4: Speaker Volume Control - Honeywell NOTIFIER NFC-50/100 Instruction Manual

Output Circuits
2.6.4 Speaker Volume Control
Speaker Volume Control requires use of the Cooper Wheelock SP-SVC module. The Supervised Volume Control (SP-SVC) allows man-
ual volume setting for telephone paging and background music for a specific speaker or speaker zone. The selected adjustment will not
affect the volume setting of emergency prerecorded messages or live microphone usage. Refer to the Cooper Wheelock Safepath SP-SVC
Installation Instructions (P/N: P84598) for more information.
Notes:
1. Only one (1) SP-SVC can be installed per audio zone; however, multiple speakers can be controlled by the same speaker volume
control override output.
2. All fixed volume speakers must be placed before the SP-SVC in the speaker circuit. Any speakers placed after the SP-SVC module
will be able to be attenuated.
3. An end-of-line resistor (ELR) must be installed on the last speaker connected to the SP-SVC.
4. Attach wires according to the label on the terminal block. The DC input/output terminals are interchangeable. If the SP-SVC is the
last unit in the Speaker Volume Control Override circuit, then an ELR must be installed.
5. The maximum wire impedance between devices must not exceed 35 ohms.
Notifier FirstCommand Series Manual — P/N LS10001-001NF-E:H 1/8/2018
SP-SVC terminal layout
4.7K, 1/2W ELR
P/N: 71252
+ -
TB23 on NFCECS-
50/100 main control
board
Figure 2.18 Speaker Volume Control Wiring
}
From preceding volume control module
or override output (on main board)
}
To next volume control module or ELR
}
From audio output or preceding
speaker (fixed volume)
}
To next speaker (variable volume)
5
4
3
2
1
0
SP-SVC
Variable Volume
Speakers
+
-
Fixed Volume Speakers
+
-
6
7
8
9
10
15K, 1W ELR
P/N: ELR-15K
}
From Speaker
Circuit Output
Installation
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