When a unit is opened for servicing, the ________ should always be replaced.

The phase of the refrigerant in the receiver of refrigeration system is _______

When should an oil sample be taken?

A crankcase heater is often used to prevent refrigerant from being mixed with compressor oil during periods of _____.

Which condition allows for a system to be opened and repaired without recovering the refrigerant to the required vacuum level?

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 _______.

A recovery machine that uses a hermetic compressor will overheat when drawing a deep vacuum because _______.

A refrigerant system is dehydrated to _______

If the system has a normal charge of 80 pounds, which of the following is the method to charge this system?

Which of the following is a perfect leak checking method for a built-up system before it is charged?

As per ASHRAE Standard 15, which of the following refrigerants requires equipment room monitoring?

Refrigerant leaves the receiver of a system as a _____.