The various loops of pex tubing all return to a central location where they are then fed into a manifold. The manifold is an impressive cast brass unit that mounts on the wall. What happens after the manifold is something I'll be able to report on once I get there. For now, it all just hangs out.
After hooking up the pex loops in sequence, I then attached a small valve and pressure dial. This allows me to pressurize the tubing system to check for leaks before the concrete is poured when the pex will no longer be accessible. The fitting on the valve receives a bike pump air connection, so, in honor of all things bicycle I decided it was only fitting to pump up the system by bike pump. Roughly 480 strokes later (whew!) the system was up to the required 60 psi. Seeing as it was dark and late and it all looked good, I went to bed and made a note to come back and check it in the morning.
Lo and behold this morning I checked it and it was down to maybe 5 pounds of pressure. Darn. Knowing that the most likely candidate was a leaky connection on the manifold, so I got some soapy water and daubed the various connections and sure enough found a leak. I recconected that fitting and the system has held steady at 60 psi since this morning. I must admit, I used an air compressor to fill the system the second time around.
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