You cap everything but one convenient place. Then make yourself a
test gauge. Make up a fitting which will allow you to tie onto a hose
from your air compressor, a ball valve, a tee with a air gauge on one
side and transition to copper on the other. You should be able to get
all of this at a hardware store. Solder it into your system. Close
the valve, and hook up the air. Crack the valve until the gauge reads
twice the working pressure of the system, then close the valve. 60
psi is probably OK.. There is a certain number that they will allow--
I don't remember the numbers--so many pounds in so many minutes, but
when I have done it for myself, I've been able to get them to hold
turn main valve off, adapt garden hose fitting to compressor to check
cold, and do the same for hot at a wash tub.
you may have trouble finding leaks when using air.
water lets you know where the leak is
The problem with using water is that if you have a leak, you have to
drain all of the water back out to repair the fitting. Then refill
again to test. Most leaks when testing with air are pretty obvious.
Use your ears to find them. I would suggest air testing first, and
if you have a leak that you can't locate, use water.
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