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Connection to boat's engine cooling system
Since all modern engines are cooled by a heat
exchanger with a coolant, it is convenient to use
the heated engine cooling water to feed the Water
Heater's coil (heat exchanger).
IMPOR TANT! Follow the engine manufac-
turer's instructions for the connection of the heat
exchanger. The following instructions should only
be used as a guideline.
For a better understanding of these instructions,
please refer to the "plumbing connection diagram"
at the back of this booklet. The Water Heater coil
should be connected by a by-pass into the engine
cooling circuit using flexible hose that can with-
stand the temperature of the engine's coolant.
1. A restrictor valve could be inserted into the
circuit (see plumbing connection diagram,
point 9) and set so that the total quantity of
coolant in the engine always remains the same.
2. With engines cooled with sea water, water
should be drawn at its hottest point after it has
passed through the engine. After it has passed
through the engine connect the coolant (or sea
water) to the Water Heater coil's entry pipe
fitting marked with a red rubber washer (see
plumbing connection diagram, point 4). We
would recommend fitting an escape valve,
between the pipe and pipe fitting, for the Water
Heater's heat exchanger system (see plumbing
connection diagram, point 5) which might be
useful during maintenance and emptying
operations.
3. Connect the Water Heater coil's exit pipe fitting,
marked with a blue rubber washer (see plumb-
ing connection diagram, point 3), to the coolant
on its return to the engine or, if the engine is
seawater cooled, before it is discharged over-
board. Ensure that the entry and exit pipe
fittings connected are those of the heat ex-
changer marked with the engine symbol illus-
trated below, and not those of the fresh water.
WARNING! The Water Heater must be
placed with its highest point below the expan-
sion tank to avoid air blocking of the circulation
of the cooling water.
To ensure a good production of hot water, the
temperature of the coolant circulating inside the
Water Heater coil should be above 50°C. The
volume of coolant contained inside Water Heater
coil is approximately the following:
QL 20 l Water Heater
QL 40/60 l Water Heater
IMPOR TANT! Make sure to add cooling
water to make up for the added volume in the
cooling system.
English
0.5 liters
0.8 liters
3
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