Sterling GP Series specifications Operation, Panel Buttons, Indicator Lights, and Switches

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Chapter 4: Operation

4-1 Panel Buttons, Indicator Lights, and Switches

Microprocessor Controller

The standard chillers use a microprocessor-based PID controller. The Carel PCO controller along with the Carel PGD1 Interface is a modular, self-contained unit that can slide from its mounting housing. It is factory set and adjusted; no field adjustment to the internal controls is necessary. The standard operation range is 20ºF to 80ºF (-7ºC to 27ºC).

Figure 3 - Controller Display

Button	Button Description		Detailed description
	Menu Button		Used to access the menus structure of the PGD interface
			Used to access the menus structure of the PGD interface

	On/Off Button		Used to turn the entire chiller On or Off. The button is backlit and will
			turn amber when the chiller is On.

	Back Button		Used to back up from a menu and return to the main status screen


	Up Arrow Button		Used to increment a data field or scroll up within a menu structure.


	Enter Button		Used to accept a data field value or to select a menu item.
			Used to accept a data field value or to select a menu item.

	Down Arrow Button		Used to decrement a data field or scroll down within a menu structure.

GP Series Portable Chillers

Chapter 4: Operation

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Contents GP Series Portable Chillers Shipping Information Table of Contents Maintenance 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 ConsiderationsWater-Cooled Chiller Condensers Condenser ConsiderationsAir-Cooled Chiller Condensers Water Pumps Three-Phase CompressorsChecking Motor Direction Condenser FanWater Reservoir Part Number DescriptionEthylene 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 CommunicationsGP 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 DepartmentSpecifications Air-Cooled Portable ChillersPAC-40 Water-Cooled Portable Chillers PWC-20PWC-50 Pump Curves, Flow, and Pressure Considerations Hertz Pump CurvesCalculating Chiller Nominal Flow and Pressure to Process Electrical Schematic