Sterling 882.93092.00 specifications Remote Air-Cooled Chiller Condensers

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Remote Air-Cooled Chiller Condensers

Remote air-cooled portable chillers are shipped with nitrogen holding charge and a full charge of oil (excluding the amount needed for field piping). The remote air condenser is shipped with a dry nitrogen charge. Verify that the holding charge has not been lost prior to installation. If there is no pressure, leak test the unit and repair before installing the interconnecting refrigerant piping. Read this entire section before installation.

Note: Piping should be type “L” or type “K” refrigerant grade copper tubing only. Proper sizing and installation has a significant effect on system performance, reliability, and safety.

Interconnecting Refrigerant Piping. The chiller and condenser refrigerant lines are terminated with a cap and brazed closed. Use a tube cutter to remove caps.

Caution! Do not use a saw to remove the end caps because this will allow copper chips to contaminate the system.

A certified refrigeration contractor need only to install the interconnecting refrigerant piping between the chiller and the outdoor air-cooled condenser. This piping must be properly sized, type “L” or type “K” refrigerant grade tubing, high temperature brazed, Install a customer supplied 650 psi approved refrigerant relief valve in the discharge line at the condenser, following all codes.

When brazing copper joints, flow dry nitrogen through the system to prevent carbon/scale formation, which causes contamination. Isolate the refrigerant lines from the building, preventing transfer of line vibration to the structure. Do not secure the lines rigidly.

Leak check and evacuate the system down to 400 microns. A decay of 50 microns after one hour is acceptable.

Warning! To prevent injury or death due to explosion and/or inhalation of phosgene gas, purge system thoroughly while brazing refrigerant piping connections. Use a pressure regulator in the line between the unit and the high-pressure nitrogen cylinder to avoid over-pressurization and possible explosion.

System Configuration. The system can be configured in any of the arrangements shown on page 49 of the Appendix. The configuration and distance between the chiller and the condenser affects pipe size, refrigerant charge, oil return, and oil charge. Therefore there are limitations that must be adhered to for reliable and optimal operation.

•Leaving water temperature affects discharge line size. Be sure to inform the installing contractor of the leaving water temperature range in which the chiller will be operating

•The total distance between the chiller and condenser must not exceed 200 feet or 300 equivalent pipe feet

•Discharge line risers cannot exceed an elevation difference greater than 100 feet without a 2% efficiency decrease.

•Refer to page 49 of the Appendix for the location of traps.

•Refrigeration lines must not be crossed, i.e., chiller liquid lines are to be piped to condenser liquid lines.

Sizing Refrigerant Lines. To determine field installed liquid and discharge line sizes, first establish the equivalent length of pipe for each line, valve, and elbow. Chiller capacity and

GP Series Portable Chillers

Chapter 3: Installation

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Contents GP Series Portable Chillers Shipping Information Table of Contents Operation How to Use This Manual SafetySafety Symbols Used in this Manual Responsibility Functional Description Models Covered in This ManualGeneral Description Chilled Water CircuitMechanical Features Standard FeaturesElectrical Features Safety Devices and Interlocks Refrigeration FeaturesController Features Other FeaturesOptional Features Flow SwitchHigh Pressure Cutout Remote Start/Stop InterlockMounting Features Optional Pump Amperages Voltage Construction Full Load Amps Uncrating InstallationElectrical Connections Process Water Connections Bypass Valve ConsiderationsGalvanic Corrosion Considerations Water Treatment ConsiderationsWater-Cooled Chiller Condensers Condenser ConsiderationsAir-Cooled Chiller Condensers Remote Air-Cooled Chiller Condensers Equivalent Length in Feet for Valves and Fittings Discharge Line Sizing Refrigerant Charge Determination Three-Phase Compressors Checking Motor DirectionWater Pumps Condenser FanWater Reservoir Part Number DescriptionPump Automatic Water Make-Up Option Finishing Setup Setting Up PasswordsInitial Start-Up Page Page Operation Panel Buttons, Indicator Lights, and SwitchesMicroprocessor Controller Main Status Screen Operator Setpoints Screen Status Screens GP Series Portable Chillers Operation Access Levels Controller Setpoints Menu Screen Alarms Optional CommunicationsGP Series Portable Chillers Operation Maintenance Filter CleaningLubrication Maintaining the CondenserMaintaining the Evaporator Preventative Maintenance ServiceEvaporator Process Piping Y-Strainer Troubleshooting GP Series Portable Chillers TroubleshootingGP Series Portable Chillers Troubleshooting Warranty Returns AppendixReturned Material Policy Credit ReturnsService Department Technical AssistanceParts Department Sales DepartmentSpecifications Air-Cooled Portable ChillersPAC-40 Water-Cooled Portable Chillers PWC-20PWC-40 Pump Curves, Flow, and Pressure Considerations Hertz Pump CurvesALL 50 Hz Capacity liter/minCalculating Chiller Nominal Flow and Pressure to Process Remote Air-Cooled Chiller Configurations Typical Ductwork for Air-Cooled Chillers Page GP Series Portable Chillers Appendix Piping Diagrams GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix GP Series Portable Chillers Appendix
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882.93092.00 specifications

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