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UNIT 18 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
18-1) What is an evaporator pressure regulator?
18-2) What systems use crankcase pressure regulators?
18-3) How does a CPR work?
18-4) What is the purpose of a solenoid valve?
18-5) How can a technician tell which direction a solenoid valve should be
installed?
18-6) Explain the different methods used to maintain a minimum high-side
pressure on outdoor air-cooled condensers.
18-7) What are the two basic types of relief valves used on refrigeration systems?
18-8) What is the function of a suction line accumulator in a refrigeration system?
18-9) What is the function of an oil separator in a refrigeration system?
18-10) What is the function of a receiver in a refrigeration system?
18-11) Why are suction-to-liquid line heat exchangers used on refrigeration systems?
18-12) What device can be installed on a system to indicate the moisture content of
the refrigerant?
18-13) Where are vibration eliminators installed in a system?
18-14) What is the purpose of a hot gas muffler?
18-15) Why do some systems have discharge check valves?
18-16) What is the purpose of the three-way valve in a system with a heat reclaim
coil?
18-17) How can a system with a heat reclaim coil improve a building’s overall
efficiency?
18-18) What is the difference between a liquid receiver and a suction line
accumulator?
18-19) Explain the operation of a solenoid valve.
A solenoid valve is a flow control device that stops or allows the flow of a
18-20) List the types of contaminants that filter driers must remove.
18-21) Why are filter driers required when installing a new system that uses POE
lubricant?
18-22) What is a desiccant?
18-23) What two ways are desiccants held inside a filter drier?
18-24) How does a sight glass moisture indicator indicate the presence of moisture
in the system?
18-25) What is the difference between a strainer and a filter-drier?
18-26) Why do some manufacturers require that suction line filters be removed from
a system after the system has been cleaned?
18-27) What types of systems normally use crankcase pressure regulators?
18-28) How does a suction to liquid heat exchanger improve system efficiency?
18-30) Why should only refrigeration rated isolation valves be used on a
refrigeration system?
18-31) Why is it important to insure that any refrigeration component used on an
HFC 410A system be rated for HFC 410A use?
