Sterling GP Series specifications Mounting Features

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interlock. The alarm signals anytime that a fault is recognized during the operation of the chiller.

Communications Options. RS-485 serial Modbus communications.

High Pressure Fans. Provides for an additional 1.0”WC (250 Pa) of static pressure on fan discharge. High-pressure fans are necessary and must be included in chiller installations where exiting air exhausts through ductwork.

They can be retrofitted without sheet metal modification, but will require changing out fan blades, and in some cases, fan motors and electrical components.

Variable Speed Fan. Reduces the speed of the fan based on entering air temperature and system load, allowing the chiller to operate in ambient temperatures below 60ºF (15.5ºC). This option will also reduce fan noise in ambient temperatures below 95ºF (35ºC).

Stainless Steel Reservoir. 5 hp to 15 hp models only. Manufactured from 304 stainless steel.

Mounting Features.

•Mounting rails with feet

Optional Operating Voltages. 208-230/3/60, 575/3/60, and 400/3/50 volt available

UL Labeled Electrical Subpanel. Provides for the subpanel to be listed with Underwriters Laboratory, with UL-related benefits and features.

Optional Pumps. Pump options are available for greater pressure and flow rates. A recirculation pump is required whenever process water flow is less than 1.2 gpm per ton or greater than 4.8 gpm per ton. See Figure 1 on page 12 for optional pump amperages.

NEMA 4 Electrical Enclosure. Provides for NEMA 4-level electrical enclosure protection.

GP Series Portable Chillers

Chapter 2: Functional Description

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Contents GP Series Portable Chillers Shipping Information Table of Contents Maintenance Safety Symbols Used in this Manual SafetyHow to Use This Manual Responsibility Chilled Water Circuit Functional DescriptionModels Covered in This Manual General DescriptionElectrical Features Standard FeaturesMechanical Features Other Features Safety Devices and InterlocksRefrigeration Features Controller FeaturesRemote Start/Stop Interlock Optional FeaturesFlow Switch High Pressure CutoutMounting Features Optional Pump Amperages Voltage Construction Full Load Amps Electrical Connections InstallationUncrating Water Treatment Considerations Process Water ConnectionsBypass Valve Considerations Galvanic Corrosion ConsiderationsAir-Cooled Chiller Condensers Condenser ConsiderationsWater-Cooled Chiller Condensers Condenser Fan Three-Phase CompressorsChecking Motor Direction Water PumpsPart Number Description Water ReservoirEthylene Glycol and Propylene Glycol Curves 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 Operator Setpoints Screen Status Screens Access Levels Page Controller Setpoints Menu Screen Optional Communications AlarmsGP Series Portable Chillers Operation Maintaining the Condenser MaintenanceFilter Cleaning LubricationEvaporator Process Piping Y-Strainer Preventative Maintenance ServiceMaintaining the Evaporator GP Series Portable Chillers Troubleshooting TroubleshootingGP Series Portable Chillers Troubleshooting Credit Returns Warranty ReturnsAppendix Returned Material PolicySales Department Service DepartmentTechnical Assistance Parts DepartmentAir-Cooled Portable Chillers SpecificationsPAC-40 PWC-20 Water-Cooled Portable ChillersPWC-50 Hertz Pump Curves Pump Curves, Flow, and Pressure ConsiderationsCalculating Chiller Nominal Flow and Pressure to Process Electrical Schematic