What is the canister thing about size of a small soda can on a refrigerant line near the heat pump or air conditioner condenser (outdoor unit)?
Saturday, June 1, 2019
It is called a "filter drier” and does exactly what the name says: it filters out small particles and removes moisture with a desiccant from the pressure line (the smaller tubing with no insulation, also called the liquid line). A filter drier is not usually installed with a brand new system, but typically added to the line after replacement of the condenser or if a refrigerant leak has made recharging the gas necessary. Any small contaminants can damage the compressor, and water in the line will generate organic acids that form a sludge-like goo that will eventually clog the expansion device at the evaporator coil.
Although a filter drier canister on the pressure line can be installed as preventative measure, it is considered an indicator that there has likely been some sort of previous repair to the system. Also, the filter drier itself can cause a problems when it becomes clogged and needs to be replaced.
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