For reasons I might discuss in another thread I have to remove the hot water tank (calorifier) from our Farr1220. On the tank there are 4 inlets/outlets as follows:
Potable Water (the water to be heated):
- Fresh (cold) water in
- Fresh (hot) water out
Engine Water (the water doing the heating):
- Engine water in
- Engine water out
The first two are easy when it comes to disconnecting. For the first the freshwater tanks will be shut off before disconnecting for the second I’ll lose some water into the bilge that is sitting in the pipes between the tank and the hot water taps but that should not be much.
For the second two, I’m a little more cautious. The water from the engine comes from the fresh water cooling circuit on our VP2003T. See attached photo for the two connections on the engine that lead down to the hot water tank.
I do not want to disconnect the pipes on the tank and end up draining all the coolant out of the engine (the hot water tank is lower than the engine header tank). Should I be disconnecting at the engine end first? Note the two outlets on the engine are also slightly lower than the level in the coolant header tank. Once disconnected and caps put on the inlet/outlet on the engine will the engine still be ok to run?
Also, I need to think about the reinstall later and making sure there are no air lock issues.