Checking Motor Direction, Water Pumps | Sterling GP Series instruction

3-8 Checking Motor Direction

All of our portable chillers have their motor rotations properly phased at the factory. If compressors, pumps, or fans are running in reverse rotation, disconnect and lock out the power source and reverse any two power leads into the chiller disconnect switch.

Caution! Do not switch leads at the motors, motor starters, or contactors.

Three-Phase Compressors

Scroll compressors are directionally-dependent and compress in one rotational direction. Reversing rotation direction results in an elevated sound level and a substantially-reduced current draw.

Water Pumps

Correct pump rotation is indicated by a positive pressure of 20 to 40 psi on the pump pressure gauge. Pump rotation should be clockwise when viewed from the motor end. For chillers with optional pumps, check the appropriate pump curve in the Appendix.

Caution! Do not run pump dry. Doing so will result in seal damage.

Condenser Fan

Air should be drawn through the condenser and discharged vertically from the chiller.

GP Series Portable Chillers

Chapter 3: Installation

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Sterling GP Series specifications Checking Motor Direction, Three-Phase Compressors, Water Pumps, Condenser Fan

Contents

GP Series Portable Chillers Shipping Information Table of Contents Maintenance How to Use This Manual SafetySafety Symbols Used in this Manual Responsibility Functional Description Models Covered in This ManualGeneral Description Chilled Water Circuit Mechanical Features Standard FeaturesElectrical Features Safety Devices and Interlocks Refrigeration FeaturesController Features Other Features Optional Features Flow SwitchHigh Pressure Cutout Remote Start/Stop Interlock Mounting Features Optional Pump Amperages Voltage Construction Full Load Amps Uncrating InstallationElectrical Connections Process Water Connections Bypass Valve ConsiderationsGalvanic Corrosion Considerations Water Treatment Considerations Water-Cooled Chiller Condensers Condenser ConsiderationsAir-Cooled Chiller Condensers Three-Phase Compressors Checking Motor DirectionWater Pumps Condenser Fan Water Reservoir Part Number Description Ethylene Glycol and Propylene Glycol Curves 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 Access Levels Page Controller Setpoints Menu Screen Alarms Optional Communications GP Series Portable Chillers Operation Maintenance Filter CleaningLubrication Maintaining the Condenser Maintaining the Evaporator Preventative Maintenance ServiceEvaporator Process Piping Y-Strainer Troubleshooting GP Series Portable Chillers Troubleshooting GP Series Portable Chillers Troubleshooting Warranty Returns AppendixReturned Material Policy Credit Returns Service Department Technical AssistanceParts Department Sales Department Specifications Air-Cooled Portable Chillers PAC-40 Water-Cooled Portable Chillers PWC-20 PWC-50 Pump Curves, Flow, and Pressure Considerations Hertz Pump Curves Calculating Chiller Nominal Flow and Pressure to Process Electrical Schematic