Sterling 882.93092.00 specifications Optional Features, High Pressure Cutout, Flow Switch

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Caution! Energize the crankcase heater for at least 24 hours before initial startup to drive dissolved refrigerant from the compressor oil. Failure to do so will damage the compressor.

High Pressure Cutout

This electro-mechanical cutout device opens the compressor control circuit if the refrigeration system compressor discharge pressure exceeds 575 psi..

Note: The high-pressure cutout is a manual reset device typically mounted on the compressor discharge line inside the mechanical cabinet. Call a refrigeration service technician to analyze the problem and reset the control.

Low Pressure Cutout (no switch but done through the transducer)

There are two pressure transducers in the refrigeration piping – one on the suction line before the compressor and one on the discharge line after the compressor. Within the program there are four settings that warn and fault based on these two pressure transducers. The low suction warning is set for 110 psig (758 kPa), and the compressor will fault at 100 psig (689 kPa).

The low discharge warning is set for 200 psig (1,379 kPa), and the compressor will fault at 180 psig (1,241 kPa). To prevent nuisance tripping there are delays built in to the program.

Note: Call a refrigeration service technician to analyze the problem to prevent recurring low pressure faults.

Flow Switch

The thermal dispersion flow switch cutout device, mounted in the process piping, shuts down the chiller if it senses that the water/glycol flow rate through the evaporator has dropped below an acceptable level. The flow switch opens the control circuit and shuts down the pumps and the chiller.

Remote Start/Stop Interlock

An additional contact is provided to allow the remote starting or stopping of the chiller. To use this feature, remove the jumper between terminals 1 and 23, and supply a switch or dry contact interlock connected in series between these two terminals. Refer to the schematic inside the control enclosure door.

2-5 Optional Features

Options marked with “*” indicate options that can be factory installed or retrofitted in the field.

Automatic Water Make-Up*.Not available on chillers less reservoir tank. Includes an electric water solenoid valve, a level sensing pressure switch mounted in the reservoir tank, and the necessary internal piping to connect the chiller to a make-up water source. See Appendix for typical piping diagrams.

Caution! Customer piping must provide backflow protection and venting of tank to atmosphere to prevent over-pressurization of the reservoir tank (not needed for open tank). See Error! Reference source not found. on page Error! Bookmark not defined..

GP Series Portable Chillers

Chapter 2: Functional Description

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Contents GP Series Portable Chillers Shipping Information Table of Contents Appendix How to Use This Manual SafetySafety Symbols Used in this Manual Responsibility General Description Functional DescriptionModels Covered in This Manual Chilled Water CircuitMechanical Features Standard FeaturesElectrical 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 Uncrating InstallationElectrical Connections 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 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 Status Screens Operator Setpoints ScreenPage Access Levels Controller Setpoints Alarms Optional CommunicationsPage GP Series Portable Chillers Operation Lubrication MaintenanceFilter Cleaning Maintaining the CondenserMaintaining the Evaporator Preventative Maintenance ServiceEvaporator Process Piping Y-Strainer 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-20 Water-Cooled Portable ChillersPWC-30 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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882.93092.00 specifications

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