Re: Charmglow tabletop heater: how do I remove the dome?
First make sure you have propane. Low propane can cause this too. Presuming its not the easy fix, its probably spiders that have built a web in the venturi (air) tube.
Remove the screws attaching the screen/shield to the body and it can be lifted from the body without taking off the aluminum heat dispersing shield. Next remove the 4 screws holding the burner in place and you should be able to lift out the unit to clean of of the spider webs. High pressure water may or may not work. You may need to use something like a pipe cleaner.
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sounds like the air to gas setting is wrong, not enough air intake. there should be an air adjuster near the burn box. where the gas goes into the burn box. fallow the gas line to find it. adjust it till it burns correct. there also should be a gas pressure adjuster to, it should be near the burner.
You have to be careful when adjusting the flame because you can cause carbon monoxide issues. There are two adjustments. the orifice hood and the air shutter. the orifice hood when turned will adjust the flame amount and the air shutter will adjust the burning of the gas. the hood will be on the line feeding the burner usually on them safety valve and should be a 1/2 inch nut. The air shutter is the door like opening on the burner tube itself. Your flame should be a nice blue cone without any yellow and should not blow and walk off the burner.
You need to start by cleaning burner tube and pilot intake , sounds like spiders have probably spun a web in there. If flame is yellowish, it's not getting enough air. You can buy a barbecue burner brush, long and flexible, and run it through burner tube to clean out web, and if pilot is yellow as well, there is a small hole in side of fitting where it attaches up near burner that needs to be cleaned out with paper clip or even better, compressed air. After cleaning burner, adjust air shutter to get nice blue flame, with just a hint of yellow at tip. The idea there is to get blue flame, but not a roaring flame that is jumping off the burner. A spider web in there will usually allow propane through, but restricts air mixture, thus causing yellow flame (rich mixture) and soot to build up.
If your propane tank is not just about to run empty, then you can probably thank little spiders. When a gas burning appliance sits idle for a week or more outdoors, spiders like to build nests in the venturi tubes (that's the tube with the holes in it where the combustion air gets sucked in). This changes the way the combustion air mixes with the gas and causes the gas to not burn completely. The incomplete combustion is not very hot, and so the flame appears yellow. This is not efficient. It wastes gas, is too cool for grilling steak and creates soot residues. This is very common on gas grills (bottled propane or piped natural gas). It also happens to pool heaters. Fortunately, the fix is easy, and you usually don't need to take anything apart. Get a piece of stiff nylon string from a weed-wacker, about 12 inches long. With the burner cool, push the string into any hole in the venturi tube and spin it by rolling it between your fingers. The spider nests are sticky (made from the same stuff as spider webs) and they usually adhere to the nylon string. Not sure what the venture tube is? It's going to be between the valve and the burner. The valve shoots a stream of gas into the venture tube through a pinhole nozzle called an "orifice". You can do a Google image search for BURNER VENTURI TUBE to see lots of different types. Every gas burning appliance uses some form of venturi tube.
your not getting enough air to gas mixture to burn the gas completely,you will see an orangish/yellowish flame if the air mix is too low,access the burner tube and adjust the air throttle on the tube entry end till its a clean blue flame
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.
In a gas dryer, heat is provided by a gas heater that is controlled by an air shutter. The gas heater is generally the source of no-heat or drying problems. You can often correct such problems by adjusting the air shutter on the gas burner, which is located along the bottom of the dryer.
To adjust the shutter, take out the screws and remove the panel that covers the gas flame. Turn on the dryer so the flame is burning. If the flame has a deep blue color and you hear air whistling around the burner, the air/gas mixture is receiving too much air. If the flame has a yellow tip, the mixture is not receiving enough air. Turn the thumbscrew or loosen the two screws slightly to increase or decrease the flow of air to the burner. Keep turning until the flame is a light blue color, without any yellow, and the whistling stops.