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Post by rocketmanbkk on Jan 23, 2021 15:08:26 GMT
Hello
A heat only boiler with unvented, approx 8 rads. Sealed system.
Losing pressure slightly each day, not much but going down.
I’ve checked for leaks & weeps, had floors up, everything is dry, no leaking.
Any thoughts please?
System is about 10 months old. WB boiler.
Cheers all
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Post by tomplum on Jan 23, 2021 16:36:59 GMT
have tiy checked the prv rockey, is it going in a tundish ? It might be passing and no ones noticed,  |
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Post by battle1066 on Jan 23, 2021 16:37:04 GMT
What I would do if it's just a small pressure drop daily and you've check all the obvious item for visible discharge PRV - condensate pipe dripping - internally for leak sweats etc
Set the system gauge to an exact mark - close the flow and returns at the boiler why this will prove if it's internally within the boiler or on the external radiator circuit.
If there's no pressure drop its not the boiler it's the radiator circuit and vice a versa!
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Post by rocketmanbkk on Jan 23, 2021 16:42:26 GMT
What I would do if it's just a small pressure drop daily and you've check all the obvious item for visible discharge PRV - condensate pipe dripping - internally for leak sweats etc Set the system gauge to an exact mark - close the flow and returns at the boiler why this will prove if it's internally within the boiler or on the external radiator circuit. If there's no pressure drop its not the boiler it's the radiator circuit and vice a versa! Ok. I’ll pop back on Monday & do that. At least that way I’ll know where to look again. Cheers |
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Post by rocketmanbkk on Jan 23, 2021 16:43:11 GMT
have tiy checked the prv rockey, is it going in a tundish ? It might be passing and no ones noticed, Nothing there Tom. All is dry. |
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Post by battle1066 on Jan 23, 2021 16:49:28 GMT
If it's been loosing pressure and the customer has been topping it up (it could of been over pressurised accidentlly) and unseated the PRV as they give hassle if activated!
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Post by battle1066 on Jan 23, 2021 16:54:39 GMT
What I would do if it's just a small pressure drop daily and you've check all the obvious item for visible discharge PRV - condensate pipe dripping - internally for leak sweats etc Set the system gauge to an exact mark - close the flow and returns at the boiler why this will prove if it's internally within the boiler or on the external radiator circuit. If there's no pressure drop its not the boiler it's the radiator circuit and vice a versa! Ok. I’ll pop back on Monday & do that. At least that way I’ll know where to look again. Cheers I've got my own gauge on a flexi hose which is much more accurate and considerably physically bigger than the integral gauge it, allows easier monitoring for such a problem! |
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Post by rocketmanbkk on Jan 23, 2021 17:14:46 GMT
Ok. I’ll pop back on Monday & do that. At least that way I’ll know where to look again. Cheers I've got my own gauge on a flexi hose which is much more accurate and considerably physically bigger than the integral gauge it, allows easier monitoring for such a problem! I was just going off of the guauge on the vessell. |
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Post by battle1066 on Jan 23, 2021 17:18:39 GMT
I've got my own gauge on a flexi hose which is much more accurate and considerably physically bigger than the integral gauge it, allows easier monitoring for such a problem! I was just going off of the guauge on the vessell. That works but the smaller the gauge the harder to see a small movement so then I leave it over night. |
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Post by DIYDafty on Jan 23, 2021 18:14:52 GMT
Reading this makes me think I'll never get unvented. I've never liked them anyway coz I'd have to have one of Dick's mates ripping me off once a year and still the thing might explode.  If you've got space (and not sure about structural issues on normal suspended floor) are thermal stores any good (with a normal boiler) |
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Post by endfeed on Jan 23, 2021 19:28:17 GMT
Feel around the backs of rad valves,I've had it before tricking down the back of the pipe unseen down to crawl space,
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Post by tomplum on Jan 23, 2021 21:39:40 GMT
Dafty there used to be a poster over at shitfix with your mind set, he was called ' water systems' and he advised everyone to get a thermal store and, he had a famous video of a pressurized cylinder taking off to the moon, In realty the video he posted was of some guys, by passing all the safety devices, then giving it extra heat with the hot water no where to go and they did make it explode but it was't easy,
The thermal store was a 1980's failure, like the betamax video format, they both died because, they were shite, Every plumber will tell you of the sludge build up in the heat stores caused more problems than they are worth,
over to Dick,,,
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Post by dickpuller on Jan 23, 2021 23:45:34 GMT
Micro leaks can evaporate on hot CH systems & a couple can show up a small system pressure loss.
Are they topping it up when the system is cold?
What size is the expansion vessel?
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Post by rocketmanbkk on Jan 24, 2021 14:51:26 GMT
Feel around the backs of rad valves,I've had it before tricking down the back of the pipe unseen down to crawl space, Dry as a bone I’ve even left blue roll around & dry. |
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Post by rocketmanbkk on Jan 24, 2021 14:52:49 GMT
Micro leaks can evaporate on hot CH systems & a couple can show up a small system pressure loss. Are they topping it up when the system is cold? What size is the expansion vessel? They’re not topping it up The expansion vessell is 28l I think Decent size |
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