Posted by jeffcat on December 15, 2013 at 21:57:27 from (75.151.154.114):
In Reply to: Orifice question posted by notjustair on December 15, 2013 at 17:40:15:
OK here we go. LP is 16 to one as where nat gas is about 6 or 8 to one. That is gas to air mix ratio. BIG differance. When ovens and the top burners are shipped from factory the BURNERS are adjusted for LP. They are wide open. Nat. gas should be open about 1/4 of the way. This gives you the correct fuel air mix. The regulator on the suply line is what first must be changed. Then think about changing the orifices if they were replaced or drilled. One, the regulator you should see a little lable 4.5 - 6 inch per water columb. LP is in the 8 to 10 in water colum. You need to look at that first. The regulator is not that expensive. The little orifices must be measured with number finger drills. These little sets cost $135.00 per set! I have three sets from two different jobs. There is a conversion chart that tells you how to convert the Btu. rating on your ranges builder plate to NAT. or LP and what drill size you should need. Do the burners on top AND the oven orifice TOO. Get you LP supply guy in there and ask a couple of questions as he checks things out. Jeffcat
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