R-410A safety & Training Prep Exam Questions And Correct Answers.
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Course
Refrigerant 410A Certification
Institution
Refrigerant 410A Certification
Recovery cylinders used with R-410A must have a DOT rating of: - Answer either "DOT 4BA 400" or "DOT 4BW 400"
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 t...
R-410A safety & Training Prep Exam
Questions And Correct Answers.
Recovery cylinders used with R-410A must have a DOT rating of: - Answer either "DOT 4BA 400" or
"DOT 4BW 400"
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
When a blend is zeotropic, or near-azeotropic (NARM), - Answer It will have temperature glide, it can
fractionate, and leaks may cause a change in composition of the bland
R-410A is also known as - Answer Suva 410A, AZ-20, and Puron
The temperature glide for R-410A is less than _____________ degrees Fahrenheit over air conditioning
and refrigerating operating ranges. - Answer 0.3
Polyol Ester (POE) - Answer Is hygroscopic, can be irritating to the skin, and has improved heat transfer
characteristics over mineral oils
The low pressure control on R-410A system will open at: - Answer 50 pisg
Compression ratio is calculated as: - Answer Absolute discharge pressure divided by absolute suction
pressure
Both suction and discharge pressure of R-410A system are_______________ then R-22 system. - Answer
40% to 70% higher
Because of its higher vapor heat capacity, the discharge temperature of R-410A is ____________ then R-
22. - Answer lower
When a blend is zeotropic, or near-azeotropic (NARM), - Answer It should be transferred from cylinders
as a liquid to avoid fractionation
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