EPA Section 608 Universal Certification ExamType II (High-Pressure Appliances)Hard
Which of the following conditions would prevent a technician from using a system-dependent recovery device on a high-pressure appliance?
- AThe compressor is not operational.
- BThe system has a small charge of 5 pounds.
- CThe system has service ports on both high and low sides.
- DThe ambient temperature is 70°F.
Show answer & explanationAnswer & explanation
Correct answer: A. The compressor is not operational.
System-dependent recovery devices often rely on the appliance's own compressor or the pressure differential created by the compressor to push refrigerant out. If the compressor is not operational, a system-dependent device will be ineffective, and a self-contained (active) recovery unit would be required.
Why the other options are wrong
- B. A small charge does not prevent the use of system-dependent recovery; it might even make it easier if the compressor is working.
- C. Having service ports on both sides is beneficial for recovery, not a hindrance.
- D. Ambient temperature affects recovery speed but doesn't prevent system-dependent recovery, although colder temperatures can slow it down.
System-Dependent Recovery Limitations
System-dependent recovery, also known as passive recovery, relies on the appliance's internal components or ambient conditions to facilitate refrigerant transfer, making it unsuitable for certain scenarios.
- Often requires the appliance's compressor to be operational.
- Less efficient than self-contained units, especially with large charges.
- May be limited by ambient temperature and system components.
Memory trick: Passive recovery needs system life, if the compressor's dead, it causes strife.