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A routine maintenance task which must be performed on refrigerant recycling machines is to change filter and compressor oil if any.
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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?
When a unit is opened for servicing, the ________ should always be replaced.
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.