Sterling 882.93092.00 specifications Process Water Connections, Bypass Valve Considerations

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3-3 Process Water Connections

All of our portable chillers have two chilled water connections. The chilled water supply, labeled “To Process” is the outlet for the chilled water leading to the process being cooled. The chilled water return, labeled “From Process” is the inlet leading from the process back into the chiller to be cooled and re-circulated.

All external chilled water connections should be run full size to the process. Flow and pressure information is available in the Appendix. The largest possible openings and passages should be provided for the flow of chilled water through platens, dies, molds, or other pieces of equipment.

Note: Be sure to reduce external pressure drop as much as possible by generously sizing piping and tooling water passageways.

3-4 Bypass Valve Considerations

Our portable chillers have an internal manual bypass valve. If the flow is stopped to the process while the chiller is running, the factory-set bypass valve allows a small amount of water to flow through the chiller. This action allows the chiller to keep functioning while the flow is stopped to process. The bypass valve is not intended to provide continuous full bypass flow.

Caution! Do not attempt to adjust or otherwise tamper with the internal bypass. Your warranty will be voided.

3-5 Galvanic Corrosion Considerations

The materials used in the water circuit piping of these chillers are non-ferrous and react electro-chemically with ferrous metallic materials. Some water has dissolved minerals that greatly accelerate the reaction between dissimilar metals.

PVC or non-ferrous piping is recommended to reduce galvanic action. If iron piping must be used, use dielectric unions at the chiller, and water treatment is required.

3-6 Water Treatment Considerations

Water treatment is an integral part of the system. In some locations, water may cause large deposits of scale, erosion, algae, and/or corrosion.

Note: The use of poor quality water may result in inefficient operation, heat exchanger damage, and pump seal damage. Consult a qualified water treatment specialist to determine whether treatment is needed.

GP Series Portable Chillers

Chapter 3: Installation

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Contents GP Series Portable Chillers Shipping Information Table of Contents Appendix Safety Symbols Used in this Manual SafetyHow to Use This Manual Responsibility General Description Functional DescriptionModels Covered in This Manual Chilled Water CircuitElectrical Features Standard FeaturesMechanical Features Controller Features Safety Devices and InterlocksRefrigeration Features Other FeaturesHigh Pressure Cutout Optional FeaturesFlow Switch Remote Start/Stop InterlockMounting Features Optional Pump Amperages Voltage Construction Full Load Amps Electrical Connections InstallationUncrating Galvanic Corrosion Considerations Process Water ConnectionsBypass Valve Considerations Water Treatment ConsiderationsAir-Cooled Chiller Condensers Condenser ConsiderationsWater-Cooled Chiller Condensers Remote Air-Cooled Chiller CondensersPage Page Equivalent Length in Feet for Valves and Fittings Total Equiv GP Series Portable Chillers Installation Discharge Line Sizing Refrigerant Charge Determination Water Pumps Three-Phase CompressorsChecking Motor Direction Condenser FanWater Reservoir Part Number DescriptionPump Initial Start-Up Finishing Setup Setting Up PasswordsAutomatic Water Make-Up Option Page Page Microprocessor Controller Panel Buttons, Indicator Lights, and SwitchesOperation Main Status Screen Status Screens Operator Setpoints ScreenPage Access Levels Controller Setpoints Alarms Optional CommunicationsPage GP Series Portable Chillers Operation Lubrication MaintenanceFilter Cleaning Maintaining the CondenserEvaporator Process Piping Y-Strainer Preventative Maintenance ServiceMaintaining the Evaporator Troubleshooting GP Series Portable Chillers TroubleshootingGP Series Portable Chillers Troubleshooting Returned Material Policy Warranty ReturnsAppendix Credit ReturnsParts Department Service DepartmentTechnical Assistance Sales DepartmentPAC-20 SpecificationsAir-Cooled Portable Chillers PAC-30PAC-40 PAC-50GPAC-70 GPAC-105 TON GPAC-140GPAC-175 GPAC-210PWC-30 Water-Cooled Portable ChillersPWC-20 PWC-40 PWC-50GPWC-70 GPWC-105 GPWC-140GPWC-175 GPWC-210Pump Curves, Flow, and Pressure Considerations Hertz Pump CurvesModel GP70 GP90 ALL 50 Hz Capacity liter/minACS Chiller Pumps Pure Water at 40F GPM DP PSIRemote Air-Cooled Chiller Configurations Typical Ductwork for Air-Cooled Chillers Page 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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