Which of the following represents a...

Which of the following represents a low-pressure refrigerant as defined by EPA regulation?

🔍 Key Concepts

• EPA refrigerant pressure categories (low, medium, high) for appliance servicing • Typical operating pressures of common refrigerants (R-12, R-22, R-502, R-123) in HVAC/refrigeration systems • Association between refrigerant type (CFC, HCFC, HFC) and common system applications (centrifugal chiller vs. residential AC, etc.)

💭 Think About

• Think about which of these refrigerants is commonly used in large centrifugal chillers that operate at very low pressures, often in commercial buildings. • Recall that low-pressure refrigerants typically have a lower saturation pressure at normal chiller operating temperatures compared to those used in residential air conditioning or freezers. • Consider which of these refrigerants you would expect to see in a low-pressure chiller versus a medium- or high-pressure system.

✅ Before You Answer

• Verify which refrigerant category the EPA assigns to each option: low-pressure, medium-pressure, or high-pressure for appliance servicing rules. • Check which refrigerant has a saturation pressure below atmospheric pressure at typical chiller operating temperatures (around 40°F to 50°F). • Confirm which refrigerant is commonly associated with centrifugal chillers rather than with small refrigeration or residential AC units.

🔍 Key Concepts

💭 Think About

✅ Before You Answer