Core
ozone consists of molecules containing _______.
3 oxygen atoms
there no such thing as a _____ substitute.
drop in
a deep vacuum is measured in _______.
microns
the system should be checked for leaks if the pressure in a system rises from ______ to a level above ______.
1MM HG, 2.5 MM HG
comfort, commercial, and industrial
_____ removes refrigerants without the assistance of the appliance
self contained recovery device
_____ is a very high-pressure refrigerant and generally does not need to be recovered
carbon dioxide
_______ is the easiest way to check the type of refrigerant.
nameplate
all pressure valves should be piped or installed in ______, never ______.
parallel, series
the US is part of the ____, which is a international treaty that addresses ozone depletion.
Montreal protocol
section 608 of the _______ sets forth the rules and regulations for refrigerants
clean air act
self-contained recovery devices must be able to recover _______ of the refrigerant when the compressor is operating.
90%
when first time inspecting a hermetic system known to be leaking, you should ______.
search for traces of oil
the use of a oversized vacuum pump can cause _______.
freezing of trapping water
the compound gauge measures system pressure for the ______ in pounds per inch (psig)
low side
upon completion of a leak repair, before recharging the system, install a new ______, and complete a standing prssure leak check
filter drier
when using nitrogen, you must have a _______ on the nitrogen tank.
regulator
after assembly, the unit should be pressurized with ______.
nitrogen
before disposing a low-pressure appliance, the refrigerant must be recovered to ______.
25mm of HG absolute
a medium pressure with a full charge of 200 lbs must be evacuated to a vacuum of ______
15 hg
_______ refrigerants mixtures are mixtures of components that have different boiling points
zeotropic or non-azeotropic
if a tech suspects contamination in his recovery cylinder, a ______ should be taken and compared to the _______.
pressure measurement, PT chart
if the system operates with excessive superheat, then a leak in the ______ is suspected
high pressure capillary tube system
excessive running of _____ in a low-pressure chiller generally indicates a leaking system.
purge unit
you can be fined _______ per day, per violation, for violation of the clean air act.
44,539$ (rounding is allowed)