Eberspacher exhaust size

[Jabamusic]

Thoughts wanted.................

I have a perfect length of 22mm eber exhaust, but actually need 24mm (to fit the necessary components).
As it isn't cheap stuff to buy and I think I have seen adapters, does anybody know if the 2mm will cause a problem to the heater?

Thanks

 

[pcatterall]

Thoughts wanted.................

I have a perfect length of 22mm eber exhaust, but actually need 24mm (to fit the necessary components).
As it isn't cheap stuff to buy and I think I have seen adapters, does anybody know if the 2mm will cause a problem to the heater?

Thanks

Didnt want to 'quote' but couldn't see any quick reply!!
I think the issue is the length of the reduced size you will need. I you were pushing the correct 25mm pipe to its length limit ( about 6 feet?) then there will be issues.
Calculate the cross section sizes of 22 and 25mm to get the real comparison and look up the permited length in your manual. The fewer connections and joints inside the boat the better of course.
PS The ability for a quick reply has now appeared on screen!!

 

[Jabamusic]

Hi
So, if I understand correctly, there is a balance to be done between the exhaust length AND the hot air vent pipe (ie that which carries the nice warm stuff into the cabin).

In my case, I have 2.5 metres of exhaust and about 4 metres of ducting carrying the warmed air into the cabin.
Any thoughts?
Thanks

 

[savageseadog]

This might not be recommended but I would just try it and monitor to see if the heater works and the exhaust temperatures are within limits. I'm just saying what I would do but I've got thermal imaging cameras etc. It would help if the exhaust wasn't insulated.

What heater is it?

 

[Jabamusic]

D1LCC.

The exhaust will be well lagged and no i don't have a thermal imaging camera!

 

[pampas]

Balancing of pipe is to the furnace input air not the warn air side. But how one works that out IS not mentioned in any manual I have seen.

 

[pcatterall]

Balancing of pipe is to the furnace input air not the warn air side. But how one works that out IS not mentioned in any manual I have seen.

I thought the balance between exhaust and intake should be by using equal lengths but that was equal lengths of the same diameter pipe.
For what its worth my eber test rig has 2m of 25mm exhaust and nil inlet!! they seem to enjoy that!!

 

[Jabamusic]

Ok..........seeking clarification here................
According to what I can see, an eber has three i/o's; air in, dirty exhaust out and warm , heated and clean air out.
So, what/which do you have to balance?
Jaba

 

[VicMallows]

Theory is you should balance the COMBUSTION air intake (usually a rubber pipe about 25mm) with the EXHAUST length. Not really that critical.

The outlet air which heats the cabin is quite separate and should be as unrestricted as possible. You can chose whether the input air for heating comes from the cabin or from outside. Outside is often recommended as it brings in fresh air, but most installations will struggle in winter temperatures. I recycle the cabin air.

 

[Jabamusic]

Theory is you should balance the COMBUSTION air intake (usually a rubber pipe about 25mm) with the EXHAUST length. Not really that critical.

You can chose whether the input air for heating comes from the cabin or from outside. Outside is often recommended as it brings in fresh air, but most installations will struggle in winter temperatures. I recycle the cabin air.

That's helpful, thanks................. now we wait for the flood of responses about whether to take in fresh or recycle cabin air.............All your fault Vic

 

[David2452]

I often adapt up from 22mm to 24mm but never down, It is not expensive to buy lengths of 24mm exhaust unless you need a very long length, in which case it is all the more reason not to reduce.

 

[David2452]

A word on balancing mentioned earlier, with the exception of the lower powered Wallas units, these things are not balanced and the air inlet and exhaust lengths (provided they are within the parameters in the manual) are not that important. These non horizontal evaporator units are forced air combustion not balanced flue.