EPA 608 Type I Practice Test 3

Question 1

What is the correct procedure for recovering refrigerant from a small appliance (Type I) using the system-dependent method?

Accepted Answer

Run the compressor until suction pressure drops to the required vacuum, then close the service valve

Answer

The system-dependent recovery method uses the appliance's own compressor to draw refrigerant out of the system. The compressor runs while the refrigerant is routed to a recovery cylinder. The process continues until suction pressure drops to the required vacuum level (4 inches Hg for operable compressors on small appliances), then the service valve is closed to seal the recovered charge.

Question 2

When an access valve is installed on a Type I small appliance for servicing, what must be done after recovery is complete?

Accepted Answer

The access valve must be sealed with a locking cap to prevent future refrigerant loss

Answer

After recovery and service on a small appliance, any access valve that was installed must be fitted with a locking-type (tamper-resistant) cap to prevent refrigerant loss between service calls. These caps prevent both accidental and intentional venting of refrigerant and are required under EPA regulations to maintain the system's integrity.

Question 3

What refrigerant was the standard in household refrigerators and small appliances before the CFC phaseout?

Accepted Answer

R-12

Answer

R-12 (CFC-12, dichlorodifluoromethane) was the refrigerant of choice in household refrigerators, freezers, and small commercial refrigeration equipment for decades before the CFC phaseout. The U.S. phased out new production of R-12 by January 1, 1996, leading to the transition to R-134a and eventually R-600a in small appliances.

Question 4

A dehumidifier contains 3 lbs of R-22 and needs to have its compressor replaced. Which EPA 608 certification type authorizes the technician to perform this recovery?

Accepted Answer

Type I certification

Answer

A dehumidifier with 3 lbs of R-22 in a hermetically sealed factory-charged system qualifies as a Type I small appliance under EPA Section 608. Type I certification is the appropriate credential for this equipment. Although Type II and Universal certifications also authorize high-pressure system work, the specific small appliance category is Type I.

Question 5

Why must technicians avoid using nitrogen or compressed air to pressure-test small appliance refrigerant circuits before checking for refrigerant vapor?

Accepted Answer

Mixing refrigerant vapor with air or nitrogen creates a potentially explosive mixture

Answer

Pressurizing a refrigerant system with air or compressed air containing oxygen while refrigerant vapor is still present creates a highly flammable and potentially explosive mixture. Even non-flammable refrigerants can form dangerous mixtures with air under certain conditions. Only dry nitrogen (which contains no oxygen) should ever be used to pressure-test refrigerant systems.

EPA 608 609 Practice Test

EPA 608 609 Practice Test

EPA 608 Type I Practice Test 3