Domestic water not being heated

[RogerDis]

Since our Barrus 2000 overheated because of a split pipe between the skin tank and the calorifier, the water heated by the engine isn't getting to the calorifier. The whole system was flushed through and refilled when the split pipe was replaced. The guy who did that job has been back to see if the problem is an air-lock. He did shift a small amount of air from the system, but believes now that there is no more. The header tank remains full when the engine is run. The skin tank likewise.

Can anyone here think of anything that we might have missed, please?

[Tony Brooks]

Don't they have a separate calorifier thermostat? If so the overheat may have caused it to vent wax so now it is not opening.

[ditchcrawler]

Or there is still an air lock in the calorifer coil, is it higher then the engine, is there ant warmth going along the pipes to it. You may have to crack a union to bleed it, I put a vent on mine. 

[Boat&Bikes]

Is your calorfier horizontal? Are the hoses to and from it getting hot? 

Ian.

[Boat&Bikes]

2 hours ago, Tony Brooks said:

Don't they have a separate calorifier thermostat? If so the overheat may have caused it to vent wax so now it is not opening.

Our Shire does. OP may not as he said hose between calorifier and the skin tank, dual thermostat engines run separate hoses between engine and cal and engine and skin tank, don't they?

Ian.

[RogerDis]

Thanks very much for all of the help, gentlemen! I'm forwarding your thoughts to the guys who started the job!

Roger

 

[Tony Brooks]

14 hours ago, ianali said:

Our Shire does. OP may not as he said hose between calorifier and the skin tank, dual thermostat engines run separate hoses between engine and cal and engine and skin tank, don't they?

Ian.

Unless its a return hose that will not help hot water circulate. I'd much rather the main feed to the calorifier came from the engine side of the thermostat, typically from a tapping in the head. If both hoses do run from the skin tank or skin tank hose there is little to circulate the water through the calorifier.

[Flyboy]

18 hours ago, RogerDis said:

Since our Barrus 2000 overheated because of a split pipe between the skin tank and the calorifier, the water heated by the engine isn't getting to the calorifier. The whole system was flushed through and refilled when the split pipe was replaced. The guy who did that job has been back to see if the problem is an air-lock. He did shift a small amount of air from the system, but believes now that there is no more. The header tank remains full when the engine is run. The skin tank likewise.

Can anyone here think of anything that we might have missed, please?

Barrus Shires have 2 stop valves on the engine on the flow & return to the calorifier. Check that these are both open as they may have been shut when your pipe repair was done.

[dccruiser]

like ditchcrawler i put a vent pipe on mine under the engine hole with a bolt and jubilee clip to block it when not in use ... used to be a nightmare to bleed before then.

Rick

[RogerDis]

I'm so sorry! I didn't know that there had been any replies to this - I got no notification. Thanks for the advice. The problem has been solved, but I'll remember what you've suggested should it happen again. The guy I paid to solve the problem had a hell of a job! I don't think he knew your solution!