Type III — Low-PressureCâu 170 / 240
40 CFR §82.152 classifies appliances by their refrigerant's liquid-phase saturation pressure at 104°F. Which range makes an appliance low-pressure?
a.Below 45 psia
b.45 to 170 psia
c.170 to 355 psia
d.Above 355 psia
Giải thích
A low-pressure appliance uses a refrigerant with a saturation pressure below 45 psia at 104°F (R-11, R-123, R-113, R-245fa). (b) 45–170 psia is medium-pressure (R-12, R-134a, R-500); (c) 170–355 psia is high-pressure (R-22, R-407C, R-410A); (d) above 355 psia, or a critical temperature below 104°F, is very-high-pressure (R-13, R-23, R-503). Older guides describe the classes by boiling point, but the regulation uses these pressure bands, and the class decides which row of the evacuation table applies.
Trích dẫn luật: 40 CFR §82.152Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
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Câu hỏi liên quan cùng chủ đề
- Water entering the refrigerant side of a low-pressure chiller through a leaking tube is dangerous mainly because it can:
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