On the last two times that I have started the system I have experienced a large explosion upon start-up.
I must say that I have travelled over some dirt roads and it could have some dust issues.but let me tell you more about the startup process.
I click the switch, walk around to the unit, wait for the tic, tic tic and then it would start, however
on the two recent starts it goes thru the tic,tic, tic up to three attempts and then...wooof ( a slight explosion) and its then alight.
Any thoughts from the gas experts??
Thanks for your replies.
Cheers from up near Kununurra.
PS I dont know why my subject wont accept the word...ho****er...
pps maybe I should use ...hot water...
-- Edited by Motorhomer13 on Tuesday 23rd of September 2014 06:58:07 PM
-- Edited by Motorhomer13 on Tuesday 23rd of September 2014 07:00:09 PM
-- Edited by Motorhomer13 on Tuesday 23rd of September 2014 07:01:45 PM
Cloak said
07:54 PM Sep 23, 2014
If possible have a close look at the ignition spark. Make sure it's discharging in the gas stream.
From your description it appears the burner surrounds are filling with gas and eventually spilling onto the spark
which when ignites has quite a pool to whooof through...
The vibration of driving can dislodge the probes sometimes.
Joe50 said
10:58 PM Sep 23, 2014
Motorhomer13 wrote:
PS I dont know why my subject wont accept the word...ho****er...
pps maybe I should use ...hot water...
The forum software has a very strict automatic censoring system ... look at the word formed by the letters it replaced with asterisks!
-- Edited by Joe50 on Tuesday 23rd of September 2014 10:59:54 PM
oldbobsbus said
07:55 AM Sep 24, 2014
I think Cloak has come up with one good answer another could be that there is some other things disturbing the mixture of gas and primary air and it is having trouble lighting.
If you can get a blast of compressed air up the burner tube or conversely unravel the end of a piece of thin rope and twist it up the burner tube it may dislodge the obstruction (Spider web, fluff or dirt and dust).. then see if that fixes it..
Baz421 said
12:10 PM Sep 24, 2014
oldbob knows about these things better than I,,, BUT this has happened to us when we turned the gas on after running the cylinder dry.
It took a while for gas to get to the ho****er system and it mustn't have coincided with the ignition cycle.
If we run the gas out (not common as the smell gets me awake enough to change cylinders) I start the stove first to get the gas into the line,, no problems with HWS ignition then.
Phil C said
09:43 AM Sep 28, 2014
Hi Guys
Heres my 5 pennies worth.
I know sod all about gas and a bit more about ho****er systems. We have ours on gas all the time and I have never heard it woof on start up. The ideas above sound like sense to me and it will be something I check when the anode gets a peek.
Cheers guys. Hope you are all well.
oldtrack123 said
03:19 PM Oct 1, 2014
oldbobsbus wrote:
I think Cloak has come up with one good answer another could be that there is some other things disturbing the mixture of gas and primary air and it is having trouble lighting.
If you can get a blast of compressed air up the burner tube or conversely unravel the end of a piece of thin rope and twist it up the burner tube it may dislodge the obstruction (Spider web, fluff or dirt and dust).. then see if that fixes it..
HI
Ditto
Regular Gas explosion such as that are not something to ignore !!!
They can & do occur but are a warning that all is not right.
it could be:
[a] that the spark may not in the gas stream,
Requiring a build up of gas in the furnace tube before gas reaches the Spark [spark electrode dislodged due to vibration?]
the ignitor module may be faulity
[c]Another cause could be an obstruction to the gas flow diverting it away from the ignition spark
You could try lighting it then turning the gas OFF @ the bottle or the line stop valve
When it has burnt the gas out see if you can observe the ignition while it is trying to light
Does it have a nice strong blue arc JUMPING across the ELECTRODE tip/s ??
Once it does ,light does it have a full sized flame?
Re lighting after a bottle replacement can mean a delay in actual lighting for the FIRST time after replacing the bottle But that should not be a problem all the time .unless you have a gas leak SOMEWHERE, emptying the lines when /if the gas bottle is turned OFF.
IF the bottle has been left turned on you can rule that out.
PeterQ
-- Edited by oldtrack123 on Wednesday 1st of October 2014 03:28:04 PM
-- Edited by oldtrack123 on Wednesday 1st of October 2014 03:29:08 PM
oldbobsbus said
08:18 PM Oct 1, 2014
oldtrack123 wrote:
oldbobsbus wrote:
I think Cloak has come up with one good answer another could be that there is some other things disturbing the mixture of gas and primary air and it is having trouble lighting.
