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TOPIC: Upside down expansion tank in heating system ?

Upside down expansion tank in heating system ? 10 Sep 2017 11:53 #94960

Simon,

My expansion tank is also "upside down" with schrader valve at bottom. Tank hangs on an arm with an Automatic Bleed Valve above it, so bleeds of any air accumulating in system.



Colin Stone
KEI
www.luxe-motor-kei.co.uk
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Upside down expansion tank in heating system ? 10 Sep 2017 11:52 #94959

  • Simon Hewitt
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........... although loosining the connection while filling should work - thanks !

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Upside down expansion tank in heating system ? 10 Sep 2017 11:44 #94958

  • Simon Hewitt
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Thanks - a bleed screw would be the best way, but a bit tricky to install (would need to tap a thread etc). I think just loosening the connection would still leave some air in the top of the U bend.

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Upside down expansion tank in heating system ? 10 Sep 2017 11:36 #94957

  • Derek and Janice Wallace
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The easiest permanent solution would be a bleed screw on the top of the inverted U.
The other possibility is cracking open the fitting going into the accumulator until water comes out then nip it up. There is every chance that's still full as there is no apparent drain. What you'd get is a small slash of water as the pipe empties., then air, then water.

Derek

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Upside down expansion tank in heating system ? 10 Sep 2017 11:18 #94956

  • Simon Hewitt
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I have had to drain all the radiators in my heating system ( which is driven by a Webasto water heater). There is an expansion tank T-eed in to the system with the connecting water pipe in the shape of an inverted U going up and over in to the top of the tank, with the Schrader valve at the bottom of the tank (which feels like it is upside down to me !).

So, when I refill the system, how will water get up the pipe, over the bend and down into the tank given the fact that when it was drained down there must now be air in the pipe at least up to the top of the U bend ?

Is there any special procedure for filling the system when it is configured like this ? Should I let all of the pressure out of the Schrader valve first ? Do I have to disconnect the pipe from the top of the tank and fill it manually before filling the whole system ?

I have had real problems with the Webasto overheating in the past, and I know that it is really important to get all of the air out of the system to prevent air locks which can inhibit the water circulation, so I am a bit paranoid about this.

Sorry if i have not explained this very well !

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