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Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
Installation Guide and Operating Manual
MAN0931_V3_1510-001_RevH_06-13
2.1
Installation Instructions
This section describes the installation of the Model SS4-A/-A2 Detector for the Stand-Alone relay mode. It
is recommended that junction boxes be used to wire the Detectors. Determine the configuration settings
for the device(s) and the number of connections to be used (Fire, Fire Verify, Fault, and Power) depending
on the desired Detection Range and the Fire Control Panel type used (refer to the Fire Control Panel
Manual for details).
2.1.1
Installation Precautions
The following precautions should be observed during installation of Model SS4-A/-A2 Detectors.
1.
Make sure that the external electrical power is turned
2.
Printed circuit board components of the Detector are susceptible to damage from electrostatic
discharge. Do not handle the Detector's module (and its printed circuit boards) without
adequate grounding and observing all necessary measures to prevent the effect of electrostatic
discharge (ESD).
2.1.2
Conduit Installation
When planning the conduit, follow these recommendations.
1.
If only one of the two 3/4 inch NPT conduit openings on the Model SS4-A/-A2 Detector enclosure
is used, seal the unused opening with a threaded plug and approved sealing material.
2.
In areas where moisture may accumulate, install an approved conduit trap or drain.
3.
A seal should be installed 6" from the enclosure wall for all applications requiring a Class I, Div. 1
Explosion-Proof rating.
2.1.3
Wiring Recommendations
To prevent intermittent connections, Fire Sentry Corporation recommends using junction boxes. Install a
junction box near each Detector location. Wire each Detector to its junction box. Use screw-down
terminal strips inside the junction box to make the connections from the Detector's terminals to an FM
Approved or UL listed Fire Alarm Panel. Also use FM/UL Approved junction boxes and terminal strips.
NOTE: Avoid wire splices. However, if wire splices are necessary, all splices should be soldered.
Utilization of good wiring practices will simplify installation, improve reliability, and facilitate maintenance.
2.1.4
Power Supply Considerations
The Model SS4-A/-A2 Detector uses 24 Volts DC at a maximum current of 75 mA (with the 4-20 mA option
the maximum supply current is 95 mA). Make sure the Panel's power supply can withstand the load current
of the total number of Detectors connected to it. For example, if 10 (ten) Model SS4-A/-A2 Detectors are
connected to a single Panel's power supply (multiplying 75 mA by 10), the power supply must be able to
withstand at least 750 mA + 10% (0.75 A + 10%). This load current must also be taken in consideration for
calculating the Panel's 24-hour power backup requirements.
2.2
Installation Procedure
2.2.1
Configuring and Wiring Detectors
To configure and wire a Model SS4-A/-A2 Detector, or to replace the Detector module, the module must be
removed from the enclosure.
completed, the module should soon be re-installed in the enclosure to avoid contamination from the
environment.
NOTE: Avoid touching the Detector sensors at the front of the Detector module. If touched
accidentally, they should be cleaned per instructions of Section 3.2.
2.2.2
Removing Detector From Its Enclosure.
a. With electrical power off (verify that electrical power is off by making sure that the Detector's
LEDs do not blink for at least 15 seconds), loosen the Allen-head screw at the base of the
metal enclosure top lens cover.
b. Remove the cover and set it aside along with the "O" ring avoiding contamination.
c. Loosen the three Philips head captive screws located on the top circuit board.
d. Carefully lift out the module, sliding it along the three metal standoffs.
2.2.3
Configuring the Detector Module.
Set the DIP switches located on the center PC board of the Detector module to desired settings.
Refer to Section 1.5 and Table 2 for DIP switch settings.
SECTION 2
INSTALLATION
After the
configuration settings and wiring connections have been
before connecting the Detector.
OFF
7
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