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 Topic: Carver cascade 2 burnt out
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13/3/2012 at 5:05pm
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This is a known fault with the older units, it only happens when the wind blows directly at it.
There is a modified flue cover you can get which combats the problem, but they aint cheap (so I haven't bothered).
I don't actually know how to tell the difference, for all I know mine may have the modified flue on it already (would like to see pics of both for reference).
They're pretty simple units to get in & out, if you are reasonably competent with these things. I've had mine out a couple of times, fitting a new water inlet. I was quite annoyed to find sealant all round the gas connection. It's a compression fitting, so shouldn't have anything on it at all, apart from an olive.
Also the old water inlet had sealant plastered all over it, & that has an O ring, so likewise shouldn't have anything else on it.
Just common plumbing/engineering practice, but surprising how many fitters don't know.
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Matt.
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13/3/2012 at 7:46pm
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Outfit: http: www.arcsystems.biz
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Apart from what said on my website under 'safety issues' the main problem is incorrect fitting of the burner module.
The module is screwed and held under the gas valve on the right hand side, there is slack in the screw holes which allows the weight of the rest of the module to hang down to the left hand side.
This leaves a gap in the seal which allows another source of oxygen from inside the van should the wind block the main source coming through the balanced flue.
Fitting the module correctly blocks off this secondary source, this simply means lifting the left hand end as far as it goes without force and finish tightening the screws, now the seal is as high as it can be and doing it's job
Now under the same circumstances the flame is totally starved of oxygen and goes out, the module will attempt a relight cycle and if it fails after a few seconds and locks out safely.
A similar statement regards fitting is printed on every invoice I send out!
I also draw attention to it while talking to private customers and ask them to refer to the invoice to remind them when fitting, I also tell them to ring me if they are in any doubt.
So once this has happened, the module needs a total check and repair, not fitting a few parts and hoping?!
On that subject and as a matter of policy, I have never supplied spares for burner modules, ie, it's a 'module', a 'unit', and should only be supplied as such.
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14/3/2012 at 11:50pm
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Quote: Originally posted by arc systems on 14/3/2012
No you don't 'need' a new type flue but when something like a gas burner module as fitted to the cascade water heater is removed, then there is usually a reason?.
I'd then think it foolish to try putting another module in and trying to light it, without first knowing that reason and making sure it's safe to do so?!
So in this situation using a competent person to test everything would be the only safe way forward.
I would also doubt any on-line fitting instructions include the above fitting advice I've mentioned, it's my advice you see, Carver did not offer that, or, any other written fitting instructions for that matter.
On the subject of buying second hand, I can generally sort out a burner module to sell out right.
Coming with a 12 month warranty, it will be a far better deal than you'll ever get off ebay! and I doubt it will be any dearer either!!
Sorry, I think you've misunderstood me. My talk of a 2nd hand unit was in reply to the above post, I was referring to an entire heater, not a burner module. & the same refers to the online instructions I talked about, this was installation instructions for the complete water heater into a caravan.
I have edited my above post, to make things a little clearer.
Of course I completely agree with what you've said though. These units were built to last in many respects (& when maintained properly, which is why I reckon Truma stopped producing them, as they are so obviously a superior design to the Ultrastore) & if one has been tampered with by someone unknown, you should obviously do your best to find out what was done & (perhaps more importantly) WHY???
Post last edited on 15/03/2012 00:01:21
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Matt.
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