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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Emerson 20/20 service manual Cool Compression Control Screen
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20/20 specifications

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