If the compressor oil on a hermetic compressor is acidic, the next step is to change the:
A) System filter driers once. B) System filter driers repeatedly.
C) Compressor oil repeatedly. D) Compressor oil once.
Q. 2Most hydronic heating systems are
A) Open systems in cooling and closed systems in heating
B) Closed piping systems
C) Closed systems in cooling and open in heating
D) Open piping systems
Q. 3When cleaning up after a compressor burnout, immediately after you recover the refrigerant, you should:
A) Charge the system. B) Flush the system.
C) Evacuate the system. D) Install filter driers.
Q. 4A system that is undercharged will operate with:
A) A low subcooling and a high superheat. B) A low subcooling and a low superheat.
C) A high subcooling and a high superheat. D) A high subcooling and a low superheat.
Q. 5A problem that can look like refrigerant overcharge if a service technician is only looking at system pressures is:
A) Low evaporator airflow. B) High evaporator airflow.
C) Low condenser airflow. D) An overfeeding refrigerant metering device.
Q. 6Just before charging the system with clean refrigerant, you should:
A) Recover the refrigerant. B) Install filter driers.
C) Evacuate the system. D) Flush the system.
Q. 7Suction line filters are generally designed:
A) To stay in the system permanently once installed.
B) To be removed after the system is clean.
C) To be interchangeable with liquid line driers.
D) For biflow capability in heat pumps.
Q. 8When is the best time to inform a customer regarding the cost of an expensive part the must be changed?
A) Over the phone after the call is completed B) Before actually changing the part
C) At the completion of the service call D) In the mail when the bill is sent
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