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Model 4720 Control/Communicator Installation Manual (P/N 150476, Rev. A) Revised 10/98
33
Figure 9.2a: ESL 445AT Smoke Detector Wiring
9.3 Model 7181 Fire Zone Converter
The Model 7181 Fire Zone Converter allows you to connect style A (formerly class B) sensors to the Model
4720's style D (formerly class A) zones, to connect style D sensors to the Model 4720's style A zones, and
to connect 2-wire smoke detectors to the Model 4720's 4-wire zones. For installation information, see the
Model 7181 Installation Manual (P/N 150632).
10 Local Annunciation
10.1 Fire Bell Wiring with the Model 4160 Supervised Bell Module
The Model 4160 Supervised Bell Module is required for Local Fire Alarm (NFPA 72 Local Protective
Signaling Systems, UL 864) installations. You MUST use a Wheelock 46T.G10 Polarized Bell with this
module. Follow the directions below to install the Model 4160.
Note: The Wheelock Model 46T.G10 will provide 85 dB at 10 feet.
1. Attach a 15-kΩ end-of-line (EOL) resistor (Model 7630) across the coil of the last bell in the loop.
2. Wire the negative (–) side of the bell(s) to Terminal 4 of the Model 4160.
3. Wire the positive (+) side of the bell(s) to Terminal 3 of the Model 4160.
4. If the board has a shunt block, move it to the left (“out”) position. If there is no shunt block, cut jumper
J1 on the Model 4720 control panel.
5. Connect Terminal 7 of the Model 4720 to Terminal 2 of the Model 4160.
6. Connect Terminal 5 of the Model 4720 to Terminal 5 of the Model 4160.
7. Connect Terminal 6 of the Model 4720 to Terminal 6 of the Model 4160.
8. Connect Terminal 1 of the Model 4160 to any unused zone of the Model 4720.
Note: The zone must be programmed as normally open, 24-hr. Supervised. This zone MAY NOT be used as an
alarm input.
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