01
Front
What appliances does Type III certification cover?
Back
Type III covers servicing and disposing of low-pressure appliances, especially centrifugal chillers.
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 leak directions are possible in a low-pressure system?
Back
Air and moisture can leak inward, while refrigerant can leak outward.
03
Front
What does a purge unit remove from a low-pressure system?
Back
It removes air and other noncondensables that enter the system.
04
Front
What can frequent purge-unit operation indicate?
Back
Frequent or excessive operation is a warning sign of air ingress and may indicate a leak.
05
Front
How do psig and psia differ?
Back
Psig is pressure relative to atmosphere; psia is absolute pressure. Temperature-pressure charts generally use absolute pressure.
06
Front
What is the preferred sequence for leak-test pressurization?
Back
Use controlled heating first, such as hot water or a built-in device; use nitrogen afterward if needed and permitted.
07
Front
What is the maximum leak-test pressure for a low-pressure centrifugal chiller?
Back
The certification-review maximum is 10 psig.
08
Front
Which gases must never be used to pressurize a refrigeration system?
Back
Never use oxygen or compressed air to pressurize a refrigeration system.
09
Front
What evacuation level is required for low-pressure appliances?
Back
Evacuate to 25 mm Hg absolute, regardless of whether the recovery equipment was made before or after November 15, 1993.
10
Front
What can a pressure rebound after evacuation indicate?
Back
A pressure rebound can mean refrigerant is still boiling from liquid or escaping from oil; continue recovery as appropriate.
11
Front
How should chiller water be managed during evacuation?
Back
Circulate or remove water from the chiller tubes to prevent freezing.
12
Front
Why heat chiller oil before removing it, and to what temperature?
Back
Heat the oil to approximately 130°F to reduce refrigerant remaining in solution.
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