Unit installation

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