Carrier 48LC Series Controls, Start-up, Operation And Troubleshooting

Also see for 48LC 05: Controls, Start-Up, Operation and Troubleshooting Service and maintenance instructions Service and maintenance instructions

Contents

Carrier 48LC Series Controls, Start-up, Operation And Troubleshooting Manual pdf 2 page image

2Programming Operating Schedules 10. . . . . . . . . . . . . . . . . . . .SERVICE TEST 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Independent Outputs 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Fan Test 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cooling Test 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Heating Test 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Automatic Test 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .THIRD PARTY CONTROL 12. . . . . . . . . . . . . . . . . . . . . . . . . .Cooling/Heating Control 12. . . . . . . . . . . . . . . . . . . . . . . . . . . .Dehumidification Control 12. . . . . . . . . . . . . . . . . . . . . . . . . . .Remote Occupancy 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Remote Shutdown 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Alarm Output 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Economizer Damper Control 12. . . . . . . . . . . . . . . . . . . . . . . . .CONTROLS OPERATION 12. . . . . . . . . . . . . . . . . . . . . . . . . . .Display Configuration 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Unit Configuration 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .General Operation 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Demand Determination 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .Occupancy Determination 15. . . . . . . . . . . . . . . . . . . . . . . . . . .Indoor Fan Operation 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cooling Operation 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Optional Humidi--MiZerR Dehumidification System 19. . . . . .Indoor Fan Based Dehumidification 22. . . . . . . . . . . . . . . . . . .Heating Operation 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Supply Air Tempering 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Economizer Operation 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Power Exhaust 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Indoor Air Quality (IAQ) 26. . . . . . . . . . . . . . . . . . . . . . . . . . . .Pre--occupancy Purge 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Temperature Compensated Start 27. . . . . . . . . . . . . . . . . . . . . . .Linkage 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Carrier Comfort NetworkR (CCN) Operation 28. . . . . . . . . . . .BACnet Network Operation 28. . . . . . . . . . . . . . . . . . . . . . . . .Alarm Handling 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TROUBLESHOOTING 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Complete Unit Stoppage 29. . . . . . . . . . . . . . . . . . . . . . . . . . . .Restart Procedure 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Faults and Alerts 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Control Module Communication 36. . . . . . . . . . . . . . . . . . . . . .Communication Failures 36. . . . . . . . . . . . . . . . . . . . . . . . . . . .Cooling Troubleshooting 37. . . . . . . . . . . . . . . . . . . . . . . . . . . .Humidi--MiZer System Troubleshooting 38. . . . . . . . . . . . . . . .Economizer Troubleshooting 40. . . . . . . . . . . . . . . . . . . . . . . . .Heating Troubleshooting 41. . . . . . . . . . . . . . . . . . . . . . . . . . . .Phase Protection 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Thermistor Troubleshooting 44. . . . . . . . . . . . . . . . . . . . . . . . .Sensor Trim 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Transducer Troubleshooting 44. . . . . . . . . . . . . . . . . . . . . . . . .MAJOR SYSTEM COMPONENTS 49. . . . . . . . . . . . . . . . . . . .General 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Main Base Board (MBB) 55. . . . . . . . . . . . . . . . . . . . . . . . . . . .Input--Output Board (IOB) 57. . . . . . . . . . . . . . . . . . . . . . . . . .Integrated Gas Control (IGC) Board 58. . . . . . . . . . . . . . . . . . .Protective Devices 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Space Mounted Sensors 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . .Variable Frequency Drive (VFD) 61. . . . . . . . . . . . . . . . . . . . . .LC 04--06 Variable Frequency Drive (ABB VFD) 61. . . . . . .LC 07--26 Variable Frequency Drive (Danfoss VFD) 65. . . . .Carrier Comfort NetworkR (CCN) Interface 74. . . . . . . . . . . . .APPENDIX A: SystemVut Controller Display 76. . . . . . . . . . .APPENDIX B: SystemVu Controller Text Point Reference 97. . .APPENDIX C: Navigatort Display 98. . . . . . . . . . . . . . . . . . . .APPENDIX D: SystemVu Controller CCN Tables 117. . . . . . . . .APPENDIX E: BACnet Points List 142. . . . . . . . . . . . . . . . . . . .CONTROL SET POINT AND CONFIGURATION LOG 153. . .UNIT START--UP CHECKLIST 163. . . . . . . . . . . . . . . . . . . . . .SAFETY CONSIDERATIONSInstallation and servicing of air-conditioning equipment can behazardous due to system pressure and electrical components. Onlytrained and qualified service personnel should install, repair, orservice air-conditioning equipment. Untrained personnel canperform the basic maintenance functions of replacing filters.Trained service personnel should perform all other operations.When working on air-conditioning equipment, observe precautions inthe literature, tags and labels attached to the unit, and other safetyprecautions that may apply. Follow all safety codes. Wear safetyglasses and work gloves. Use quenching cloth for unbrazingoperations. Have fire extinguishers available for all brazing operations.Follow all safety codes. Wear safety glasses and work gloves. Havefire extinguisher available. Read these instructions thoroughly andfollow all warnings or cautions attached to the unit. Consult localbuilding codes and National Electrical Code (NEC) for specialrequirements.Recognize safety information. This is the safety--alert symbol .When you see this symbol on the unit and in instructions ormanuals, be alert to the potential for personal injury.Understand the signal words DANGER, WARNING, and CAUTION.These words are used with the safety--alert symbol. DANGERidentifies the most serious hazards which will result in severe personalinjury or death. WARNING signifies a hazard which could result inpersonal injury or death. CAUTION is used to identify unsafepractices which may result in minor personal injury or product andproperty damage. NOTE is used to highlight suggestions which willresult in enhanced installation, reliability, or operation.ELECTRICAL SHOCK HAZARDFailure to follow this warning could cause personal injuryor death.Before performing service or maintenance operations onunit, turn off main power switch to unit and install lockouttag. Ensure electrical service to rooftop unit agrees withvoltage and amperage listed on the unit rating plate.! WARNING