Moisture debris can be trapped within the system
Moisture and debris
Vacuuming the system after it all has been is closed is essential to the overall performance of it,when moisture builds up it can cause real havoc to the tech,and really cause a mistrust between you and the customer
Water can freeze,and stop up up metering devices such expansion valves,orifice tubes and will eventually damage parts or may even cause an explosion.
Acid can be build through out the whole system when moisture becomes excessive it takes time it must be done otherwise you will eventually have to replace a compressor and other components.
There two types of moisture
Don,t confuse the two you may have a leaking drain line that can be described as moisture