If you can get a blast of compressed air up the burner tube or conversely unravel the end of a piece of thin rope and twist it up the burner tube it may dislodge the obstruction (Spider web, fluff or dirt and dust).. then see if that fixes it..
HI
Ditto
Regular Gas explosion such as that are not something to ignore !!!
They can & do occur but are a warning that all is not right.
it could be:
[a] that the spark may not in the gas stream,
Requiring a build up of gas in the furnace tube before gas reaches the Spark [spark electrode dislodged due to vibration?]
the ignitor module may be faulity
[c]Another cause could be an obstruction to the gas flow diverting it away from the ignition spark
You could try lighting it then turning the gas OFF @ the bottle or the line stop valve
When it has burnt the gas out see if you can observe the ignition while it is trying to light
Does it have a nice strong blue arc JUMPING across the ELECTRODE tip/s ??
Once it does ,light does it have a full sized flame?
Re lighting after a bottle replacement can mean a delay in actual lighting for the FIRST time after replacing the bottle But that should not be a problem all the time .unless you have a gas leak SOMEWHERE, emptying the lines when /if the gas bottle is turned OFF.
IF the bottle has been left turned on you can rule that out.
PeterQ
-- Edited by oldtrack123 on Wednesday 1st of October 2014 03:28:04 PM
-- Edited by oldtrack123 on Wednesday 1st of October 2014 03:29:08 PM
Peter are we trying to convert the average GN into an expert Hot Water service person or just be helpful with some general advice before they goto someone qualified to service the offending unit..
Any work on Gas appliances should be done by a qualified person and it is my opinion that only simple checks and tests should be advised that don't require the removal or adjustment of any of the equipment...
You would be the first to jump up and down if I were to post how to make a couple of electrical adapters that don't meet the standard and bypass some of the electrical safety equipment ..
On the last two times that I have started the system I have experienced a large explosion upon start-up.
I must say that I have travelled over some dirt roads and it could have some dust issues.but let me tell you more about the startup process.
I click the switch, walk around to the unit, wait for the tic, tic tic and then it would start, however
on the two recent starts it goes thru the tic,tic, tic up to three attempts and then...wooof ( a slight explosion) and its then alight.
Any thoughts from the gas experts??
Thanks for your replies.
Cheers from up near Kununurra.
PS I dont know why my subject wont accept the word...ho****er...
pps maybe I should use ...hot water...
-- Edited by Motorhomer13 on Tuesday 23rd of September 2014 06:58:07 PM
-- Edited by Motorhomer13 on Tuesday 23rd of September 2014 07:00:09 PM
-- Edited by Motorhomer13 on Tuesday 23rd of September 2014 07:01:45 PM
From your description it appears the burner surrounds are filling with gas and eventually spilling onto the spark
which when ignites has quite a pool to whooof through...
The vibration of driving can dislodge the probes sometimes.
The forum software has a very strict automatic censoring system ... look at the word formed by the letters it replaced with asterisks!
-- Edited by Joe50 on Tuesday 23rd of September 2014 10:59:54 PM
I think Cloak has come up with one good answer another could be that there is some other things disturbing the mixture of gas and primary air and it is having trouble lighting.
If you can get a blast of compressed air up the burner tube or conversely unravel the end of a piece of thin rope and twist it up the burner tube it may dislodge the obstruction (Spider web, fluff or dirt and dust).. then see if that fixes it..
oldbob knows about these things better than I,,, BUT this has happened to us when we turned the gas on after running the cylinder dry.
It took a while for gas to get to the ho****er system and it mustn't have coincided with the ignition cycle.
If we run the gas out (not common as the smell gets me awake enough to change cylinders) I start the stove first to get the gas into the line,, no problems with HWS ignition then.
Heres my 5 pennies worth.
I know sod all about gas and a bit more about ho****er systems. We have ours on gas all the time and I have never heard it woof on start up. The ideas above sound like sense to me and it will be something I check when the anode gets a peek.
Cheers guys. Hope you are all well.
-- Edited by oldtrack123 on Wednesday 1st of October 2014 03:28:04 PM
-- Edited by oldtrack123 on Wednesday 1st of October 2014 03:29:08 PM
Peter are we trying to convert the average GN into an expert Hot Water service person or just be helpful with some general advice before they goto someone qualified to service the offending unit..
Any work on Gas appliances should be done by a qualified person and it is my opinion that only simple checks and tests should be advised that don't require the removal or adjustment of any of the equipment...
You would be the first to jump up and down if I were to post how to make a couple of electrical adapters that don't meet the standard and bypass some of the electrical safety equipment ..