Worcester 18/25 Heat slave

[Dannypipe]

Called to commission a WB - 18/25 Heatslave.

Customer was out, so I called Worcester to get the figures.

I set up the air, and pump pressure, and couldn't get the CO2 anywhere close. Was aiming for 12.5 and could at best get to 10.

So called Worcester again, who told me to play with the air settings to try and get it right. Which I did, and could improve it and got up to 10, but no higher.

Going to call them again on Monday.

Anyone any thoughts?

BTW - I didn't check the nozzle was what it says it should be. I had already taken burner off to check end of nozzle as this boiler has been on uncommisioned for two months. (I was only called in as it is apparently locking out sporadically)

Settings were all wrong, but checked

 

[Dotty]

12.5? Bit high for my liking! What pump pressure you got?

 

[Dannypipe]

150 psi.

 

[Dotty]

That's over 10 bar! Bugger me! Knock it back to 8 bar or 130 psi. Then try adjusting the air.

 

[kimbo]

Mid range setting with .55 nozle is 145psi co2 12. Air setting about 6. Try settings with air snorkel removed just in case they have buggered the flue seals. I woul do vo2 at 11 to 11.5

 

[Dannypipe]

I just set the PSI to what WB told me. I did say to the lad working for me "christ that's 10bar".

I've left it at 150 psi, and air at 8 as they said they wanted it for the nozzle I quoted. I can't remember now what nozzle it was.

I wish I had removed the snorkel now.

I don't do enough oil work to be as experienced as you fellas, so I just did what I was told. At those settings, CO2 was about 8.5/9.

It's possible they have buggered the seals, as it was the customers dad who fitted the boiler,though I am told he is a retired plumber.

Do you think I should call Worcester to go look at it on warranty for the fella?

 

[Dannypipe]

That's over 10 bar! Bugger me! Knock it back to 8 bar or 130 psi. Then try adjusting the air.

You think I'd see more change if the pressure was down mate?

 

[kimbo]

Most oil boilers are set at mid range so if that is correct in this case you should have a .55 nozzle. The settings they have quoted are for the next size up. If you increase the air you decresse the co2 so if the air is 8 for co2 of 9 if you adjusted air down to about 6 you should see the co2 increase. Do this with air snorkel disconnected first. If the sesls have been bugheted and its essily done that would account for the earlier lockouts.

 

[Dotty]

I do, yeah. Take the snorkel off first as kimbo said.

And do a smoke test before you stick your analyser in.

 

[Dannypipe]

Cheers fellas.

I smoke tested it first.

My analyser is playing up. Dodgy connection on the probe. It's due in for calibration anyway, but can't be without it until next week.

So I was in the freezing rain, and the CO2 was just not shifting. Then kept going blank cos' of the dodgy connection, I put the air all the way up to 9 (doh) and saw pretty much no change. (I should have been turning air down).

So set it back to 8.

It's just come to me, it was a 0.65 nozzle.

Anyway, thanks a lot chaps.

 

[lame plumber]

Greenstar Danesmoor WM 18/25 literature - Worcester, Bosch Group UK installer site

have a peek at page 33 me thinks your muddling nozzle sizes versus settings as mentioned unless you have a stirling burner which for a .65/80 eh is 150 psi and air setting of 8 giving co2 of 12.5 but for a riello with a ,65/60 eh is 120 psi air setting of 3 giving co2 of 12, so burner model dependant!

 

[Dannypipe]

I didn't have the manual to hand! Customer had locked it inside. So I quoted WB the nozzle and they gave me the settings.

I think you are right though.

It was definetly a Riello burner. That much I am sure about. I think I'll be popping back tomorrow to set the boiler up again.

Oh dear. Thanks again everyone.

 

[Killy Bing]

Where is the job dan

 

[lame plumber]

thought you youngsters all had mobiles and ipads to look things up when manuals go missing

 

[Dannypipe]

Didn't have the manual on my laptop. Plus it was dark and pi$$ing with rain!

Job is near you Billy! Only charged £100.00

Also noticed, no fire valve, and soak away put in right next to the building. So will send an advisory on that. You think I shouldn't register it until he's put that straight?

 

[Dannypipe]

thought you youngsters all had mobiles and ipads to look things up when manuals go missing

PS - I'm 35!!

 

[lame plumber]

Like I said and if no fire valve, I wouldnt sign it off for commissioning paperwork as its not iaw mfis or building regs

 

[Dannypipe]

BTW - Billy pricing up a Monster job. If and it's a big if, I get it. I will def' want you on board mate.

 

[Killy Bing]

BTW - Billy pricing up a Monster job. If and it's a big if, I get it. I will def' want you on board mate.

I like to hear this, remember I'm no where near speedy and fit the apprentice role more than a full blown engineers still.

want me to pop along tomorrow?
Can use my analyser as yours is playing silly buggers and two heads can be better than one!

We were changing over oil tanks today for ali, steel bunded one! Lovely piece of kit.
i did not appreciate the 30 metre last minute trench i had to dig!

only 100!! I'll have to put my prices up!

 

[EPH]

Monster job? Tell us more............

 

[SimonG]

I wouldnt be setting a wb at 12.5 co2. Heading for problems. Id want to see it a tad under 11.5.

 

[Dannypipe]

LOL - I've PM'd you about the job mate. As for the boiler, I will have to call the bloke tomorrow to make sure he's home.

£100 sounds expensive, but I was there two hours, and had my lad with me, who's cost me £10 an hour. So with fuel, and registration fees, not a great earner. No idea how two hours went past, but they did. Probably dicking around trying to call WB twice, and checking the baffles, oh and waiting 20 mins for the customer!

 

[Dannypipe]

Monster job? Tell us more............

House nearly 1000 square meters. New build. Full system, inc solar. UFH on ground floor, rad's on first/second. All zoned. Plus bathrooms. For me, that's a nice (monster) job.

 

[EPH]

In case you need it

 

[Dannypipe]

Think I need this app. I didn't have internet connection though!