Vintage Air System not too cool????!!!!

If you run your fans continuous, your low side should show 15-20psi .

I agree, 6-12psi low side is too low. 20 sbould be right on. !

I actually went and downloaded some of VA's stuff, and they say SEVERAL times that 6-12 is what they want. Evidently they are doing some trickery to do that. IF they are willing to warantee the system that way, and IF they have some control we obviously are missing the trick on, but I agree, I don't know why they would do it this way.