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Old February 28th 05, 01:27 AM
Fray Bentos
 
Posts: n/a
Default yellow flame in gas fire

Hello all. I have a gas fire.

http://www.gasapplianceguide.co.uk/R...Black_03_1.jpg

anyway the middle 2 bars burn blue with the top quarter yellowish. The outer
two bars are blue / orange normal

I have cleaned the jets that feed the venturi (?) and the venturi (?) itself

the venturi is the block with the holes in that the gas burns from. (i
think)

Why is this ? the flue/chimney is good with air being drawn through and
besides, the outer two bars are ok.

tia




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Old February 28th 05, 01:33 AM
John Rumm
 
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Default

Fray Bentos wrote:

Why is this ? the flue/chimney is good with air being drawn through and
besides, the outer two bars are ok.


Does it tend to spend most of its lit life with just the inner two
burners on? When this is the case, you often see a difference in the
colour of the centre burners after a while. I presume this is due to
accumulation of combustion deposits on the radiant reflector and grill.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
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| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/
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Old February 28th 05, 09:21 AM
Senior Member
 
First recorded activity by DIYBanter: Dec 2004
Posts: 174
Default

Quote:
Originally Posted by John Rumm
Fray Bentos wrote:

Why is this ? the flue/chimney is good with air being drawn through and
besides, the outer two bars are ok.


Does it tend to spend most of its lit life with just the inner two
burners on? When this is the case, you often see a difference in the
colour of the centre burners after a while. I presume this is due to
accumulation of combustion deposits on the radiant reflector and grill.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/
Just to be double sure take the venturi / flame mesh assembly off and wash it under the tap (flush in both directions) to make sure no lint or anything remains, all the mesh the flame comes through is clear and no fluf (lint) lurking within/beneath. To check operation of jets or for blockages in the tubes you would need to gas rate the fire. If everything is clean, it passes the gas rate test flue flow test and spillage test with flying colours, you're probably OK as far as I can say without seeing it.
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Old February 28th 05, 10:02 AM
Fray Bentos
 
Posts: n/a
Default


"John Rumm" wrote in message
...
Fray Bentos wrote:

Why is this ? the flue/chimney is good with air being drawn through and
besides, the outer two bars are ok.


Does it tend to spend most of its lit life with just the inner two
burners on? When this is the case, you often see a difference in the
colour of the centre burners after a while. I presume this is due to
accumulation of combustion deposits on the radiant reflector and grill.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/



It is 6 years old and yes, it is rare to use the outer 2 bars.
When its heated up, you can see the flames in the inner 2 bars. Never used
to be like that.


tia


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Old February 28th 05, 11:26 AM
Mary Fisher
 
Posts: n/a
Default


"Fray Bentos" wrote in message
.uk...
Hello all. I have a gas fire.

http://www.gasapplianceguide.co.uk/R...Black_03_1.jpg

anyway the middle 2 bars burn blue with the top quarter yellowish. The
outer
two bars are blue / orange normal

I have cleaned the jets that feed the venturi (?) and the venturi (?)
itself

the venturi is the block with the holes in that the gas burns from. (i
think)


It's quite difficult to clean this well, it becomes blocked with dust of all
kinds including particles of rust. I spend ages pricking each hole with a
fine sewing needle, prodding it several times. It does help. The ideal
solution would be to blow out the dirt in the same direction as the gas flow
but we can't do that easily with ours.

Mary




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Old February 28th 05, 11:54 AM
doozer
 
Posts: n/a
Default

A yellow flame is an indication that less than the optimal amount of
oxygen is being using during combustion and some carbon is being
produced (carbon monoxide will also be produced under these
circumstances but as long as you have a good draw on your chimney that's
not a problem). I am not a gas fire specialist, BTW, but that is why the
flame is yellow.

Graham

Fray Bentos wrote:
Hello all. I have a gas fire.

http://www.gasapplianceguide.co.uk/R...Black_03_1.jpg

anyway the middle 2 bars burn blue with the top quarter yellowish. The outer
two bars are blue / orange normal

I have cleaned the jets that feed the venturi (?) and the venturi (?) itself

the venturi is the block with the holes in that the gas burns from. (i
think)

Why is this ? the flue/chimney is good with air being drawn through and
besides, the outer two bars are ok.

tia



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Old February 28th 05, 02:10 PM
Fray Bentos
 
Posts: n/a
Default


"doozer" wrote in message
news
A yellow flame is an indication that less than the optimal amount of
oxygen is being using during combustion and some carbon is being
produced (carbon monoxide will also be produced under these
circumstances but as long as you have a good draw on your chimney that's
not a problem). I am not a gas fire specialist, BTW, but that is why the
flame is yellow.

Graham

Fray Bentos wrote:
Hello all. I have a gas fire.

http://www.gasapplianceguide.co.uk/R...Black_03_1.jpg

anyway the middle 2 bars burn blue with the top quarter yellowish. The

outer
two bars are blue / orange normal

I have cleaned the jets that feed the venturi (?) and the venturi (?)

itself

the venturi is the block with the holes in that the gas burns from. (i
think)

Why is this ? the flue/chimney is good with air being drawn through and
besides, the outer two bars are ok.

tia




I have it fixed. I vacuumed out the venturi. Must have been a bit clogged
inside. Rather than disconnect it all, I had the ingenious idea of using a
straw taped onto the end of a vac pipe. worked a treat.

fray bentos


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Old February 28th 05, 04:22 PM
Mary Fisher
 
Posts: n/a
Default


"Fray Bentos" wrote in message
. uk...


I have it fixed. I vacuumed out the venturi. Must have been a bit clogged
inside. Rather than disconnect it all, I had the ingenious idea of using a
straw taped onto the end of a vac pipe. worked a treat.


Excellent idea. I'll try it next time I need to.

Mary

fray bentos




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Old February 28th 05, 10:37 PM
Andrew Gabriel
 
Posts: n/a
Default

In article ,
"Mary Fisher" writes:

"Fray Bentos" wrote in message
. uk...


I have it fixed. I vacuumed out the venturi. Must have been a bit clogged
inside. Rather than disconnect it all, I had the ingenious idea of using a
straw taped onto the end of a vac pipe. worked a treat.


Excellent idea. I'll try it next time I need to.


I've just had this vision of a vacuum cleaner turning into a jet
engine, if you should happen to try this without switching the
gas off first ;-)

--
Andrew Gabriel
  #10   Report Post  
Old February 28th 05, 11:46 PM
Mary Fisher
 
Posts: n/a
Default


"Andrew Gabriel" wrote in message
...
In article ,
"Mary Fisher" writes:

"Fray Bentos" wrote in message
. uk...


I have it fixed. I vacuumed out the venturi. Must have been a bit
clogged
inside. Rather than disconnect it all, I had the ingenious idea of using
a
straw taped onto the end of a vac pipe. worked a treat.


Excellent idea. I'll try it next time I need to.


I've just had this vision of a vacuum cleaner turning into a jet
engine, if you should happen to try this without switching the
gas off first ;-)


Well, it's a nice image but think about it. The gas wouldn't be turned on
unless thee was a flame. If there was a flame it would be too hot to get
near ...

Mary

--
Andrew Gabriel





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