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19 Cards in this Set
- Front
- Back
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The low-pressure side of the system must not be pressurized to more than 150 psig because of
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. the low-side test pressure
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True or False: The high-pressure side working pressure for most systems is 700 psig.
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False
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The ________ is both the greatest asset and the greatest liability of an electronic leak detector.
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Sensitivity
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Why should oxygen or compressed air never be used to pressurize a system?
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Oxy and oil will become unstable and may explode under pressure
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List some of the foreign matter that may enter a refrigeration system.
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Moisture, dirt, oil, nitrogen
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or False: A vacuum pump can remove any type of foreign matter that enters a refrigeration system.
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False
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Air in a refrigeration system causes which of the following problems?
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Acid buildup
Moisture Copper plating |
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The only two products that should be circulating in a refrigeration system are
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Refrigerant and Oil
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For a technician to remove moisture from a refrigeration system using a vacuum pump, it must be in a ______ state.
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Vapor
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Are the best vacuum pumps one stage or two stage?
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Two Stage
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Name the two types of vacuum procedures used by technicians.
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Deep Vacuum and triple evacuations
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What can be done to get water out from under the oil level in a compressor?
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Heat the compressor
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When evacuating a refrigeration system that has solenoid valves, what special procedure must be followed?
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The valves should be either opened manually or electrically
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Name two common vacuum gages.
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. Mercury manomemeter and micron gage
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how many microns are in 1 mm Hg.
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1000
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What gas is commonly used to sweep a refrigeration system to push out any air in the system?
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Nitrogen
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What is the advantage of using large gage lines for evacuation?
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It speeds the process
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At _____ in. Hg, water boils at 60°F.
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.522
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When a vacuum is pulled on the water in question 18, the water vapor created for each pound of water
removed is ____ cubic feet. |
1206
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