Refrigeration Systems Flashcards

What is the primary refrigerant used in most modern commercial food equipment refrigeration systems?

Answer: R-404A

R-404A is widely used in commercial food refrigeration due to its compatibility with medium and low temperature applications.

Which component in a refrigeration system is responsible for removing heat from the refrigerant?

Answer: Condenser

The condenser releases heat absorbed by the refrigerant to the surrounding environment, completing the refrigeration cycle.

What does superheat indicate in a refrigeration system?

Answer: Temperature rise of vapor above its saturation point

Superheat is the number of degrees the refrigerant vapor is above the boiling point at a given pressure, ensuring no liquid enters the compressor.

A technician measures a high head pressure and normal suction pressure in a walk-in cooler. The most likely cause is:

Answer: Dirty condenser coils

Dirty condenser coils restrict airflow and heat transfer, causing head pressure to rise above normal operating range.

What is the purpose of a receiver in a commercial refrigeration system?

Answer: Store extra refrigerant and ensure liquid feed to the expansion device

The receiver stores liquid refrigerant to accommodate system load variations and ensures a steady liquid supply to the expansion device.

When recovering refrigerant from commercial equipment, technicians must comply with which EPA regulation?

Answer: Section 608 of the Clean Air Act

EPA Section 608 requires technicians to recover refrigerants using certified equipment and prohibits intentional venting of regulated refrigerants.