ESCO LIGHT COMMERCIAL
REFRIGERATION CERTIFICATION
EVALUATION 2026 FULL SOLUTION VIEW
AHEAD QUESTIONS
◉ In a dry type (direct expansion) evaporator, liquid refrigerant
must boil away as close to the end of the coil as possible in order to:
Answer: Operate at high efficiency
◉ The difference between the temperature of the refrigerant boiling
in the evaporator and the temperature at the evaporator outlet is
known as:
Answer: Evaporator superheat.
◉ An expansion device that is stick open will cause:
Answer: A flooded evaporator
◉ Superheat measurements are best taken:
Answer: With the system operating at design conditions.
,◉ A technician is checking the superheat on a multi-circuit
evaporator and finds one of the circuits has a superheat that is
higher than the others. This could be caused by:
Answer: A blocked distributor
◉ A TEV with an external equalizer is used on:
Answer: Evaporators with a high pressure drop
◉ Dry type evaporators operate most efficiently with a superheat
setting of approximately:
Answer: 8*F to 12*F
◉ An evaporator used to chill liquids is operating with a normal
superheat setting, but the system is not cooling the product properly.
Which of the following is the most likely cause?
Answer: overcharge of refrigerant
◉ What time interval is required between each superheat
adjustment?
Answer: 10 to 15 min
◉ When measuring evaporator superheat on a commercial system
that has a long suction line, the pressure reading should be taken at
the:
, Answer: Evaporator outlet
◉ A low temperature evaporator used for cooling space or product
refrigeration:
Answer: Must be defrosted periodically
◉ Some special application use a flooded evaporator (operated full
of refrigerant). In order to maintain the proper level of liquid
refrigerant, a _____ type metering device is used.
Answer: Low side float.
◉ A properly functioning condenser will first:
Answer: De-superheat, then sub-cool.
◉ The refrigerant condensing temperature in a water cooled
condenser in normally about ____ higher than the leaving water.
Answer: 10*F
◉ Workable head pressure during periods of low ambient
temperature can be achieved by using:
Answer: Fan-cycle control
REFRIGERATION CERTIFICATION
EVALUATION 2026 FULL SOLUTION VIEW
AHEAD QUESTIONS
◉ In a dry type (direct expansion) evaporator, liquid refrigerant
must boil away as close to the end of the coil as possible in order to:
Answer: Operate at high efficiency
◉ The difference between the temperature of the refrigerant boiling
in the evaporator and the temperature at the evaporator outlet is
known as:
Answer: Evaporator superheat.
◉ An expansion device that is stick open will cause:
Answer: A flooded evaporator
◉ Superheat measurements are best taken:
Answer: With the system operating at design conditions.
,◉ A technician is checking the superheat on a multi-circuit
evaporator and finds one of the circuits has a superheat that is
higher than the others. This could be caused by:
Answer: A blocked distributor
◉ A TEV with an external equalizer is used on:
Answer: Evaporators with a high pressure drop
◉ Dry type evaporators operate most efficiently with a superheat
setting of approximately:
Answer: 8*F to 12*F
◉ An evaporator used to chill liquids is operating with a normal
superheat setting, but the system is not cooling the product properly.
Which of the following is the most likely cause?
Answer: overcharge of refrigerant
◉ What time interval is required between each superheat
adjustment?
Answer: 10 to 15 min
◉ When measuring evaporator superheat on a commercial system
that has a long suction line, the pressure reading should be taken at
the:
, Answer: Evaporator outlet
◉ A low temperature evaporator used for cooling space or product
refrigeration:
Answer: Must be defrosted periodically
◉ Some special application use a flooded evaporator (operated full
of refrigerant). In order to maintain the proper level of liquid
refrigerant, a _____ type metering device is used.
Answer: Low side float.
◉ A properly functioning condenser will first:
Answer: De-superheat, then sub-cool.
◉ The refrigerant condensing temperature in a water cooled
condenser in normally about ____ higher than the leaving water.
Answer: 10*F
◉ Workable head pressure during periods of low ambient
temperature can be achieved by using:
Answer: Fan-cycle control
