Good morning all,
I'm hoping for confirmation that my Yanmar 3jh3e freshwater/coolant pump actually has two parallel loops/sides: 1) an engine coolant side, and 2) a "domestic hot water" side. (I completely understand there is a RAW water loop, with it's own pump, that goes to the heat exchanger mounted on top of the engine--that is not at all what I'm talking about.)
Background: I'd like to do a have been working on deferred maintenance on my 2001 Hunter 380 and am coming to the periotic antifreeze flush (no idea if it's ever-ever been done). The engine has a typical expansion reservoir with red/pink coolant ) going to the radiator cap on top of the engine. However, the "domestic" hot water tank, which heats with the engine, has green glycol with an expansion tank in the aft SB locker, where a Espar heater once lived (I presume that the Espar also once heated the domestic water). The domestic loop has 3/4" hoses in and out of the engine coolant pump (about 10 o'clock if viewing from the front). Other than the obvious raw/seawater exchanger on the port side, I don't see a heat exchanger, anywhere.
Where is the "domestic" hot water tank/green-glycol getting it's heat from? Does the engine's freshwater coolant pump really drive two parallel systems? Thank you all for your patience! j
I'm hoping for confirmation that my Yanmar 3jh3e freshwater/coolant pump actually has two parallel loops/sides: 1) an engine coolant side, and 2) a "domestic hot water" side. (I completely understand there is a RAW water loop, with it's own pump, that goes to the heat exchanger mounted on top of the engine--that is not at all what I'm talking about.)
Background: I'd like to do a have been working on deferred maintenance on my 2001 Hunter 380 and am coming to the periotic antifreeze flush (no idea if it's ever-ever been done). The engine has a typical expansion reservoir with red/pink coolant ) going to the radiator cap on top of the engine. However, the "domestic" hot water tank, which heats with the engine, has green glycol with an expansion tank in the aft SB locker, where a Espar heater once lived (I presume that the Espar also once heated the domestic water). The domestic loop has 3/4" hoses in and out of the engine coolant pump (about 10 o'clock if viewing from the front). Other than the obvious raw/seawater exchanger on the port side, I don't see a heat exchanger, anywhere.
Where is the "domestic" hot water tank/green-glycol getting it's heat from? Does the engine's freshwater coolant pump really drive two parallel systems? Thank you all for your patience! j
