CONTENTS (cont)
Page
•LEAD/LAG DETERMINATION
•CAPACITY SEQUENCE DETERMINATION
•CAPACITY CONTROL OVERRIDES
Head Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . 27
•COMFORTLINK™ UNITS (With EXV)
•UNITS WITH TXV
Pumpout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
•EXV UNITS
•TXV UNITS
Marquee Display Usage . . . . . . . . . . . . . . . . . . . . . . . . . 29 Service Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Configuring and Operating Dual Chiller
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Temperature Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Cooling Set Point (4 to 20 mA). . . . . . . . . . . . . . . . . . . 45 Demand Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
•DEMAND LIMIT (2-Stage Switch Controlled)
•EXTERNALLY POWERED DEMAND LIMIT (4 to 20 mA Controlled)
•DEMAND LIMIT (CCN Loadshed Controlled)
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 47-52
Compressor Protection Control System
(CPCS) Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Compressor Ground Current (CGF) Board (30GTN,R and 30GUN,R130-210, 230A-315A, and 330A/B-420A/B) . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
EXV Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
•STEP 1 — CHECK PROCESSOR EXV OUTPUTS
•STEP 2 — CHECK EXV WIRING
•STEP 3 — CHECK RESISTANCE OF EXV MOTOR WINDINGS
•STEP 4 — CHECK THERMISTORS THAT CONTROL EXV
•STEP 5 — CHECK OPERATION OF THE EXV
Alarms and Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53-65
Electronic Components . . . . . . . . . . . . . . . . . . . . . . . . . 53
Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
•COMPRESSOR REMOVAL
•OIL CHARGE
Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
•COOLER REMOVAL
•REPLACING COOLER
•SERVICING THE COOLER
Condenser Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Condenser Fans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Refrigerant Feed Components. . . . . . . . . . . . . . . . . . . 58
•ELECTRONIC EXPANSION VALVE (EXV)
•MOISTURE-LIQUID INDICATOR
•FILTER DRIER
•LIQUID LINE SOLENOID VALVE
•LIQUID LINE SERVICE VALVE
Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
•LOCATION
•REPLACING THERMISTOR T2
•REPLACING THERMISTORS T1,T5,T6,T7, AND T8
•THERMISTORS T3 AND T4
•THERMISTOR/TEMPERATURE SENSOR CHECK
Page Safety Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
•COMPRESSOR PROTECTION
•LOW OIL PRESSURE PROTECTION
•CRANKCASE HEATERS
•COOLER PROTECTION
Relief Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
•HIGH-SIDE PROTECTION
•LOW-SIDE PROTECTION
•PRESSURE RELIEF VALVES
Other Safeties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
START-UP AND OPERATION. . . . . . . . . . . . . . . . . . 66,67
Actual Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Operating Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
•TEMPERATURES
•VOLTAGE
•MINIMUM FLUID LOOP VOLUME
•FLOW RATE REQUIREMENTS
Operation Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Refrigerant Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
FIELD WIRING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67-70 APPENDIX A — CCN TABLES . . . . . . . . . . . . . . . . 71-79
APPENDIX B — FLUID PRESSURE DROP CURVES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80-87
START-UPCHECKLIST . . . . . . . . . . . . . . . . .CL-1 to CL-8
GENERAL
The model 30GTN,R chillers are air-cooled chillers utiliz- ing refrigerant R-22. The model 30GUN,R chillers are air- cooled chillers utilizing refrigerant R-134a.
Unit sizes 230-420 are modular units which are shipped as separate sections (modules A and B). Installation instructions specific to these units are shipped inside the individual mod- ules. See Tables 1A and 1B for a listing of unit sizes and modu- lar combinations. For modules 230B-315B, follow all general instructions as noted for unit sizes 080-110. For all remaining modules, follow instructions for unit sizes 130-210.
INTRODUCTION
This publication contains Start-Up, Service, Controls, Oper- ation, and Troubleshooting information for the 30GTN,R040- 420 and 30GUN,R040-420 liquid chillers with ComfortLink controls.
The 30GTN,R and 30GUN,R040-420 chillers are equipped with electronic expansion valves (EXVs) or, on size 040-110 FIOP (factory-installed option) units, conventional thermostat- ic expansion valves (TXVs). The size 040-110 FIOP chillers are also equipped with liquid line solenoid valves (LLSV).
NOTE: TXVs are not available on modular units.
Differences in operations and controls between standard and 040-110 FIOP units are noted in appropriate sections in this publication. Refer to the Installation Instructions and the Wiring Diagrams for the appropriate unit for further details.
