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

Type II certification under EPA Section 608 covers high-pressure systems other than small appliances. This includes most commercial and industrial refrigeration equipment, large split systems, rooftop units, and other high-pressure systems that contain refrigerants such as R-22, R-410A, R-404A, and similar refrigerants that operate above atmospheric pressure.

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-404A is a high-pressure HFC refrigerant blend commonly used in commercial refrigeration, supermarket display cases, and transport refrigeration (Type II systems). R-11, R-113, and R-123 are low-pressure refrigerants that operate below atmospheric pressure at room temperature, requiring Type III certification to service.

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

R-410A has significantly higher operating pressures than older refrigerants. At a 45°F saturated suction temperature (typical for comfort cooling), R-410A has a saturation pressure of approximately 102 psig. This is roughly twice the pressure of R-22 at the same temperature, which is why R-410A systems require higher-rated components and service equipment.

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

Before opening any refrigerant system for service (such as replacing components), the technician must first recover the refrigerant charge using EPA-certified recovery equipment. Venting refrigerant to the atmosphere is prohibited. Only after recovering the refrigerant to the required level may the system be opened safely.

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

R-410A is technically near-azeotropic, but as a blended refrigerant it should be charged as a liquid (from the liquid valve on the cylinder) to maintain proper blend composition. If charged as vapor, the two components (R-32 and R-125) may fractionate — meaning lighter components escape first — altering the blend ratio and reducing system performance. Always charge blended refrigerants as liquid.

EPA 608 609 Practice Test

EPA 608 609 Practice Test

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