Regulations & SafetyCâu 73 / 240
A technician recovering R-404A from a walk-in freezer notices the recovery cylinder is getting cold and recovery has slowed. What technique safely speeds recovery?
a.Heat the recovery cylinder with a torch
b.Cool the recovery cylinder (e.g., with a wet cloth or ice) and/or recover liquid first to lower cylinder pressure
c.Vent some vapor to make room
d.Disconnect and let it finish on its own overnight
Giải thích
Recovery slows as the recovery cylinder warms and its pressure rises, so cooling the recovery cylinder and recovering liquid where possible lowers cylinder pressure and speeds the process. Using a torch is dangerous, venting vapor is illegal, and simply walking away does not complete recovery. Keeping the recovery cylinder cooler than the source lowers the pressure differential the machine must overcome.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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?
- A technician notices a disposable refrigerant cylinder labeled 'DOT-39.' What does this designation mean for handling?
- A service company keeps invoices showing refrigerant added to and recovered from customer appliances. Under Section 608, these records are important because:
- A technician is working with an A2L refrigerant such as R-32 or R-1234yf. What added safety consideration applies compared with older non-flammable HFCs?
- A technician using self-contained (active) recovery equipment on a high-pressure system should connect and operate it so that:
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