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When a unit is opened for servicing, the filter-drier should always be replaced.
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The phase of the refrigerant in the receiver of refrigeration system is _______
Low temperature high pressure liquid
When should an oil sample be taken?
Compressor burn out
A crankcase heater is often used to prevent refrigerant from being mixed with compressor oil during periods of _____.
Low ambient temperature
Which condition allows for a system to be opened and repaired without recovering the refrigerant to the required vacuum level?
A system with a large leak and internal pressure of 0 psig
What is the most prefered gas for leak detection in a high pressure system?
EPA regulations require that all Industrial Process Refrigeration (IPR) systems containing more than 50 pounds of refrigerant MUST be repaired when the annual leak rate exceeds _____.
Any person repairing or disposing of a high pressure system must have _______.
EPA Type 2 certification
A recovery machine that uses a hermetic compressor will overheat when drawing a deep vacuum because _______.
the motor needs the flow of refrigerant through the compressor to provide motor cooling.
A refrigerant system is dehydrated to _______
Remove the water and moisture
If the system has a normal charge of 80 pounds, which of the following is the method to charge this system?
Charge with liquid through liquid line service valve
Which of the following is a perfect leak checking method for a built-up system before it is charged?
Pressurizing the system with inert gas
As per ASHRAE Standard 15, which of the following refrigerants requires equipment room monitoring?
Refrigerant leaves the receiver of a system as a _____.
high pressure liquid.