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Direct vent fireplace. Dancing flame.
Looks like too much yellow in the flame. That is normally caused by the mixing control on the gas feed tube being too closed. Trace the tube from the burner .....back toward the gas feed line....until you find the slip ring that controls the amount of oxygen that is mixed with the gas. Open is a small amount and light it. You should see a bit more blue color. If that does not work, continue to vary the adjustment until the flame burns correctly. The pilot should never blow out unless the outside air feed is too large. You can try blocking it a small amount to see if the smaller amount of outside air corrects the problem.
Posted on May 17, 2014
Any gas appliance has some kind of air adjustment in order to allow oxygen to mix with gas so the gas burns properly. When the air shutters are too far closed we will typically get very poor flames from a mixture too rich with gas or in a high-BTU appliance we'll get very high, yellow, sooty flames. A gas mixture that has too much air will often sound like wind and the base of the flames will seem to float off the burner from the air blowing through the burner. The air flow will often blow the flames out so they will be small blue flames that float up and then flicker out before reigniting and doing it again.
Adjust the air-flow. NG will usually need very little oxygen because NG has some oxygen already mixed-in. LP needs a good oxygen source because LP is all vaporized gas with no oxygen other than what the air-adjustment permits.
This problem is essentially a carburetor issue but an air-to-gas-mixture problem can also be created by clogged orifices, incorrectly regulated gas lines, not opening the shut-off or key valve completely, etc.
If you are not able to get the manual to show you where the air adjustment should be adjusted you will need a technician to follow the gas pressure through the pipe, into the valve and into the burner in order to discover where the mixture is being improperly adjusted. In many gas fireplaces the adjustment is at the tip of the burner or is one of the gas adaptors between the gas pipe in the wall and the appliance. These air-shutter adaptors will have small holes drilled around the nut.
Posted on Nov 26, 2014
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Posted on Jan 02, 2017
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