HVAC Refrigerant Recovery and Handling 2

Question 1

What is the maximum allowable leak rate for refrigerant systems with a charge over 50 lbs in comfort cooling applications under EPA Section 608?

Accepted Answer

15% per year

Answer

EPA Section 608 sets the leak rate trigger at 15% of the total charge per year for comfort cooling equipment with charges over 50 lbs.

Question 2

Which refrigerant blend requires special 'push-pull' recovery techniques due to its zeotropic behavior causing fractionation?

Accepted Answer

R-404A

Answer

R-404A is a zeotropic blend whose components can separate (fractionate) during recovery, making push-pull or liquid-phase recovery preferable.

Question 3

A technician recovers refrigerant into a cylinder that already contains a different refrigerant. What must happen to this cylinder?

Accepted Answer

It must be labeled as mixed/contaminated and sent to a refrigerant reclaimer

Answer

Mixing refrigerants creates a contaminated blend that cannot be reused and must be sent to a certified reclaimer for proper disposal.

Question 4

What does a 'two-stage' recovery machine do differently than a single-stage unit?

Accepted Answer

It recovers vapor first then switches to liquid recovery automatically

Answer

A two-stage recovery machine first removes vapor refrigerant, then automatically switches to remove liquid refrigerant for more complete recovery.

Question 5

Under EPA Section 608, technicians working on small appliances (systems with 5 lbs or less of refrigerant) must recover what percentage of refrigerant when using a non-self-contained recovery device?

Accepted Answer

90%

Answer

When using a non-self-contained recovery device on small appliances, technicians must recover 90% of the refrigerant.

HVAC - Heating, Ventilation, and Air Conditioning Practice Test

HVAC - Heating, Ventilation, and Air Conditioning Practice Test

HVAC Refrigerant Recovery and Handling 2