It may or may not be accessible from the controls area, you might need to take the burner off to access it. ... adjust the primary air shutter. Increase primary air by locating the burner inlet and opening the shutter. My question is this and no I dont want to do it, I just want to know what to expect from a service call, are these type of gas log setup adjustable for the air fuel mixture? If adjus tment is needed, carefully adjus t the air adjustment . The direct vent goes straight out back via a 6 inch or so pipe, and has free flow to the outside environment so it lets in a ton of freezing cold air. shutter. When the stove is completely cool, expose the burner piping by lifting the top of the unit. An air to gas mixing valve is provided for fireplaces especially those having sealed combustion chambers as employed in direct vent fireplaces. Measure the CO 2 or O 2 in the flue gas at the trace of smoke level. I just converted a Kenmore 790.71313707 range from gas to lp. The novel mixing valve comprises a channel shaped shutter which mounts on and is linearly slidable over a window or windows made a part of the gas mixing pipe which connects to the fireplace burner. Dirt build up around the air intake, dirty burners or operation at high altitude 2000 ft ++ can cause sooting. Pretty typical. Closed off too much you get a taller orange slow flame. In most tube burners you simply loosen the screw holding the shutter in place, turn the shutter to the desired position, and retighten the screw. For information on adjusting the air shutter see page 27 of this manual. I don't know if you're talking about the shutter on the outside of the vent that vents the exhaust from the house or if there is an adjustment on the gas lines itself underneath the fireplace gas pipes. Adjust the air setting until a trace of smoke is obtained. The valve works with a setscrew that regulates the amount of air flowing with the natural gas used to operate the Heat-n-Glo fireplace. Gas fireplace air shutter adjustment, to ensure the main burner flame is a good rule of gas at this is linked to clean the air adjustment venturi tubes are factory set when receiving your burner the burner manual. Gas fireplace flame color is typically designed to burn with red flames, not blue flame, for a more natural look. A key to a good-looking flame is correct air flow through the provided air-shutters on Direct Vent gas appliances and fireplaces. Do not leave the air settings here. For liquid propane, the air shutter should be open between 3/16” and 1/4”. In this testing we have found that the fireplace, with its standard orifice, burns correctly with just an air shutter adjustment. If too much air is mixing you get a smaller blue flame. Blue indicates plenty of air while yellow not enough. As you turn the shutter, the air vent hole is enlarged or reduced which, in turn, increases or decreases the air … Instruct everyone in the house how to shut gas off to the appliance and at the gas main shutoff valve. While there may have been no air shutter to adjust on the gas pipe leading to the burner pan under the logs, there may be another way of controlling air intake into the firebox. Instead of burning wood in a fireplace, some homeowners choose to install fireplace logs fueled by natural gas or propane. Wood logs do not burn with a blue flame colour, so a gas fireplace needs yellow or red flames for a realistic look and feel. For assistance or additional ... Get fresh air at once! Acid wash (muriatic acid) is used to remove excess mortar. A yellow flame can be the cause of a bad air to gas ratio. ... Also, check the air shutter, I've seen cases of very low flame which just needed an air shutter adjustment. adjust the primary air shutter. Gas Fireplace Flame Color A gas fireplace flame color is yellow or red flames and is the exception to the rule. If the flame from a gas stove burns blue, increase the supply of air by adjusting the shutter valve on the burner. The air shutter adjustment closed too far turns the flames bright orange with black (sooty!) It might be a fix inlet with no adjustment and will require gas adjustment or changes to the manifold. Then open the air adjustment to add reserve air until the CO 2 is lowered by at least 1.5% (or the O 2 is raised by at least 2%). All oven burners hav e an air adjustment . Additional Adjustments. The glass front to the firebox stops half of the cold air coming in, but cold air seeps in from all other areas surrounding the firebox, mostly on the bottom where the gas line/wires are located. For natural gas the air shutter should be completely closed. The air shutter determines how much air mixes with the gas at the burner orifice. 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