New boiler installed.

[Minty!!]

Had a new Worcester Bosch 38 CDi fitted today. The installer ran the boiler through it's start up process and ran the boiler at a temperature of 90 degrees for nearly an hour. I was a bit shocked at this and was expecting the central heating system to blow up at any moment as we would normally run the system at around 25 degrees.
After running the system at that temperature for that length of time he then turned down the temperature and announced their is a leak somewhere on the system. All pipework is now concealed making the leak difficult and expensive to find. The system was pressure tested to mains pressure for around four days prior to floors going down.
I am left wondering whether this boiler installer was right to run the system at such a high temperature for so long.

 

[ShaunCorbs]

Any pics of the install please ?

 

[snowhead]

90 degrees would be boiler water flow temperature.
Your 25 degees would be room air temperature.

You'd never heat a room to 25 degrees air temperature with a boiler water flow temperature of 25 degrees.

 

[Tjdservices]

When carrying out the benchmark after installing a new boiler you need to do a number of tests, these include gas rating the appliance. For this you have to run the boiler at maximum for a set period of time before taking the readings.

 

[Minty!!]

90 degrees would be boiler water flow temperature.
Your 25 degees would be room air temperature.

You'd never heat a room to 25 degrees air temperature with a boiler water flow temperature of 25 degrees.

Thank you for replying.
So does this mean you would run the system at 90 degrees flow rate for an hour to test the system? Only l have been told a lot of different information ranging from, l've never heard of anyone pushing a boiler that hard on it's initial test, to, it seems a little excessive but the system should handle it. Someone has also told me the boiler should have cut out at 80 degrees for safety reasons. if this is true why would he have left the boiler running at this temperature for so long, could this have caused any damage to the boiler?

 

[Masood]

Thank you for replying.
So does this mean you would run the system at 90 degrees flow rate for an hour to test the system? Only l have been told a lot of different information ranging from, l've never heard of anyone pushing a boiler that hard on it's initial test, to, it seems a little excessive but the system should handle it. Someone has also told me the boiler should have cut out at 80 degrees for safety reasons. if this is true why would he have left the boiler running at this temperature for so long, could this have caused any damage to the boiler?

Boilers do have an overheat safety cut-out but that is normally higher than 80°. How do you know he ran it at 90°, out of interest?
This won't have been the boiler's initial test, by the way - they are tested at the factory. I've never needed to run at full power for quite that long during commissioning however the boiler and system should be able to handle it.

Who installed and tested the pipework that is now concealed?

 

[Minty!!]

Boilers do have an overheat safety cut-out but that is normally higher than 80°. How do you know he ran it at 90°, out of interest?
This won't have been the boiler's initial test, by the way - they are tested at the factory. I've never needed to run at full power for quite that long during commissioning however the boiler and system should be able to handle it.

Who installed and tested the pipework that is now concealed?

I'm glad to hear the boiler should cope with it. I know he ran it so high because l was there and asked him if the digital display figure showing 90 was the temperature and he said yes it is. The pipework is half original and half new, which was installed and tested by a different plummer.

 

[Masood]

The pipework is half original and half new, which was installed and tested by a different plummer.

I thought that might be the case, hence the question. The boiler installer has stress-tested the system because he couldn't be 100% sure of the pipework he was connecting on to. He's found a leak and the responsibility is clear. A few weeks or months down the line and boundaries get blurred in terms of who's liable for problems caused by the leak.

The pressure testing that you previously mentioned - are you sure it was at mains pressure?

 

[tamz]

Cdi's are one of the only boilers i know you can set to run at 90º. Most others will cut of at 82º.

It wouldn't make any difference to the pipes.

 

[AlexGas]

Only l have been told a lot of different information ranging from, l've never heard of anyone pushing a boiler that hard on it's initial test, to, it seems a little excessive but the system should handle it. Someone has also told me the boiler should have cut out at 80 degrees for safety reasons. if this is true...

That is a lot of information to take on board in one day! You've done well! Any photos, please!?