Type III — Low-PressureCâu 187 / 240
During leak testing, some technicians raise the pressure in a low-pressure chiller just above atmospheric so that:
a.The rupture disk will vent
b.The refrigerant condenses faster
c.An electronic detector or bubble test can find the leak
d.The purge unit can be shut off permanently
Giải thích
Because the chiller normally runs in a vacuum, a leak pulls air in rather than out, so a detector cannot sense escaping refrigerant. Raising pressure slightly above atmospheric, staying under 10 psig, makes refrigerant flow outward at the leak so it can be found. The pressure must never approach the rupture-disk setting.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- R-1233zd is increasingly used in modern low-pressure chillers because it:
- Which statement about pressurizing a low-pressure appliance for leak detection is correct?
- A recovery cylinder used for a large low-pressure chiller should be:
- Low-loss fittings on recovery hoses are important on low-pressure work because they:
- Which refrigerant is a CFC once widely used in low-pressure chillers and now available only as reclaimed stock?
- A machine room housing a low-pressure chiller should have a refrigerant monitor and ventilation mainly to protect against:
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