Safety Considerations - Carrier 48LC Series Controls, Start-Up, Operation And Troubleshooting

Programming Operating Schedules
SERVICE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Independent Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heating Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THIRD PARTY CONTROL
Cooling/Heating Control . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dehumidification Control . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Occupancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alarm Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Economizer Damper Control
CONTROLS OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Demand Determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Occupancy Determination . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Humidi- -MiZer R Dehumidification System
Indoor Fan Based Dehumidification
Heating Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Air Tempering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Economizer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Air Quality (IAQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pre- -occupancy Purge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Compensated Start
Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
R
Carrier Comfort Network (CCN) Operation
BACnet Network Operation
Alarm Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Complete Unit Stoppage . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Restart Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Faults and Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Module Communication
Communication Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Humidi- -MiZer System Troubleshooting
Economizer Troubleshooting
Heating Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phase Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermistor Troubleshooting
Sensor Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transducer Troubleshooting
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10 MAJOR SYSTEM COMPONENTS
11 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11 Main Base Board (MBB)
11 Input- -Output Board (IOB)
11 Integrated Gas Control (IGC) Board
11 Protective Devices
12 Space Mounted Sensors
12 Variable Frequency Drive (VFD)
12 LC 04- -06 Variable Frequency Drive (ABB VFD)
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LC 07- -26 Variable Frequency Drive (Danfoss VFD)
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Carrier Comfort Network
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APPENDIX A: SystemVut Controller Display
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APPENDIX B: SystemVu Controller Text Point Reference
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APPENDIX C: Navigatort Display
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APPENDIX D: SystemVu Controller CCN Tables
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APPENDIX E: BACnet Points List
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CONTROL SET POINT AND CONFIGURATION LOG
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UNIT START- -UP CHECKLIST

SAFETY CONSIDERATIONS

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Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
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trained and qualified service personnel should install, repair, or
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service air-conditioning equipment. Untrained personnel can
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perform the basic maintenance functions of replacing filters.
Trained service personnel should perform all other operations.
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When working on air-conditioning equipment, observe precautions in
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the literature, tags and labels attached to the unit, and other safety
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precautions that may apply. Follow all safety codes. Wear safety
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glasses and work gloves. Use quenching cloth for unbrazing
operations. Have fire extinguishers available for all brazing operations.
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Follow all safety codes. Wear safety glasses and work gloves. Have
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fire extinguisher available. Read these instructions thoroughly and
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follow all warnings or cautions attached to the unit. Consult local
27 building codes and National Electrical Code (NEC) for special
requirements.
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Recognize safety information. This is the safety- -alert symbol
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When you see this symbol on the unit and in instructions or
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manuals, be alert to the potential for personal injury.
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Understand the signal words DANGER, WARNING, and CAUTION.
28 These words are used with the safety- -alert symbol. DANGER
identifies the most serious hazards which will result in severe personal
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injury or death. WARNING signifies a hazard which could result in
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personal injury or death. CAUTION is used to identify unsafe
29 practices which may result in minor personal injury or product and
property damage. NOTE is used to highlight suggestions which will
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result in enhanced installation, reliability, or operation.
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ELECTRICAL SHOCK HAZARD
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Failure to follow this warning could cause personal injury
or death.
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Before performing service or maintenance operations on
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unit, turn off main power switch to unit and install lockout
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tag. Ensure electrical service to rooftop unit agrees with
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voltage and amperage listed on the unit rating plate.
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(CCN) Interface . . . . . . . . . . . . .
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WARNING
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