Installation Instructions
Seite/Page 60 - Kaptitel/Chapter 6: Installation Instructions 18.12.15
6.4.3 Installation of the through hull fitting in Yachts - scheme
Fig. 6.4.3-1: Position of the through hull fitting It is good practice for yachts to use a through hull fitting
with an integrated strainer. The through hull fitting (raw
water intake) is often mounted against the sailing
direction to induce more water intake for cooling.
For Panda generators, the through hull inlet should NOT
point in the sailing direction! When sailing at higher speeds
more water will be forced into the inlet than the pump can
handle and your generator will flood.
6.4.4 Quality of the raw water sucking in line
In order to keep the suction resistance in the line at a minimum, the raw water intake system must have an inner
diameter of at least 1" (25 mm).
This applies also to installation components such as through-hull fitting, sea cock, raw water filter etc.
The intake suction line should be kept as short as possible. Install the raw water inlet in close proximity to the
genset.
After start-up the cooling water quantity must be measured (e.g. by catching at the exhaust). The flow rate,
as well as the necessary cross section of the cooling water pipe see section 9.10, “Diameter of conduits,”
on page 207
6.4.5 Generator installation above waterline
The Panda is equipped with a water intake pump mounted on the motor. Since the intake pump is an impeller pump
there are wearing parts which are likely to require replacement after a period of time. Ensure that the genset is
installed so that the intake pump can be easily accessed. If this is not possible, an external intake pump could be
installed in an easily accessible location
If the generator is installed above the waterline, it is possible that the impeller will wear out faster, because after
starting, the pump runs dry for some seconds. The raw water hose should form a loop as near as possible to the raw
water inlet of the generator (see picture below). This ensures the pump only sucks in air for a short time. The
impeller pump will be lubricated by raw water and the impeller life span will be increased.With the installation of a
non return valve in the raw water inlet line, which is under the waterline, this problem can be restricted.
When starting the generator you should always consider when raw water runs out of the exhaust system. If this
takes longer than 5 seconds you should replace the impeller pump because it sucks in air for too long before it
delivers raw water. The impeller has lost its effect and cannot suck in raw water anymore. This results to an
overheating of the motor. If the impeller is not exchanged early enough the impeller blades may break into pieces
and plugging the cooling water cycle. It is very important to exchange the impeller after a couple of months.
NOTE:If the raw water line is too long for the impeller pump or the
generator installed too high above the water line a electrical
pump can be installed into the raw water line. In this case the
impeller should be removed out of the impeller pump.
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