Refrigerant 410A Certification Prep Exam Questions And Already Passed Answers.
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Course
HVAC CONTRACTOR
Institution
HVAC CONTRACTOR
-Suva 410a
-AZ-20
-Puron - Answer R-410a is also known as?
0.3 - Answer The temperature glide for R-410a is less than _____ degrees Fahrenheit over air conditioning and refrigeration operating ranges.
-Can be irritating to the skin
-Is hydroscopic
-Has improved heat transfer charact...
0.3 - Answer The temperature glide for R-410a is less than _____ degrees Fahrenheit over air
conditioning and refrigeration operating ranges.
-Can be irritating to the skin
-Is hydroscopic
-Has improved heat transfer characteristics over mineral oils - Answer Polyol Ester (POE):
50 psig - Answer The low pressure control on R-410a systems will open at:
Absolute discharge pressure divided by absolute suction pressure - Answer Compression ratio is
calculated as:
40% to 70% higher - Answer Both suction and discharge pressure of R-410a systems are _____ than R-
22 systems.
Lower - Answer Because of its higher vapor capacity, the discharge temperature of R-410a is _____
than R-22.
610 psig plus or minus 10psig - Answer R-410a systems use a high pressure switch that will open at
approximately:
, lose or gain - Answer Subcooled liquid in the receiver may _____ subcooling, depending on
surrounding conditions.
800 psig - Answer When installing a liquid line filter drier on a R-410a system, be certain that it has a
pressure rating of at least:
Smaller than that of a R-22 Metering device - Answer The flow area of a R-410a metering device is:
It may separate (fractionate) into its component refrigerants - Answer Which of the following
statements is true of R-407c
will not fractionate - Answer A true azeotropic blend:
-Leaks may cause a change in composition of the blend
-It will have temperature glide
-It can fractionate - Answer When a blend is zeotropic, or near-azeotropic (NARM)
It should be transferred from cylinders as a liquid to avoid fractionation - Answer When a blend is
zeotropic, or near azeotropic (NARM)
Cause the components to leak at uneven rates due to varying vapor pressures - Answer Near-
azeotropic blend fractionation may;
None of the above - Answer Blends that have fractionated, depending on the constituent make-up,
may become;
Should be charged in the liquid phase - Answer To avoid fractionation, blended refrigerants:
Be sure it is throttled into the low side to avoid compressor damage - Answer When charging an
operating R-410a system with liquid refrigerant,
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