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
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