24
Bell (Notification Appliance) Circuits
Number & Type
8 Class B, NFPA Style Y/ Class A, NFPA Style Z
Supervisory Current
1.0 mA, power limited
Alarm Current
1.5 A, power limited (NAC/1.0 A, power limited, Releasing)
Voltage
24 VDC, nominal, full wave rectified, unfiltered
End of Line Device
Class B (Style Y) only: 10 K
Ω
Resistor, EOL-103
System Relays (3)
Type
Form C, one each for Alarm, Supervisory and Trouble
Rating
0.5 A @ 30VAC (resistive) / 1.0A @ 24VDC
General Purpose Relays (4)
Type
Form C
Rating
0.6A @ 30VAC (resistive) / 2.0A @ 30VDC
Auxiliary Power Outputs (2)
Voltage
24 VDC
Ripple Voltage
2 Vrms, maximum
Current
135 mA per circuit, power limited
MR-2910 Network Communication Boards
MR-2910
Network Communication Module, Both Ports Standard
MR-2910-R1
Network Communication Module, Port 1 RS-232, Port 2 Standard
MR-2910-R2
Network Communication Module, Port 1 Standard, Port 2 RS-232
MR-2910-R12
Network Communication Module, Both Ports RS-232
*Using 22 AWG wire.
Battery Boxes
Note:
Consult Appendix C UL Listed Compatible Devices
Note:
These relays are not listed by UL for use for connection to equipment outside the same room as
the Control Panel.
Notes:
• Consult Appendix C UL Listed Compatible Devices
• If load exceed 135mA, any NAC output circuit can be programmed as Aux power to provide up to
1.5 A.
Standard
RS-232
Wire Type
Twisted Pair
Twisted Pair
Gauge
18-22 AWG
18-22 AWG
Distance
*10 km (apr. 6 miles)
Under 6m (20 ft)
Application
Direct Wire
Fiber Optic Modem
Model
Capacity
Size
MR-2978B
24-52 Ah
21" x 9" x 7" white
MR-2978R
24-52 Ah
21" x 9" x 7" red
