Webasto thermotop C Installation Instructions Manual - Plumbing Options
Webasto Part Number : 4110310A
Issue No: 02 : 10th November 2010
Matthew Millard
In the interests of continued development, we reserve the right to change
specifications without prior notice
© Webasto Product UK Limited
Marine Comfort
Glycol, (Antifreeze) Percentage of concentration.
As with any type of water heating system it is necessary to add some kind of
corrosion inhibitor. In the case of Webasto diesel marine water heater we use
ethylene glycol otherwise know as glycol or antifreeze. The antifreeze must be glycol
and NOT methanol based. The other important issue to remember is using the correct
quantity. For Webasto heating systems we recommend a glycol content of 25%
maximum. The reason we need to add glycol to the heating circuit is to prevent
corrosion and freezing. The only drawback to using glycol is that it is not a very good
vehicle for carrying heat so we only use 25% maximum. It is the water that gets hot
and not the glycol. If we used 100% glycol the radiators would take an extremly long
time to get up to temperature if at all!
Glycol Pre-Mixing.
Be absolutly sure to pre mix the glycol & water before filling the system as the glycol
will not mix on its own without assistance. If the glycol is not pre mixed there will be
slugs of hot water and cool glycol circulating around the system.
Additives
Please do not add any additives to the water cooling circuit. The only things that are
permitted inside the heaters hot water circuit are : Water and Glycol. Do not add any
additives for instance 'leak cures' or other 'plumbing fixes in a bottle'. It’s a pointless
exercise fixing symptoms, fix the problem. If you have a leak then you need to fix the
leak!
Types of Pipe.
If your going to use Hep2o pipe then use Hep2o fittings and pipe liners. Likewise if
your using JG Speedfit use JG Speedfit fittings. Do not mix and match different
brands. Chrome pipe should be avoided when using any push fit pipe fittings. The
problem with chrome is that its an extremely hard metal and the push fit fittings
cannot bite into the chrome and consequently when they are under pressure they will
pop off and you will get wet.
Pipe Preparation.
Use they correct tool to cut the pipe, copper pipe use a pipe saw, plastic pipe use a
plastic pipe cutter such as those made by Hilmor. Do not use a hacksaw.
If plastic pipe is used then always fit the push in liners.
When the heating circuit is completed, prior to connection to the heater make up
some temporary tails and affix to the heating spine to flush out any installation debris /
dirt that may have found its way into the system.
Bleed the water system
Ensure that all the air is bled from the water circuit and the header tank level is
maintained or if a pressure system is used make sure the pressure remains constant
as the air is been expelled.
PLUMBING OPTIONS
WATER (Hints & Tips)
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