I have a 90% propane furnace with 3 burner units. Each has a adjustable screw which allows me to cut down on oxygen. currently wide open Flame going in chamber more yellow than blue. Should I adjust....?
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that's really not a question. do you need to adjust a burner or an electrode? the question that is not a question is not clear. my 6 year old can write with complete sentences.
adjusting a grill burner is usually a process of adjusting the gas flow through the orifice and adjusting the air shutter that allows oxygen to mix with gas as gas flows into the burner. The only other adjustment that affects the burner is not always on every control valve but if it is there, look down inside the valve stem. If there is a tiny flat-head screw there that is an adjustment for gas flowing through the control valve. The orifice, air-shutter, valve stem adjustment is all there is but that is a tremendous amount of control for a simple gas burner that is a solid material with no moving parts.
if the question is adjusting the electrode, an electrode is only a miniature spark plug. the only adjustment is setting the gap. aside from that we can make sure the ground is clean and connected tight, make sure the power source is strong and make sure the tip of the electrode and where ever it will spark is clean. One well-placed drop of grease will foul an electrode so the grease needs to be cleaned from the tip and from aound the tip for a spark to have a clean place to arc against.
Hi, propane gas is really hard on a furnace in causing a burner or burners to carbon up. Yes, there is gas coming from this orifice, what you need to do is grasp the burner from the front, lift the rear out of the slot it sets in as you pull forward, and take the burner out. Turn it over and clean it out. It may be full off rust and some carbon. You can do this, as it may take care of the problem. We have taken on some furnaces, if your home is heating fine on the 3 burners, and remove the orifice and just plug it off. Doesn't hurt anything at all, I believe its a 1/8 or 1/4' pipe plug. I have done this many times when the temperature rise is to high on a new unit, and the only option is to shut down one burner. No harm or adjustments needed. Try cleaning the burner first and make sure the tail end sets back in its slot. If this works, great, if not, plug it off and your set. Will save on your gas bill also. Sincerely, Shastalaker7 A/C, Heating Contractor
This 'adjustable plate' is known as an 'air shutter' located at the tips of the venturri tubes which are the tubes that carry the propane from the valve to the burner. These air shutters allow you to control your flame by mixing oxygen with propane to create a yellow flame to a blue flame. The perfect flame is a uniform blue flame with a small yellow tip.
Unfortunately, these air shutters are considered part of the burner itself and cannot be individually replaced. However, if the burner and venturri tubes are separate from each other, you may be able to get a replacement venturri tube without having to replace the entire burner unit.
The new style
OPD valves have a small brass ring located in the female
fitting on the LP tank. Over time this ring can work loose and then it
does not allow the male fitting to fully depress the OPD valve thus
reducing your gas flow
Using a small flat bladed screw driver tighten the small brass ring This
should solve your problem IF not you might want to remove the cap
(white) on your regulator and try slowly adjusting the regulator, make
small adjustments and try the BBQ My Weber if I set the front and back
burners to MED I get right at 350 degrees in 60 degree outdoor temps.
Adjusting the regulator will take some time to get it right but If it is
not your tank it is most likely your regulator out of adjustment
it sounds like the low temp limit switch, the one that cools the furnace down with the burner off and the thermostat open, when it cools to a point the fan stops, the other switch in burner area turns burner off/on, hope this helps
What type of gas supply line do you have? Is it black pipe or copper? If it is copper, there can be a film like substance that builds up on the inside of the copper. The debris will the get caught in a pre screen where the supply enters the valve thus cutting the supply of gas to the unit. Also, the thermocouple may be bad. You didn't say that you replaced it. Try replacing it as well. Also, you could have a limit switch turning the system off and thus cutting the gas off completely but it is highly unusual for the pilot to be cut off as well unless the pilot is being blown out when the gas is shut off. Also, turn the unit to fan only without calling for heat. Using a flame of some sort, put it into each baffle of the heat exchanger. If your flame is being blown around in one of the baffles, then you have a hole in the heat exchanger and what is happening is that the roll out switch is cutting the unit off and the air still moving through the heat exchanger is blowing the pilot out. I have seen this actually happen. If your furnace is in excess of 15 years old, it does need to be checked for possible holes. If it is in excess of 25 years old, it is a huge possibility that the unit has already developed a hole. If you feel hair coming out of one of the baffles, then shut the unit down immediately and have it replaced!
Get the installation manual for your range, and find the part on adjusting the low heat for the burners. On my Whirlpool, I found there is an adjustment screw inside the control knob shaft of each burner. The manual says turn the burner on low, remove the knob, then turn this screw until the flames are 1/4" high. Super-easy, it took me 5 minutes to do. I am sure all ranges have similar adjustments, might be in different locations - check the manual.
Make sure the unit is operating on the correct gas, Natural or Propane (LP). The sound you are experiencing is either not enough gas and the flame is burning inside the burner port(s) or too much gas and the flame is much larger than it has to be. At any rate, get a technician to check the gas pressure entering into the home. NOW!