Eberspächer Hydronic D4 Installation Manual - page 18
Electrical System
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Electrical System
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The electrical system comprises of a heater cable
harness and individual looms for the power supply,
operating device and the fuel-metering pump (where
necessary). Also a fuse box assembly and the operating
device you have selected are included.
The individual looms can be routed as one or in separate
directions as required (depending on the layout of the
boat, the location of the batteries and fuel-metering
pump, etc.).
Positioning and connecting the operating device
The operating device should be located inside the boat in
an area where it is easily visible and accessible. This is
especially important if a timer, or where any other device
with a programmable display, has been specified.
Operating devices with integral temperature sensors and
temperature sensor units should not be located where
they can be adversely affected by direct sunlight or
drafts. Additionally, locating the units near to boat fixtures
such as cookers, or lighting that can emit heat, should be
avoided.
A common position for the operating device is to
locate it nearby to other instrumentation on the boat,
in an area such as the chart table/instrument panel.
Additional information regarding fastening and operating
instructions is supplied with the operating device.
Connecting to the power supply
The preferred point of connection is the boat’s main
battery isolator, using the fuse assembly supplied.
It should be connected so that when the isolator is
switched off, the heater cannot be used.
However, if a remote operating device such as a timer or
Calltronic is to be used, then the heater will need to be
wired to the battery (permanently live) side of the isolator
so that when the isolator is switched off, the heater can
still be operated.
!
Caution!
Connecting to a permanent supply!
• If a permanent supply is required, an additional
isolator or circuit breaker may be required, dependant
on the legislation of the country.
• Check with the boat marina and your marine
insurance policy to see if the heater can be operated
when the boat is unattended.
• Ensure only the specified fuse ratings are used.
Heater wiring
!
Caution!
Safety instructions for wiring the heater!
The heater is to be connected up electrically according
to the EMC directives.
EMC can be affected if the heater is not connected
up correctly. For this reason, comply with the following
instructions:
• Ensure that the insulation of electrical cables is
not damaged. Avoid: chafing, kinking, jamming or
exposure to heat.
• In waterproof connectors, seal any connector
chambers not in use with filler plugs to ensure they
are dirt-proof and water-proof.
• Electrical connections and ground connections must
be free of corrosion and firmly connected.
• Lubricate connections and ground connections
outside the heater interior with contact grease.
Please Note!
Comply with the following when wiring the heater and the
control element:
• Electrical leads, switchgear and controllers must
be arranged in the boat so that they can function
perfectly under normal operating conditions
(e.g. heat exposure, moisture etc.).
• The following cable cross sections are to be used
between the battery and heater. This ensures that
the max. tolerable voltage loss in the cables does not
exceed 0.5 V for 12 V or 1 V for 24 V rated voltage.
Cable cross sections for a cable length of:
– up to 5 m (plus cable + minus cable) =
cable cross section 4 mm
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– from 5 to 8 m (plus cable + minus cable) =
cable cross section 6 mm
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• If the plus cable is to be connected to the fuse box,
the boat cable from the battery to the fuse box must
be included in rating the overall cable length and
possibly re-dimensioned if necessary.
• Insulate unused cable ends.
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