Forum Discussion
Farmboy666
Oct 05, 2017Explorer
Travelin2 wrote:Farmboy666 wrote:loggenrock wrote:
Low point drains do NOT drain the fresh water tank - that's another valve. Low point drains allow water in the lines to drain - you should have both a hot and a cold drain, in addition to the water tank drain. 3 total. I have a 2015 Prism 24J - the valves are small T-handles that pull up to open. Lousy placement, they are behind a panel in the under-bed storage compartment. They will drain onto the ground. Mine happen to be just behind the passenger side rear dual wheels. ST
My low point drain DOES drain my fresh water tank and everything below it so be careful with your blanket statements.
I agree with loggenrock. The valves called "low point drain" refers to the valves that open the pressure lines and allow the water retained there-in to drain by gravity. If indeed those valves also drain your freshwater holding tank then when you close those low point drain valves the pressure in the lines when the system is pressurized would backfill your freshwater tank. Your freshwater tank has an overflow/vent line so when your low point valves are closed there must be water constantly flowing out your vent line. Right?
My rig has two low point drain valves and one freshwater drain valve.
Here's why that doesn't happen. The low point drain valve is the only way to drain my fresh water tank. I don't have an open fill valve to pour water into for filling the tank. I have to connect to the city water fill connection and open a valve on the line going into the fresh water tank to fill it. This is the same valve that I would close if connected to city water at a campsite to stop the tank from filling and over flowing. This valve is then opened to let water out of the tank into the lines to either run off the pump or to empty through the low point drain. It's not a great setup but my tank is the highest point in the system and has to be filled with pressure from city water. I am thinking about adding another pump so I can fill from a portable water tank but with a 55 gal tank I haven't needed to yet. Hope that explains it.
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