this HX has flare connections on the ac side, i bought two braze -> flare adapters. Because the connections sizes on the HX are bigger then the lines from the as unit now i can easily solder a smaller pipe inside this adapter and i know i will have a proper connection on the HX.
this is an 1/2 inch flare connection with a 3/8 pipe I made the end of the pipe a little wider with the flare tool so now i can easily solder it together.
For the sizing of the HX i looked how much power the compressor had an by that data i bought the HX. Probably not really the right way.
@ NiHaoMike
In the outside unit there is an fixed expansion valve it is a pice of think copper packed in isolation foam.
everybody thank you for the help i really appreciate it !
stef