EPA 608 Prep: Type II

Which of the following always falls under the EPA definition for "major maintenance, service, or repair?"

• Replacing an oil filter

• Replacing an expansion valve

• Replacing a compressor

• Replacing an accumulator

Answer explanation

Review page 26 in your EPA 608 Manual.

Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following?

• water

• oil

• refrigerant

• non-condensables

Answer explanation

Refer to page 21 in your EPA 608 Manual.

After system servicing and recharging, why is refrigerant vapor reintroduced to the chiller before refrigerant liquid?

• Vapor charging increases pressure slowly, preventing failure of the rupture disk.

• Vapor charging is faster than liquid charging.

• Liquid charging is more difficult to control than vapor charging.

• Liquid charged into a deep vacuum will evaporate and may lower the temperature freezing water in the heat exchanger tube bundle.

Answer explanation

Review page 26 of the EPA 608 Manual.

In the event of a large release of CFC, HCFC, or HFC refrigerant in a contained area, which of the following is true?

• Safety goggles and lined butyl gloves are sufficient.

• Self-contained breathing apparatus (SCBA) or leaving the area is required.

• Respiratory protection is not required.

• Dust masks are sufficient.

Answer explanation

Refer to page 13 in the EPA 608 Manual.

A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. Unless granted additional time, how many days to you have to repair the leak and conduct the initial leak verification test?

• 1 day

• 10 days

• 30 days

• 45 days

Answer explanation

Refer to page 19 in the EPA 608 Manual.

What are refrigeration and air-conditioning compressor heaters used for?

• To reduce the amount of refrigerant in the oil.

• To prevent refrigerant vaporization.

• To reduce the amount of entrained water in the receiver.

• To prevent acid pitting.

Answer explanation

Refer to page 23 in the EPA 608 Manual.

What is a characteristic of a refrigerant oil that is hygroscopic?

• It is a good lubricant.

• It is crude oil and unrefrined.

• It readily absorbs moisture.

• It can be left open to ambient air.

Answer explanation

Review page 8 of the EPA 608 Manual.

An appliance normally containing more than 50 pounds of R-22 refrigerant was found to have a 35% annual leak rate. After the repair, how many successful verification tests are required?

• One. Performed before the appliance is recharged.

• Two. The first performed before the appliance is recharged, and the second performed after the appliance returns to normal operating conditions.

• One. Performed once the appliance returns to normal operating conditions.

• Three. The first performed after the appliance returns to normal operating conditions, and the third performed three months later.

Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums?

• It runs faster than other equipment with oil-less compressors.

• The motor relies on the flow of refrigerant through the compressor for cooling.

• It has a higher compression ratio limit than other equipment.

• The oils used in hermetic compressors are a lower viscosity than the oils used in other equipment.

Answer explanation

Refer to page 22 of the EPA Section 608 Manual.

Recovered refrigerant may contain which of the following impurities?

• Ammonia, carbon dioxide, and methyl chloride

• Sodiom chloride, potassium nitrate, and silicone oil

• Sulphur dioxide and methane

• Acids, moisture, and oil

Answer explanation

Refer to page 21 in the EPA Section 608 Preparatory Manual.