HVAC EPA 608 Refrigerant Certification 4

Question 1

What critical safety hazard is associated with refrigerant cylinders exposed to direct flame or excessive heat?

Accepted Answer

BLEVE (Boiling Liquid Expanding Vapor Explosion)

Answer

Overheated refrigerant cylinders can experience a BLEVE — a catastrophic explosion caused by rapid vaporization of liquid refrigerant exceeding cylinder pressure limits.

Question 2

What does a subcooling measurement tell a technician about a refrigeration system?

Accepted Answer

How much the liquid refrigerant temperature is below its saturation temperature at the condenser outlet

Answer

Subcooling is the number of degrees the liquid refrigerant has cooled below its saturation (condensing) temperature, ensuring solid liquid reaches the expansion device.

Question 3

Which type of metering device maintains a constant evaporator superheat regardless of load changes?

Accepted Answer

Thermostatic Expansion Valve (TXV/TEV)

Answer

The TXV (Thermostatic Expansion Valve) senses evaporator outlet temperature and adjusts refrigerant flow to maintain a constant superheat set point.

Question 4

Under EPA 608, which of the following is NOT a recognized method for verifying that a leak repair was successful?

Accepted Answer

Visually inspecting for oil staining only

Answer

Visual inspection for oil staining alone is not an accepted verification method; EPA requires leak testing with detectors, pressure testing, or operational verification.

Question 5

What is the GWP of R-410A relative to CO2?

Accepted Answer

Approximately 2,088

Answer

R-410A has a GWP of approximately 2,088, making it a significant greenhouse gas and a target for phase-down under AIM Act regulations.

HVAC Practice Test

HVAC Practice Test

HVAC EPA 608 Refrigerant Certification 4