Cooling - Sea Water Inlet System; Calorifier Connections (If Fitted); Calorifier System - Beta Marine Beta 43 Operator's Maintenance Manual

Seawater Inlet System (Heat exchanger Cooled Engines)
Your engine is fitted with a gear driven sea water pump which
sucks in seawater (raw water) to cool the closed circuit system
via the heat exchanger.
1. It is very important that the seawater inlet should have
a strainer system either built into the sea cock or a high level
system with visual inspection glass (as shown) mounted just
above the water line.
2. The inlet sea cock and pipe work to the sea water pump
should be 25 mm ID or 1" minimum.
8

Calorifier System

All Beta engines can be fitted with the calorifier connections to allow the hot water from the closed fresh water / antifreeze system to
circulate through a calorifier tank, which in turn heats up domestic water. Calorifier connections on this range of engine are shown.
1. The big problem with a calorifier is to remove all the air from
the system. If this is not achieved then they don't work!
2. Try and keep the supply and return pipes either horizontal or
sloping down in a continuous fall towards the calorifier. This
avoids air pockets being created.
3. Extra care must be taken when first filling the calorifier circuit
system with 50% antifreeze to water solution as the engine
may appear to be full but it soon disappears into the calorifier
pipe work. Run the engine off load for 10 minutes then check
the level as described in 'Filling The Fresh Water System'.
Also check to see if the pipe going to the calorifier is getting
warm.
9
Calorifier
supply
3. Good access to the inlet sea cock is essential so that plastic
bags or seaweed trapped in the intake can be poked out.
4. All pipe work should have approved marine grade stainless
steel hose clips. Any loose clamps or bad connections can
cause flooding and sinking of the vessel
5. If water is required for stern tube lubrication then this should
be taken from a 'T' piece in the pipe going from the heat
exchanger outlet to the water injection bend.
6. Scoop type water pickups should never be used, as water will
be forced through the pump and into the exhaust system
whilst the vessel is sailing. This is very dangerous as the
exhaust will eventually fill and sea/raw water will back up into
the engine through the exhaust valve. Catastrophic failure will
Water Level
Top up the water level as required and run for another
ten minutes then repeat.
4. If the water level is steady but no warm water is getting to the
Calorifier (then with engine stopped) very carefully remove the
pressure/filter cap using a large rag/cloth to protect you hand
from scalding. Now very carefully open the Calorifier bleed
valve (see manufacturers instructions) or if none is provided
then very carefully loosen the jubilee clip securing the supply
pipe to the Calorifier. Air should escape. Refasten securely
when no further bubbles are seen.
Caution: Do not do this when the engine is hot as scalding
hot water may be forced out of the pipe.
10
Calorifier
return
9
result as soon as the engine is
restarted. Note: The maximum
lift of the sea water pump is 2m
when primed.