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PostPosted: Tue Aug 15, 2017 10:12 pm 
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Having got a friend's Icos HE15 back to life, I noticed that the by-pass pipe (with gate valve) in their airing cupboard got hot very quickly as I tested the boiler on DHW setting - it basically seemed to heat up just as fast as the flow to the 3-porter.

The by-pass pipe went hot far quicker than the feed to the cylinder coil.

The gate valve felt very loose to turn, so I wonder if it was moved accidentally - lots of towels etc pressed up against it?

I didn't note how open/closed it was, tho', but I'll be visiting again tomorrow so can check.

How do you set this in practice? Does anyone actually fit a pressure gauge or flow meter?! Or is it by 'feel' :wink:

Is there a crude setting I could try? I know it shouldn't be fully off at any cost. Would one full turn open from fully closed be a good start?

Thanks for any advice :-P .


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PostPosted: Wed Aug 16, 2017 8:17 am 
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I usually start with them set at 3.5 (on a Honeywell) and work from there.

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PostPosted: Wed Aug 16, 2017 11:19 am 
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gas4you wrote:
I usually start with them set at 3.5 (on a Honeywell) and work from there.

The OP has a manual (gate valve) bypass; not an ABV.

If the system has a mid-position valve (Y Plan) a bypass is not necessary as there is always an open path.


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PostPosted: Wed Aug 16, 2017 11:37 am 
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Missed the bit about the gate valve, in that case shut it completely and then open 1/2 to 1 turn.

If a Y plan has all the rads fitted with TRV's, like a lot of the older systems before a 'boiler interlock/room thermostat' was mandatory and the hot water is off, then you will still need a bypass.

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PostPosted: Wed Aug 16, 2017 8:27 pm 
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If DHs assumption is correct & it's a 'mid-poss' valve, and not a divertor valve, then yes the valve will have an open port when at rest. But hey, without photos we're all in the dark!!

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PostPosted: Sun Aug 20, 2017 11:34 pm 
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Sorry for the late reply, and thanks for your posts.

Yes, it's a 'Y' plan.

The 22mm gate was 1 1/2 turns open from fully closed, and I tweaked it down a half-turn (before I read your posts - or else I'd have tweaked it a bit more :-)

I guess it's required for the CH side, as all rads - afaIk - have TRVs, so if they were all to shut down the circulation would have no path?

No issue on DHW side, of course.

When I visit again, I might tweak it down to just a half-turn open.

Many thanks, gents.


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