Carrier Air Conditioner specifications CONTENTS cont, General, Introduction

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.

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