The sale of CFC and HCFC refrigerants has been restricted to certified technicians since _________ :

When servicing an open refrigeration system, filter drier shall be always replaced:

A sensor and alarm are required for A1 (R-12, R-22) refrigerant as defined by ASHRAE is to sense ________:

Which of the following are the indications for a high pressure system has a leak:

When evacuating a system, it is required that the vacuum pump pull a minimum of ________:

The state of the refrigerant leaving the liquid receiver of a refrigeration system is a _________:

Moisture indicating sight glass is located downstream of the which of the following:

If refrigerant seen at liquid-line sight glass contains bubbles then , the charge is probably __________:

Hermetic compressor can be operated when the system is under a deep vacuum.

The amount of refrigerant that is absorbed in the oil is affected by which of the following:

All recovery cylinders are ______ rated

Typical AC compressors are limited to about _______ tons of cooling capacity

The liquid receiver is NOT part of the low side of the system

If you can warm the system, the recovery process will go _________

Recovery units remove the refrigerant in which of the following phase: