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ESCO Light Commercial Refrigeration EXAM
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ESCO Light Commercial Refrigeration EXAM
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ESCO Light Commercial Refrigeration EXAM5% - ANSWER If converting from mineral oil to POE oil, what is considered to be the
industry standard for residual mineral oil content?
Refractometer
Oil conversion test kit - ANSWER When converting to POE from mineral oil, what
can be used to determine residual mineral oil content?
Global warming potential (GWP) - ANSWER Some refrigerants are now being
phased out due to their
HCFC - ANSWER Which currently used refrigerant category is quickly disappearing
due to its ozone depletion potential?
404a - ANSWER An orange refrigerant container is typically
Ternary blend - ANSWER When three refrigerants make up a new refrigerant it is
considered to be a
Temperature glide - ANSWER The difference between bubble point and dew point
temperatures is called
HC - ANSWER Which of the following categories of refrigerant is least harmful to the
environment?
R-290 - ANSWER One of the refrigerants now being used in small refrigerant
quantities in self-contained systems is
400 - ANSWER Which "series" of refrigerants should be charged into a system as a
liquid?
The separation of a blended refrigerant in the evaporator or condenser - ANSWER
What is fractionation?
POE - ANSWER Which of the following oils may be used with most typical
refrigerants used today?
Hygroscopicity - ANSWER The term used to describe the ability to hold moisture is
known as
134a - ANSWER A light blue refrigerant container is typically
POE - ANSWER Which oil is shipped in metal containers?
Dew point temperature - ANSWER A 400 series refrigerant should use_______
when calculating superheat.
, In the liquid state, but in a controlled metered condition into the suction side -
ANSWER A blend should be charged
Polyolester (POE) - ANSWER Which of the following lubricants is considered the
most hygroscopic used in stationary refrigeration equipment?
Chlorine - ANSWER The main chemical that harms the ozone layer is
502 - ANSWER What refrigerant was mainly used in low temp refrigeration before
HFC 404a was created?
Perform a pump out procedure as per the unit's operating instructions - ANSWER
When switching from one refrigerant type to another you should do what?
True - ANSWER A working system may result in a quicker recovery rate by allowing
it to operate and purge liquid directly into the recovery cylinder.
More than 80% full - ANSWER A recovery cylinder should never be filled
Recovery - ANSWER The removal of refrigerant in any state from a system is called
42 pounds - ANSWER Which of the following would be a correctly filled "30 pound"
recovery cylinder if it weighs 18 pounds when empty?
As long as it meets AHRI standard 700 - ANSWER Refrigerant can be resold to a
new owner if it is
100% of total charge - ANSWER How much can a refrigeration system containing 18
pounds of refrigerant legally leak annually according to EPA rules?
There is no limitation to putting refrigerant back into the same system as long as it is
not contaminated - ANSWER Recovered refrigerant cannot be placed back into the
system it has been recovered from unless
Condition of recovered refrigerant - ANSWER To determine the full weight of a
recovery cylinder, which of the following IS NOT required to be known
False - ANSWER It is still necessary to recover the entire refrigerant when a section
of the system can be isolated with service valves
HFC-404a - ANSWER Which of the following refrigerant(s) is/are required to be
recovered as per EPA rules? (Check all that apply)
Liquid - ANSWER It is best to remove refrigerant in what state?
Any of the above can be used since the HFC refrigerants are not harmful to the
ozone layer. However, EPA states R-22 and nitrogen is the "standard" leak detection
gas. - ANSWER What approved gas/gases may be used for leak detection in all
refrigerant systems?
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