It is an inaccurate statement to say that molecular sieve will never release moisture. Every filter-drier core goes through an activation process prior to completion of the manufacturing process. This process has the cores placed in an oven at an elevated temperature to drive out the moisture the sieve adsorbed during its time exposed to the atmosphere.
Also, when the filter-drier sees a temperature increase in a working system, its water capacity will be reduced. So, if the filter-drier had adsorbed enough water at 70F such that it was near its rated water capacity, a temperature increase would cause the excess moisture above the filter-drier's new (and lower) water capacity to be released back into the system.
Likewise, when the filter-drier experiences a temperature drop (during the night, for example) it will remove some of that water that was previously released back into the system.
do you have a link or supporting study to support your argument?
i understand that you took the sponge example literally and that would be correct it is chemical, however my point was that a filter/dryer has its limitations...
sorry bunny you are correct! i found this http://books.google.com/books?id=n5-...page&q&f=false
4 more posts and I might have an opinion.
I'd say a 10 year old filter-drier ought to be removed, and two liquid filter-driers isn't a good idea....extra pressure drop.
Mfgs don't make it convenient to change their factory installed filter-driers, given their location upstream of the liquid shutoff valve...hence they don't get changed when they should.
As some have stated, always change the filter drier if the system has been opened. Yes, a filter will release moisture with too much heat. This is the reason for cutting out, not sweating out a drier to replace it.
that is a golden rule open system = new filter drier i would call company back and ask them y and see what they say :bump: