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Pilot flame too intense oparr@hotmail.com 10-14-2007
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Posted by oparr@hotmail.com on October 14, 2007, 3:52 pm
It's wasting gas and killing thermocouples. Finally decided to
research this after another thermocouple died today after only two or
three seasons. The boiler's manual shows a pilot flame profile but
unfortunately I'm unable to view the actual flame from the side so
I've adjusted the flame so that the thermocouple shows no signs of
glowing red but is obviously hot enough to maintain pilot gas flow.
Does this make sense? Thermocouple is centered properly and flame is
hitting it in the right place. I could tell based on where started to
glow first when lighting the pilot before it was adjusted.


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Posted by Tony Hwang on October 14, 2007, 4:57 pm
oparr@hotmail.com wrote:
> It's wasting gas and killing thermocouples. Finally decided to
> research this after another thermocouple died today after only two or
> three seasons. The boiler's manual shows a pilot flame profile but
> unfortunately I'm unable to view the actual flame from the side so
> I've adjusted the flame so that the thermocouple shows no signs of
> glowing red but is obviously hot enough to maintain pilot gas flow.
> Does this make sense? Thermocouple is centered properly and flame is
> hitting it in the right place. I could tell based on where started to
> glow first when lighting the pilot before it was adjusted.
>
Hi,
Some gas valves have a screw for adjusting pilot flame size.

Posted by oparr@hotmail.com on October 14, 2007, 5:03 pm
>
> Hi,
> Some gas valves have a screw for adjusting pilot flame size.

I know, already adjusted flame.



Posted by Meat Plow on October 14, 2007, 5:05 pm
On Sun, 14 Oct 2007 12:52:47 -0700, oparr@hotmail.com wrote:

> It's wasting gas and killing thermocouples. Finally decided to
> research this after another thermocouple died today after only two or
> three seasons. The boiler's manual shows a pilot flame profile but
> unfortunately I'm unable to view the actual flame from the side so
> I've adjusted the flame so that the thermocouple shows no signs of
> glowing red but is obviously hot enough to maintain pilot gas flow.
> Does this make sense? Thermocouple is centered properly and flame is
> hitting it in the right place. I could tell based on where started to
> glow first when lighting the pilot before it was adjusted.

If it's hot enough to maintain the pilot that should be fine. I've
actually adjusted pilots using an adapter inline with the thermocouple
that gave me a test point to monitor the voltage the thermocouple produced.
There is a point where adding more flame makes no change in the voltage
and that's usually with a very minimal flame, just enough to surround the
thermocouple.


Posted by oparr@hotmail.com on October 14, 2007, 5:09 pm
>
> If it's hot enough to maintain the pilot that should be fine. I've
> actually adjusted pilots using an adapter inline with the thermocouple
> that gave me a test point to monitor the voltage the thermocouple produced.
> There is a point where adding more flame makes no change in the voltage
> and that's usually with a very minimal flame, just enough to surround the
> thermocouple.

Unfortunately, what's happening now is that the pilot is fine until
the main burner kicks in then it dies. I'll increase the flow until
all is well on both fronts. Trial and error I guess.



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