Regulations & SafetyCâu 68 / 240
A technician charging a high-pressure R-410A system should be especially aware that, compared with R-22, R-410A operates at:
a.Much lower pressures, so standard R-22 gauges are fine
b.The same pressures as R-22
c.Lower pressures that pose no equipment concern
d.Significantly higher pressures, requiring properly rated gauges, hoses, and cylinders
Giải thích
R-410A operates at significantly higher pressures than R-22, roughly 50 to 70 percent higher, so technicians must use gauges, hoses, and recovery equipment rated for those pressures. Using R-22-rated equipment on R-410A is unsafe because it may not withstand the higher pressure. Matching equipment ratings to the refrigerant is a basic pressure-hazard precaution.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- After exceeding the leak rate threshold on a 50-plus-pound appliance and repairing the leak, the owner is generally required to:
- Which practice is safest when pressure-testing a system for leaks?
- A technician witnesses a coworker intentionally venting refrigerant to save time. Under EPA enforcement, what may EPA offer to individuals who report a violation?
- Where should refrigerant cylinders be stored to remain safe?
- A supply house offers small cans of R-134a to a walk-in DIY customer for a home refrigerator. Under Section 608 sales rules, what is the technician-buyer situation for such small-can HFC sales in stationary refrigeration?
- A technician plans to braze on a system. What is the correct sequence regarding the refrigerant charge before applying heat?
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Đội Ngũ Biên Tập PrepPass · Đối chiếu với EPA Section 608 Technician Certification Exam · Quy trình kiểm tra