Which of the following refrigerant has a molecular formula is C2H4F2:

After reaching the required recovery vacuum on an system, if the system pressure _____, indicating that there is either refrigerant in liquid form, refrigerant trapped in the oil, or a leak in the system.

R- 134a is a corrosive refrigerant:

With the rising cost of refrigerant, the value of the refrigerant stored in a 50-lb. recovery tank is worth _______ the cost of a recovery tank

Used cylinders can be recycled with other scrap metal

Refrigeration cylinders must be re-tested at ______ intervals

Refrigerants may be mixed in recovery cylinders:

On _______, the U.S. EPA enacted the provisions of this agreement into regulations for the United States

Persons servicing MVACs do not have this choice they must be certified as _______ MVAC technicians if they perform the AC service for compensation.

The AHRI standard now contains the new specification to limit unsaturated impurities in HFC-134a to a maximum level of ________

One chlorine or bromine radical liberated has the capability to act as catalyst and breakdown _____ number of ozone molecules in stratosphere:

Ozone in the Earth’s stratosphere is created by UV light striking _____ molecule