SilentKnight 5104 Digital Alarm Communicator Transmitter 6 Zone - Manual (Page 19)

Installation 151053-L8
3-11
3.10 Detector Installation
3.10.1 Class A (Style D) Zones
Zones 1 is for a class A (style D) zone. It is intended for use with non-powered devices such as waterflow
switches. Do NOT use smoke or duct detectors on Class A zones.
Each class A zone is a four-wire circuit that allows an alarm to be detected even after a single open or ground
fault occurs. When a single open or ground fault occurs, the audible trouble signal will sound and the 5104 will
report the trouble to the central station.
Figure 3-6 shows how to wire a class A (style D) loop. No end-of-line (EOL) resistor is needed for this zone.
This zone must be wired using normally open contacts.
Figure 3-6 Class A (style D) Supervised Fire Loop
(Normally Open Sensors Only)
Note: Class A wiring is to be used for dry contacts only and does not support 2-wire detectors.