Air migrating from header tank

[dgadee]

I find that the liquid level in my header tank rises because the level in the heat exchanger drops. Is this because, perhaps, when I installed a calorifier that I attached the header tank to the out rather than in (or vice versa) tubing from the engine? If I swapped them about, do you think it would make any difference?

 

[pvb]

I find that the liquid level in my header tank rises because the level in the heat exchanger drops.

I don't understand this sentence.

 

[boguing]

Can you sketch the arrangement? There are a number of ways of doing it wrong, but getting in/outs of calorifier isn't one. That just reduces efficiency.

 

[VicS]

Hopefully your header tank is the highest point in the system but it seems that air is becoming trapped in your calorifier.

You may need a vent pipe from the calorifier to the header tank so that air can escape from it if it cannot do so via the outlet.

As suggested a diagram, showing the relative heights and the positioning of the hoses would give us a better understanding of your layout.

 

[dgadee]

View attachment 34223

Perhaps the installataion is a bit simpler than my grammar.

 

[boguing]

OK. Here's a guess.

The high pressure pipe from the engine is the lower line in your drawing. It finds it easier to pump to the header tank (less pipe friction).

Change that so that the high pressure pipe goes to the calorifier, and for efficiency, to the bottom if the heating coil is vertical (no difference if it's horizontal).