Chapter 3 - Installation And Setup; Section 3-1 - Introduction; Section 3-2 - Two Wire And Four Wire Audio Modes - Wheelock SAFEPATH4 Application, Installation, Operation, And Maintenance Manual

Chapter 3 - Installation and Setup

Section 3-1 - Introduction

The lives of people depend upon your safe and proper installation of the voice evacuation system
and the Audio Booster Panel.
installation instructions set forth below to avoid damage to the panel and equipment connected to
it. Only qualified personnel in accordance with the procedures in this manual should conduct
installation.
WARNING: SHUT OFF ALL POWER BEFORE STARTING THE INSTALLATION.
ELECTRICAL SHOCK CAN CAUSE DEATH OR SERIOUS INJURY.
WARNING: DO NOT CONNECT AC POWER OR BATTERY BACKUP POWER UNTIL
SYSTEM WIRING HAS BEEN CONNECTED, MODULES HAVE BEEN INSTALLED, AND
FIELD WIRING HAS BEEN INSPECTED.
CAUTION: The printed circuit board is sensitive to static electricity and has delicate
components mounted on it. Before handling the board or any component on it, discharge any
static electricity from your body by touching a grounded object such as a metal screw, which is
connected to earth, ground. The panel is to be installed in a static free area and the user is to
properly attach grounded wrist straps before touching any static sensitive areas.
The installer, prior to installation should consult with the authorities having
jurisdiction (AHJ).
Section 3-2 – Two Wire and Four Wire Audio Modes
Modes
There are two modes of operation for the audio input. These modes are: Two Wire and Four
Wire. A maximum of 33 Audio Booster panels can be connected to an SP40/2 panel.
The Two Wire Audio Mode is used with the Wheelock, Inc. SP40/2 voice evacuation panel.
Supervision of the audio booster is performed over the same two wires used by the audio input
signal. If any one audio booster connected in the system goes into trouble, all secondary
operations (background music (BGM), telephone paging, and night ring) will disengage from all
audio boosters connected in the system. This method conserves battery backup power, if AC
power is lost. When an alarm message or a live voice message from the microphone is broadcast
by the SP40/2, the audio booster is amplifier section is energized and the message is broadcast.
Connecting 1 to 33 Audio Booster panels to an SP40/2 in the two wire mode is done by
connecting the audio returns (AUD RET) to the next audio input (AUD IN), and placing the UL
Listed 10K Ohm EOLR on the last AUD RET. Jumper W10 shall be installed. This is illustrated in
Figure 3-1.
Please read, understand and carefully follow the specific
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