Which of the following is true regarding refrigerant leaks on small appliances?

If a large leak of refrigerant occurs such as from a filled cylinder in an enclosed area, what action should be taken when no self contained breathing apparatus is available?

After the refrigerant has been recovered, which of the following can be used to flush the system?

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 filling a charging cylinder with a regulated refrigerant;

If, after installing a fitting for the purpose of recovering the appliance’s refrigerant, you find that the system pressure is 0 psig;

If a system will not hold a vacuum after it has been evacuated, then:

On what does a Type II EPA certification allow a service technician to work?

When pressurizing a system with nitrogen you should;

Cooling occurs in a direct- expansion vapor compression refrigeration system when: