ESCO commercial refrigeration test
Study online at https://quizlet.com/_foha4r
1. When the compressor service valve is back seated, Service port
which port is closed?
2. The "low ambient control" is used to control Head pressure
3. In a dry type (direct expansion) evaporator, liquid re- Operate at high-efficiency
frigerant must boil away as close to the end of the coil
as possible in order to:
4. The difference between the temperature of the refrig- Evaporator superheat
erant boiling in the evaporator and the temperature
at the evaporator outlet is known as
5. An expansion device that is stuck open will cause A flooded evaporator
6. When measuring evaporator superheat on a commer- Compressor inlet
cial system that has a long suction line, the pressure
reading should be taken at the
7. Superheat measurements are best taken With the system operating
at design conditions
8. A technician is checking the superheat on a multi A blocked distributor
circuit evaporator and finds one of the circuits has a
superheat that is higher than the others. This could
be caused by
9. A TXV with an external equalizer is used on Evaporators with a high
pressure drop
10. Dry type evaporators operate most efficiently with the 8°F to 12°F
superheat setting of approximately
11. Overcharge of refrigerant
, ESCO commercial refrigeration test
Study online at https://quizlet.com/_foha4r
An evaporator used to chill liquids is operating with-
in normal superheat setting. But the system is not
cooling the product properly. Which of the following
is most likely the cause?
12. What time interval is required between each super- About 10 to 15 minutes
heat adjustment?
13. A low temperature evaporator used for cooling space Must be defrosted peri-
or product refrigeration odically
14. Some special applications use a flooded evaporator Low side float
(operated full of refrigerant) in order to maintain the
proper level of liquid refrigerant, a ______ type devices
used.
15. A properly functioning condenser will first De-superheat, then
sub-cool
16. The effect of an inefficient water cooled condenser will Act the same as an air
cooled condenser
17. The refrigerant condensing temperature in a water 10°F
cooled condenser is normally about _____ higher than
the leaving water.
18. The refrigerant and an air cooled condenser will nor- 30°F
mally contends at approximately _____ higher temper-
ature than the air passing over it.
19. Workable head pressure during periods of low ambi- Fan cycle control
ent temperature can be achieved by using
20.
Study online at https://quizlet.com/_foha4r
1. When the compressor service valve is back seated, Service port
which port is closed?
2. The "low ambient control" is used to control Head pressure
3. In a dry type (direct expansion) evaporator, liquid re- Operate at high-efficiency
frigerant must boil away as close to the end of the coil
as possible in order to:
4. The difference between the temperature of the refrig- Evaporator superheat
erant boiling in the evaporator and the temperature
at the evaporator outlet is known as
5. An expansion device that is stuck open will cause A flooded evaporator
6. When measuring evaporator superheat on a commer- Compressor inlet
cial system that has a long suction line, the pressure
reading should be taken at the
7. Superheat measurements are best taken With the system operating
at design conditions
8. A technician is checking the superheat on a multi A blocked distributor
circuit evaporator and finds one of the circuits has a
superheat that is higher than the others. This could
be caused by
9. A TXV with an external equalizer is used on Evaporators with a high
pressure drop
10. Dry type evaporators operate most efficiently with the 8°F to 12°F
superheat setting of approximately
11. Overcharge of refrigerant
, ESCO commercial refrigeration test
Study online at https://quizlet.com/_foha4r
An evaporator used to chill liquids is operating with-
in normal superheat setting. But the system is not
cooling the product properly. Which of the following
is most likely the cause?
12. What time interval is required between each super- About 10 to 15 minutes
heat adjustment?
13. A low temperature evaporator used for cooling space Must be defrosted peri-
or product refrigeration odically
14. Some special applications use a flooded evaporator Low side float
(operated full of refrigerant) in order to maintain the
proper level of liquid refrigerant, a ______ type devices
used.
15. A properly functioning condenser will first De-superheat, then
sub-cool
16. The effect of an inefficient water cooled condenser will Act the same as an air
cooled condenser
17. The refrigerant condensing temperature in a water 10°F
cooled condenser is normally about _____ higher than
the leaving water.
18. The refrigerant and an air cooled condenser will nor- 30°F
mally contends at approximately _____ higher temper-
ature than the air passing over it.
19. Workable head pressure during periods of low ambi- Fan cycle control
ent temperature can be achieved by using
20.
