12
BRAVE SlimDP
–
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
resistance
against
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). The motherboard heating system has a regulator so that
resistors won’t burn out at a higher voltage.