EPA Practice Test (608 Core) 3

Question 1

What is the primary environmental consequence of refrigerant CFCs and HCFCs reaching the stratosphere?

Accepted Answer

They catalytically destroy ozone molecules, thinning the protective ozone layer

Answer

CFCs and HCFCs release chlorine atoms when exposed to UV radiation in the stratosphere. Each chlorine atom catalytically destroys thousands of ozone molecules (O3 → O2 + O) through a chain reaction. Thinning of the ozone layer allows more UV-B radiation to reach Earth's surface, increasing skin cancer rates, cataracts, and damage to ecosystems and marine phytoplankton.

Question 2

How does a refrigerant's "vapor pressure" affect the type of recovery equipment needed?

Accepted Answer

High vapor pressure (high-pressure) refrigerants require compressor-based recovery; very low-pressure refrigerants may use heat and temperature differential methods

Answer

Refrigerant vapor pressure at operating temperatures determines the recovery approach. High-pressure refrigerants (R-22, R-410A) have significant vapor pressure at room temperature, requiring compressor-based recovery machines to capture them efficiently. Low-pressure refrigerants (R-11, R-123) have very low vapor pressures and can sometimes be recovered using heat applied to the evaporator to drive refrigerant toward the recovery cylinder. Equipment selection must match refrigerant characteristics.

Question 3

Why is it important to never mix different refrigerants in the same recovery cylinder?

Accepted Answer

Mixed refrigerants create a non-reclaimable contaminated blend that must be destroyed

Answer

When different refrigerants are mixed in a recovery cylinder, the result is a contaminated blend that cannot be separated by standard recycling methods. The only option is to send the contaminated cylinder to a reclaimer who must destroy it, as the mixed refrigerant cannot be restored to a usable pure or certified blend. This wastes refrigerant and incurs disposal costs. Always use separate, clearly labeled cylinders for each refrigerant type.

Question 4

A manifold gauge set's high-side (red) hose is connected to which service port on a refrigeration system?

Accepted Answer

The discharge service valve or liquid line on the high-pressure side

Answer

On a standard manifold gauge set, the red (high-side) hose connects to the high-pressure side of the system — typically the discharge service valve on the compressor outlet or the liquid line service valve. The blue (low-side) hose connects to the suction (low-pressure) side. The yellow center hose connects to recovery cylinders, vacuum pumps, or refrigerant supply cylinders. Connecting incorrectly could send high-pressure refrigerant where it should not go.

Question 5

When must an appliance owner notify the EPA of a leak in a system with over 50 lbs of refrigerant?

Accepted Answer

Within 30 days if the leak has not been repaired after exceeding threshold for more than 30 days

Answer

Under EPA Section 608 regulations, appliance owners whose systems exceed the applicable leak rate threshold must repair the leak within 30 days. If the leak cannot be repaired within 30 days and the owner cannot prepare a retrofit/retirement plan, they must notify the EPA within the same 30-day window. For industrial process refrigeration, a one-time 120-day extension may be sought under specific conditions.

EPA 608 609 Practice Test

EPA 608 609 Practice Test

EPA Practice Test (608 Core) 3