I am having a very odd issue with our pressure water
system. The problem is that we have water
pressure at the hot water tank, but no cold water making it's way to the faucets. Here is the rundown....
Installed a Jabso water pump, one of those new fangled units that don't need an accumulator tank, and can vary pump speed as demand changes. Worked fine for months. Then, I replaced the hot water tank. It is a Webasto wall mount unit, that heats from AC or engine
. Once this was installed, the pump would not shut off on it's own, and the how water was making it's way out of the tank and back down to the cold water line to the faucets. We only had hot water.
The solution was to install a check valve in the line supplying the hot water tank, so that the hot water could not come back out of the tank down the supply line and feed the sink faucet. This worked, but, now we cannot get any cold water out of either faucet.
If the pressure in the hot tank is low enough to call for pressure, and the cold water faucet is open, we will get cold water until the hot water tanks
is charged, and then no more.
Here is how it is plumbed. Output of pump goes to a T connector. One end of that goes to the hot water thank (with the check valve installed) and the other end goes forward through the bulkhead, to another t connector. One end of this goes to each sink cold side on the boat.
I removed the hose from the pump discharge end, and was able to blow water out of the open cold faucet.
So, is this a problem with the pressure switch on the pump, an internal pump issue, or ??? I am stumped.