22
Field Wiring Supervised Hardwired Alarm Zones
The Keltron S/FDACT provides connections for four supervised hardwired alarm zone inputs. These
inputs operate as Class B (programmable) normally open dry contact zone inputs. Initiating devices,
typically dry contact outputs of FACP control circuits, must have a 10 KOhm end-of-line resistor (EOLR)
installed in parallel at the monitored device. Four EOLRs are provided for this purpose, Keltron part
number 64K3355-10K.
Connections to the alarm zones are as shown above. Input zones are sampled every 62mS. Changes must
be present for 8 consecutive samples to pass debounce. This gives each zone a 500mS response time.
IMPORTANT:
The hardwired alarm zones are the primary means of alarm signaling via Keltron’s
SDACT and FDACT dialers. Use of the alarm zone inputs is required for UL Listed installations
monitoring FACP’S for Remote Station, Central Station, and Proprietary service.
