Type II — High-Pressure第 153 / 240 题
Before opening a Type II system for a compressor change, a technician recovers the refrigerant. Which sequence best protects both the technician and the environment?
a.Charge additional refrigerant before recovering to raise pressure
b.Recover, verify the vacuum, then open it
c.Vent the charge, then evacuate for cleanliness
d.Open the lines first, then recover whatever escapes
解析
The correct sequence is to recover the refrigerant into certified recovery equipment and an approved cylinder, confirm the required evacuation level is reached, and only then open the system. Opening the lines first or venting releases refrigerant illegally. Recovery before service both prevents emissions and keeps the technician safe from a sudden refrigerant release.
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