Exam (elaborations)
ESCO Light Commercial Refrigeration EXAM 2022
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ESCO Light Commercial Refrigeration EXAM 2022
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ESCO Light Commercial Refrigeration EXAM2024/2025 with Complete Solutions.
If converting from mineral oil to POE oil, what is considered to be the industry
standard for residual mineral oil content? - ANSWER 5%
When converting to POE from mineral oil, what can be used to determine residual
mineral oil content? - ANSWER Refractometer
Oil conversion test kit
Some refrigerants are now being phased out due to their - ANSWER Global
warming potential (GWP)
Which currently used refrigerant category is quickly disappearing due to its ozone
depletion potential? - ANSWER HCFC
An orange refrigerant container is typically - ANSWER 404a
When three refrigerants make up a new refrigerant it is considered to be a -
ANSWER Ternary blend
The difference between bubble point and dew point temperatures is called -
ANSWER Temperature glide
Which of the following categories of refrigerant is least harmful to the environment? -
ANSWER HC
One of the refrigerants now being used in small refrigerant quantities in self-
contained systems is - ANSWER R-290
Which "series" of refrigerants should be charged into a system as a liquid? -
ANSWER 400
What is fractionation? - ANSWER The separation of a blended refrigerant in the
evaporator or condenser
Which of the following oils may be used with most typical refrigerants used today? -
ANSWER POE
The term used to describe the ability to hold moisture is known as - ANSWER
Hygroscopicity
A light blue refrigerant container is typically - ANSWER 134a
Which oil is shipped in metal containers? - ANSWER POE
, A 400 series refrigerant should use_______ when calculating superheat. - ANSWER
Dew point temperature
A blend should be charged - ANSWER In the liquid state, but in a controlled
metered condition into the suction side
Which of the following lubricants is considered the most hygroscopic used in
stationary refrigeration equipment? - ANSWER Polyolester (POE)
The main chemical that harms the ozone layer is - ANSWER Chlorine
What refrigerant was mainly used in low temp refrigeration before HFC 404a was
created? - ANSWER 502
When switching from one refrigerant type to another you should do what? -
ANSWER Perform a pump out procedure as per the unit's operating instructions
A working system may result in a quicker recovery rate by allowing it to operate and
purge liquid directly into the recovery cylinder. - ANSWER True
A recovery cylinder should never be filled - ANSWER More than 80% full
The removal of refrigerant in any state from a system is called - ANSWER Recovery
Which of the following would be a correctly filled "30 pound" recovery cylinder if it
weighs 18 pounds when empty? - ANSWER 42 pounds
Refrigerant can be resold to a new owner if it is - ANSWER As long as it meets
AHRI standard 700
How much can a refrigeration system containing 18 pounds of refrigerant legally leak
annually according to EPA rules? - ANSWER 100% of total charge
Recovered refrigerant cannot be placed back into the system it has been recovered
from unless - ANSWER There is no limitation to putting refrigerant back into the
same system as long as it is not contaminated
To determine the full weight of a recovery cylinder, which of the following IS NOT
required to be known - ANSWER Condition of recovered refrigerant
It is still necessary to recover the entire refrigerant when a section of the system can
be isolated with service valves - ANSWER False
Which of the following refrigerant(s) is/are required to be recovered as per EPA
rules? (Check all that apply) - ANSWER HFC-404a
It is best to remove refrigerant in what state? - ANSWER Liquid
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