Electrical Connections - Indel Webasto Marine Compact Classic Instructions Pour L'installation Et L'utilisation

User Manual

8 Electrical Connections

The electronic unit is a double supply voltage device: this means that the same unit
can be used in both 12 Vdc and 24 Vdc systems. Maximum supply voltage is 17 Vdc
for a 12 Vdc system and 31.5 Vdc for a 24 Vdc system. Maximum environmental
temperature is 55°C. The electronic unit has a built-in protection which stops
compressor operation if its temperature is too high.
The electronic unit must always be directly connected to the battery or to the main
switch in compliance with + and - polarity and is protected against reversed polarity
connection. A fuse must be installed in the cable + as close as possible to the battery.
Pay special attention to the size of power cables. In the case of a 12 Vdc system (see
diagram), use a fuse sized for a current of at least 15 A. With 24 Vdc systems instead
7.5 A. If using a main switch, it must be sized so as to support a current of at least
20 A. For cable sizing, in addition to referring to CEI 20-40 "Handbook of electrical
cables with operating voltage up to 450/750 V", you can make use of Table 3 or Table
4, intending the distance between the battery or distribution panel and the electrical
unit as length.
In order connect the unit to the boat's electrical system, proceed as follows:
• Before turning on the appliance, check to make sure that the voltage of the
electrical system and/or battery complies with that which is indicated on the
unit's data plate.
• All electrical devices such as cables, connectors, alternators, regulators and
batteries should be maintained in accordance with regulatory guidelines.
• The same battery, having a capacity of at least 90 Ah, must permit the
accumulation of an appropriate amount of energy during motor operation.
• Always use cables with sufficient section (see recommendations in the
corresponding table).
• Always use copper or tinned multi-conductor wire, suitable for marine
environments.
• Connect the unit directly to the battery or to the relative main switch and
make sure that the system is equipped with an electric device that's capable of
protecting the circuit against possible overcurrents.
• Verify that the size of the main electrical system is enough to power all the units
connected to it.
• Avoid using any switches, plugs or junction boxes that are not strictly necessary.
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