Carrier 30GTN Service And Troubleshooting Manual

Also see for 30GTN: Product data Installation instructions Installation instructions

Carrier 30GTN Service And Troubleshooting Manual Manual pdf 2 page image

CONTENTS (cont)PageHead Pressure Control . . . . . . . . . . . . . . . . . . . . . . 27• COMFORTLINK™ UNITS (With EXV)• UNITS WITH TXVPumpout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27• EXV UNITS• TXV UNITSMarquee Display Usage . . . . . . . . . . . . . . . . . . . . . 29Service Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Configuring and Operating Dual ChillerControl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Temperature Reset . . . . . . . . . . . . . . . . . . . . . . . . . . 43Demand Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45• DEMAND LIMIT (2-Stage Switch Controlled)• EXTERNALLY POWERED DEMAND LIMIT(4 to 20 mA Controlled)• DEMAND LIMIT (CCN Loadshed Controlled)TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 46-51Compressor Protection Control System(CPCS) Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Compressor Ground Current (CGC) Board(30GTN,R130-210, 230A-315A, and330A/B-420A/B) . . . . . . . . . . . . . . . . . . . . . . . . . . . 46EXV Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 46• STEP 1 − CHECK PROCESSOR EXV OUTPUTS• STEP 2 — CHECK EXV WIRING• STEP 3 — CHECK RESISTANCE OF EXV MOTORWINDINGS• STEP 4 — CHECK THERMISTORS THATCONTROL EXV• STEP 5 — CHECK OPERATION OF THE EXVAlarms and Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . 47SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52-64Electronic Components . . . . . . . . . . . . . . . . . . . . . 52Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52• COMPRESSOR REMOVAL• OIL CHARGECooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52• COOLER REMOVAL• REPLACING COOLER• SERVICING THE COOLERCondenser Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Condenser Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Refrigerant Feed Components . . . . . . . . . . . . . . . 56• ELECTRONIC EXPANSION VALVE (EXV)• MOISTURE-LIQUID INDICATOR• FILTER DRIER• LIQUID LINE SOLENOID VALVE• LIQUID LINE SERVICE VALVEThermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57• LOCATION• REPLACING THERMISTOR T2• REPLACING THERMISTORS T1,T5,T6,T7, AND T8• THERMISTORS T3 AND T4• THERMISTOR/TEMPERATURE SENSOR CHECKSafety Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63• COMPRESSOR PROTECTION• LOW OIL PRESSURE PROTECTION• CRANKCASE HEATERS• COOLER PROTECTIONRelief Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64• HIGH-SIDE PROTECTION• LOW-SIDE PROTECTION• PRESSURE RELIEF VALVESOther Safeties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64START-UP AND OPERATION . . . . . . . . . . . . . . . 65,66Actual Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65PageOperating Limitations . . . . . . . . . . . . . . . . . . . . . . . 65• TEMPERATURES• VOLTAGE• MINIMUM FLUID LOOP VOLUME• FLOW RATE REQUIREMENTSOperation Sequence . . . . . . . . . . . . . . . . . . . . . . . . 66APPENDIX A — CCN TABLES . . . . . . . . . . . . . . 67-74START-UP CHECKLIST . . . . . . . . . . . . . . CL-1 to CL-8GENERALUnit sizes 230-420 are modular units which are shippedas separate sections (modules A and B). Installation instruc-tions specific to these units are shipped inside the individualmodules. See Table 1 for a listing of unit sizes and modularcombinations. For modules 230B-315B, follow all generalinstructions as noted for unit sizes 080-110. For all remain-ing modules, follow instructions for unit sizes 130-210.INTRODUCTIONThis publication contains Start-Up, Service, Controls, Op-eration, and Troubleshooting information for the 30GTN,R040-420 liquid chillers with ComfortLink controls.The 30GTN,R chillers are equipped with electronic ex-pansion valves (EXVs) or, on size 040-110 FIOP (factory-installed option) units, conventional thermostatic expansionvalves (TXVs). The size 040-110 FIOP chillers are alsoequipped with liquid line solenoid valves (LLSV).NOTE: TXVs are not available on modular units.Differences in operations and controls between standardand 040-110 FIOP units are noted in appropriate sections inthis publication. Refer to the Installation Instructions and theWiring Diagrams for the appropriate unit for further details.This unit uses a microprocessor-based electronic con-trol system. Do not use jumpers or other tools to shortout or bypass components or otherwise depart fromrecommended procedures. Any short-to-ground of thecontrol board or accompanying wiring may destroy theboard or electrical component.Table 1 — Unit Sizes and Modular CombinationsUNIT MODEL30GTN,RNOMINALTONSSECTION AUNIT 30GTN,RSECTION BUNIT 30GTN,R40 40 — —45 45 — —50 50 — —60 60 — —70 70 — —80 80 — —90 90 — —100 100 — —110 110 — —130 125 — —150 145 — —170 160 — —190 180 — —210 200 — —230 220 150 080245 230 150 090255 240 150 100270 260 170 100290 280 190 110315 300 210 110330 325 170 170360 350 190 190/170*390 380 210 190420 400 210 210*60 Hz units/50 Hz units.2