R 410A EXAM SCRIPT UPDATED
COMPLETE QUESTIONS AND ANSWERS
EXPERT REVIEWED
●● A system using R-410A refrigerant has bubbles in the sight glass.
Technician A says that the system must be low on refrigerant. Technician
B says that the bubbles could be caused by the blended refrigerant
flashing in the increased volume of the sight glass. Who is correct?
Answer: Technician B only
●● When charging a R-410A system that uses a thermostatic expansion
valve, proper charge can be determined by measuring
Answer: Subcooling
●● When charging a R-410A system that uses a capillary tube or fix
metering device, proper charge can be determined by measuring
Answer: Superheat
●● Compressor internal pressure relief (IPR) settings for R-410A
systems are:
Answer: 550 psig to 625 psig
●● When handling refrigerants, technicians should:
, Answer: Where approved eye protection and gloves
●● R-410A systems use a high pressure switch that will open at
approximately:
Answer: 610 psig plus or minus 10 psig
●● Subcooled liquid in the receiver may ______________ subcooling,
depending on surrounding conditions.
Answer: either "lose" or "gain"
●● When installing a liquid line filter dryer on a R-410A system, be
certain that it has a pressure rating of at least:
Answer: 600 pisg
●● The flow area of a R-410A metering device is:
Answer: Smaller than that of a R-22 metering device
●● Which of the following statements is true of R-407C
Answer: It may separate (fractionate) into its component refrigerants
●● A true Azeotropic blend
Answer: Has no temperature glide, will not fractionate, and behaves as a
single component refrigerant
COMPLETE QUESTIONS AND ANSWERS
EXPERT REVIEWED
●● A system using R-410A refrigerant has bubbles in the sight glass.
Technician A says that the system must be low on refrigerant. Technician
B says that the bubbles could be caused by the blended refrigerant
flashing in the increased volume of the sight glass. Who is correct?
Answer: Technician B only
●● When charging a R-410A system that uses a thermostatic expansion
valve, proper charge can be determined by measuring
Answer: Subcooling
●● When charging a R-410A system that uses a capillary tube or fix
metering device, proper charge can be determined by measuring
Answer: Superheat
●● Compressor internal pressure relief (IPR) settings for R-410A
systems are:
Answer: 550 psig to 625 psig
●● When handling refrigerants, technicians should:
, Answer: Where approved eye protection and gloves
●● R-410A systems use a high pressure switch that will open at
approximately:
Answer: 610 psig plus or minus 10 psig
●● Subcooled liquid in the receiver may ______________ subcooling,
depending on surrounding conditions.
Answer: either "lose" or "gain"
●● When installing a liquid line filter dryer on a R-410A system, be
certain that it has a pressure rating of at least:
Answer: 600 pisg
●● The flow area of a R-410A metering device is:
Answer: Smaller than that of a R-22 metering device
●● Which of the following statements is true of R-407C
Answer: It may separate (fractionate) into its component refrigerants
●● A true Azeotropic blend
Answer: Has no temperature glide, will not fractionate, and behaves as a
single component refrigerant
