part numbers?

[cyberdyne]

Hi all
I have an Ariston Genus 27 Plus combi boiler.
I have had a heating engineer around to day who fitted a new PRV (part no. 569292) but the problem remains - aleak - and have been told that I need to find the two remaining PRV's to have them replaced.
Does anyone know how I can get these part numbers please as the old PRV's are in situ and very difficult to look over.
I don't intend installing them myself, nor would I attempt any repairs. The engineer today was fully qualified and I intend to use the the same for the next replacement jobs.
Any help appreciated.

 

[voiceofthemysteron]

Hi all
I have an Ariston Genus 27 Plus combi boiler.
I have had a heating engineer around to day who fitted a new PRV (part no. 569292) but the problem remains - aleak - and have been told that I need to find the two remaining PRV's to have them replaced.
Does anyone know how I can get these part numbers please as the old PRV's are in situ and very difficult to look over.
I don't intend installing them myself, nor would I attempt any repairs. The engineer today was fully qualified and I intend to use the the same for the next replacement jobs.
Any help appreciated.

Yer Tiz
http://www.mjtcontrols.co.uk/Part_Type3.aspx?Manufacture_ID=10&Part_Type=PRV

 

[chrishutt]

Shouldn't your "engineer" have worked out which PRV was leaking before replacing? There's no point in replacing parts that aren't faulty. Perhaps looking for a competent boiler repairer would be a better course of action - he should have the unvented ticket to work on the hot water store side of it (does yours have this?).

Chances are there's no fault with the valves at all, they're just doing their job and releasing excess pressure. A competent unvented specialist will check the expansion vessels. One or both will have failed. It's cheaper to replace them with generic external vessels, if you've got the space.

 

[cyberdyne]

Shouldn't your "engineer" have worked out which PRV was leaking before replacing? There's no point in replacing parts that aren't faulty. Perhaps looking for a competent boiler repairer would be a better course of action - he should have the unvented ticket to work on the hot water store side of it (does yours have this?).

Chances are there's no fault with the valves at all, they're just doing their job and releasing excess pressure. A competent unvented specialist will check the expansion vessels. One or both will have failed. It's cheaper to replace them with generic external vessels, if you've got the space.

Thanks for your comments Chrishutt, but firstly, he was there to replace a part we ourselves had sourced, ordered and had delivered, due to a previous 'engineer' (is there a better name?) letting us down. He then recommended we have the other two replaced at our convenience, which we've decided to do immediately. To save having to wait four or five days for the parts to arrive, we have decided to again, source, order and have delivered by courier, the parts ourselves.

voiceofthemysteron, that seems to be ideal, thanks. Although, we are under the impression there are 3 x PRV's on this boiler; 1 x hot water, 1 x cold water, 1 x part no. 569292(which we had replaced today). The site only lists two, one of which is indeed 7 bar - the same as one if the existing PRV's.
Do you know why there might only be two listed as opposed to three?
Thanks again.

 

[cyberdyne]

Think I may have answered my own question:

Descripition Quantity Price Item Total Remove
573140 : PRV: T + P Valve 7 Bar £30.25 £30.25
573139 : PRV: Expansion Relief Valve 6 Bar £7.89 £7.89
569292 : SAFETY VALVE: Safety Valve 3 Bar £6.55 £6.55

The third vavle, which was replaced today (apparently unnecessarily) is called a Safety valve as opposed to a PRV.

 

[chrishutt]

So why unnecessarily replace the other more expensive ones?

 

[cyberdyne]

So why unnecessarily replace the other more expensive ones?

Why do you suggest the replacement is unnecessary?
The 'engineer' has advised us that there is a leak from one of them, but was unsure which, so recommended we change both.

There is definitely a leak as there is a patch of water below the bend of the outlet pipe. The slow drip of water is visible on the outside of the pipe.

 

[cyberdyne]

Chances are there's no fault with the valves at all, they're just doing their job and releasing excess pressure. A competent unvented specialist will check the expansion vessels. One or both will have failed. It's cheaper to replace them with generic external vessels, if you've got the space.

Also, with the greatest of respect, I'm not finding your responses particularly helpful I'm afraid. If I knew enough to understand the majority of what you've written, I wouldn't necessarily need to be asking for help on this forum.

Sorry, but whilst I appreciate your time, could you explain in less technical terms.
Thank you.

 

[chrishutt]

I'm trying to point out that your "engineer" probably doesn't understand unvented hot water storage systems or sealed systems and the role of expansion vessels.

You are wasting your money buying the valves identified. If water is being released by either PRV it is probably due to a failed expansion vessel.

I am suggesting you find someone more worthy of the term engineer, someone who can explain the function of expansion vessels and how their failure might lead to release of water from PRVs.

 

[cyberdyne]

I'm trying to point out that your "engineer" probably doesn't understand unvented hot water storage systems or sealed systems and the role of expansion vessels.

You are wasting your money buying the valves identified. If water is being released by either PRV it is probably due to a failed expansion vessel.

I am suggesting you find someone more worthy of the term engineer, someone who can explain the function of expansion vessels and how their failure might lead to release of water from PRVs.

Then I will get a second opinion on the suggested valve replacement.
Thank you.

 

[chrishutt]

Get an opinion from someone with the unvented ticket. The 60 litre unvented cylinder in your boiler is a potential bomb if not fitted with the right safety devices.