CFESA Refrigeration Chapter 25 Exam Q’s and A’s

CFESA Refrigeration Chapter 25 Exam Q’s and A’s
Q - -A

- - -A

- Low subcooling and high superheat on a cap tube system indicates what? -
-

- What does high subcooling and high superheat indicate on a cap tube
system? - -

- What does excessive evaporator temperature drop and low superheat
indicate? - -

- The most efficient freezer operates at what superheat? - -

- What does high condenser temperature rise and high head pressure
indicate? - -

- Normal evaporator superheat and high compressor superheat indicates a
problem where? - -

- A condensing temperature of 290 degrees F tells us what in regards to the
compressor? - -

- Low superheat, high evaporator temperature drop, along with high head
pressure and high subcooling tells you what? - -

- A walk cooler has normal head pressure, subcooling, and evaporator
temperature drop. The box temperature is near 38 degrees and the
superheat is 1 degree F. What needs to be done? - -

- A walk in freezer compressor keeps tripping the overload. The evaporator
head pressure is normal as is the condenser temperature rise. The superheat
is 10 degrees F. The evaporator temperature drop is low. The compressor
superheat is 40 degrees. The suction pressure at the evaporator is 60 Psi,
and at the compressor suction service valve the pressure reads 40 Psi. What
is the problem? - -

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