Carrier 50HC Series Service And Maintenance Instructions

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Carrier 50HC Series Service And Maintenance Instructions Manual pdf 1 page image

50HCSingle Package Rooftop Electric Cooling Unitwith Puron (R---410A) Refrigerant3 to 12.5 Nominal Tons (Sizes 04---14)Service and Maintenance InstructionsTABLE OF CONTENTSSAFETY CONSIDERATIONS 1. . . . . . . . . . . . . . . . . . . .UNIT ARRANGEMENT AND ACCESS 2. . . . . . . . . . .SUPPLY FAN (BLOWER) SECTION 4. . . . . . . . . . . . . .STAGED AIR VOLUME CONTROL --2 SPEED FANWITH VARIABLE FREQUENCY DRIVE (VFD) 7. . . .ADDITIONAL VARIABLE FREQUENCY DRIVE(VFD) INSTALLATION AND TROUBLESHOOTING. 8MOTOR 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .COOLING 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .THERMOSTATIC EXPANSION VALVE (TXV) 14. . . .PURONR (R--410A) REFRIGERANT 15. . . . . . . . . . . . .COOLING CHARGING CHARTS 17. . . . . . . . . . . . . . . .COMPRESSOR 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CONVENIENCE OUTLETS 24. . . . . . . . . . . . . . . . . . . .SMOKE DETECTORS 25. . . . . . . . . . . . . . . . . . . . . . . . .SENSOR AND CONTROLLER TESTS 29. . . . . . . . . . .PROTECTIVE DEVICES 32. . . . . . . . . . . . . . . . . . . . . . .PREMIERLINK CONTROL 33. . . . . . . . . . . . . . . . . . .RTU--OPEN CONTROL SYSTEM 33. . . . . . . . . . . . . . . .SENSORY/ACCESSORY INSTALLATION 34. . . . . . . .ADDITIONAL RTU--OPEN INSTALLATION ANDTROUBLESHOOTING 34. . . . . . . . . . . . . . . . . . . . . . . . .ECONOMIZER UNITS 36. . . . . . . . . . . . . . . . . . . . . . . .PRE--START--UP/START--UP 44. . . . . . . . . . . . . . . . . . . .START--UP, GENERAL 45. . . . . . . . . . . . . . . . . . . . . . . .START--UP, PREMIERLINK CONTROLS 46. . . . . . .START--UP, RTU--OPEN CONTROLS 46. . . . . . . . . . . .FASTENER TORQUE VALUES 47. . . . . . . . . . . . . . . . .APPENDIX I. MODEL NUMBER SIGNIFICANCE 48.APPENDIX II. PHYSICAL DATA 49. . . . . . . . . . . . . . . .APPENDIX III. FAN PERFORMANCE 52. . . . . . . . . . .APPENDIX IV WIRING DIAGRAMS 71. . . . . . . . . . . .APPENDIX V. MOTORMASTER SENSORLOCATIONS 121. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .UNIT START-UP CHECKLIST 124. . . . . . . . . . . . . . . . .SAFETY CONSIDERATIONSInstallation and servicing of air-conditioning equipmentcan be hazardous due to system pressure and electricalcomponents. Only trained and qualified service personnelshould install, repair, or service air-conditioningequipment. Untrained personnel can perform the basicmaintenance functions of replacing filters. Trained servicepersonnel should perform all other operations.When working on air-conditioning equipment, observeprecautions in the literature, tags and labels attached tothe unit, and other safety precautions that may apply.Follow all safety codes. Wear safety glasses and workgloves. Use quenching cloth for unbrazing operations.Have fire extinguishers available for all brazing andunbrazing operations.Read these instructions thoroughly and follow allwarnings or cautions attached to the unit. Consult localbuilding codes and National Electrical Code (NEC) forspecial requirements.Recognize safety information. This is the safety ALERTsymbol . When you see this symbol on the unit and ininstructions or manuals, be aware of the potential forphysical injury hazards.Understand the signal words DANGER, WARNING, andCAUTION. These words are used with the safety--ALERTsymbol. DANGER indicates a hazardous situation which,if not avoided, will result in death or severe personalinjury. WARNING indicates a hazardous situation which,if not avoided, could result in death or personal injury.CAUTION indicates a hazardous situation which, if notavoided, could result in minor to moderate injury orproduct and property damage. NOTICE is used to addresspractices not related to physical injury. NOTE is used tohighlight suggestions which will result in enhancedinstallation, reliability, or operation.