipment, observeprecautions in the literature, tags and labels attached to the unit,and other safety precautions that may apply.Follow all safety codes. Wear safety glasses and workgloves. Use quenching cloth for unbrazing operations. Havefire extinguishers available for all brazing operations.INSTALLATIONStep 1 — Provide Unit SupportROOF CURB — For vertical discharge units, assemble or in-stall accessory roof curb in accordance with instructionsshipped with this accessory. See Fig. 1-4. Install insulation,cant strips, roofing, and counter flashing as shown. Ductworkcan be installed to roof curb before unit is set in place. Curbshould be level. This is necessary to permit unit drain to func-tion properly. Unit leveling tolerance is shown in Fig. 1-4.Refer to Accessory Roof Curb Installation Instructions foradditional information as required. When accessory roof curbis used, unit may be installed on class A, B, or C roof coveringmaterial.ALTERNATE UNIT SUPPORT — When the preferred curbor slab mount cannot be used, support unit with sleepers onperimeter, using unit curb support area. If sleepers cannot beused, support long sides of unit (refer to Fig. 5-10) with a mini-mum number of 4-in. x 4-in. pads spaced as follows:50AJ,AK,AW,AY020-035 units require 3 pads on each side;50AJ,AK,AW,AY040-050 units require 4 pads on each side;50AJ,AK,AW,AY060 units require 6 pads on each side. Unitmay sag if supported by corners only.Step 2 — Rig and Place Unit — Inspect unit fortransportation damage. See Tables 1-3 for physical data andspecifications. File any claim with transportation agency.Do not drop unit; keep upright. Use spreader bars over unitto prevent sling or cable damage. This unit must be handledwith a crane and can not be handled by a fork truck. Level byusing unit frame as a reference; leveling tolerance is shown inFig. 1-4. See Fig. 11 for additional information. Unit operatingweight is shown in Table 2.Before performing service or maintenance operations onunit, turn off main power switch to unit. Electrical shockcould cause personal injury.1. Improper installation, adjustment, alteration, service,or maintenance can cause property damage, personalinjury, or loss of life. Refer to the User’s InformationManual provided with this unit for more details.2. Do not store or use gasoline or other flammable va-pors and liquids in the vicinity of this or any otherappliance.1. All panels must be in place when rigging.2. Unit is not designed for handling by fork truck.IMPORTANT: The gasketing of the unit to the roof curb iscritical for a watertight seal. Install gasket with the roofcurb as shown in Fig. 1-4. Improperly applied gasket canalso result in air leaks and poor unit performance.50AJ,AK,AW,AY020-060With Scroll Compressor andComfortLink™ ControlSingle Package Rooftop UnitsElectric Cooling with Electric Heat Option