© 2017 United Technologies Corporation 1 / 2 P/N 3102073-EN • REV 005 • ISS 22SEP17
GSA-T3T4 Temporal Pattern
Generator Installation Sheet
Description
The model GSA-T3T4 Temporal Pattern Generator is an addressable
device that generates sound patterns for fire or carbon monoxide (CO)
alarms for compatible audible (sounder) bases. Table 1 and Figure 1
below show the pattern characteristics.
Table 1: Temporal patterns
Description of pattern per cycle
0.5 s on, 0.5 s off, 0.5 s on, 0.5 s off,
0.5 s on, 1.5 s off
0.1 s on, 0.1 s off, 0.1 s on, 0.1 s off,
0.1 s on, 0.1 s off, 0.1 s on, 5.1 s off
Figure 1: Temporal pattern wavelengths
The GSA-T3T4 module uses two addresses on the signaling line
circuit (SLC). Address 1 is tied to Channel 1; Address 2 is tied to
Channel 2. Channel 1 always has the highest priority.
Channel selection
The control panel sends synchronization and channel commands to
the GSA-T3T4. Channel selection determines the pattern. The control
panel can also send silencing commands to the GSA-T3T4.
During system initialization, the SLC controller determines which
pattern plays on each channel, depending on the marketplace setting.
For example, in the US and Canadian marketplaces, a fire alarm takes
priority over a CO alarm, so the TC3 pattern is assigned to Channel 1.
Settings for other markets are governed by local requirements.
Synchronization
When an alarm condition occurs, the detector notifies the panel and
the panel commands the GSA-T3T4 to activate the T3T4 riser. The
GSA-T3T4 generates the appropriate pattern and synchronizes all the
audible bases on a single SLC. The SLC controller synchronizes
multiple GSA-T3T4s installed on the same SLC.
Silencing the GSA-T3T4
The alarm signal continues until the system resets or is manually
silenced. The GSA-T3T4 can receive silencing commands from the
control panel.
LEDs
Diagnostic LEDs provide visible indication of the status of the module
through the cover plate:
•Normal: green LED flashes
•Alarm/active: red LED flashes
Personality code
The default personality code is 70, Unsupervised Relay Output. This
configures the GSA-T3T4 to select the desired sound pattern based on
the activated channel.
Installation
Install this device in accordance with the latest editions of
CAN/CSA-6.19, CAN/ULC-S524, CSA C22.1, NFPA 72, NPFA 720,
and the local authority having jurisdiction.
Caution: Electrical supervision requires the wire run to be broken at
each terminal. Do not loop the signaling circuit field wires around the
terminals.
Notes
•The GSA-T3T4 Temporal Pattern Generator is shipped from the
factory as an assembled unit; it contains no user-serviceable parts
and should not be disassembled.
•Only one module is required for each T3T4 riser.
•When determining allowable wire resistance, refer to the voltage
rating of the module, the signaling appliance, and the control panel
specifications.
•Wire in accordance with NFPA 70 National Electrical Code or
CSA C22.1 Canadian Electrical Code.
•Each terminal on the GSA-T3T4 module is limited to a single
conductor.
•Strip 1/4 in. (about 6 mm) from the ends of all wires that connect to
the terminal block of the module. Exposing more bare wire may
cause a ground fault and exposing less wire may result in a faulty
connection.
To install the module:
1. Verify that all field wiring is free of opens, shorts, and ground
faults.
2. Make the wiring connections as shown in Figure 3.
3. Install the module as shown in Figure 2. See “Specifications” on
page 2 for compatible electrical boxes.
Figure 2: Mounting in a single-gang box
(1) Compatible electrical box
(2) GSA-T3T4
(3) Wall plate
(4) #6-32 × 1/2 screws
(5) #4-24 × 1/2 screw
