4901 TrueAlert
®
Non-Addressable Horn
Installation Instructions
CAUTION: When switch SW1 is in the
SmartSync mode, the horn will not
operate unless connected to a
SmartSync control module (4905-
9938), 4010 fire alarm control panel,
or 4009 IDNet NAC extender. The
factory default setting for SW1 is
“OFF.”
Cautions and Warnings
READ AND SAVE THESE INSTRUCTIONS- Follow the instructions in this installation manual. These
instructions must be followed to avoid damage to this product and associated equipment. Product operation
and reliability depend upon proper installation.
DO NOT INSTALL ANY SIMPLEX
®
PRODUCT THAT APPEARS DAMAGED- Upon unpacking your
Simplex product, inspect the contents of the carton for shipping damage. If damage is apparent, immediately
file a claim with the carrier and notify an authorized Simplex product supplier.
ELECTRICAL HAZARD- Disconnect electrical field power when making any internal adjustments or repairs.
All repairs should be performed by a representative or authorized agent of your local Simplex product
supplier.
STATIC HAZARD- Static electricity can damage components. Handle as follows:
• Ground yourself before opening or installing components.
• Prior to installation, keep components wrapped in anti-static material at all times.
FCC RULES AND REGULATIONS – PART 15- This equipment has been tested and was found to comply with the limits
for a Class A digital device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.
SAFETY OF NOTIFICATION APPLIANCES - Always install, maintain, and test notification appliances within their
specifications. Failure to follow all safety precautions and instructions may result in loss of life and property due to non-
functioning notification appliances.
Some notification appliances use high voltage. To avoid electrical hazards and damage to appliances, make sure that the electrical
power for the notification appliance circuit is disconnected at the control panel. Disconnect before installing, repairing, or internally
adjusting any notification appliances.
Even with electrical power removed, some notification appliances store a high voltage charge. This high voltage can cause injury
resulting in death from electrical shock. DO NOT TOUCH EXPOSED CIRCUITRY.
The 4901-6820 and 4901-9820 TrueAlert horn (see Figure 1) is
a non-addressable wall-mounted notification appliance that
provides an audible indication of an alarm condition. It is
activated from the control panel of a UL-listed, Simplex fire
alarm system. When the notification appliance emits sound,
it indicates the possibility of an emergency situation that
requires your immediate attention.
The horn is a notification appliance that operates on a reverse
polarity notification appliance circuit (NAC). When this NAC
circuit is in the reverse polarity, or supervision state, the horn
does not operate, and introduces high impedance to the circuit.
The horn operates when the NAC changes polarity, to enter the
“alarm” state.
When the horn powers up, it checks the setting of the Switch
(SW1) to determine whether to operate in either Free-Run
(SW1 “OFF”) or SmartSync
(SW1 “ON”) Mode. If the
switch is set for Free-Run mode, the horn sounds for as long
as power is applied. Otherwise, the horn waits in silence for
commands from the NAC.
When set for SmartSync mode, the horn responds to Turn-
ON, Turn-OFF, March Time, and Temporal command
signals received from the SmartSync circuit. The horn
responds immediately on any valid command received to reset the sounder operation to the new mode. The horn will
produce an audible, ½ second pulse every 1.0 second when either March Time or Temporal command is detected, with
every fourth pulse removed, under the Temporal (Code 3) command. See Table 1 for information about sound output
levels and current draw on the TrueAlert horn.
TrueAlert
Non-
Addressable
Horn
© 2005-2015 Tyco Fire Protection Products. All rights reserved. All specifications and other information shown were current as of document revision date and are subject to change without
notice.
Tyco, Simplex, and the product names listed in this material are marks and/or registered marks. Unauthorized use is strictly prohibited.
574-720
Rev. G
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