Type II — High-PressureCâu 141 / 240
A technician measures 12°F of superheat on a fixed-orifice R-22 system but the manufacturer's chart calls for 20°F at those conditions. What does the low superheat suggest?
a.The system is undercharged
b.There is a restriction in the liquid line
c.The metering device must be a TXV
d.The system is likely overcharged
Giải thích
On a fixed-orifice system, superheat lower than the target usually indicates an overcharge, because too much refrigerant floods the evaporator and less of it boils off. To correct it, the technician recovers a small amount and rechecks superheat against the chart. High superheat, by contrast, typically points to an undercharge or restriction.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A technician handles a high-pressure refrigerant cylinder in a hot truck bed in summer. Which practice is safest for storing and transporting the cylinder?
- A technician sets up push-pull recovery on a system with a large liquid charge. How does the push-pull method work?
- A very-high-pressure appliance using R-13 must have its refrigerant recovered before service. Using recovery equipment made after November 15, 1993, what is the required evacuation level?
- During recovery from a Type II system, a technician sees noncondensable gases (air) collected in the recovery cylinder. What is the correct handling under Section 608?
- A DOT-approved refrigerant recovery cylinder must be periodically retested for safety. What is the standard hydrostatic retest interval for these cylinders?
- A technician wants a quick way to know whether a recovery cylinder is a refrigerant recovery cylinder by its color scheme. What is the standard color for a refrigerant recovery cylinder?
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