EPA 608 Type I Practice Test 3 — Questions and Answers
Question 1: What is the correct procedure for recovering refrigerant from a small appliance (Type I) using the system-dependent method?
- Run the compressor until suction pressure drops to the required vacuum, then close the service valve (Correct answer)
- Puncture the refrigerant line and capture escaping gas in a bag
- Open the system access valve and allow refrigerant to naturally equalize into the recovery cylinder
- Remove the compressor and drain refrigerant by gravity
Correct answer: Run the compressor until suction pressure drops to the required vacuum, then close the service valve
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?
- The access valve should remain open to allow pressure monitoring
- The access valve must be sealed with a locking cap to prevent future refrigerant loss (Correct answer)
- The access valve should be removed to restore the system to factory condition
- No action is required; access valves automatically seal when disconnected
Correct answer: The access valve must be sealed with a locking cap to prevent future refrigerant loss
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?
- R-22
- R-11
- R-12 (Correct answer)
- R-502
Correct answer: R-12
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?
- No certification is required for systems under 5 lbs
- Type I certification (Correct answer)
- Type II certification
- Either Type I or Type II certification
Correct answer: Type I certification
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?
- Nitrogen will damage the copper tubing in small appliances
- Mixing refrigerant vapor with air or nitrogen creates a potentially explosive mixture (Correct answer)
- Nitrogen cannot be used in systems with mineral oil
- Compressed air will freeze moisture in the system before testing
Correct answer: Mixing refrigerant vapor with air or nitrogen creates a potentially explosive mixture
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.
Question 6: For which scenario does EPA Section 608 NOT require refrigerant recovery before opening a system?
- Replacing a leaking evaporator coil on a window air conditioner
- Cleaning coil fins without opening the refrigerant circuit (Correct answer)
- Adding refrigerant to an undercharged room air conditioner
- Replacing a failed compressor on a household refrigerator
Correct answer: Cleaning coil fins without opening the refrigerant circuit
Recovery is not required when the work being performed does not involve opening the refrigerant circuit. Cleaning coil fins is an external service task that does not expose refrigerant. However, any work that requires opening the refrigerant circuit — such as component replacement, brazing, or charging — requires refrigerant recovery before proceeding, regardless of the charge size.
EPA 608 Type I Practice Test 3
What is the correct procedure for recovering refrigerant from a small appliance (Type I) using the system-dependent method?