Support

All preheaters:

• The preheater is installed in the engine compartment.
• The preheater is integrated into the coolant return line from the internal heat exchanger to the engine.
• Alternatively in the by-pass system, if a valve has to be bypassed. For details, see the sketch, see the bottom section of the Support page.
• Further questions are answered in the document "Frequently Asked Questions".

OWL: 1S + 2S

• The connection cable (black) is routed from the engine preheater, eg to the vehicle front or sideways (fog lights).
• The plug-in socket can be fixed in two different ways (fastening bracket downwards, or forward, see pictures in the offer).
• For details on the mounting of the socket, please refer to the document "Mounting socket".
• With the orange cable, the Schuko socket is connected to the socket on the vehicle front.
• No additional fixing of the heater (380Gram) is required
• Further questions are answered in the document "Frequently Asked Questions".

OWL: 4S

• The connection cable should be placed in the interior, since it is not protected 100% against weather influences.
• The heater should be screwed to the body by means of the metal plate attached to the rear panel.
• Further questions are answered in the document "Frequently Asked Questions".

OWL: 4D

• The connection of a connection set DEFA is required
• The heater should be screwed to the body by means of the metal plate attached to the rear panel.
• Further questions are answered in the document "Frequently Asked Questions".

Related files

Installation instructions / Quick guide for download as PDF:
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OWL-1S	OWL-2S	OWL-4S + D	Quick guide with pictures	frequently asked Questions	Mounting socket
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The installation as a by-pass system, between flow and return, is only necessary if, for example, a valve hinders circulation.