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Connect an External Alarm Sounder
The terminal block inside the GC3 Panel includes two (2) solid-state bell terminals (BELL+/BELL-) for an external alarm
sounder. An external alarm sounder is typically housed outside of a property, in a location that will attract the most
attention, in order to scare unwanted intruders away with an audible alarm (and sometimes also a strobe light). When
choosing a location for the sounder, ensure it is protected from harsh weather (either housed indoors or in a weatherproof
box). It should also be mounted in a location where the siren can be easily heard by occupants.
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If you are installing a new external sounder:
First, install the external sounder in the desired location. Then
route the wiring to the GC3 Panel’s terminal block.
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If you are replacing an existing external sounder:
First, install the replacement sounder in the desired location.
Then route the wiring to the GC3 Panel’s terminal block.
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If an external sounder is already installed:
First, disconnect power to the external sounder. Then route the
sounder’s existing wiring to the GC3 Panel’s terminal block.
IMPORTANT:
The GC3 Panel is designed to connect to Solid-State Relay sounders only. To avoid damage to
the output, do NOT connect an Electromechanical Relay bell to the BELL+ or BELL- position on the GC3 Panel’s
terminal block. In addition, bell output is only provided when the GC3 Panel’s power supply is connected to an AC
power source.
To connect an external alarm sounder to the GC3 Panel:
1. Install the sounder in a secure, weatherproof location where it can be easily heard.
2. Disconnect the sounder from its power source.
3. Ensure the GC3 Panel is disconnected from both the AC power source and the backup battery.
4. Route the wiring from the sounder through the back of the GC3 Panel’s wiring cutout.
5. Connect the sounder’s wires to the BELL+ and BELL- positions on the GC3 Panel’s terminal block.
NOTE:
For sounders with low current consumption, low current relays, or in the event that the Piezo Sounder
produces a humming sound or noise, install an 820
Ω
resistor in parallel with the sounder.
Wiring Diagram—Bell Output
TIP:
After the installation is complete, navigate to
the
Panel Programming
menu to con
fi
gure siren
supervision. This lets the system notify both the user
and the Central Station if the wire between the external
alarm sounder and GC3 Panel is cut. By default, this
setting is turned OFF. See “Q28: Siren supervision time.”