Harrington Signal HS-3200 - Install Manual - Manual (Page 24)

HS-3100/3200 Installation Manual
18
Notification Appliance Circuit Connections
Class B (Style Y) NAC
This is a 2-wire Class B (Style Y) supervised signaling (notification appliance) circuit. Devices and
the 10k ohm end-of-line resister will be connected as indicated in the figure below. Maximum wire
lengths are shown in the Appendix. Use only approved devices.
Note:The appliances must incorporate a steering diode or other means of providing activation with
the alarm state and no current with the supervision state.
Class A (Style Z) Bell Circuit
This is a 4-wire Style Z (Class A) supervised signaling (notification appliance) circuit. Devices will
be connected as indicated in the diagram below. Maximum wire lengths are shown in the
Appendix. Distances noted therein account for the total length of wire, from the panel to furthest
device and back to the panel. Use only approved devices. Return wiring must be in a separate
conduit. The EOL is on the board for Class A applications.
Function Relay Circuit Connections
Form C programmable relays can only be connected to a Power Limited source limited to 2A @
30VDC. They have a power factor of 0.35.
10kΩ
EOLR
NAC2
MDR-EOL-10k
A+ A- B+ B- A+ A- B+ B-
NAC1
Circuit is supervised 24V FWR
power limited 2.0A MAX.
Figure 8: Class B NAC Wiring
NAC2
NAC1
A+ A- B+ B- A+ A- B+ B-
Circuit is supervised 24V FWR
power limited 2.0A MAX.
Figure 9: Class A NAC Wiring
Figure 10: Function Relay Wiring