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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> Commissioning a Boiler https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1121526729 Message started by Timmo on Jul 16^th, 2005, 4:12pm

Title: Commissioning a Boiler
Post by Timmo on Jul 16^th, 2005, 4:12pm

Some of you maybe aware that Worcester Bosch are currently offering free commissioning on some of their boliers.
(Greenstar i, system 12/24i and Junior i)

Can someone explain what exactly is involved in commissioning a boiler.

Ta

Title: Re: Commissioning a Boiler
Post by electandheat on Jul 18^th, 2005, 2:33am

Exactly what is involved depends on the boiler and system. It mostly centers aroung checking working and standing gas pressures and water flow rate through the boiler if its a combi and then adjust if required. I have generally found that provided you have sized the pipework correctly adjustment is not usually required. All the details are found in the installers manual that come with the boiler.

Title: Re: Commissioning a Boiler
Post by Timmo on Jul 18^th, 2005, 7:34am

Thanks e&h.

Title: Re: Commissioning a Boiler
Post by CWatters on Jul 18^th, 2005, 1:17pm

I think it's more important is you have UFH. I think you have to limit the max temperature going to the heating circuit and the whole system has to be balanced.

Title: Re: Commissioning a Boiler
Post by Agile on Aug 7^th, 2005, 11:15am

I think that some of you may be misunderstanding what the manufacturer is offering.

The "free commissioning" is not intended to take the place of a professional CORGI registered installer.

Whilst the water side of the boiler can be installed on a DIY basis, the gas and flue must be fitted by someone who is CORGI registered.

One of the most important aspects of commissioning a condensing boiler is to set the maximum heating output power and temperature. If this is not done the overall efficiency of the system is much lower.

Tony Glazier

Title: Re: Commissioning a Boiler
Post by Timmo on Aug 9^th, 2005, 11:06am

So if I understand correctly agile. CORGI needs to connect up the gas and flue, making sure it doesn't leak. Whilst the actual testing and checking internally to ensure the boiler operates at it's optimum is part of the 'free commisioning'? and not. This is how I understood what was meant by 'free commisioning'.

Title: Re: Commissioning a Boiler
Post by PEDANTICVINDICTIVEMAN on Aug 9^th, 2005, 7:14pm

This is why I changed from Worcester boilers to fitting Ideal Isar/Icos boilers, they are not so faffing on commisioning and have a 1 to 1 ratio gas valve so gas pipe sizing isn't mega critical.

Title: Re: Commissioning a Boiler
Post by chrishutt on Aug 9^th, 2005, 11:02pm

PVM, what does "1 to 1 ratio" mean in relation to gas valve? I've never heard of it. ???

Title: Re: Commissioning a Boiler
Post by PEDANTICVINDICTIVEMAN on Aug 10^th, 2005, 7:29am

My understanding of it is it isn't restrictive, so if there is only 16Mb to the valve that is what it lets through if it's required depending on modulation, if this isn't a correct answer maybe someone on here can explain better.

Title: Re: Commissioning a Boiler
Post by chrishutt on Aug 10^th, 2005, 7:59pm

Surely all gas valves must cause some pressure drop, what with all the changes of direction, filters, etc.

Of course I can see that the pressure drop will vary according to the relation between the actual flow rate and the flow rate the valve is designed for. Perhaps in the case of Ideal boilers the gas valve has a bigger capacity than required.