question for Mark Hunt

ed wallace

looked at a gas boiler today laid my CO detector over opening in jacket on start up meter went up to 30 ppm of CO then dropped down to 0 ppm in less then 30 seconds i know this is not right and suggested a cleaning should i be looking at any thing else like gas valve out of adjustment

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Mark Hunt

Sounds like


it took a bit to establish draft and was spilling.

Where exactly did you pick up the CO reading?

Mark H

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ed wallace

question

its a peerless boiler there are air vents in the jaket top above the burners

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Mark Hunt

Hmmmmmm


They have integral draft hoods right?

I think it did not establish draft immediately and flue gases spilled into the home.

Any sign of flame roll-out? Scorch marks above the burner tray? Is there a roll-out switch?

Mark H

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brandon_2

carpet pad for radiant staple up

carpet salesmen staes that we should be using felt pad for beneath the carpet . will this allow the heat to penetrate the pad to the carpet

ed wallace

question

no roll out swtch the units probably 15-20 yrs old no safeties at all except hi limit switch

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Unknown

I am not Mark Hunt

but it is not unusual for gas equipment to spill products of combustion into the space until a draft is established. It is also typical for there to be higher levels of CO on startup than once the system has heated up and good combustion is taking place. Equipment that has the draft hood built into the unit have an even harder time as they do not have "rise" to create some self venting action. If the unit stopped spilling after a couple of minutes and the level in the ambient air went to zero it should be okay.

Did you do a combustion test on the equipment? If so what did you get for readings?

It is obvious you need some training on recognizing possible combustion problems. If you feel the gas valve is a problem then take an inlet and outlet gas pressure. The outlet pressure should match the rating plate setting. Did you clock the burner to see if the input is correct?

A boiler making CO does not always need cleaning as you can have CO and not be sooting up. Was there any sign of carbon deposits anywhere on the unit? Did you inspect the sections? Put a glove on and reach inside the unit and see if you get any soot.

The only way a gas valve would be a problem is if it was passing after shut down and sooting up the inside of the burners.

ed wallace

question

yes Timmie i need more training no havent done anything but a quick inspection that will be done on Thursday alot of dust due to constuction unit has a flue pipe on top of boiler and after a few minutes draft is established

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Glenn Harrison_2

Ed, when you go back

pop the top on that boiler and make sure the hood is in ggod shape i.e. no holes or cracks, and make sure the gasket between the hood and the sections is still sealing. You can do this with your CO meter while the boiler is running, just run it along the edge of the hood and see if you detect any CO. Considering the age, it's possible the gasket is dried up.

Mark Hunt

Ed


Think about what is happening when a burner ignites. A sudden heating and expansion of air. It is not uncommon for a portion of those by-products to be spilled out of the flue system simply because the flue system is not capable of handling the sudden load.

As long as draft IS established within an acceptable amount of time, no problem. That is natural (read, natural draft).

The fact that you even noticed this is a testament to your professionalism sir. You are head and shoulders above most "professionals". You truly are a professional.

Keep testing Ed, it is the only way you know for sure.

Mark H



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Unknown

Ed, how much construction?

If it is really stirring up a lot of dust and dirt it could be causing a problem.

Unknown

Peerless boilers

from my files some info on combustion tests.This is on 6 different boilers tested starting in 1976 up to 1989. I have not worked on a Peerless since then as far as testing.

CO2 7.8% to 8.5%

O2 7.1% to 6.5%

Net Stack 500 to 550

Draft -.02 to -.03 after the draft hood.

Air free CO 75 PPM to 95 PPM

These are final readings on different Peerless boilers after extensive cleaning and repairs.

Mark Hunt

I think


he witnessed a delayed draft situation. CO wasn't off the charts and disappeard pretty quick.

Isn't great that he was testing?!?!?!?

What a guy!!!!!!!!!!

It was good to see you again Timmie.

Mark H

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