I am trying to figure out the heating
system in a relatively new to me Catalina
Mk2. I have a Webasto auxiliary diesel
heater (TSL-17) , a Seaward
S600 domestic hot water
tank and a 35 hp Universal engine
I was under the impression that hot water
and heat could be generated by the engine coolant
, the auxiliary diesel
heater and of course the electric
heater in the Seaward
I have made some progress in figuring things out but I am still far short of understanding the system and thought that maybe somebody here could give me a pointer or three.
I think I am ok in understanding the Webasto portion of the system. There is a breaker marked 'heater' on the main panel which enables a circulation pump and the Webasto, there is a thermostat which turns on the fans for all the hot water to air heat exchangers throughout the boat and there is a three position switch that has 'engine heat' on one side and 'system heat' on the other side. Mid position is probably 'off'.
Besides needing to understand all systems and how they work, at this point I am baffled by the 'engine heat' portion of the system. I believe that the heating
system works fine but there seems to be no heat diverted to the domestic hot water unit (the Seaward). Since I don't know what I should or should not expect to see, my next step in trying to work things out will be to trace all the hot water lines in the boat.
This brings us to the reason for this post ..... I am wondering how heat is transfered from the engine to the other systems (cabin heaters and domestic hot water heater). Is there an accepted way of doing this or are different methods used? I would expect to have the engine coolant
go through a heat exchanger
to the Webasto hot water loop but so far I have not been able to figure out exactly what is happening.
Part of my difficulty seems to be the fact that the engine produces little heat at idle tied to the dock
. Today for example I ran the engine for 45 minutes trying to find a pesky coolant/antifreeze leak (without luck) .... at the end of the 45 minutes I had some warm air coming from the heater outlets but the domestic hot water was stone cold. I will try to do this test again under real conditions on the water but any hints as to what I should see with this system would be appreciated.
.... so far I haven't even been able to find the heating loop connections for the Seaward. This shouldn't be rocket science but I am really starting to wonder.