EPA 608 609 - EPA Refrigerant Handling Type II High-Pressure Systems Questions and Answers 2

Question 1

EPA Section 608 Type II certification covers which category of refrigeration and air conditioning equipment?

Accepted Answer

High-pressure systems other than small appliances

Answer

Small appliances with hermetically sealed compressors and less than 5 lbs of refrigerant

Answer

Low-pressure systems using refrigerants below atmospheric pressure

Answer

Motor vehicle air conditioning systems

Question 2

Which refrigerant is classified as a high-pressure refrigerant and commonly used in commercial refrigeration Type II systems?

Accepted Answer

R-404A (high-pressure)

Answer

R-11 (low-pressure)

Answer

R-113 (low-pressure)

Answer

R-123 (low-pressure)

Question 3

What is the normal operating suction pressure range for an R-410A air conditioning system at a 45°F evaporator saturation temperature?

Accepted Answer

Approximately 102 psig

Answer

Approximately 30 psig

Answer

Approximately 68 psig

Answer

Approximately 130 psig

Question 4

Before opening a high-pressure refrigerant system for service, what must a certified technician always do first?

Accepted Answer

Recover the refrigerant charge to meet EPA requirements

Answer

Add a dye tracer to locate any existing leaks

Answer

Increase system pressure to test for leaks before opening

Answer

Drain the oil from the compressor crankcase

Question 5

R-410A is a zeotropic blend refrigerant. What does this mean for technicians during leak and recharge situations?

Accepted Answer

It must always be charged as a liquid because its blend components can fractionate

Answer

It can be charged as either vapor or liquid without affecting its composition

Answer

It is an azeotropic blend that behaves like a single-component refrigerant

Answer

It separates into its components at temperatures above 100°F

Question 6

What is the purpose of a liquid line filter-drier in a high-pressure refrigeration system?

Accepted Answer

To remove moisture, acid, and particulates from the refrigerant

Answer

To reduce refrigerant velocity entering the expansion device

Answer

To separate oil from refrigerant on the high-pressure side

Answer

To prevent refrigerant from flowing backward through the compressor