Staple balls
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| posted on 19/11/12 at 10:21 PM |
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Boiler conundrums.
Right, another of those nothing to do with cars at all, threads.  (maybe soon I'll get to ask car related stuff)
We currently have oil fired heating with an eurocal boiler, but it's being a bit of a pain, and I have no idea why.
For a start, with the central heating off, one radiator (In an upstairs bedroom) is always on, I'm pretty sure this was common many, many years
ago, but this is only a 6-7 year old system.
Secondly, when the heating is on timer, the downstairs radiators don't heat up on the timer (but the upstairs ones do) however, the downstairs
radiators get pleasantly hot at about 4am.
Oh yeah, and the radiator manual says the water pressure should be ~1 bar, however it sits at about 2.5-3 bar, even if you release the pressure, it
returns to its normal state within a few hours.
All radiators have been bled, and get hot, just not when I want them to.
Any ideas?
Cheers.
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RickRick
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| posted on 20/11/12 at 06:53 AM |
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is the valve on your fill loop leaking so it's constantly being filled slowly?
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cliftyhanger
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| posted on 20/11/12 at 07:07 AM |
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Agreed. The PRV is probably constantly bleeding excess pressure once at 3bar.
And I am assuming this is a pressurised system with a tank?
The bathroom rads used (still are?) plumbed into the cylinder circuit to dry towels etc. Was the bedroom once a bathroom?
As to rads and times, sounds like the system has been incorrectly installed with a mistake somewhere, but where? That is where my ideas run out
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r1_pete
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| posted on 20/11/12 at 07:50 AM |
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If the upstairs rads get hot, and the downstairs ones don't it sounds like the pump is not running, the upstairs will heat due to thermo
syphonic action.
It may be that the pump is switched by the room thermostat, and at 4.00 am when the room is at its coldest the stat trips and the pump starts up. It
could also be a diverter valve that is operating in this way, shutting off the downstairs rads, but my guess would be its the pump.
Is your timer set so the heating should be on at 4.00 am?
Do you have any other heating on in the room with the stat? reason for asking is this could heat the room and trip the stat so the heating thinks it
does not need to be on.
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Staple balls
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| posted on 20/11/12 at 08:11 AM |
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There's no thermostats in any rooms.
The timer is set so the heating would come on at 7am and 8pm, but the heating is actually turned off on the boiler as due to whatever is up with it
means the house is warm enough anyway.
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mcerd1
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| posted on 20/11/12 at 08:58 AM |
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quote:
Originally posted by cliftyhanger
The bathroom rads used (still are?) plumbed into the cylinder circuit to dry towels etc. Was the bedroom once a bathroom?
getting a new gas combi at the moment and the batroom one is getting left on with no thermostat - its needed by most boilers so that they can contnue
to circulate water even once all the rooms are hot (if it couldn't you might damage the boiler) - at least thats what I've been told
[Edited on 20/11/2012 by mcerd1]
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Staple balls
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| posted on 21/11/12 at 08:42 PM |
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Cheers chaps, looks like the tap to fill the system was ever so slightly open, not sure why that'd cause such high pressure, but nonetheless,
it seems to have fixed it.
Woke up to a lovely cold house this morning, so got the heating on now.
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JoelP
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| posted on 22/11/12 at 04:35 PM |
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with the fill loop open, the boiler and rads would be pressurised to mains pressure, until the boiler decides to vent the excess pressure, limiting it
to about 3bar.
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