Eberspächer Hydronic D4 Installation Manual - page 12
Water pipework
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1
Exhaust and Combustion air system
13
1
The majority of boats will probably have a calorifier
already installed, which is usually connected to the
engine and/or a mains AC supply.
If the existing single coil calorifier is used with the
Hydronic heater, it is strongly recommended that the
engine is disconnected from the calorifier. Suitable
blanking fittings will be required - contact engine
manufacturer.
The use of a twin coil calorifier will allow the engine and
Hydronic heater to independently heat the domestic hot
water.
!
Danger!
Risk of burning and injuries!
• The calorifier must be fitted with a device such as a
blender/thermostatic valve to limit the temperature of
the water that can be used for washing, bathing, etc.
to a safe temperature.
Connecting into and engine circuit
It is not generally considered advisable to maintain a
static engine at its operating temperature for long periods
of time. This is because lubricating oils can drain from
the upper parts of the engine, causing increased friction
and therefore increased mechanical wear upon starting.
In connecting the heating system to the engine, it will
increase the water content of the coolant system which
increases the volume of water that expands as the
coolant rises in temperature. The expansion/header tank
fitted to the engine may not be able to accommodate
such expansion.
Additionally, the engine expansion/header tank may need
re-siting to ensure it is the highest component of the
combined circuit.
For this reason, caution is advised if considering
incorporating the boat engine into the heating/hot water
circuit and advice should be taken from the engine/boat
manufacturer before commencing. The terms of your
boat /engine warranties may also be affected by such
modifications.
3
!
Danger!
Risk of burning and injuries!
• The water pipework must be routed and fastened in
such a way that there is no risk to people, animals
or materials that are sensitive to temperature from
radiation or contact or blown hot air from matrx units.
• If necessary cover or protect exposed pipe work or
deflect hot air from any matrix that poses a potential
risk.
• High temperatures occur during and after heater
operation. Avoid working in the heater vicinity while
it is in operation. Switch the heater off and allow it to
cool before commencing work. Wear safety gloves if
necessary.
• The heater system pipework must not be connected
to the engine circuit in any way that would allow
coolant from the heating system to be released
when the engine coolant pressure cap is removed.
i.e. All the heater system water components must
be installed below the level of the engine coolant
pressure cap.
!
Caution!
• The heater air intake must not be positioned in such
a way that any exhaust gases can be drawn directly
into the heater under normal circumstances.
• Fan matrix units must not be located in areas that
can allow fumes, gases etc to be drawn into the
accommodation area.
• In the event of overheating, the heater or exposed
pipework surface temperatures can reach 100°C.
Only use the temperature resistant water hoses of the
correct specification.