CFESA Refrigeration Systems 3

Question 1

Which refrigerant requires technicians to hold an EPA Section 608 Type II certification to service?

Accepted Answer

R-404A in commercial refrigeration above 50 lbs

Answer

EPA Section 608 Type II certification is required for servicing high-pressure commercial and industrial refrigeration systems containing more than 50 lbs of refrigerant.

Question 2

What does a refrigeration system's COP (Coefficient of Performance) measure?

Accepted Answer

Ratio of cooling effect to energy input

Answer

COP measures refrigeration system efficiency by dividing the cooling capacity by the power input, with higher values indicating greater efficiency.

Question 3

In a parallel rack refrigeration system used in supermarkets, which component controls refrigerant distribution to multiple display cases?

Accepted Answer

Electronic expansion valves and case controllers

Answer

Electronic expansion valves paired with individual case controllers precisely meter refrigerant flow to each display case in a parallel rack system.

Question 4

The purpose of a crankcase pressure regulator (CPR) valve in a refrigeration system is to:

Accepted Answer

Limit suction pressure entering the compressor during pulldown

Answer

A CPR valve prevents excessive suction pressure from reaching the compressor during initial pulldown, protecting the motor from overload.

Question 5

What causes a compressor to short cycle in a commercial refrigeration unit?

Accepted Answer

Low refrigerant charge causing rapid pressure equalization

Answer

A low refrigerant charge can cause the low-pressure control to cycle the compressor on and off rapidly as pressures equalize quickly.

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA Refrigeration Systems 3