A technician suspects a disposable (single-use) refrigerant cylinder is nearly empty. What is the correct handling under Section 608 practice?
Explanation
The small amount of refrigerant left in a 'empty' disposable cylinder, called the heel, must be recovered before the cylinder is discarded, because venting it is illegal. Disposable DOT-39 cylinders must never be refilled, and puncturing a cylinder that still holds refrigerant would vent it. Only after the heel is recovered can the cylinder be safely rendered empty and recycled per local rules.
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