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Official online tests are graded instantly and cards are mailed within a few weeks. This is because liquid charged into a deep vacuum will cause the refrigerant to boil and may lower temperatures enough to freeze the water in the tubes.According to the EPA there is approximately 100 lbs of refrigerant vapor left in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid has been removed.Both CFC-11 and HCFC-123 chillers require purge units because the system operates below atmospheric pressure.On a low pressure chiller with an open-type compressor, the shaft seal is very susceptible to leaks. This is the first in a series of free practice tests on handling refrigerants in low-pressure appliances and servicing low-pressure equipment. Remember that you must also pass the Core section of the EPA test in order to be certified as a Type III technician.
Here are some practice questions for passing the EPA 608 exam including the Core, Type 1, Type 2, and Type 3 test.
Hence you can not start it again.All recovery cylinders must be DOT approved and have a current hydrostatic test date stamped on them if they contain a refrigerant with a pressure above _____ at room temperature If system pressure does not rise, remove the compressor.The proper charging method for blended (non-azeotropic) refrigerants (400 series) is to remove the charge from the cylinder as a liquid.Heat pumps that have been retrofitted from R-22 to R-407C should be leak checked with pressurized nitrogen.Manifold gauge set hoses should have self-sealing connectors or hand valves to minimize the release of refrigerant when the hoses are connected and disconnected.Your recovery/recycling machine has R-22 refrigerant in it. You have already completed the quiz before.
If you want to truly take your studying to the next level then I would suggest checking out our premium EPA 608 practice test solution.This is the ultimate test prep as you get access to hundreds of test questions that are not available anywhere else. However, it can be dangerous if not used with a pressure regulator.Never use oxygen or compressed air to leak check equipment because R-410A can explode when mixed with air or oxygen.To change the compressor on a system containing 40 pounds of R-500 using a recycling machine that was manufactured AFTER November 15 1993, you must isolate the compressor then evacuate the isolated section of the system to 10 inches of vacuum and hold. Want More Practice? If the system pressure does not rise, remove the compressor.Pressure relief valves must not be installed in series.R-410A requires a high-pressure manifold gauge and hose set. Quiz is loading... You must sign in … In low pressure chiller refrigeration system.What should be done after recovering liquid refrigerant from refrigeration system?If the liquid charging into the refrigeration system is under 29 Hg vacuum then ………………….Which of the following is the lowest access point on the low pressure centrifugal air-conditioning unit?The purpose of circulating water during the evacuation chiller refrigeration system is to …………..You have already completed the quiz before.