Question

question # 18 when dehydrating a system, it should be evacuated to a minimum level of; a 30 inches of mercury b 25,000 microns c 500 microns d epa does not have a requirement

Explanation:

In refrigeration and air - conditioning systems, when dehydrating a system, it is common practice to evacuate it to a minimum level of 500 microns of vacuum pressure to ensure proper removal of moisture and non - condensable gases. 30 inches of mercury is a high vacuum level but not the typical minimum for dehydration. 25,000 microns is too high a value for proper dehydration. And the EPA does have requirements regarding proper system evacuation for refrigerant systems.

Answer:

C. 500 Microns