Installation Instruction
23.1.07
Panda_12mini_PMS_Digital_s00865_Installation manual.V02 - Chapter D: Installation Instruction Page 55
D.3 Cooling System Installation - Raw water
D.3.1 General References
The genset should have its own raw water (coolant water) inlet and should not be connected to
any other engine systems. Ensure that the following installation instructions are complied with:
Avoid galvanic corrosion
For the avoidance of galvanic corrosion the chapter "Service instruction for marine gensets (corro-
sion protection)“ is to be considered.
D.3.2 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 (i.e.
sea cock, thru-hull fitting, inlet filter, etc.) must have an inner diameter of at least 1" (25mm).
This applies also to installation components such as thru-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 pro-
ximity 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
take from Table 2, “Diameter of conduits,” on page V.
D.3.3 Installation above waterline
The Panda is equipped with a direct drive water intake pump mounted directly on the motor. Since
the intake pump is an impeller pump there are wearing parts which will likely require replacement
after some time. Ensure that the genset is installed such that the intake pump can be easily
accessed. If this is not possible, an external intake pump could be installed in an easily accessed
location.
If the generator is installed above the waterline it is possible that the impeller wearout will be
stronger. After the start the pump runs dry some seconds.
The raw water hose should describe a loop as near as possible to the raw water inlet of the gene-
rator (see picture below). With it the pump only sucks in air for a short time. The impeller will be
lubricated by the raw water and its life time will rise.
By the installation of a check valve in the raw water inlet line, which is under the waterline, this
problem can be limited a little .
It is very important to change the impeller every few month. When starting the generator you
should pay attention and listen when raw water comes out from the exhaust. If this lasts longer
than 5 seconds the impeller has to be changed, because he sucks to much air before raw water
reaches the impeller and the impeller wears out strongly. In this case the impeller looses its
function, which leads to an overheating of the engine.
If the impeller isn’t exchanged early enough, the impeller wings can break into pieces and clog the
cooling circuit. Therefore it is very important to change the impeller every few month.
NOTE:
Never change the impeller for many years, without exchanging the old pump. If the sealing ring is
defective within the pump, raw water runs into the sound cover of the genset. A repair is then very
expensive.
Replacement impeller and also a spare pump should always be on board. The old pump can be
sent back to ICEMASTER, where it is then economically overhauled completely.
Summary of Contents for Panda 12 mini PMS Digital
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