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The compressor type purge unit operates independently by means of a small reciprocating compressor to remove the air, moisture and a small quantity of refrigerant from the condenser. The thermal type purge unit operates on a pressure differential principle, and a reciprocating compressor is not required. Part 7. Refrigeration Equipment | Chapter 2. Centrifugal Refrigeration Machine Although the purge unit performs a highly efficient job of removing refrigerant from the air being purged, it is physically impossible to recover all the entrained refrigerant; some is always lost.

1. It should be located so that the installation costs of the piping between the unit and the equipment it supplies and the wiring and piping of the services to the unit are at a minimum. 2. There should be sufficient space near the machine for auxiliary equipment such as chilled water and condenser water pumps and piping. 3. There should be adequate clearances around the machine for access, servicing, and tube pulling or cleaning. Many absorption machines along with their boilers and auxiliaries are installed on upper floors or roofs of buildings because the location has many advantages.

INSULATION The cooler, suction piping and other cold surfaces should be insulated to prevent sweating. Float valve chambers, water boxes and other parts of the machine which may require servicing should be provided with a removable type of insulation, such as sheet metal covers filled with granulated cork. Various types of insulation can be used, such as vegetable cork, closed cell foamed plastic and expanded polystyrenes. LOCATION Machine location and layout should be carefully studied when applying a centrifugal machine.

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