Dxgshpwh (ground source heat pump water heater)

stevehull · 06-09-15, 06:33 AM

Memphis,

Now a few things are making sense. I bet that tiny flakes of oxide are partially plugging the cap tube. No big deal - just braze with an inert gas.

The funny thing with small particles in the system, is that the set up will not work predictably. Sometimes all is fine and then a bit of oxide flake gets in there. Because of the tiny tube diameter a smaller flake can restrict flow. It only takes an 11% change in tube diameter to decrease flow by 50%.

PLEASE do not get discouraged. This is great stuff!

Steve

06-09-15, 06:33 AM	#11
stevehull Steve Hull Join Date: Dec 2012 Location: hilly, tree covered Arcadia, OK USA Posts: 826 Thanks: 241 Thanked 165 Times in 123 Posts	Memphis, Now a few things are making sense. I bet that tiny flakes of oxide are partially plugging the cap tube. No big deal - just braze with an inert gas. The funny thing with small particles in the system, is that the set up will not work predictably. Sometimes all is fine and then a bit of oxide flake gets in there. Because of the tiny tube diameter a smaller flake can restrict flow. It only takes an 11% change in tube diameter to decrease flow by 50%. PLEASE do not get discouraged. This is great stuff! Steve __________________ consulting on geothermal heating/cooling & rational energy use since 1990