Unit installation

2
Cooling Troubleshooting 32............................
Economizer Troubleshooting 33.........................
Heating Troubleshooting 34............................
Phase Loss Protection 37..............................
Thermistor Troubleshooting 37.........................
Transducer Troubleshooting 38.........................
Forcing Inputs and Outputs 38..........................
MAJOR SYSTEM COMPONENTS 41....................
General 41.........................................
Main Base Board (MBB) 47............................
Economizer Control Board (ECB) 49.....................
Integrated Gas Control (IGC) Board 51...................
Low Voltage Terminal Board 52.........................
Communication Interface Board 52......................
Central Terminal Board (CTB) 52........................
Variable Frequency Drive (VFD) 54......................
VFD Diagnostics (with Keypad) 56......................
Scrolling Marquee Display 59..........................
Accessory Navigatort Display 59.......................
Carrier Comfort Network (CCN)
R
Interface 59.............
Protective Devices 61.................................
Field--Installed Accessories 61..........................
APPENDIX -- LOCAL DISPLAY AND
CCN TABLES 64.....................................
CONTROL SET POINT AND CONFIGURATION LOG 78....
UNIT START--UP CHECKLIST 83.......................
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment. Untrained personnel can
perform the basic maintenance functions of replacing filters.
Trained service personnel should perform all other operations.
When working on air-conditioning equipment, observe precautions
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 work gloves. Use quenching cloth for unbrazing
operations. Have fire extinguishers available for all brazing
operations.
Follow all safety codes. Wear safety glasses and work gloves. Have
fire extinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult local
building codes and National Electrical Code (NEC) for special
requirements.
Recognize safety information. This is the safety--alert symbol
.
When you see this symbol on the unit and in instructions or
manuals, 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.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
unit, turn off main power switch to unit and install lockout
tag. Ensure electrical service to rooftop unit agrees with
voltage and amperage listed on the unit rating plate.
!
WARNING
UNIT DAMAGE HAZARD
Failure to follow this caution may cause equipment
damage.
This unit uses a microprocessor--based electronic control
system. Do not use jumpers or other tools to short out
components or to bypass or otherwise depart from
recommended procedures. Any short--to--ground of the
control board or accompanying wiring may destroy the
electronic modules or electrical components.
CAUTION
!
48/50LC