BlueCool S-Series 11
Notes
■
The sea water inlet must be arranged at the lowest
possible point below the water line and below the
sea water pump.
■
The through-hull fitting for the sea water inlet
must be installed with the opening facing in direc-
tion of travel in order to create a boosting back-
pressure in the intake line.
■
Sailboats: install the through-hull fitting near the
centre of the hull.
■
Fast motor boats: install through-hull fitting in rear
section of hull.
The sea valve on the through-hull fitting is used for safety and
maintenance purposes.
Install through-hull fitting, seal off with sealant and check for
leak-tight seating.
5.7.2 Installing sea water pump
Notes
■
We recommend installing the sea water pump at
least 0.25 m below the water line.
■
If installation below the water line is not possible,
a self-priming pump must be used.
Selecting sea water pump
To increase the operating safety, we recommend the use of
self-priming pumps. These are significantly less susceptible to air
accumulations, which can enter the system during reverse travel
or when in a tilted position, for example.
Parallel connection of several BlueCool S-Series systems supplied
via one sea water pump and one sea water inlet is possible. How-
ever, the maximum number should be limited to four
BlueCool S-Series systems.
Each system requires a separate sea water outlet to check the re-
spective minimum flow rate and to enable an operating check of
the systems.
If necessary, throttles that reduce the cross section should be
used to adjust the flow rates.
A water manifold and pump relay must be fitted if one sea water
pump is supplying several BlueCool S-Series. Refer to Chapter
“14.3.7 Wiring diagram , several systems with one sea water
pump” on page 42.
A shut-off valve must also be provided for each air conditioning
unit.
Self-priming sea water pumps
If a self-priming pump is installed above the water line, the pump
head must be pre-filled during initial start-up or after longer times
at standstill to enable self-priming.
Pump characteristics
The pump characteristics enable the selection and dimensioning of
the sea water pump depending on expected pressure losses in the
entire system.
Operating the pumps outside the pump characteristic can damage
the pumps due to motor overloading or cavitation. Damage which
occurs due to improper operation is excluded from the warranty.
The delivery head of a pump is often specified in metres water col-
umn and represents the pressure drop between the pump inlet
and outlet. This pressure drop corresponds to the total pressure
differential in the sea water system from the sea water inlet up to
the sea water outlet.
The effective water flow through the pump and therefore through
the sea water system changes considerably depending on the
pressure drop.
The minimum sea water flow rate through the air-conditioning
system must be maintained at all times. This should be checked
every time the system is placed into operation.
Installation
Notes
■
Make sure that the pump is accessible for mainte-
nance work.
■
It is urgently recommended that a vent be installed
directly behind the outlet opening of the sea water
pump to allow the collected air bubble to escape
when the system is started up.
Install the sea water pump.
SeeFig.7
5.7.3 Installing sea water strainer
Notes
■
Match the size of the sea water strainer to the sea
water quality. If a great deal of dirt is to be expect-
ed, then a strainer of the corresponding size
should be chosen.
■
The sea water strainer must be installed between
the through-hull fitting and the sea water pump.
■
Comply with specified direction of flow.
■
Make sure that the sea water strainer is accessible
for maintenance work.
Install the sea water strainer in accordance with the manufac-
turer's specifications.
5.7.4 Installing sea water outlet
Notes
■
The sea water outlet must be installed approx.
0.10 m above the water line.
■
At least the first 150 mm of the sea water outlet
line within the interior of the boat should be
self-emptying to prevent breakage caused by
freezing.
■
Do not install the sea water outlet in the bow area
of the ship to prevent back flow.
The sea water outlet may not be mounted below the waterline.
Although this leads to a reduction in the operating noise of the
sea water outlet, it increases the counterpressure in the system
and significantly lowers the flow rate and thus the system capaci-
ty. Then a simple test of the flow rate is no longer possible.
Each BlueCool S-Series self-contained air-conditioning unit re-
quires a separate sea water outlet to be able to check and secure
the minimum required sea water flow rate.
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