Switches - Alphatech Brave series User And Service Manual

2.1.4 Switches

8. The switch marked HEAT (see figure –
8) activates heating of the PCB. This is
for increased
humidity. To use this feature you must
connect an external 12V power supply.
9. The switch marked SERVICE (see figure
– 9) is required for programming the unit
when the password is forgotten. It is
performed by ordinary phone (DTMF –
tone dial ).
The switch is
The PCB heating has two major benefits. Firstly, it warms the board during
winter time (temperatures under -20 C, most circuits have warranty operation
down to -20 C) and secondly it helps to protect the PCB against humidity when
installed outside.
Note: Door entry system Brave SlimDP is designed in such a way that it is
possible to connect 10-18V AC or 12-24V DC to the terminals 12V (polarity is
unimportant).
resistors won't burn out at a higher voltage.
12
resistance
The motherboard heating system has a regulator so that
BRAVE SlimDP –
against
User and service manual