The rusty lever in the top left is the P&T relief valve. With water aligned pull the lever. When solid water flows, you're done.
Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Thu, May 16, 2019, 5:29 PM Bruce Whitmore via CnC-List < cnc-list@cnc-list.com> wrote: > Hello all, > > I think I probably have some air trapped in my hot water heater. I have > found some pretty cryptic instructions for the heater, but: > > a). They do not include a good drawing or explanation of how the hoses, > either fresh water or coolant should be connected (yes I have looked for > better online instructions to no avail) > b). They say "Bleed air from the entire coolant system for proper > operation of both engine and water heater", but don't give instructions as > to the best way to do it. > c). They do not include a listing of the what the stamped letters next to > the outlets mean. (the upper left in the photo is "H", bottom left is "D", > upper right is "P1" and lower right is "C" > > Here's a photo of the water heater: Attwood EHM6-SM Water Heater.j > <https://www.dropbox.com/s/zknhmh77qlh7ks6/Attwood%20EHM6-SM%20Water%20Heater.jpg?dl=0> > > The tube in the upper left feeds the boat with hot water. I think the > tube on the bottom with the valve on it comes from the engine hot water > feed. I turned off the valve, and the hot water continued to run, so it is > definitely not the fresh water supply line to the heater. And, having a > valve on the hot coolant input line would make sense. Therefore, am I > correct in thinking the pipe on the lower right would be the return coolant > line to the engine? > > Now for conundrum #2. > > Here's a photo of the hoses leading out of the engine. Hot water heater > hoses at engine.jpg. > <https://www.dropbox.com/s/24pbeb82hakwxvd/Hot%20water%20heater%20hoses%20at%20engine.jpg?dl=0> > Those hoses connect to the grey solid pipes shown in the previous picture, > somewhere under the floorboards where I can't see which is which. They > were disconnected, but filled with coolant when I got the boat, so I was > just guessing when I connected the hoses to the engine. In looking at the > Yanmar manual, it appears the red hose should be the suction side coming > from the water heater, and the black hose would be the pressure (hot) water > coming from the engine to the water heater. Am I correct? > > Any way about it, since the water going down to the heater must flow down > under the floorboards, up to the heater, then out of the heater and back > down under the floorboards, the water heater would be a prime spot for air > to get trapped. > > So, I am thinking I should ease off the connection coming off the lower > right side of the heater and apply pressure to the appropriate hose coming > off the engine, and see if I get any air out. Then, I want to ensure I am > connecting the correct hose to the right inlet/outlet point on the engine. > Does this make sense? > > Thanks for your insights! > > Bruce Whitmore > > (847) 404-5092 (mobile) > bwhitm...@sbcglobal.net > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
