R410a Oil Return

Does Anybody Know The Velocity And Miscibility Rates For R410a?
I Have Been Told The Velocity For 410 Negates The Use Of Oil Traps For Oil Return By One Manufacturer. A different manufacturer said that Even If There Is Only 1 Metre Differential Between Indoor (lower) And The Condensing Unit ,traps Must Be Fitted, Which one is right??????
Hope Someone Can Shed Some Light On This Subject.

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Originally Posted by paddy

A different manufacturer said that Even If There Is Only 1 Metre Differential Between Indoor (lower) And The Condensing Unit ,traps Must Be Fitted, Which one is right??????

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Interesting mind! Look at splits on R410A. Have you ever seen a traps on theese ones? The differential between units may be about 30 m (90 feets).

Have a look at Mcquay's web page they do a good piping guide with all the info you need.