EPA Section 608 Universal Certification ExamType I (Small Appliances)Hard
A technician is performing a recovery on a small appliance that uses R-290 (propane). Which of the following statements about using a manifold gauge set for this procedure is true?
- AManifold gauge sets are not required for R-290 recovery; direct connections are preferred.
- BR-290 can be recovered using any manifold gauge set, provided the hoses are in good condition.
- CManifold gauge sets used for R-290 must be specifically designed and rated for flammable refrigerants.
- DStandard manifold gauge sets are suitable for R-290 as long as they are cleaned.
Show answer & explanationAnswer & explanation
Correct answer: C. Manifold gauge sets used for R-290 must be specifically designed and rated for flammable refrigerants.
R-290 (propane) is a highly flammable refrigerant. Therefore, all equipment, including manifold gauge sets, must be specifically designed and rated for use with flammable refrigerants to prevent ignition sources and ensure material compatibility.
Why the other options are wrong
- A. Manifold gauges are essential for monitoring pressure during recovery, and direct connections don't provide this functionality safely.
- B. This is incorrect; standard gauges are not suitable for flammable refrigerants.
- D. Cleaning is insufficient; material compatibility and non-sparking features are crucial for flammable refrigerants.
Flammable Refrigerant Tooling
Tools and equipment, such as manifold gauge sets, used with flammable refrigerants (e.g., R-290) must be specifically designed and rated for such refrigerants to ensure safety and prevent ignition.
- Flammable refrigerants require specialized equipment.
- Tools must be non-sparking and material-compatible.
- Prevents accidental ignition and equipment failure.
- Standard tools are not safe for these refrigerants.
Memory trick: Flammable gas needs special gear, banishing all fear!