Chapter 26

Question 1

Why must you avoid running a refrigeration system below 14 kPa when pumping down?
A. A slightly positive system pressure is required to prevent air infiltration.
B. Too much refrigerant will be required for a recharge.
C. The compressor will need to be stopped to prevent it running dry.
D. The system’s heat exchangers will ice up.

Answer 1

A

Question 2

What is the purpose of the chilled water flow switch?
A. Starts the compressor on a low refrigerant flow condition.
B. Opens the vane so that the compressor can be restarted under load.
C. Protects the chiller from freezing due to lack of water flow.
D. Starts the chilled water booster pump.

Answer 2

C

Question 3

Where can refrigeration system log sheets be obtained from?
a. Refrigeration system manufacturers
b. Inspection and insurance companies
c. Developed by the refrigeration system operator
d. All of the above

Answer 3

D

Question 4

Which of the following is not a benefit of a preventative maintenance program?
a. Control of labor and material costs
b. Allows for the accumulation of all spare parts for each piece of equipment in case of a major breakdown
c. Accumulation of history records for each piece of equipment
d. Better means of identifying causes of breakdowns

Answer 4

B

Question 5

What is the symptom of a refrigeration system that has high suction pressure due to an oversized expansion valve?
A. An abnormally cold suction line.
B. Undersized compressor.
C. Fouled condenser.
D. Contaminants in the refrigerant.

Answer 5

A