RefrigerationCâu 61 / 110
On a fixed-orifice (piston) system, which method is generally used to check the charge?
a.Subcooling only
b.The superheat method using target superheat charts
c.Weighing the compressor
d.Measuring duct static pressure
Giải thích
Fixed-orifice metering devices are charged by the superheat method, comparing measured superheat to a target based on indoor wet-bulb and outdoor dry-bulb temperatures. TXV systems, by contrast, are typically charged by subcooling. Using the correct method for the metering device is essential.
Luyện miễn phí toàn bộ 110 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A technician measures a suction pressure whose saturation temperature is 40 F and a suction line temperature of 52 F. What is the superheat?
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- Under EPA Section 608, what must a technician do with refrigerant before opening most systems for service?
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