On Alianna the domestic hot water heater coil and the engines heat exchanger are connected in parallel off the engines hot coolant line. The domestic water heater coil is about 1/4 inch I.D. While the heat exchanger line is about 1/2 inch I.D. If this is the case most of the hot coolant from the engine may choose the path of least resistance, that is, thru the larger diameter hose and into the heat exchanger. Even if there are no air pockets in the water heater line you could install a valve in the engine heat exchanger line which you can partially close to force more hot coolant to flow through the domestic water heater coil.
On Thu, May 16, 2019 at 11:41 PM Robert Boyer via CnC-List < cnc-list@cnc-list.com> wrote: > It is quite possible (and it has happened to mine after changing the water > heater) to have a pocket of air on the glycol side that prevents > circulation of the glycol. To solve this, remove one end of the hose and > fill it with the glycol/water solution and then re-attach the hose. At > this point it shoul re-establish flow. > > Bob > > Bob Boyer > s/v Rainy Days > C&C Landfall 38 (Hull # 230) > (Presently in Baltimore for the summer) > blog: dainyrays.blogspot.com > email: dainyr...@icloud.com > > > On May 16, 2019, at 9:51 PM, Len Mitchell via CnC-List < > cnc-list@cnc-list.com> wrote: > > > > Bruce, the engine loop inside the water heater is usually copper with no > check valves so it should not matter how it’s connected, it’s just a loop. > You can tell which hose is the supply with the engine running, it’s going > to be the warmest one. The little bit of air inside the loop will be > removed by the engine in its normal cycle and coolant will be drawn back in > from your coolant reservoir. The air inside the tank will come out the hot > side of a faucet. I avoid bleeding air using the pressure temperature > relief valve because they are notorious for dripping after you do, probably > less of a risk at boat pressure compared to household pressure. If it does > it’s usually made by Watts and they aren’t too expensive or hard to replace > with a small pipe wrench. You haven’t said why you suspect air but if it’s > been disconnected a while the engine inlet or outlet can become plugged and > not circulate. Best way to tell is if you have warm water circulating > through both hoses with the engine running. > > Len Mitchell > > Crazy Legs > > 1989 37+ > > Midland On. > > > > Sent from my iPad > > _______________________________________________ > > > > 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 > > -- Sent from Gmail Mobile
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