6 en | Operation Notification Appliance Circuit Module
2020.05 | 04 | 4998122260 Installation manual Bosch Security Systems, Inc.
3 Operation
During normal operation, the NAC loop is supervised for opens, shorts, and ground faults. If
any of these conditions is detected, the control panel indicates a trouble condition at the
command center. Program the control panel to report the condition to the central station.
(See
Programming, page 18
.)
When the control panel detects an alarm, the alarm output circuit triggers the module to
supply circuit power to the NAC devices.
When testing the alarm panel, the module uses a toggle switch to silence the fire alarm
indicating devices. When the toggle switch is in Silence Mode (off), the module indicates a
supervisory trouble condition to the control panel and the yellow SUPERVISION TROUBLE LED
lights.
The following table indicates possible causes for the various LED indicator patterns:
Indicator Possible cause
SUPERVISION TROUBLE LED (yellow) is on. – Output loop or 560Ω EOL resistor is
open or missing.
– Alarm switch is in SILENCE (OFF)
position.
SUPERVISION TROUBLE LED and ALARM LED
(red) are off.
– Normal operation with no alarm or
trouble.
– No power. Check for voltage across the
External Power In and Common
terminals. If the external voltage is not
connected, the control panel reports a
trouble condition locally and to the
central station (if connected).
– The wire to the Common terminal is
open or missing. If Common is not
connected, the control panel reports two
trouble conditions locally and to the
central station (if connected).
ALARM LED is on. There is an alarm. The LED follows the
operation of the output relay when the Alarm
switch is in the ON (NORMAL) position.
SUPERVISION TROUBLE and ALARM LEDs are
on.
If the Alarm switch is in the SILENCE (OFF)
position and the module is in alarm, both the
SUPERVISION TROUBLE and ALARM LEDs
light.
Tab.3.1: LED operation and troubleshooting
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