EPA 608 PRACTICE FINAL EXAM
QUESTIONS WITH COMPLETE
ANSWERS
The maximum test pressure for leak testing a low-pressure centrifugal chiller is -
Answer-10 psig
Excessive operation of a purge system means - Answer-The system has a leak on the
sub-ambient pressure side of the system
For a commercial refrigeration system with a charge of 50 pounds or more refrigerant, a
substantial (or threshold) week rate will be reduced to ________ after January 1, 2019.
- Answer-20%
For a comfort cooling system with a charge of 50 pounds or more of refrigerant, a
substantial (or threshold) Leak rate will be reduced to _________ after January 1, 2019.
- Answer-10%
According to the EPA, when all the R-123 liquid has been removed from an average
350 ton R-123 chiller and the system vapor pressure is 0 psig, the system contains -
Answer-100 pounds of refrigerant in the system
When working with low pressure systems, the high-pressure cut off should be set to no
more than _________ to avoid damaging the system or activating the pressure blow off
device (rupture disk). - Answer-10 psig
The rupture discs on the low pressure chiller and on the recovery tank should relieve at
__________ to prevent damage to the system during refrigerant transfer into or out of
the system. - Answer-15 psig
If possible, the temperature of the equipment room where the chiller is located -
Answer-Should be increased to speed recovery
When possible, oil in the chiller should be heated because - Answer-Less refrigerant will
be soluble and/or trapped in the oil at higher temperatures
To prevent freezing, when recharging an evacuated water cooled chiller system with R-
123, first charge with a vapor 20 pressure of at least - Answer-20 in Hg vacuum
When recharging a chiller, refrigerant is first added as a vapor followed by a liquid
refrigerant to avoid - Answer-Freezing of the water in the chiller barrels
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller biggdreamer. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.