Compressors Unit 23 Test Questions with All Correct Answers
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Compressors Unit 23
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Compressors Unit 23
Compressors Unit 23 Test Questions with All Correct Answers
List the main advantages that a discus compressor's valve plate design has over a conventional piston-type compressor. - Answer-has closer tolerance at dead top center, a larger bore, capacity modulation range from 10 to 100%
Briefly ...
Compressors Unit 23 Test Questions
with All Correct Answers
List the main advantages that a discus compressor's valve plate design has over a
conventional piston-type compressor. - Answer-has closer tolerance at dead top center,
a larger bore, capacity modulation range from 10 to 100%
Briefly describe how the scroll compressor compresses refrigerant gas. - Answer-by
turning one scroll against a stationary one around a common axis
List four main advantages a scroll compressor has over a conventional piston-type
compressor. - Answer-less parts, less noise, no valves, some liquid
What are the two main reasons why a compressor should have modulating capacity
control? - Answer-reduces the suction pressure and temperature variation and allows a
decrease in the compressor's cycling rate.
Briefly describe how the digital capacity control for a scroll compressor works. - Answer-
a controlled amount of refrigerant can be by-passed through a solenoid valve
List the three main advantages of having digital capacity control on a scroll compressor.
- Answer-holds precise temp, no short-cycling, amp and voltage imbalance
Explain how a compressor can be oil-free. - Answer-the oil-free centrifugal compressor
has only two moving parts; the rotor shaft and the impellers. the bearings are magnetic.
List two types of compressor failure. - Answer-mechanical, electrical, acid failure
What is the best way to check for a grounded compressor. - Answer-megger
How do you check for acid? - Answer-acid test kit
How do you clean up a compressor burn out? - Answer-FLUSH( evap condenser lines
w/RX11) CHANGE oil and filter dryer, ADD acid away, suction line filter dryer, new
refrigerant
What will a constant high superheat cause? - Answer-compressor burn out which
contaminates the other components
What do you look for after you change a compressor? - Answer-check for liquid flood
back
High superheat, high subcooling, whats the problem? - Answer-restriction
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