EPA Section 608 Universal Certification ExamType I (Small Appliances)Medium
A technician is recovering refrigerant from a small appliance. If the appliance contains a non-condensable gas, such as air, what effect will this have on the recovery process and equipment?
- AIt will cause the recovery machine to operate hotter and increase discharge pressure.
- BIt will prevent the recovery machine from pulling a sufficient vacuum.
- CIt will reduce the risk of overfilling the recovery cylinder.
- DIt will improve the efficiency of the recovery machine by increasing discharge pressure.
Show answer & explanationAnswer & explanation
Correct answer: A. It will cause the recovery machine to operate hotter and increase discharge pressure.
Non-condensable gases, like air, will not condense with the refrigerant. This leads to higher-than-normal discharge pressures in the recovery machine, causing it to work harder, run hotter, and potentially damage components.
Why the other options are wrong
- B. While non-condensables make achieving a deep vacuum difficult, the most immediate and direct impact on the recovery machine itself is increased pressure and heat.
- C. Non-condensables do not affect the weight-based overfilling protection.
- D. Increased discharge pressure is detrimental, not an improvement.
Non-Condensables in Recovery
The presence of non-condensable gases (e.g., air) in a system during refrigerant recovery leads to increased discharge pressure, higher operating temperatures, and reduced efficiency of the recovery equipment.
- Air does not condense at typical refrigerant temperatures.
- Increases head pressure in the recovery system.
- Causes recovery machine to run hotter.
- Reduces recovery efficiency and can damage equipment.
Memory trick: Air in the system, recovery's a problem!