Eberspacher DIY Installation: Air Ducting Component Ratings

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I recently moved my Ebers to make it accessible for maintenance and repair. In doing so, it seemed 'reasonable' to use a 90deg reducer at the output of the D2 to match the slightly revised hot air ducting run. I had not realised (entirely Mea Culpa) that this reducer uses up 75% of the allowable duct resistance rating i.e. 4.5 out of a total of 6 for the D2. The result was a fully cooked heater with failed ECU and blower. Just as FYI, the straight reducer has a figure of 0 (zero) according to my information.

I mention this because, although it may have been obvious to others, in 2 years of searching websites to glean Ebers knowledge I have not seen this mentioned specifically. I apologise if all this is common knowledge but repetition can do no harm.

Ah well
Bob
 
Do you mean a 90degree output head versus a straight one? rather than some kind of pipe diameter reducer? More than I would have thought ( though I accept the figures)
certainly one to remember.
Why is your ECU stuffed? it should have just switched off.
 
Standard practise when planning an install (well a proper one anyway) is to do all the numbers on this stuff, and a lot of other numbers besides. One of the worst things you can fit, uless you have only one short duct like in a van or truck is 90 degree bends, and even worse if it is straight on the outlet hood as it seems in this case. It would only switch off if it had an actual overheat, this kind of thing just reduces life through constantly being just under overheat, one of the reasons the overheat ratings of the later units was reduced (also to comply with new regulations for CE marking) as well as this kind of fault.
 
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Eberspacher 90deg Bend

pcatterall said:
Do you mean a 90degree output head versus a straight one? rather than some kind of pipe diameter reducer? More than I would have thought ( though I accept the figures)
certainly one to remember.
Why is your ECU stuffed? it should have just switched off.
Click to expand...

Peter, Yes - a 90deg output head.
My info came from Product Catalogue 03-2012. Have a look at P68 [DUCTING RATING GUIDE FOR AIRTONIC D2] Item 6, which looks right, although its description is "Spherical reduction hood, 60 dia.". The straight hood is described as "Reduction hood, 60 dia.". The 4.5 for the 90deg outlet seems consistent with the figure quoted (4.1) for a simpler bent pipe - Item 7.

The catalogue is here (sorry - do not know how to do a hyperlink)
http://www.espar.com/documents/Product Catalogue 03-2012.pdf

As to the ECU, I suspect that two attempts to fire up (I can't recall the time spacing) caused some heat accumulation. I'll only worry about that if the next heater cooks! (I have reverted to the straight hood.)

David 2452,
Understood.

Cheers
Bob
 
Bob, just pursuing the ECU issue. How do you know it is US? Have you got diagnosis on your timer? You can send it to me to check if you want FOC. Of course it may have burnt 'proper' ie black goo emanating in which case dont bother !!
Are you just replacing the ecu? heaters 4 U on fleebay are doing D2s for £250 which is as cheap as I have seen.
Good luck
 
Eberspacher Ducting Resistance

Peter,

... just pursuing the ECU issue. How do you know it is US?
Thanks to my rearranged siting, I was able to whip the heater unit out of the boat in 10 mins (previously, sensible access required a small boy or removal of the engine). I took it to my local Ebers dealer who tested it on his jig and pronounced the ECU dead.

.....Have you got diagnosis on your timer?
No, but I know know to install one on my next floating challenge (I hope to change hulls in the next few months)

......You can send it to me to check if you want FOC. Of course it may have burnt 'proper' ie black goo emanating in which case dont bother !!
Thanks for the kind offer, but as above, it has been declared U/S. There was no goo.

....Are you just replacing the ecu? heaters 4 U on fleebay are doing D2s for £250 which is as cheap as I have seen.
I am in no hurry to worry about replacement as we are ashore for the next quarter, but thanks for the tip. I'll 'save search' heaters 4 u.

Despite the problems, sorting the Ebers has been an interesting learning experience, right from differentiating between D1L, D1LC, D1LCcomfort, D1LCcompact etc etc, through to clearing years of diesel bug sediment, small changes in combustion pipe sizes and fuel pump volumes!

Cheers
Bob
 
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