Only getting blue how can the air supply be adjusted for a more realistic flame in vent free fireplace

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.

This will depend on whether the fireplace is vented or is vent-free. Vent-free gas fireplaces are sold as a kit with the valve, burner, media (logs, glass, shapes, etc) all designed for a particular placement to work together to reduce dangerous chemicals. A vent-free burner and valve cannot have the logs removed and replaced with some other type of ceramic gas log because the exact placement of the logs is designed around the ports in the burner where the flames rise to minimize carbon created from the flames touching the logs.



If your fireplace is vented then the pull of the flue will remove dangerous fumes created by the same placement so there are no rules about re-arranging or replacing "media". If the fireplace is vented then you could use other log-placement-guides to identify the type of log and where it belongs with little worry because vented logs are designed to be able to have some adjustment anyway.



If vent-free and without a manual, an educated technician should do this for you because the BTU setting on the valve must be compared to the types of burners, port placement, size of ports, amount of ports and flame height. After this examination, someone familiar with the various hidden "tongue-and-groove" etchings in different types of gas logs can figure-out where to place the logs. They may have to test the fireplace burning once or twice to get it exactly correct but once you understand the idea of how a vent-free gas log diminishes the carbon-output of the amount of gas flowing through the burners then it is only a matter of watching the flames to see where the logs could be and comparing the size and layout of the logs to find the best fit.

Generally, whether it's a Vent-free or Vented fireplace, lower than normal flame height is caused by 3 things: Low Gas pressure; The air shutter control valve is clogged or needs adjusting; The burners need cleaning.

I haven't seen a unit in the past 10 years, that has a flame height adjustment, other the flame height control knob, that's part of the control assembly. Have you checked that, to see what height it's turned to low?

Perhaps, if I knew who the manufacturer was and the model number, I could be of more help to you.

Here's a few things to look for. After you light the pilot and turn on the burner, look at the pilot flame. Is it still a strong blue flame and it is still heating the thermocouple? If the pilot flame is a lazy yellow, it may not be able to keep a good enough flame on the thermocouple to keep it hot. The solution? Turn it all off and let it cool down. Take a can of compressed air, like you use to clean computer keyboards, and using the attached straw, blow out the dust or spider web that's partially blocking your pilot orifice. Where the pilot flame is usually lit, blow right down that flange, as well as through the air hole that is on the side of the pilot assembly. If you do it right, the pilot flame should be a nice and strong blue color. Another thought. Is this a vented or unvented fireplace? If it's vented, make sure it has the oxygen it needs to burn by checking for blocked vents or opening a closed fireplace fume above it.
Douglas

Hi do you the make and model

is pilot flame on the thermopile good, pilot flame should cover the thermocouple and thermopile if unit has both

you must keep the burner and the pilot light area clean and free of dust also,the area where your burner gets air most of the time it has an adjustment to give it more or less air.I have had my dyna glo vent free model for 8 years.A good cleaning in late fall with low pressure air and 1 or 2 times through the winter depending on conditions of use.
gatesmason88

your line mite be stopt up get a mach and turn on you gas and see if i lights up if it dont your eather out of gas or your gas holes whare the flame cums out is stopt up

its an air shutter issue