Carrier 50HJ008 Installation, Start-up And Service Instructions Manual

Also see for 50HJ008: Installation, Start-Up and Service Instructions

Contents

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Catalog No. 04-53500015-01 Printed in U.S.A. Form 50HJ-32SI Pg 1 9-05 Replaces: 50HJ-28SIBook 1 4Tab 1b 6bInstallation, Start-Up andService InstructionsCONTENTSPageSAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-46Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 1• ROOF CURB• SLAB MOUNT• ALTERNATE UNIT SUPPORTStep 2 — Field Fabricate Ductwork . . . . . . . . . . . . . . . 2Step 3 — Install Condensate Drain Lineand External Trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Step 4 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 4• POSITIONINGStep 5 — Make Electrical Connections . . . . . . . . . . . 7• FIELD POWER SUPPLY• FIELD CONTROL WIRING• HEAT ANTICIPATOR SETTINGSStep 6 — Adjust Factory-InstalledOptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12• HUMIDI-MIZER™ ADAPTIVE DEHUMIDIFICA-TION SYSTEM• DISCONNECT SWITCH• CONVENIENCE OUTLET• NOVAR CONTROLS• MANUAL OUTDOOR-AIR DAMPER• PREMIERLINK™ CONTROL• OPTIONAL ECONOMI$ER IV AND ECONOMI$ER2• ECONOMI$ER IV STANDARD SENSORS• ECONOMI$ER IV CONTROL MODESStep 7 — Adjust Evaporator-Fan Speed . . . . . . . . . 25PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43-47SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47-51TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 52-55INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . CL-1SAFETY CONSIDERATIONSInstallation and servicing of air-conditioning equipment canbe hazardous due to system pressure and electrical compo-nents. Only trained and qualified service personnel shouldinstall, repair, or service air-conditioning equipment.Untrained personnel can perform basic maintenance func-tions of cleaning coils and filters and replacing filters. All otheroperations should be performed by trained service personnel.When working on air-conditioning equipment, observe precau-tions in the literature, tags and labels attached to the unit, andother safety precautions that may apply.Follow all safety codes. Wear safety glasses and workgloves. Use quenching cloth for unbrazing operations. Havefire extinguisher available for all brazing operations.INSTALLATIONUnit is shipped in the vertical configuration. To convert tohorizontal configuration, remove side duct opening covers. Us-ing the same screws, install covers on vertical duct openingswith the insulation-side down. Seals around duct openingsmust be tight. See Fig. 1.Step 1 — Provide Unit SupportROOF CURB — Assemble and install accessory roof curb inaccordance with instructions shipped with curb. See Fig. 2.Install insulation, cant strips, roofing felt, and counter flashingas shown. Ductwork must be attached to curb. If electric orcontrol power is to be routed through the basepan, attach theaccessory thru-the-bottom service connections to the basepanin accordance with the accessory installation instructions. Con-nections must be installed before unit is set on roof curb.Curb should be level. This is necessary for unit drain tofunction properly. Unit leveling tolerances are shown in Fig. 3.Refer to Accessory Roof Curb Installation Instructions foradditional information as required.SLAB MOUNT (Horizontal Units Only) — Provide a levelconcrete slab that extends a minimum of 6 in. beyond unitcabinet. Install a gravel apron in front of condenser coil air inletto prevent grass and foliage from obstructing airflow.NOTE: Horizontal units may be installed on a roof curb ifrequired.ALTERNATE UNIT SUPPORT — When the curb or adaptercannot be used, support unit with sleeper rails using unit curbor adapter support area. If sleepers cannot be used, support thelong sides of the unit with a minimum of 3 equally spaced4-in. x 4-in. pads on each side.Ensure voltage listed on unit data plate agrees with electri-cal supply provided for the unit.Before performing service or maintenance operations onunit, turn off main power switch to unit and install lockouttag. Electrical shock could cause personal injury.IMPORTANT: The gasketing of the unit to the roof curbis critical for a watertight seal. Install gasket suppliedwith the roof curb as shown in Fig. 2. Improperlyapplied gasket can also result in air leaks and poor unitperformance.50HJ008-014Single-Package RooftopElectric Cooling Units