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Features 

 

Provides Temporal Code 4 (TC4) NAC (Notification 
Appliance Circuit) control for Carbon Monoxide 
(CO) gas warning: 

 

The TC4 CO gas warning is a repeated sequence of four 
cycles of 100 msec on with 100 msec off, followed by 
5 seconds off per NFPA 720, 

Standard for the 

Installation of Carbon Monoxide (CO) Warning 
Equipment in Dwelling Units

 

 

Compatible appliances includes: CO Sounder Base 
4098-9798, 4901-9820 Horn (set for free-run), and 4903 
Series 4-wire A/V appliances horn input (

not compatible 

with SmartSync horn control appliances

Compatible Simplex

®

 equipment NAC sources: 

 

4100ES, 4100U, or 4010ES NAC outputs  

 

4009 IDNet NAC Extender NAC outputs 

 

Each module requires an input NAC that powers the 3A 
rated output NAC for control of compatible audible 
notification appliances only (

not for strobes

Three selectable operation modes: 

 

Synchronized operation

 allows a separate and 

dedicated control NAC to both activate and synchronize 
the Temporal Code 4 output timing of up to 20, 
4905-9835 modules 

 

Unsynchronized operation

 also allows the separate and  

dedicated control NAC to activate the Temporal Code 4 
output timing of up to 20, 4905-9835 modules, but 
without synchronization between the modules 

 

Stand-Alone operation

 allows the input NAC in alarm 

to activate Temporal Code 4 timing for NACs dedicated 
for CO gas alarm; no fire alarm signals are available, no 
control NAC is used 

 

For both Synchronized and Unsynchronized modes, 
when the control NAC is off, the module output NACs 
will follow the fire alarm signals of the input NAC 

 

NOTE:

 For TC4 output, both the input NACs and the 

control NACs requires a Steady On signal 

Compact, sealed construction: 

 

Mounts in standard 4” square electrical box 

 

Screw terminals for wiring connections 

Listed to UL Standard 864 and ULC Standard S527 

Description 

 

CO gas alarm warnings 

are required to be different from 

fire alarm warnings. In the event of a CO gas alarm, the 
presence of a Temporal Code 4 audible signal pattern 
identifies the type of condition to the responders to assist in 
determining the proper actions to be taken. 

*  This product has been approved by the California State Fire Marshal (CSFM) pursuant to 

Section 13144.1 of the California Health and Safety Code. See CSFM Listing 7300-0026:328 

for allowable values and/or conditions concerning material presented in this document. This 

product was not accepted by MEA (NYC) as of document revision date. Additional listings 

may be applicable; contact your local Simplex product supplier for the latest status. Listings 

and approvals under Simplex Time Recorder Co. are the property of Tyco Fire Protection 

Products. 

 

ON

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4905-9835 Temporal Code 4 Module 

(shown approximately 1/2 size) 

Description (Continued) 

 

CO gas alarm, or fire alarm.

 Use of the 4905-9835 

Temporal Code 4 Module allows the NFPA 720 Temporal 
Code 4 signal to be generated using a standard Steady On 
audible appliance NAC input. Under the fire alarm panel’s 
control, the audible notification signal can be selected for a 
conventional fire pulse pattern for a fire alarm condition, or 
the Temporal Code 4 pattern can be activated for a CO gas 
alarm condition. 

Specifications  

 

NAC Control 

For 24 VDC NACs, up to 3 A 
maximum, limited by input NAC 
rating; for control of audible 
notification appliances compatible 
with TC4 code pulse duty cycle 

Input NAC Current 
Requirements 

Supervisory current = 0.18 mA 
Alarm current = 15 mA 

Control NAC Current 
Requirements 

Supervisory current = 0 mA  
Alarm current = 3 mA 

Mounting Distance 
to input NAC Source 

Mount close-nippled, 20 ft (6 m) 
maximum distance  

Wire Connections 

Screw terminals for in/out wiring,  
18 to 12 AWG wire  
(0.82 to 3.31 mm

2

 ) 

Dimensions 

4” x 4 

” x 1 

” D 

(102 mm x 105 mm x 35 mm)  

Mounting Plate 
Material 

Sheet metal, galvanized 

Temperature Range 

32° to 120° F (0° to 49° C), 
intended for indoor operation 

Humidity Range 

Up to 93% RH at 100° F (38° C) 

 

 

Non-Addressable Peripherals 

UL, ULC, CSFM Listed;

 

 4905-9835 Temporal Code 4 

FM Approved*

 

Module for CO Gas Alarm Notification 

 

 

 

S4905-0006-5  4/2013

 

 

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