Bacharach GDC-150 Manual De Propietario

 

 

 

 

 

 

After installation, double check wiring prior to applying power to the GDC-150 
transmitter.  Remember, these are low voltage devices.  After power up, the  outer 
LED will flash green indicating the system is in a warm-up period.  During the warm-
up period, the signal output from the GDC-150 is fixed at 4.0 mA.  If the digital display 
option has been fitted, the LED display will indicate a scrolling decimal “…..” until the 
warm-up is completed.  If the relay option has been selected, the relay is not activated 
during  warm-up.  The  GDC-150  has been programmed with a 5-minute warm-up 
period.  After  the  warm-up  is completed, the signal output and digital display (if this 
option has been supplied) will indicate current gas readings (if any). 

 

If the relay option has been supplied, it will have a factory preset alarm set point (this 
can  easily be changed in the field).  In a non-alarm state, the outer LED will be 
illuminated green and the amber relay coil inner LED will be illuminated.  The 
illuminated relay coil LED indicates to the user that the relay coil is  energized.  The 
relay option on the GDC-150  has been designed to operate in a fail-safe manner, 
meaning that the relay coil is energized in non-gas-alarm state and de-energize when 
a gas alarm is indicated.  The device to be controlled should be connected to the N/C 
(normally closed) and COM  (common) terminals.  In the event of a sensor failure, 
anything controlled by the relay is activated continuously until the fail condition has 
been corrected.