4.3 Connections to engine (see connection
diagram, fi g. 1):
The water heater may be used with fresh water cooled
engines. The fl ow of cooling water from the engine
through the water heater should be at least 2 litres/min.
If the boat has two engines, connect the water heater to
one engine only. When two water heaters are mounted,
they shall be connected in parallel.
Connection to the engine shall be done with min. 5/
8” /16 mm hoses and adaptors to avoid restrictions.
See the instructions in the engine operators manual,
regarding hose connection points.
4.4 Freshwater connections (see connection
diagram, fi g 1):
The water heater is fed with fresh water from the
electrical pressure pump in the water system. Max
working pressure for the pump: 3.8 bar / 55 psi, 2.9 bar
/ 42 psi for Slim Square. Please note that the pressure
relief valve on the tank is set to 7.0 bar /100 psi and 5.5
bar / 80 psi respectively. Fresh water is taken in at the
safety valve. The hot water outlet, which also vents the
water heater, should be connected to a mixer tap at the
sink and/or basin outlet.
Warning!
Please note that the hot water is as hot as
the engine, there is a risk of scalding! Mix in cold water
at the taps. In case the water heater is equipped with a
tempering valve (thermostatic mixing valve) a proper
temperature of the warm
water can be set on the
adjustable tempering
valve to avoid scalding.
The temperature can be
set between 38 and 65 °C
/ 100 and 150 °F.
Wiring diagram
Fig. 8
000944US
The waste water hose must always have a free outlet.
There must be no valves or skin fi ttings, fi tted to the
waste water hose. This hose must always have a free
outlet. A small quantity of water can drain from the
relief valve when the tank is heated. The water expands
during heating. This is a normal situation and indicates
the system works properly.
4.5 Electrical connections
See wiring diagram fi g. 8
All internal connections are made in the factory. The
power supply cable is fi tted with an standard EU plug,
which should be fi tted to a correctly installed socket.
This socket, as all ”high-voltage” installations on board,
must be carried out by an authorized electrician to fulfi l
valid safety regulations. The water heater is designed
to meet regulations in this fi eld. The shore power
system installation on board, must include a ground
fault circuit interrupter.
When leaving the boat for longer periods, always
unplug the cable connector from the socket. This
should be done even if the shore power system is shut
off, as there can be a difference in the electrical system,
between the earth and the sea-water earth of the boat.
This can seriously damage the water heater or the
heating element.
Installation of a insulation transformer in the shore
power equipment eliminates any risk of galvanic
corrosion via the shore power connection.
Always unplug the heater and/or turn off all circuit
breakers and disconnect shore power connections
before removing the connection cover. The electrical
circuit is controlled by a service thermostat set to 75°C
/ 167°F and a double overheat protector that is set to
96°C / 205°F. If the overheat protector trip, it has to be
manually reset. This is done by pressing the small knob
on top of the overheat protector.
See section 6:2.
ENGINE
MOTOR
WATER
ENGINE
MOTOR
WATER
FRESH COLD
WATER IN
-
+
WARM
OUT
Temp.
Thermostat
mixing valve
514
½
"
Over heat thermostat Thermostat Heater element
L Black
Yellow
N White
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