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Carrier 48GS package unit Carbon Monoxide issue!

17K views 51 replies 11 participants last post by  albrantley  
#1 ·
I installed a new heat exchanger, inducer draft motor assembly, & the back plate for the draft motor today and after getting it done I started it up and everything came on fine. The 2 shot burners where burning blue and the outlet pressure was running around 3.2 to 3.3. However, after I was gone for about 2 hours the H/O called and said that there CO monitor was going off. When I got there I started it up and the gas valve didn't want to open up but after several attempts it finally did. The flames look great but i am getting a strong smell like a rich mixture but there is no adjustments that i can see on the burners for the air. i am getting an elevated reading in the house but i took the right side panel back off to check everything and it looks sealed up with no way of sucking the exhaust back into the system. I am stumped and can't think clearly at this point. I have never had this type of issue before after installing one before. The only thing I know of right now that doesn't seem right is the rich smell I am getting out of the flue and that is it!!!. Can someone help. Could a faulty gas valve cause this to happen?
 
Discussion starter · #41 ·
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!
 
Discussion starter · #39 ·
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.
 
Discussion starter · #35 ·
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.
 
Discussion starter · #28 ·
I tried getting the size today @ Carrier so I could match it up with what was on there but the counter guy couldn't find it so I just left it alone for the time.
 
Discussion starter · #23 ·
sorry about the slow responses, I just had my first child two weeks ago and I have been trying to spend some time with him!! It is natural gas. That is a good idea on the draft motor. I will check that!
 
Discussion starter · #22 ·
i noticed that both part #'s have a 500 in it but the part #'s i have for two of the parts have 400 in them. Such as the inducer fan assembly is a 48gs400649 and the flue box collar is a 48gs400108. I do not know if this means anything?
 
Discussion starter · #13 ·
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.
 
Discussion starter · #12 ·
Just got home after going back out this call again. I replaced the gas valve due to an intermittent problem of not openning up when 24v was applied to the valve. After that, I just started it up after cheching the burners and the orfices which were fine but to no avail. So, I removed the heat exchanger again and took everything off of it and made sure everything was sealed and caulked to make sure no leaks then reinsalled and fired it back up but STILL the exact same problem. I am soo confused now because I not sure what to do. I did look over the heat exchanger while I had it out but didn't see anything abnormal.
 
Discussion starter · #3 ·
Thank you for your response. The only other thing in the house that is on gas is the water heater and at this time it is not working itself. They have had it shut down for a while. Now on the regulator ,if I check the inlet and it is around 10 or 11 then I do not need a regulator right? To be honest, around here I have hardly ever seen an external reg on any unit for that matter at least when it comes to residential systems. The flame retainer is something I think this unit doesn't have on it and from the pictorial that came with the new heat exchanger it doesn't show it either. What was wrong with your unit (48td009) that was producing the CO, was it a cracked one? The alignment I might need to check on! It seems that when I install the gas nipple it doesn't align perfectly up with the hole and it causes it to shift a little but not very much though.
 
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