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CONTENTS (cont)
Page
Head Pressure Control
. . . . . . . . . . . . . . . . . . . . . . . . . . 11
• GENERAL
• AIR-COOLED UNITS (30GXN,R)
• WATER-COOLED UNITS (30HXC)
• CONDENSERLESS UNITS (30HXA)
• 09DK AIR-COOLED CONDENSERS
• 09AZ AIR-COOLED CONDENSERS
• OPERATION SEQUENCE
• VARIABLE SPEED FAN CONTROL
• ADJUSTING PID ROUTINES
Control Methods
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
• SWITCH
• 7-DAY SCHEDULE
• OCCUPANCY
• CCN
Cooling Setpoint Select
. . . . . . . . . . . . . . . . . . . . . . . . . 17
Ice Mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Cooler and Condenser (30HXC)
Pump Control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
• COOLER PUMP CONTROL
• CONDENSER PUMP CONTROL
Flow Sensor
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Cooler Heater Control
. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Oil Heater Control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Navigator Display Module Usage
. . . . . . . . . . . . . . . . 18
Service Test
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Configuring and Operating Dual Chiller
Control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Alarms/Alerts
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Run Hours and Starts
. . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Temperature Reset
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Demand Limit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
• DEMAND LIMIT (2-Stage Switch Controlled)
• EXTERNALLY POWERED DEMAND LIMIT
• DEMAND LIMIT (CCN Loadshed Controlled)
Cooling Set Point (4 to 20 mA)
. . . . . . . . . . . . . . . . . . . 39
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . . . . . . . 41-51
Checking Display Codes
. . . . . . . . . . . . . . . . . . . . . . . . 41
Unit Shutoff
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Complete Unit Stoppage
. . . . . . . . . . . . . . . . . . . . . . . . 41
Single Circuit Stoppage
. . . . . . . . . . . . . . . . . . . . . . . . . 41
Restart Procedure
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
• POWER FAILURE EXTERNAL TO THE UNIT
Alarms and Alerts
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Compressor Alarm/Alert Circuit
. . . . . . . . . . . . . . . . . 42
EXV Troubleshooting Procedure
. . . . . . . . . . . . . . . . . 50
• INSPECTING/OPENING ELECTRONIC
EXPANSION VALVES
• BRAZED-PLATE ECONOMIZERS
SERVICE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52-71
Servicing Coolers and Condensers
. . . . . . . . . . . . . . 52
• TUBE PLUGGING
• RETUBING
• TIGHTENING COOLER/CONDENSER HEAD BOLTS
Inspecting/Cleaning Heat Exchangers
. . . . . . . . . . . 52
• COOLERS
• CONDENSERS (30HX Only)
Water Treatment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Condenser Coils (30GXN,R Only)
. . . . . . . . . . . . . . . . 53
• COIL CLEANING
• CLEANING E-COATED COILS
Condenser Fans (30GXN,R Only)
. . . . . . . . . . . . . . . . 54
Refrigerant Charging/Adding Charge
. . . . . . . . . . . . 55
Oil Charging/Low Oil Recharging
. . . . . . . . . . . . . . . . 56
Oil Filter Maintenance
. . . . . . . . . . . . . . . . . . . . . . . . . . . 57
• REPLACING THE EXTERNAL OIL FILTER
• REPLACING THE INTERNAL OIL FILTER
Compressor Changeout Sequence
. . . . . . . . . . . . . . 57
Page
• BURNOUT CLEAN-UP PROCEDURE
Moisture-Liquid Indicator
. . . . . . . . . . . . . . . . . . . . . . . . 59
Filter Drier
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Liquid Line Service Valve
. . . . . . . . . . . . . . . . . . . . . . . . 59
Thermistors
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
• LOCATION
• THERMISTOR REPLACEMENT
Pressure Transducers
. . . . . . . . . . . . . . . . . . . . . . . . . . . 65
• TROUBLESHOOTING
• FLOW SENSOR
Safety Devices
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
• COMPRESSOR PROTECTION
• OIL SEPARATOR HEATERS (30GX)
• COOLER PROTECTION
Relief Devices
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
• PRESSURE RELIEF VALVES
Control Modules
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
• MAIN BASE BOARD (MBB), SCREW COMPRESSOR
BOARD (SCB), EXPANSION VALVE BOARD (EXV),
ENERGY MANAGEMENT MODULE (EMM),
COMFORT
LINK™ COMPRESSOR PROTECTION
BOARD (CCP), AND THE NAVIGATOR
• RED LED
• GREEN LED
• YELLOW LED
Carrier Comfort Network (CCN) Interface
. . . . . . . . 69
Replacing Defective Processor Module
. . . . . . . . . . 69
Winter Shutdown Preparation
. . . . . . . . . . . . . . . . . . . 70
Maintenance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
PRE-START-UP PROCEDURE
. . . . . . . . . . . . . . . . . . . . 71
System Check
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
START-UP AND OPERATION
. . . . . . . . . . . . . . . . . . 71,72
Actual Start-up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Operating Sequence
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
FIELD WIRING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72-74
APPENDIX A
(Compressor Must Trip Amps)
. . . . . . . . . . . . . 75-84
APPENDIX B
(Capacity Loading Sequence)
. . . . . . . . . . . . . . 85-89
APPENDIX C (Available Accessories)
. . . . . . . . . 90,91
APPENDIX D (Building Interface)
. . . . . . . . . . . . . 92-94
APPENDIX E (Cooler and
Condenser Pressure Drop)
. . . . . . . . . . . . . . . . 95-100
APPENDIX F
(Typical System Components)
. . . . . . . . . . . 101-112
APPENDIX G (CCN Configuration)
. . . . . . . . . . 113-125
APPENDIX H (30GXN,R Duplex Combinations)
. . 126
APPENDIX I (Motormaster® V
Operation Instructions)
. . . . . . . . . . . . . . . . . . 127-129
APPENDIX J (Maintenance Log)
. . . . . . . . . . . . . . . . 130
START-UP CHECKLIST (For 30GX,HX
Liquid Chiller)
. . . . . . . . . . . . . . . . . . . . . . .CL-1 to CL-10
GENERAL
This publication contains Controls Start-Up, Service, Oper-
ation and Troubleshooting data for the 30GXN,R080-528 and
30HXA,C076-271 screw chillers.
Circuits are identified as circuits A and B, and compressors
are identified as A1 or A2 in circuit A, and B1 or B2 in
circuit B. Refer to Appendix H for Duplex unit combinations.
The 30GXN,GXR,HX Series chillers feature microproces-
sor-based electronic controls and electronic expansion valves
(EXV) in each refrigeration circuit.
IMPORTANT: These units use refrigerant R-134a.
Compressor oil used with R-134a is Castrol Icematic
SW-220, Carrier Specification #PP47-32.