UNIT 49 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
49-1) How is the temperature drop through a DX coil on a split AC system
determined?
49-2) What is the most common problem of air failure on a split AC system?
49-3) If a split AC system does not operate at all the problem is most likely what?
49-4) If the electrical load of a split AC system is not working, what must the
technician try to determine?
49-5) What does an electrical connection diagram show?
49-6) List the measurements that need to be taken to determine the extent of a
mechanical problem in a split AC system.
49-7) How are normal coil operating temperatures for a split AC system determined?
49-8) How does condenser size affect the EER?
49-9) What has the predominant effect on the amount of subcooling produced in the
condenser of a split AC system?
49-10) What should be done if you suspect problems due to mismatched equipment
sizes on a split AC system?
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mismatched in size and make recommendations to resolve the problems if a
mismatched system exists.
49-11) What type of temperature drop would you expect across the DX coil on a split
AC system due to insufficient air flow?
49-12) What will happen to the suction pressure on a split AC system that is running
with an excessive load?
49-13) Why do split AC systems often fail during the night?
49-14) A split AC system that uses a fixed metering device should not be charged if
the ambient temperature falls below what level?
49-15) Capillary tube systems must be charged to within what tolerance?
49-16) What happens to the refrigerant superheat if a split AC system using a capillary
tube is overcharged?
49-17) What happens to the amperage draw of a condensing unit on a split AC system
if the liquid line is restricted?
49-18) How can one determine between a refrigerant shortage as compared to a
suction line restriction on a split AC system?
49-19) How can you determine between an inefficient compressor as compared to a
hot gas line restriction on a split AC system?
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toward a restriction between the outlet of the compressor and the pressure
measuring point.
49-20) Is it acceptable to add a little extra refrigerant to a system just in case it may
have a leak?