Refrigeration 2

When recovery of the refrigerant has been completed, how can the system be checked to see if there are pockets of cold liquid refrigerant?

• If the pressure rises to 5 psi or more with the system shut off for five minutes.

• If the pressure drops after the system is shut off for five minutes or more.

• If the pressure rises to 10 psi or more with the system shut off for five minutes or more.

• None of the answers

What is the meaning of the term "reclaimed"?

• To clean refrigerant for reuse.

• To remove refrigerant an d store it in an external container without testing or processing.

• To reprocess the refrigerant.

• None of these choices.

Purging is a term which describes _____.

• leakage of refrigerant into the atmosphere.

• removing unwanted air, vapors, dirt or moisture from a system.

• removing excess dirt from the atmosphere.

• adding refrigerant to a system.

What is a very important precaution one must take when filling refrigerant cylinders?

• Boey refirgerant color code.

• Never fill cylinders over 80% of capacity.

• Both A and B

• Never reuse refrigerant cylinders.

What is the meaning of the term "recycled"?

• To clean for reuse.

• To remove refrigerant and store it in an external container without testing or reprocessing.

• To reprocess refrigerant.

• None of these choices.

The primary method of removing refrigerant using recovery equipment is the _____ method.

• liquid recovery

• vapor recovery

• either A or B is acceptable

• method of recovery varies based upon the type of refrigerant used

Why is a purge cyle required on low pressure chillers?

• Operating pressure may be below atmospheric pressure.

• Because of the refrigerants low boiling point.

• Non-condensables in the system.

• Chiller may be opened for maintenance.

One method of recovering refrigerant from a chiller that is cost effective and meets EPA requirements is to _____.

• vapor recovery

• use a liquid pump

• recover liquid first, then vapor

• recover vapor first, the liquid

When using passive recovery on a system with a non-operating compressor, the recovery must be made through _____.

• low side only

• high side only

• both low and high sides

• can't be done

The maximum pressure of nitrogen when leak testing centrifugal systems is _____.

• 50 psig

• 10 psig

• 0 psig

• 25 psig