Lineset size reduction, is this an acceptable practice?

[ferrythecat]

I was installing a 5 ton York R22 system last week, and it had a 1 1/8” suction line, something I hadn’t expected to see (haven’t seen many 5 tons though).

So off to the supply shop, who suggests that to save $ I drop to 7/8”. I didn’t take him up on his offer, but later when connecting up at the coil, it
had a 7/8” fitting.

I double checked the spec sheet and these are a properly sized and matched set, but the compressor has a 1 1/8” fitting and the coil a 7/8”. Even more
interesting, the compressor itself is a 7/8” fitting, but the service valve takes it from 7/8” compressor in to 1 1/8” line set out.

So my question is, would it be an acceptable practice to use only a 7/8” line set?

Is a 1 1/8 to 7/8 fitting at the coil the norm on a 5 ton unit?

I can only assume that the large diameter tubing holds more Freon and as such probably adds to system efficiency. Any other thoughts on this?

Thanks
-CK

[watercop]

No offense meant, but this seems a pretty basic question, and I'm confused by it being posted in the situation you describe. I don't understand the relationship you ascribe between more freon and increased efficiency.

If you are qualified / trained / licensed and properly equipped to install split equipment you should be aware of what circumstances call for upsizing lineset diameters. The circumstances aren't unique to 5 ton equipment; the numbers change but the concepts are the same.

If you are qualified I suggest you register as a pro and transfer the thread there. Site rules prohibit specific assistance of this type in the residential forum. Pros far more qualified than I will get you squared away quickly in that section.