So when you leave a boat for a long period you winterize all, and turn the heat off. But you can also make a black box (it is a grey one actually) to control the heating, and the 3 way valve. And allow the heat to turn on when you are on your way to the boat.
We have a great Kabola Combi heating unit, using the radiators and heat exchanger to keep us warm and cozy and to also allow us to take long hot showers. We ‘inherited’ an electric hot water boiler which is also generating hot water when the engine is running. Great more cooling capacity!!
So we need to combine all in one unit, and I came up with the following solution/logic. Use the 2nd relay in the Venus to turn the heating on just before we arrive, and a 24V solid state relay to control the 220V to the Kabola.
Select if you want to use the Kabola or Engine heat?
If on engine heat, do we want to use electric to provide hot water ( for emergency use)?
If the remote on is not active, over ride it.
So you can see to top switch up is Kabola and the green light labelled Kabola brightens the day 3 way valve on Kabola and down is engine, and it lits the yellow light and turns the 3 way hot water valve to the Vetus boiler
|So you can see to top switch up is Kabola and the green light labelled Kabola brightens the day and the 3 way valve is on Kabola.|
Top switch down is engine heat/ cooling, and it lits the yellow light and turns the 3 way hot water valve to the Vetus boiler
Under the green safety is the switch to override the remote. The remote is a function of using the VRM app of Victron, allowing to turn a relay On/Off remotely.
I could ultimately also include a switch to turn the electric on for the Vetus IF the switch is on engine
Here we see the box again with a 3rd bottom light showing that the remote is on
The 3 way valve is 220 V. Blue -> neutral, Green ( pos1 ) to mains, Brown ( pos2 ) to mains
This valve is controlled by the double pole 2 way switch, selecting Kabola or Engine.