Sterling 882.93092.00 Safety Devices and Interlocks, Refrigeration Features, Controller Features

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•208-230/3/60, 460/3/60, 575/3/60 volt; 400/3/50 volt

Refrigeration Features

•HFC-410a refrigerant

•Electronic hot gas bypass capacity control

•High refrigerant pressure cutout switches

•Suction and discharge pressure transducers.

•High pressure spring actuated relief valve

•Multiple refrigeration access ports

•Liquid line shut-off ball valves

•Filter-dryer

•Sight glass

•Externally equalized thermal expansion valve

•Liquid line solenoid

•Compressor crankcase heater

Controller Features

•Off-the-shelf microprocessor-based PID controller with To Process, From Process and Set Point readout

•Time delay for proof of water flow/pressure (models w/pump only)

•Low refrigerant pressure time delay for low ambient start-up on remote air-cooled and air-cooled chillers with the variable-speed fan option.

•8 line x 20 character display with status, alarm, and service screens

Other Features

•One year labor warranty and one year compressor warranty

•Two year parts warranty

•Two year limited controller warranty

2-4 Safety Devices and Interlocks

Caution! Protect the system from freezing with glycol 20ºF below the leaving water temperature set point. Condensation may form inside the pump tank and dilute the mixture, therefore the freezing point should be verified periodically. See Figure 6 on page 18 for the correct mixture.

Crankcase Heater

All of the chillers are equipped with a compressor crankcase heater. It is wired through the control transformer that operates continuously whenever power is applied to the chiller.

GP Series Portable Chillers

Chapter 2: Functional Description

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Contents GP Series Portable Chillers Shipping Information Table of Contents Appendix Safety How to Use This ManualSafety Symbols Used in this Manual Responsibility Models Covered in This Manual Functional DescriptionGeneral Description Chilled Water CircuitStandard Features Mechanical FeaturesElectrical Features Refrigeration Features Safety Devices and InterlocksController Features Other FeaturesFlow Switch Optional FeaturesHigh Pressure Cutout Remote Start/Stop InterlockMounting Features Optional Pump Amperages Voltage Construction Full Load Amps Installation UncratingElectrical Connections Bypass Valve Considerations Process Water ConnectionsGalvanic Corrosion Considerations Water Treatment ConsiderationsWater-Cooled Chiller Condensers Condenser ConsiderationsAir-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 Checking Motor Direction Three-Phase CompressorsWater Pumps Condenser FanPart Number Description Water ReservoirPump Finishing Setup Setting Up Passwords Automatic Water Make-Up OptionInitial Start-Up Page Page Panel Buttons, Indicator Lights, and Switches OperationMicroprocessor Controller Main Status Screen Operator Setpoints Screen Status ScreensPage Access Levels Controller Setpoints Optional Communications AlarmsPage GP Series Portable Chillers Operation Filter Cleaning MaintenanceLubrication Maintaining the CondenserPreventative Maintenance Service Maintaining the EvaporatorEvaporator Process Piping Y-Strainer GP Series Portable Chillers Troubleshooting TroubleshootingGP Series Portable Chillers Troubleshooting Appendix Warranty ReturnsReturned Material Policy Credit ReturnsTechnical Assistance Service DepartmentParts Department Sales DepartmentAir-Cooled Portable Chillers SpecificationsPAC-20 PAC-30PAC-50 PAC-40GPAC-70 TON GPAC-140 GPAC-105GPAC-210 GPAC-175Water-Cooled Portable Chillers PWC-20PWC-30 PWC-50 PWC-40GPWC-70 GPWC-140 GPWC-105GPWC-210 GPWC-175Hertz Pump Curves Pump Curves, Flow, and Pressure ConsiderationsModel GP70 GP90 Capacity liter/min ALL 50 HzACS Chiller Pumps GPM DP PSI Pure Water at 40FRemote 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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882.93092.00 specifications

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