I am currently installing a Daikin VRV iii. I have limited space between BS box and refnets. other than the refnet being flat as we all know from the "water" video. Is there any other "must do`s". There is a rumor in my company that after the refnet there must be 500mm before any bends in the pipe. I have looked everywhere to find if this is true, cant find anything that says it is.