Fermax PBX CAM, Руководство пользователя и инструкция по установке

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When installing the door phone panel in the environment where water
may be condensing (temperature changes) or where it may be raining on the
door phpje panel, we suggest to use the jumper on the main PCB board – turn
on the heating.
Main PCB board heating
has got two positive functions. Firstly it warms
up the electronics during winter when temperatures drop below -20°C (most
components have got guaranteed parameters for temperatures up to -20°C).
Secondly if you use the heating of the main PCB board, there are
no water
condensations
on the main PCB board in case the door phone panel is
installed outdoors. If the heating is used, we can guarantee correct
functionality. The heating protects the main PCB board against quick changes
in temperatures or when there is a higher humidity of air.