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Originally Posted by helsonbm

Everything is basically new. New heat exchanger, inducer assembly, back plate, gas valve, and the 2 inshot burners. I called Carrier and there is no regulator or flame retainer for this piece of equipment. They doubled checked too. The alignment of the burner is right on as well. Sealed with high temp caulk, didn't go crazy with it but there is plenty to make a good seal. Not sure what else to check. The outlet pressure is a least 3.5 to 3.7. That model was a 48GS-030060301 by the way.

I had this problem. Cleaned the soot from the burner and seems to be working. I plan to go back and pull the inducer and look at it.
Alvin

Ran a call the other day identical to this thread. Odor was strong with CO levels around 15ppm. Heat exchanger was ok and draft motor rotating the right way. No economizer package to allow extra infiltration. Long story short gas valve inlet 7.9 outlet 6.0. Natural gas. Replace valve all good. The previous response to my question sunk in much more after this call

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Originally Posted by craig1

Package units are not perfectly sealed, if theres a 10000 PPM cloud of CO surrounding the unit, some of its going to get sucked in through the seams, such as the filter door.

Makes total sense.

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Originally Posted by hvac wiz 79

Glad you found and resolved the issue. I still want to know how the CO levels rose in the building

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Package units are not perfectly sealed, if theres a 10000 PPM cloud of CO surrounding the unit, some of its going to get sucked in through the seams, such as the filter door.

Your welcome. I hope you find it useful. That app prevented me from being 2 hours away with the wrong parts.

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Originally Posted by hvac wiz 79

On the talk of carrier. Anyone have the parts app? It's been good so far. One of the carrier distributors around here has a very lackadaisical counter guy. When I'm forced to go through him I have found to sometimes double check because he has screwed up. For instance quoting me a 3ph cond motor when I knew for a fact the one in question was 1ph. Anyway, its the CE app

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Thanks!

Originally Posted by flanders

Where did u find that app? I couldn't find it online.

http://www.carrierenterprise.com/
On the bottom right of the page.


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Originally Posted by hvac wiz 79

On the talk of carrier. Anyone have the parts app? It's been good so far. One of the carrier distributors around here has a very lackadaisical counter guy. When I'm forced to go through him I have found to sometimes double check because he has screwed up. For instance quoting me a 3ph cond motor when I knew for a fact the one in question was 1ph. Anyway, its the CE app

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Where did u find that app? I couldn't find it online.

So, your inducer was spinning backwards?

Me too! I was thinking about that myself!

Glad you found and resolved the issue. I still want to know how the CO levels rose in the building

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That was the problem!!! The inducer draft motor was wired wrong. I had the brown where the purple should be! Changed these two wires and it fixed it!

I would go back over that HX install again with a fine tooth comb.

I know the burners have a particular way they lay on each other that might be another thing to check, along with alignment in the opening.

Gravity might have already sent it too you, but I'll email you a pdf of how they go together.

thank you for your info. I will do some more research. I will tell you this, if I stick my fluke CO monitor at the flue exhaust it will peg out at a thousand ppm. It will burn your eyes.

you always have good info.

thanks

If you think the CO is coming from this unit, it really needs to have a combustion analysis done, because it is producing way too much CO.


Here is an explanation by Jim Davis about how much CO the unit has to produce, to get any CO inside the structure.


A 100,000 btu furnace uses 25 cfm of air for complete combustion. Furnace blower in heating move 1300 cfm on draft induced and 1500 cfm on condensing.

If you mixed 100% of the flue gasses with 1500 cfm how much CO would you have to be making to get a reading of 10ppm?

25cfm is .016% of the mixture, therefore the furnace would have to be making over 600ppm which exceeds the 400ppm "air free" they are allowed.

The furnace would have to be red-tagged without a hole or crack.

That is dumping 100% of the flue gasses into the airstream. A crack may under certain conditions may leak say 2% of the 25 cfm or say .5 cfm. .5 cfm is .003% of 1500ppm.

So to read 10ppm of CO in the airstream, the furnace would have to be making over 3000ppm of CO.

Even without the blower running the volume of air in the plenum versus the volume of air from a leak would be still be quite diluted.


Bottom line: To get measureable CO in a space an appliance,or vehicle, has to be making seriously high levels of CO, or it has to have been made over long periods of run time.

how would the furnace flue gases get into the home?

you are allowed by ANSI standards to have 400ppm CO airfree or "CO(0)" in the exhaust. I was trained CO under 100ppm undiluted, which I've been able to achieve on every appliance.

so if your under 100ppm CO in the flue then your good. Now you need to figure out how its getting into the home.

opened windows? blower door has a gap? heat exchanger not sealed around air gaps? have car started in garage? they cleaned the electric over and didn't ventilate the home?

there CO was going off audibly at 125ppm and and mine would get up there around 60 and 70 then I would stop monitoring at that point. Nothing else is running to produce the gas.

Yes, that got burned off already.

so we've gone to all this about the furnace, have we tested to see if the furnace is actually producing over 100ppm CO?

Maybe he got CO from car running in the garage?