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Originally Posted by jlrii
Not a big problem...all compressor casings are steel and the discharge lines also are somtimes steel. The only time you see the steel rust is when it is exposed to water as in outdoor conditions.....even if rust is present on the exterior you never see any corosion inside.
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Corrosion is a big problem but only for improperly charged systems. And, it isn't galvanic corrosion, it's straight rust and acid etching. If water vapour gets in, it can cause chemical reactions that create bad things such as hydrofloric acid (not that water in and of itself isn't bad for steel and the motor wiring in the compressor). That's the paranoid answer.
The real answer is, "No". Use a vacuum pump to get all the water out, use clean refrigerant, and it should be just fine. If you start using things like ammonia (for an adsorption system, for example), things can be more exciting. But, if you are doing things like that, I'd assume that you know to use stainless steel tubing for corrosion resistance and high pressure strength.