01
Front
What can a leak in a low-pressure chiller evaporator draw into the system?
Back
Because the evaporator may be below atmospheric pressure, a leak can draw air and moisture into the system.
Free Online Flashcard Deck
4 Type III: Low-Pressure Appliances Free Online FlashCards
Study 4 Type III: Low-Pressure Appliances with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
12 cards
02
Front
What does a chiller purge unit remove?
Back
A purge unit removes air and other noncondensable gases from a low-pressure system.
03
Front
What happens in a chiller evaporator?
Back
In the evaporator, low-pressure liquid refrigerant absorbs heat from circulating water and boils into vapor, chilling the water.
04
Front
What methods are preferred for pressurizing a low-pressure chiller for leak testing?
Back
Controlled hot water or a built-in heating/pressurization device is preferred for leak testing a low-pressure chiller.
05
Front
What gas and safeguards should be used when nitrogen is used for pressurization?
Back
Use dry nitrogen with a pressure regulator and relief protection; never use oxygen or compressed air.
06
Front
In what order should refrigerant be recovered when practical?
Back
Recover liquid refrigerant first when practical, then recover the remaining vapor to speed recovery.
07
Front
How can tube water be protected from freezing during chiller evacuation?
Back
During chiller evacuation, circulate or remove water from the tubes as appropriate to prevent freezing as refrigerant pressure and temperature fall.
08
Front
What precautions apply before removing oil from a low-pressure appliance?
Back
Heat the oil to about 130°F before removal. The appliance or isolated section must be at no more than 5 psig, unless the oil is drained into a receiver brought to that pressure.
09
Front
What is the standard evacuation target for a low-pressure appliance?
Back
The standard Section 608 evacuation target for a low-pressure appliance is 25 mm Hg absolute.
10
Front
What can a pressure rise after reaching the recovery endpoint indicate?
Back
A pressure rise can mean refrigerant is still boiling from liquid or oil; continue recovery as needed.
11
Front
Which refrigerant phase should be introduced first when recharging a centrifugal chiller?
Back
Introduce vapor before liquid to reduce the risk of freezing water in the tubes.
12
Front
What is the maximum fill level for a refrigerant recovery cylinder?
Back
Never fill a refrigerant recovery cylinder above 80% capacity.
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