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When pressurizing a system with nitrogen you should;

Which process applies to cleaning refrigerant for immediate reuse by oil separation and single or multiple passes through devices ,like replaceable core filter driers, which reduce moisture and acidity?

When a technician works for a company in which the technician does not have a financial interest, the technician does not have to be certified.

What is the difference between an azeotropic mixture and a near-azeotropic mixture?

Hydrochlorofluorocarbons (HCFC) refrigerants contain:

Ozone is produced mainly by a process called ____________________.

The DOT-approved cylinder in which refrigerant may be recovered has a mechanism for shutting the recovery system off when it reaches approximately ____________________% full.

Production of CFC refrigerants became illegal on January 1, ____________________.

The trapping of the Earth’s heat in the atmosphere which is causing global warming is called the ____________________.

Mechanical refrigerant recovery equipment must meet specifications established by the 1993 AHRI 740 standard.