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HVAC Refrigeration Cycle & System Charging (NATE)
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Avg score: 55% Most missed: “(Difficulty: easy) What is the state of refrigerant as it enters the evaporator?”
What you’ll learn This quiz builds your understanding of the refrigeration cycle, system pressures, and charging methods. The goal is to connect superheat, subcooling, and component behavior to system performance. Real-world example When a system is underperforming, charging it correctly depends on knowing whether the metering device and operating conditions support superheat or subcooling analysis. Many people search refrigeration cycle explained, superheat and subcooling, and NATE charging practice test. Tip + common mistake Always interpret charge readings in context with airflow and... Show more
HVAC Refrigeration Cycle & System Charging (NATE)
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11 Questions

1. (Difficulty: hard) What are the three condenser phases, and which phase produces subcooling?
2. (Difficulty: medium) What is the digital electronic scale feature that makes it most useful for charging a refrigeration system by weight?
3. (Difficulty: hard) A TXV system shows normal subcooling but the system is not cooling adequately. Where should diagnosis be directed?
4. (Difficulty: medium) When should the SUBCOOLING method be used to charge an HVAC system?
5. (Difficulty: hard) An R-410A TXV system has discharge pressure = 400 psig (saturation temp = 110°F). Liquid line temperature = 100°F. Manufacturer specifies 10°F subcooling. What is the diagnosis?
6. (Difficulty: medium) Suction pressure on an R-22 system reads 58 PSIG (saturation temp = 40°F). Suction line temperature is 65°F. What is the superheat, and what does it suggest?
7. (Difficulty: medium) Why must zeotropic refrigerant blends (such as R-407C) be charged as liquid from the cylinder?
8. (Difficulty: medium) What is the digital electronic scale feature that makes it most useful for charging a refrigeration system by weight?
9. (Difficulty: hard) What are the three condenser phases, and which phase produces subcooling?
10. (Difficulty: easy) What is the state of refrigerant as it enters the evaporator?
11. (Difficulty: medium) What is the correct method to determine the subcooling target for a TXV system when no charging chart is available?