Condenserless and Water-Cooled Chillers with ComfortLink Controls 50/60 Hz, Series 9 - Controls, Start-Up, Operation, Service, and Troubleshooting - 30HX-2T

Oct 30, 2026

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Manual for condenserless, water-cooled chillers using ComfortLink controls (50/60 Hz, Series 9). Covers safety considerations, conventions, major system components, control operation such as EXV, oil pumps, sensors, compressor protection, capacity and head pressure control, and control methods including set point selection and ice mode. Provides start-up, shutdown, field wiring, alarm/alert handling, service test, dual-chiller operation, and troubleshooting with display codes. Includes pre-start-up and start-up procedures, maintenance guidance, water treatment, refrigerant and oil charging, module replacement, and extensive appendices with capacity loading sequences, accessories, CCN configuration, BACnet option, and wiring diagrams.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages140

Reading Time5 h 53 min

AccessFree to download

Safety Considerations

General

Conventions Used in This Manual

Major System Components

Main Base Board (MBB)

Auxiliary (AUX) Board

Electronic Expansion Valve (EXV) Board

Compressor Protection Module (CPM)

Energy Management Module (EMM)

Enable/Off/Remote Contact Switch

Emergency On/Off Switch

Board Addresses

Control Module Status LEDs

Carrier Comfort Network (CCN) Interface

Controls Operation

Electronic Expansion Valve (EXV)

Oil Pumps

Motor Cooling

Sensors

Compressor Protection Module (CPM)

Starting Options and Capacity Control

Head Pressure Control

Control Methods

Cooling Set Point Select and Ice Mode

Pump Control (30HXC)

Navigator™ Display Module Usage

Service Test

Configuring and Operating Dual Chiller Control

Alarms/Alerts

Run Hours and Starts

Temperature Reset

Demand Limit

Cooling Set Point (4 to 20 mA)

Troubleshooting

Checking Display Codes

Unit Shutoff and Restart Procedure

Alarms and Alerts

EXV Troubleshooting Procedure

Servicing and Maintenance Tasks

Refrigerant Charging and Oil Recharging

Pre-Start-Up Procedure

Start-Up and Operation

Actual Start-Up

Operating Sequence

Field Wiring

Appendices

Capacity Loading Sequence

Available Accessories

Cooler and Condenser Pressure Drop

Typical System Components

CCN Configuration

Maintenance Summary and Log Sheets

BACnet Option

Wiring Diagrams

Start-Up Checklist

30HXA,HXC076-271 Condenserless and Water-Cooled Chillers with ComfortLink Controls 50/60 Hz, Series 9 Controls, Start-Up, Operation, Service, and Troubleshooting CONTENTS Page SAFETY CONSIDERATIONS ................... 2 GENERAL ................................... 2 Conventions Used in This Manual ............... 2 MAJOR SYSTEM COMPONENTS ................ 3 Main Base Board (MBB) ....................... 3 Auxiliary (AUX) Board ......................... 3 Electronic Expansion Valve (EXV) Board ......... 3 Compressor Protection Module (CPM) ........... 3 Energy Management Module (EMM) ............. 3 Enable/Off/Remote Contact Switch .............. 3 Emergency On/Off Switch ..................... 3 Board Addresses ............................ 3 Control Module Status LEDs ................... 3 Carrier Comfort Network (CCN) Interface ......... 3 CONTROLS OPERATION ...................... 4 Electronic Expansion Valve (EXV) .............. 4 Oil Pumps .................................. 5 Motor Cooling ............................... 5 Back Pressure Valve (30HXA only) .............. 5 Sensors .................................... 5 Compressor Protection Module (CPM) ........... 5 Wye-Delta vs Across-the-Line (XL) Starting Option .. 9 Capacity Control ............................ 10 Head Pressure Control ....................... 13 Control Methods ............................ 16 Cooling Set Point Select ..................... 17 Ice Mode ................................... 17 Cooler and Condenser (30HXC) Pump Control ... 17 Navigator™ Display Module Usage ............. 17 Service Test ................................ 18 Configuring and Operating Dual Chiller Control .. 37 Alarms/Alerts ............................... 37 Run Hours and Starts ........................ 37 Temperature Reset .......................... 37 Demand Limit .............................. 38 Cooling Set Point (4 to 20 mA) ................. 39 TROUBLESHOOTING ........................ 40 Checking Display Codes ..................... 40 Unit Shutoff ................................ 40 Complete Unit Stoppage ..................... 40 Single Circuit Stoppage ...................... 40 Restart Procedure ........................... 40 Alarms and Alerts ...........................40 Compressor Alarm/Alert Circuit ................40 EXV Troubleshooting Procedure ...............48 Servicing Coolers and Condensers ...............50 Inspecting/Cleaning Heat Exchangers ..........52 Water Treatment ............................52 Refrigerant Charging/Adding Charge ...........52 Oil Charging/Low Oil Recharging ...............53 Oil Filter Maintenance ........................54 Compressor Changeout Sequence .............54 Moisture-Liquid Indicator .....................56 Filter Drier .................................. 56 Liquid Line Service Valve .....................56 Thermistors ................................56 Pressure Transducers ........................63 Chilled Water Flow Switch ....................64 Flow Sensor ................................65 Safety Devices ..............................66 Relief Devices ..............................66 Control Modules ............................66 Carrier Comfort Network (CCN) Interface ........68 Replacing Defective Modules ..................68 Winter Shutdown Preparation .................68 Maintenance ................................69 PRE-START-UP PROCEDURE .................69 System Check ..............................69 START-UP AND OPERATION ..................70 Actual Start-Up .................................70 Operating Sequence ............................70 FIELD WIRING ..............................70 APPENDIX A —CAPACITY LOADING SEQUENCE .............................. 73 APPENDIX B —AVAILABLE ACCESSORIES..... 78 APPENDIX C —COOLER AND CONDENSER PRESSURE DROP................

FAQs

What safety precautions does the manual require before installing, starting up, or servicing the equipment?

Installation, start-up, and servicing can be hazardous due to system pressures, electrical components, and location. Only trained, qualified personnel should work on the unit, and all applicable safety codes plus PPE such as safety glasses and gloves are required.

How should power be handled during installation and service?

Shut off all power to the equipment during installation and service, and note there may be more than one disconnect switch. Tag each disconnect location so others do not restore power until work is completed.

What procedure does the manual emphasize for removing components that contain oil and refrigerant under pressure?

Do not use a torch. Shut off electrical power, recover refrigerant to relieve all pressure using both high- and low-pressure ports, and use protective gloves and goggles while proceeding with component removal.

Oct 30, 2026

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