Type II — High-PressureCâu 153 / 240
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.Open the lines first, then recover whatever escapes
b.Recover the refrigerant into certified equipment and a proper cylinder, verify the required vacuum, then open the system
c.Vent the charge, then evacuate for cleanliness
d.Charge additional refrigerant before recovering to raise pressure
Giải thích
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.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A technician replaces a leaking evaporator on an R-410A system and must protect the new POE oil during the repair. Why is POE oil handling important?
- Virgin (newly produced) HCFC-22 was subject to a production and import phaseout. As of January 1, 2020, what happened to the supply of virgin R-22?
- A technician measures subcooling of 3°F on a TXV-equipped R-410A system when the manufacturer specifies 10°F of subcooling. What does the low subcooling most likely indicate?
- A technician performs a standing pressure (leak) test on a repaired Type II system using dry nitrogen. Over several hours the pressure holds steady with no drop. What does this indicate?
- A technician is selecting a vacuum pump to properly dehydrate a Type II R-410A system. Why is a dedicated vacuum pump used instead of the recovery machine to pull the final vacuum?
- A technician retrofitting an R-22 system to an HFC replacement changes the oil and refrigerant. Which additional component is most commonly replaced during the retrofit?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với EPA Section 608 Technician Certification Exam · Quy trình kiểm tra