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Old 04-14-2009, 09:45 PM   #1
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Oven co testing


Any one have any average co readings for nat gas ovens. I have one as it cycles at 400 deg. it runs up to 225ppm and then starts to drop and then of shuts down on temp and goes through another cycle. If I run a hotter temp the co readings are lower and the same in the oposite the lower the temp the higher the co. Always under 400ppm durring operation.
The stove is very clean and only 4 mos old. On a full cold start it spikes to 625 and then drops. I have tried to adjust air shudder, leavel of burner and hight of burner shield above burner. This is the best I could get.
Does this sound in line with normal operation?

Thanks in advance
John

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Old 04-15-2009, 04:27 AM   #2
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Oven co testing


Some can't be adjusted to have low CO.

The good units can be adjusted to a peak o less then 100PPM at 350F.

Check your gas pressure.

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Old 04-15-2009, 07:00 AM   #3
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Oven co testing


I have found that around 300-400 ppm of co is about adverage for a gas range.. This is caused mostly from the flame impingment of the burner against the oven burner spreader plate. You can usually adjust the burner orifice & get it to drop a little but, you are cutting the BTU of the oven
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Old 04-15-2009, 10:45 AM   #4
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Oven co testing


There is an air shutter on the main burner. Open it full wide. 400 ppm CO upon startup is acceptacle. However, this reading should drop and stabilize between 30 and 50 ppm during it's run cycle. Upon shutdown, obviously this reading must always decrease.
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Old 04-15-2009, 12:14 PM   #5
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Oven co testing


As it cycles on temp the relight now spikes to 134ppm and then starts to drop. But with nothing in the oven it reaches temp very fast and dosent have time to drop very much. Now if I raise the temp to run longer then the co eventually drops to under 50 ppm but then starts to cycle again at that temp never really dropping much below the 134ppm. I guess this is the best it can do. It is my oven so I have plenty of time to keep playing with it.

been: There is no gas pressure adjustment on the gv. but incomming psig is good

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Old 04-15-2009, 01:06 PM   #6
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Oven co testing


If it's your oven You can check it with air shutter full open. But, this will sometimes cause the flames to start lifting off the burner which isn't good. Yes the 300-somestimes 500 ppm co should be ok at start up. but, should start to drop well below this after warm up
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Old 04-15-2009, 02:27 PM   #7
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Oven co testing


Put a reg on it.

I never learned how much pressure, "presure is good" is.

Non of my manometers have ever had those wors on them.
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Old 04-15-2009, 07:26 PM   #8
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Oven co testing


Unless it's an old range or he has taken it off.. Most come from the factory with a reg. installed
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Old 04-15-2009, 07:29 PM   #9
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Oven co testing


Quote:
Originally Posted by kenmac View Post
Unless it's an old range or he has taken it off.. Most come from the factory with a reg. installed
I can't say I've ever seen one without a reg.

But, I haven't worked on every brand/model oven there is.

I hate working on gas ovens.
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Old 04-15-2009, 07:37 PM   #10
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Oven co testing


residental ranges not bad.. Commerical ,,, I hate.. They call when they are hot & someone is always spilling hot food,grease, etc, on you. Not to mention laying in the greasy floor I also hate fryers !!
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Old 04-15-2009, 07:52 PM   #11
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Oven co testing


Fryers scare me.

Seems someone always wants to put more frozen fries in the one beside the one your working on.
And they don't care if you get burned.
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Old 04-15-2009, 08:53 PM   #12
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Oven co testing


Quote:
Originally Posted by kenmac View Post
If it's your oven You can check it with air shutter full open. But, this will sometimes cause the flames to start lifting off the burner which isn't good. Yes the 300-somestimes 500 ppm co should be ok at start up. but, should start to drop well below this after warm up
I have tried full open it operates at a lower co with slightly closed. The longer it runs the lower it goes but with nothing absorbing the heat it cycles quickly.
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Old 04-15-2009, 08:57 PM   #13
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Originally Posted by beenthere View Post
Put a reg on it.

I never learned how much pressure, "presure is good" is.

Non of my manometers have ever had those wors on them.
Incomming is 6.5". I have never seen a regulator on a resadeintal stove. Although I have onle recently started looking into them. I thought they have a reg built in like a furnace gas valve. Do res. stoves need them?
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Old 04-15-2009, 09:17 PM   #14
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Oven co testing


Some had an adjustment on the valve knob, to restrict gas flow.

Put one on it.

And you will probably be able to get your CO below 100PPM on light up. And less then 50 after the flame stabilizes.

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