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48/50PD05,06
Single Package Displacement Ventilation
or Single Zo ne Va riable A irflow R ooftop Units
Electric Cooling/Gas Heating with PURONR (R--410A)
Refrigerant and COMFORTLinkt 1.x Contr ols
Controls, Start--Up, Operation, Service and
Troubleshooting Instructions
TABLE OF CONTENTS
Page
SAFETY CONSIDERATIONS 2.........................
GENERAL 3.........................................
BASIC CONTROL USAGE 3...........................
ComfortLinkt Control 3..............................
Scrolling Marquee 3..................................
Accessory Navigator Display 3..........................
Operation 3.........................................
System Pilott Device 4...............................
CCN Tables and Display 4.............................
Conventions Used in This Manual 5......................
START-- UP 5.........................................
Unit Preparation 5....................................
Compressor Mounting 5...............................
Refrigerant Service Ports 5.............................
Crankcase Heater(s) 5.................................
Compressor Rotation 5................................
Power Supply 6.....................................
Internal Wiring 6.....................................
Evaporator Fan 6....................................
Condenser Fans and Motors 6...........................
Return--Air Filters 6..................................
Outdoor--Air Inlet Screens 6............................
Accessory Installation 7...............................
Orifice Change (48PD Only) 7..........................
Gas Heat (48PD Only) 7...............................
CONTROLS QUICK SET--UP 7.........................
Control Set Point and Configuration Log 7................
Standard Unit Control 7...............................
CCN Communication 8...............................
Accessories 8.......................................
Programming Operating Schedules 10....................
SERVICE TEST 10....................................
Independent Outputs 10...............................
Fan Test 10.........................................
Cooling Test 11.....................................
Heating Test 11......................................
THIRD PARTY CONTROL 11..........................
Remote Occupancy 11................................
Fire Shutdown 11....................................
Alarm Output 11.....................................
Economizer Monitoring 11.............................
Economizer Damper Control 11.........................
CONTROLS OPERATION 11...........................
Display Configuration 11..............................
Modes 12..........................................
Unit Configuration 12.................................
General Operating Sequence 13.........................
Occupancy Determination 13
...........................
Compressor Operation 14..............................
Indoor Fan Operation 14...............................
Outdoor Fan Operation 15.............................
Economizer Operation 15..............................
Indoor Air Quality (IAQ) 1 6............................
Cooling Modes 17...................................
Heating Modes 20....................................
Temperature Compensated Start 22.......................
Carrier Comfort Network (CCN)R Configuration 23.........
Demand Limit 23....................................
Alarm Handling 24...................................
TROUBLESHOOTING 24..............................
Complete Unit Stoppage 24............................
Restart Procedure 24..................................
Control Module Communication 24......................
Communication Failures 25............................
Alarms and Alerts 25.................................
Cooling Troubleshooting 30............................
Digital Scroll Controller (DSC) Troubleshooting 31..........
Economizer Troubleshooting 33.........................
Heating Troubleshooting 34............................
Variable Frequency Drive (VFD) Troubleshooting 34........
Phase Loss Protection 34..............................
Thermistor Troubleshooting 37.........................
Transducer Troubleshooting 38.........................
Forcing Inputs and Outputs 38..........................
MAJOR SYSTEM COMPONENTS 42....................
General 42.........................................
Main Base Board (MBB) 47............................
Economizer Control Board (ECB) 49.....................
Modulation Board (AUX1) 51..........................
Digital Scroll Control Board (DSC) 52....................