Air Conditioning Repair Refrigerant Handling and Recovery Questions and Answers — Questions and Answers
Question 1: Which of the following actions is a direct violation of the EPA's Section 608 "prohibition on venting"?
- Releasing nitrogen used for a pressure test.
- Failing to keep service records for an appliance containing 15 pounds of R-410A.
- Knowingly releasing R-22 from a hose when disconnecting from a residential system. (Correct answer)
- Topping off a system with a non-exempt refrigerant without first repairing a known leak.
Correct answer: Knowingly releasing R-22 from a hose when disconnecting from a residential system.
Section 608 of the Clean Air Act prohibits the knowing release of ozone-depleting and substitute refrigerants (like R-22 and R-410A) into the atmosphere during service or disposal of equipment. Releasing the small amount of refrigerant trapped in a hose is considered a violation. Nitrogen is an inert gas and not subject to this prohibition.
Question 2: A technician is recovering refrigerant from a system with a confirmed compressor burnout. Which of the following actions is MOST critical to protect the recovery equipment?
- Chilling the recovery cylinder in an ice bath.
- Using an in-line filter-drier on the recovery hose. (Correct answer)
- Recovering only in the vapor phase to avoid liquid slugging.
- Operating the recovery machine in a well-ventilated area.
Correct answer: Using an in-line filter-drier on the recovery hose.
A compressor burnout creates acids and sludge in the refrigerant and oil. Using an in-line filter-drier during recovery is essential to capture these contaminants, protecting the recovery machine's compressor, seals, and sensors from damage.
Question 3: To prevent a recovery cylinder from dangerously over-pressurizing, a technician must ensure it is not filled with liquid refrigerant beyond what percentage of its water capacity by weight?
- 95%
- 50%
- 65%
- 80% (Correct answer)
Correct answer: 80%
Recovery cylinders must not be filled with liquid refrigerant beyond 80% of their capacity. This leaves a 20% vapor space to allow the liquid to expand with temperature changes, preventing a massive increase in hydrostatic pressure that could rupture the tank.
Question 4: According to standard safety practices, what is the MINIMUM personal protective equipment (PPE) a technician should wear when connecting and disconnecting refrigerant hoses?
- Safety glasses with side shields and gloves. (Correct answer)
- A full-face respirator and steel-toed boots.
- Hearing protection and a hard hat.
- An apron and a reflective vest.
Correct answer: Safety glasses with side shields and gloves.
Liquid refrigerant can cause severe frostbite on contact with skin and permanent eye damage from splashes. Therefore, safety glasses with side shields and refrigerant-resistant gloves are considered the minimum required PPE for refrigerant handling.
Question 5: A technician is trying to locate a very slow, intermittent refrigerant leak in a residential split system. A visual inspection reveals no oil traces. Which of the following is the MOST effective method for precisely locating this type of leak?
- Pressurizing the system with nitrogen and listening for a hissing sound.
- Using a high-sensitivity electronic leak detector. (Correct answer)
- Applying soap bubbles to all accessible joints and fittings.
- Adding fluorescent dye and returning the next day with a UV light.
Correct answer: Using a high-sensitivity electronic leak detector.
For very slow or intermittent leaks, a high-sensitivity electronic leak detector is the most effective tool. It can detect refrigerant concentrations in parts per million, allowing it to pinpoint leaks that are too small to produce audible hissing or visible bubbles with a soap solution.
Question 6: To minimize the release of refrigerant when connecting and disconnecting gauges, EPA regulations require service hoses to be equipped with which of the following?
- Color-coded grips for easy identification.
- A minimum length of six feet for safety.
- Brass fittings to prevent corrosion.
- Low-loss fittings or shut-off valves. (Correct answer)
Correct answer: Low-loss fittings or shut-off valves.
EPA regulations under Section 608 mandate that hoses used for servicing, recovering, and charging must be equipped with low-loss fittings or valves that close automatically when the hose is disconnected. This is to trap the refrigerant within the hose and prevent it from being released into the atmosphere.
Air Conditioning Repair Refrigerant Handling and Recovery Questions and Answers
Which of the following actions is a direct violation of the EPA's Section 608 "prohibition on venting"?