Emerson 20/20 service manual Cool Compression Control Screen

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Section 25 • Cool Compression Control

Overview

The cool compression compressor operation is similar to the standard single screw compressor units, except there is no external oil cooler to the unit. A blanket of liquid ammonia lies on top of the oil in the oil separa- tor. The liquid ammonia level is regulated by sensing the liquid ammonia level with a level probe, and using a positioning valve to vary the amount of liquid ammo- nia being added to the separator. The cooling occurs through the entire compression and separation process. The Cool Compression compressor does not have an oil pump. When the Cool Compression compressor unit is commanded to start, the control panel first insures that the slide valves are at their minimum positions. The suc- tion oil injection solenoid (SOI) is energized – allowing a path for oil to flow into the compressor. The compressor now starts. There is an initial pressure drop in the suc- tion chamber of the compressor and a corresponding increase in pressure on the discharge of the compres- sor. This creates a pressure differential that forces the oil and liquid ammonia mixture through the suction oil

injection line into the suction chamber of the compres- sor. This oil and liquid provides lubrication and cooling until full pressure differential lubrication is attained. As the differential pressure increases, the oil and liquid am- monia is now injected into the screw during the com- pression process and the oil injection valve is allowed to close.

Setup

Configuration Screen:

•To setup the Vission 20/20 panel for Cool Compression, first ensure that an analog output card is installed in the panel, and it is selected/enabled from page 6 of the configuration screen, see Figure 25-1. Cool Compression Control Screen. Navigate to configuration page 2, and select “R717-Cool Comp” from the drop-down box that is labeled “Refrigerant”. Once selected “Cool Compression” option will ap- pear in Oil Pump and Oil Cooling sections and “Cool Compression” gets selected automatically. It will also

Figure 25-1. Cool Compression Control Screen

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153

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Contents Vission 20/20 micro-controller Page Table of Contents Digital I/O Board Layout Top Status Bar TOCCompressor Sequencing Event List Data Backup List of Tables and Figures END of TOC How to Use This Manual Compressor Amperage Load Limiting Operational Flow ChartsRequirements to Start Compressor Critical Compressor Run Logic at Compressor StartOperational Flow Charts 2 Proper Wiring Sizing Installation RecommendationsVoltage Source Grounding DC signalsMixing Voltages Correct Transformer Wiring Method Wiring MethodsBest Practices Overview Hardware ArchitectureDigital Input/Output I/O Board Description Type Digital I/O 1Refer to -2. Analog Inputs Motor Current Analog InputsAnalog Inputs 1 Digital I/O 2Digital & Analog I/O Boards Layout Analog OutputsDigital I/O Board Layout Analog Inputs 2Digital Output Board Layout Digital Output BoardsDigital Input Board Layout Digital Input BoardsDigital Input-Output Board Layout Digital In-Out BoardsAnalog Input Board Layout Analog Input BoardsAnalog Input Jumper Tables Channel SignalJP-13 JP-14 JP-15 JP-31 Analog Output Board Layout Analog Output BoardsMain Screen Main ScreenTop Status Bar Parameter Bar Unit Start Pop-Up Window Bottom Status Bar Splash Screen Navigation Buttons Menu ScreenMenu Screen Pulse Proportional Control Compressor ControlProportional Band & Setpoint Auto-CycleVFD One-Step Control Method Variable Frequency Drive VFDPumpdown Control Pulldown Control Capacity Slide Triggered Outputs Control ModeVolume Slide Position Offset Stop Load and Force UnloadOil Control Load AnticipatingLiquid Injection Compressor Control Alarms and Trips Setpoints Alarms and TripsAlarms and Trips Compressor Inhibits Safety Failure MessagesFalse Start Timer Setpoints TimersOil Separator Level #2 Safety Trip Delay Timers Blank Scheduling Setpoint Compressor SchedulingCompressor Scheduling Pressure Control Setpoints Compressor SequencingCFM Equipment List 10 4 / Blank Condenser Control Setpoint Condenser ControlStep Control Step Control Screen VFD Settings11 4 / Blank Digital Outputs Service OptionsAnalog Outputs Instruments Calibration Pressure and Temperature InputsRemote Capacity Motor CurrentAnalog Inputs 13 4 / Blank Capacity Slide Valve Potentiometer Slide CalibrationSlide Valve Operation Volume Slide Valve PotentiometerSlide Valve Actuator Calibration for Optical Style Motors Photochopper Command Shaft Rotation Required By Actuator Command Shaft RotationSlide Valve Troubleshooting Guide 1 Slide Valve Troubleshooting GuideSlide Valve Troubleshooting Guide 2 LED Blink Codes and Troubleshooting Guide 1 Slide Valve Actuator Troubleshooting Guide Blink CodePleted. The actuator will not move while this error code LED Blink Codes and Troubleshooting Guide 2Chart Operation Trend ChartTrend Data Storage Trend Setup Screen Setup15 4 / Blank Event list Columns Event List16 2 / Blank Input/Output Screen Input / Output17 2 / Blank Digital Inputs Auxiliary Input / OutputDigital Outputs Control 18 4 / Blank Units ConfigurationTime & Date Touchscreen CommunicationsAnti-Recycle Model & Refrigerant Restart On Power FailureCompressor Sequencing LanguageOptional Function Selection Compressor ControlMotor Current Device Condenser ControlOil Pump Oil CoolingDigital Inputs Analog Inputs Analog Outputs Configuration 19 10 / Blank Save / Load Data BackupData Backup Migrate Factory Reset20 4 / Blank Checklist MaintenanceLog ChartApply User AccessManage Accounts LoginScreen Security Levels Security Access Levels22 4 / Blank Help Screen Screen FeaturesVersion Pop-Up Screen Twin Screw Control Screen Twin Screw ControlOperation Cool Compression Control Screen Cool Compression ControlCool Compression Control Functions Screen Control FunctionsOperational Differences from Single Screw Auto Load TimerCool Compression Control

20/20 specifications

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