Alphatech Fermax PBX EXP Guia de Instalação descarregar pdf (Página 19)

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.

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Alphatech Fermax PBX EXP Guia de Instalação Página 19