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Oil fired Boiler Loud Bang on Start Up. m 12-27-2007
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Posted by m on December 27, 2007, 10:35 pm
I have a new heating system, It is an oil heated Weil Mclian Gold
Series with a Beckett Burner. The service guy replaced the original
nozzle (after one year) with a 1 gal/hour nozzle. The original was
1.25 gal/hour.
Now the system fires up with a bang. Also, what is this with the pump
running for 30 seconds before it ignites ? Seems like a bad design.
Doesn't the combustion chamber fill up with un burned fuel and then
ignites? This is inherent in the design of these new systems; tey run
for 30 seconds before ingition and then when the shut down the pump
continue to run for 30 seconds. My old sysem didn't have this and
there was never any loud bang when the oild ignited.

Also, I dont recall the bang noticeable when the burner had the 1.25
gal/hour nozzle.

Anyone have similar experiece?

M


Posted by Edwin Pawlowski on December 28, 2007, 5:50 am

>I have a new heating system, It is an oil heated Weil Mclian Gold
> Series with a Beckett Burner. The service guy replaced the original
> nozzle (after one year) with a 1 gal/hour nozzle. The original was
> 1.25 gal/hour.
> Now the system fires up with a bang. Also, what is this with the pump
> running for 30 seconds before it ignites ? Seems like a bad design.
> Doesn't the combustion chamber fill up with un burned fuel and then
> ignites? This is inherent in the design of these new systems; tey run
> for 30 seconds before ingition and then when the shut down the pump
> continue to run for 30 seconds. My old sysem didn't have this and
> there was never any loud bang when the oild ignited.
>
> Also, I dont recall the bang noticeable when the burner had the 1.25
> gal/hour nozzle.
>
> Anyone have similar experiece?

Sounds like it is set up wrong. The burner often runs before the oil as a
pre-purge of the combustion chamber, then the ignition and fuel come on.
Same with the post purge. As for the nozzle size, the depends on what your
needs are as the burner can often accommodate a range of sizes. What you
need is a competent service tech.



Posted by RBM on December 28, 2007, 7:20 am
The new burners have a solenoid valve that opens to allow the oil in at the
proper time. It's not spewing oil in the beginning of the cycle, just
purging





>I have a new heating system, It is an oil heated Weil Mclian Gold
> Series with a Beckett Burner. The service guy replaced the original
> nozzle (after one year) with a 1 gal/hour nozzle. The original was
> 1.25 gal/hour.
> Now the system fires up with a bang. Also, what is this with the pump
> running for 30 seconds before it ignites ? Seems like a bad design.
> Doesn't the combustion chamber fill up with un burned fuel and then
> ignites? This is inherent in the design of these new systems; tey run
> for 30 seconds before ingition and then when the shut down the pump
> continue to run for 30 seconds. My old sysem didn't have this and
> there was never any loud bang when the oild ignited.
>
> Also, I dont recall the bang noticeable when the burner had the 1.25
> gal/hour nozzle.
>
> Anyone have similar experiece?
>
> M
>



Posted by Pete C. on December 28, 2007, 7:31 am
m wrote:
>
> I have a new heating system, It is an oil heated Weil Mclian Gold
> Series with a Beckett Burner. The service guy replaced the original
> nozzle (after one year) with a 1 gal/hour nozzle. The original was
> 1.25 gal/hour.
> Now the system fires up with a bang. Also, what is this with the pump
> running for 30 seconds before it ignites ? Seems like a bad design.
> Doesn't the combustion chamber fill up with un burned fuel and then
> ignites? This is inherent in the design of these new systems; tey run
> for 30 seconds before ingition and then when the shut down the pump
> continue to run for 30 seconds. My old sysem didn't have this and
> there was never any loud bang when the oild ignited.
>
> Also, I dont recall the bang noticeable when the burner had the 1.25
> gal/hour nozzle.
>
> Anyone have similar experiece?
>
> M

The ignitor electrodes are most likely out of adjustment causing delayed
ignition. Get the service guy to check and adjust them properly.

Posted by PaPaPeng on December 28, 2007, 4:49 pm

>I have a new heating system, It is an oil heated Weil Mclian Gold
>Series with a Beckett Burner. The service guy replaced the original
>nozzle (after one year) with a 1 gal/hour nozzle. The original was
>1.25 gal/hour.
>Now the system fires up with a bang. Also, what is this with the pump
>running for 30 seconds before it ignites ? Seems like a bad design.
>Doesn't the combustion chamber fill up with un burned fuel and then
>ignites? This is inherent in the design of these new systems; tey run
>for 30 seconds before ingition and then when the shut down the pump
>continue to run for 30 seconds. My old sysem didn't have this and
>there was never any loud bang when the oild ignited.
>
>Also, I dont recall the bang noticeable when the burner had the 1.25
>gal/hour nozzle.
>
> Anyone have similar experiece?
>
>M


Go stand by the furnace and see what made the bang. My gas furnace
also went bang, the bang being a metallic noise as in hitting the
sheet metal sides with a fist. The bang occured during start-up as
well as when the fan motor shut off and slowed down.

The cause was the squirrel cage fan that looked OK. So I took it out
to see if there was anything I could fix as well as use the
opportunity to clean up the insides. The shaft was deeply scoured.
The bronze bearings ovalled. I replaced the 3/4 inch shaft and
repaced the bearings. Worked fine for 15 years now.

In my earlier annual maintenance routine I had overtightened the fan
belt. It should be tensioned with just the weight of the hinge
mounted motor. The motor should be able to turn the fan without the
belt slipping. I also added grease to the dry bronze bearings and
periodically put in 10/30 motor oil to fix the squeaks and bangs.
They worked for a time then I would have to repeat the exercise and
tension the belt again. What happened was the heat had baked the
grease hard and instead of lubricating the shaft it became a binder
and an abrasive. That scoured the shaft and wore down the bearings.
Motor oil lube made the problem worse as now there was a slurry of
metal filings and oil to scour the metal. Tensioning the fan belt of
course added to the wear rate.



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