CFC Commercial Refrigeration Systems 4

Question 1

Under EPA Section 608, which of the following is NOT considered a violation when servicing commercial refrigeration equipment?

Accepted Answer

Recovering refrigerant before opening the system

Answer

Recovering refrigerant before opening the system is the required and compliant practice under EPA Section 608.

Question 2

A commercial condensing unit is located on a rooftop and experiences high ambient temperatures in summer. Which control would help protect the compressor from overheating?

Accepted Answer

High-pressure cutout switch

Answer

A high-pressure cutout switch shuts down the compressor when discharge pressure exceeds a safe limit caused by high ambient temperatures and poor heat rejection.

Question 3

In a commercial refrigeration system, subcooling of liquid refrigerant before the metering device primarily:

Accepted Answer

Increases refrigerating effect and prevents flash gas

Answer

Subcooling cools the liquid below its saturation temperature, increasing refrigerating effect and preventing flash gas formation at the metering device inlet.

Question 4

A commercial supermarket case is experiencing short cycling of the compressor. Which condition is most likely causing this?

Accepted Answer

Low-pressure cutout set too high or system low on charge

Answer

A low-pressure cutout set too high or insufficient refrigerant charge causes suction pressure to rapidly drop below the cutout setpoint, causing frequent short cycling.

Question 5

Which refrigerant was the first to be phased out under the Montreal Protocol due to its high ozone depletion potential (ODP)?

Accepted Answer

R-11 (CFC-11)

Answer

R-11 (CFC-11) has an ODP of 1.0 and was among the first refrigerants targeted for elimination under the Montreal Protocol's initial phase-out schedule.

(CFC) Chlorofluorocarbon Certification Practice Test

(CFC) Chlorofluorocarbon Certification Practice Test

CFC Commercial Refrigeration Systems 4