air/gas ratio

[andyg0507]

eveninng all as the title sugests if you have a boiler that needs setting up on gas valve how is this acheived, just installed a veeissman 200w and cannnot for the life of me work out how to set the min andd max ratings, getting silly readings like 9000ppm, its a real head scrathcher, checked flue for tightness, getting 20.9% o2 so no leaks.

newly registerd aswell so nothing like being chucked in at the deep end:28:

needless to say the boiler has been turned off correctly until this is sorted.

 

[diamondgas]

Read page 135 of this http://www.viessmann.co.uk/etc/medi....51309.File.File.tmp/Service 19 to 35 kW.pdf .... never seen one but is the technology a bit OTT on this boiler? By looks of it you can do nothing as the boiler does it all itself via ionisation signals? It does mention that you could get higher than normal readings as it self adjusts!! lol

 

[mfgs]

9000ppm, thats alot of co.

 

[andyg0507]

diamond gas, my thoughts exactly, i certainly wont be fitting anymore, theres a whole wad of info to go through before you can get the boiler working, long call to tech tommorrow i think:censored:

 

[diamondgas]

good luck any info you get may be worth posting here for future refrence. I'd certainly be interested in what you find out...

 

[AWheating]

if you have the correct inlet pressure and the flue is ok then surley its a fault and manufactures need to be called? if it was benched at the factory at 20mb inlet and you have that it could have delevolped a problem in transit?

 

[SimonJohns]

All commercial boilers that I have done have required you to calibrate the high fire setting and low fire and on certain boilers a couple of interim settings. This is done on the gas valve as it would be a zero governor gas valve.

I haven't any experience with this boiler bit I would assume you would have to do this

Do you have alot of experience with install or calibration of large commercial appliances?


By the sounds of it too me your massively overgassing the boiler which could suggest you have a blocked air intake or gas valve is way out


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[SimonJohns]

if you have the correct inlet pressure and the flue is ok then surley its a fault and manufactures need to be called? if it was benched at the factory at 20mb inlet and you have that it could have delevolped a problem in transit?

This doesnt happen on comercial

They deliberately put the valves out to make sure u get great combustion


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[AWheating]

This doesnt happen on comercial

They deliberately put the valves out to make sure u get great combustion


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good to know,never done comercial . I know they do this boiler in domestic and comercial guises so there would probably be a difference in set up. I would expect the domestic versions to be benched and ready to go on 20mb inlet pressure? i know in the past some boilers having problems with baffles etc.... dislodging during transit mind you i think it was on an ideal boiler.

 

[Ryster]

Ive been on the Weissmann installers course at Telford.
I wouldnt install one after being on that and seeing the amount of crap you have to go through to get it working!

 

[Dannypipe]

Well if anything, at least I've learned from this that commisioning a Weissman is a job best avoided. Don't think I'll be fitting one any time soon. Cheers fellas.

 

[andyg0507]

update on this thread, the boilers gas valve was faulty, and has now been changed by there engineers, i certainly wont be fitting anymore of these boilers either.