My Bryant 373LAV furnace has different flame pattern from what is shown in the manual (http://www.gogeisel.com/geiselonline...CAV_Gas_OM.pdf) . While in the book flame comes straight from the front of the burner tubes, in my furnace flame starts below the front of the flat panel that connects burners.

Is it normal or not? Should I be concerned and call for service?

If possible, take a pic of what you describe and post it here.

Please see attached pictures. It's hard to see on the photos, but there is a little flame on the side of each burner tube and both "flame patterns" that are coming from the tube are connected.

You might be able to see (pic 072) a bit of flame on the left side from the left burner. The blue glow between two flame patterns where the ignitor is located also represent thin layer of burning gas, so both major flame patterns are also connected.

Is it normal or not?

P.S.: No complaints on the furnace so far, I just want to make sure that everything is OK.

I was not sure that the picture was successfully uploaded, so I am repeating it again.

Uhh, the attachment didn't transmit... oh, there it is!

What is visible in the pic is limited, but does not appear unusual. This burner design is such that some "spillage" of flame will occur at the edges. If you are truly concerned or if what you see now is different than what you are accustomed to, a professional evaluation may be in order.

To be on the safe side I would use a gas pressure gauge and see if the pressure is the same that is on the furnace label. The burn looks good but I can see where it is back in the burner tube a bit and discolored. If the gas pressure is off it can cause this to happen.

Normally a good service person will check the gas pressure on a furnace tune up besides the cleaning etc.

Thank you both for the quick response.

I was considering to invite service person anyway. The question is how to recognize "good service person" from a duct cleaner. Even price is not always adequate identification. Can you give me any helpful hints or key questions to ask?

By the way, could the possibly low gas pressure be caused by the fact that we are in the middle of heating season. If the adjustment of the input pressure will be made now the pressure can be more than normal in the spring.

P.S.: One more picture is attached.

Now it should be attached.

Visit bryant.com to find a recommended dealer in your area.

By the way, could the possibly low gas pressure be caused by the fact that we are in the middle of heating season. If the adjustment of the input pressure will be made now the pressure can be more than normal in the spring.

Usually not. That is why there is a main gas pressure regulator outside and also one on the furnace to stop this from happening.