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608 EPA Core (Questions/Answers)
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608 EPA Core (Questions/Answers)
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608 EPA Core (Questions/Answers)What factor affects the speed of evacuation? Correct Ans - the size of
the equipment
the ambient temperature
the amount of moisture in the system
The evacuation of a system is a method of: Correct Ans - dehydration
When moisrture exists in an operating system which is likely to occur?
Correct Ans - Acid will form
The over-evacuation of a system: Correct Ans - does not occur
A system is considered dehydrated when: Correct Ans - the vacuum
indicator shows you have reached & held the required finished vacuum
When evacuating a system the hoses should be: Correct Ans - equal to
or larger than the vacuum pump inlet connection
When evacuating a system the hoses should be: Correct Ans - short in
length & as large in diameter as possible
When operating refrigerant recovery or recycling equipment the following
precautions should be taken Correct Ans - safety glasses & gloves
along with following equipment safety precautions
The color code for refrigerant recovery cylinders is Correct Ans -
yellow tops with grey bodies
Never use oxygen or compressed air to pressurize a sytem because:
Correct Ans - when mixed with compresser oil or some refrigerants it
could explode
When using any solvent, chemical, cleaner, chemical or refrigerant you should
review Correct Ans - MSDS (data sheets)
, Refrigerant vapors or mist should not be inhaled because Correct Ans -
they may cause heart irregularities & or unconsciousness
When using recovery unit the fill level of the recovery tank can be controlled
by Correct Ans - mechanical float switch
electronic shutt-off device
weight
what type of refrigerant is clorine free Correct Ans - HFC's
HCFC Correct Ans - R-22
R-123
R-124
it is necessary to place a refrigerant label on: Correct Ans - a frigerant
cylinder that is being returned for reclaiming
DOT requires youdo this when transporting cylinders Correct Ans -
attach DOT classification tags
It is illegal to Correct Ans - knowingly release refrigerant during the
service, maintenance, repair or disposal of appliances with the exception of de
minimis releases
The type of oil that is most commonly used in stationary refrigertion
applications with HFC-134a refrigerant is: Correct Ans - ester oil
The high pressure guage on service manifold sets has a contiuous scale, usall
calibrated to read from: Correct Ans - 0-500 psi.
When a systemwill not hold a vacuum after it has been evauated, then:
Correct Ans - the system may be leaking
Long hoses between the unit & the recovery machine should not be used
because they cause: Correct Ans - excessive pressure drop
increased recovery time
increased emissions
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