Honeywell SS4-A2 User manual

Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
Installation Guide and Operating Manual
MAN0931_V3_1510-001_RevH_06-13
i
Installation Guide and Operating Manual
Fire Sentry Model SS4-A/-A2
Multi-Spectrum Digital Electro-Optical Fire Detector
STAND-ALONE RELAY MODE or 4-20 mA Output Option

Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
Installation Guide and Operating Manual
MAN0931_V3_1510-001_RevH_06-13
ii

Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
Installation Guide and Operating Manual
MAN0931_V3_1510-001_RevH_06-13
iii
TABLE OF CONTENTS
PAGE
APPROVALS..................................................................................................................................................................1
SECTION 1 TECHNICAL DESCRIPTION.........................................................................................................................1
1.1 Features and Specifications..................................................................................................................1
1.1.1 General Description....................................................................................................................1
1.1.2 Applications................................................................................................................................3
1.1.3 Detector Locations .....................................................................................................................3
1.2 Stand-Alone Operation ..........................................................................................................................3
1.3 FS2000 System Operation .....................................................................................................................3
1.4 Overview ................................................................................................................................................4
1.4.1 Model SS4-A/-A2 Detector..........................................................................................................4
1.4.2 Detection Range and Field-of View .............................................................................................4
1.5 Configuration Settings...........................................................................................................................5
1.6 Testing ...................................................................................................................................................6
1.6.1 Special Conditions for Testing.....................................................................................................6
1.6.2 Automatic Testing.......................................................................................................................6
1.6.3 Manual Testing...........................................................................................................................6
SECTION 2 INSTALLATION............................................................................................................................................7
2.1 Installation Instructions.........................................................................................................................7
2.1.1Installation Precautions...............................................................................................................7
2.1.2 Conduit Installation.....................................................................................................................7
2.1.3 Wiring Recommendations...........................................................................................................7
2.1.4Power Supply Considerations.....................................................................................................7
2.2 Installation Procedure............................................................................................................................7
2.2.1 Configuring and Wiring Detectors................................................................................................7
2.2.2 Removing Detector From Its Enclosure. ......................................................................................7
2.2.3 Configuring the Detector Module.................................................................................................7
2.2.4 Wiring the Detector Module.........................................................................................................8
2.2.5 Wiring the SS4-A/-A2 Detector for 4 or 20 mA Current Mode Operation (Optional)........................8
2.2.6 Wiring the Detector Relays .........................................................................................................9
2.2.7 Replacing the Detector Module in the Enclosure..........................................................................9
2.3 Enclosure Installation (optional)..........................................................................................................10
SECTION 3 TROUBLESHOOTING AND MAINTENANCE .............................................................................................13
3.1 Model SS4-A/-A2 Detector Faults.........................................................................................................13
3.2 Cleaning Windowed Enclosures and Detectors..................................................................................13
3.3 Personnel Training...............................................................................................................................14
3.4 Detector Repair....................................................................................................................................14
DETECTOR PINOUT DATA ..................................................................................................................15
Verification Time ..............................................................................................................................................16
Latching...........................................................................................................................................................16
IR-Only Enable.................................................................................................................................................16
Test Cycle........................................................................................................................................................16
Fire Range.......................................................................................................................................................16
SECTION 4 OPTIONAL ACCESSORIES.......................................................................................................................17
4.1Air Shield for Applications in Contaminated Environment (Part No. DASA1-P).................................17
4.2 PC Software Kit (2029-INTERFACE-KIT)..............................................................................................17
4.3 4-20 mA Option (MA420-4)...................................................................................................................17
4.4 Detector Mounts (SM2 or SM4)............................................................................................................17
4.5 Test Lamp (Part No. FT-2045 / FT2145)................................................................................................17
INDEX...........................................................................................................................................................................18

Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
Installation Guide and Operating Manual
MAN0931_V3_1510-001_RevH_06-13
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APPROVALS
The Model SS4-A/-A2 Optical Fire Detectors have been manufactured in compliance with the requirements
of the ISO-9002 standard and have received:
•Factory Mutual (FM) for the United States
•CSA for Canada
SECTION 1
TECHNICAL DESCRIPTION
1.1 Features and Specifications
1.1.1 General Description
The Model SS4-A/-A2 Optical Fire/Flame Detectors are fast reacting (within 5 seconds), digital,
configurable, computerized, “smart” units. This Detector has sensitivity to Type A, B, and C flaming fires.
Detectors of this design process Ultraviolet (UV), Wide band Infrared (IR), and Visible (VIS) spectral
ranges from ruggedized Solar-blind UV, “Quantum-Effect” IR, and visible sensors correspondingly. They
are equipped with SRL-BIT (Built-In-Test) for optical “through the lens” of both the sensors and lens. The
Model SS4-A/-A2 UV, IR, and VIS Fire Detectors have false alarm immunity, and adjustable alarm range
between 15 and 60 ft. for a one square foot gasoline pan fire, with a 120-degree (±60 degrees from the
axis) conical field of view. Their microprocessor-based algorithms (FirePic, SnapShot, and Tri-Mode
Plot) assure time programmable alarm verification, Fire Signature Analysis, and compatibility with
standard approved fire alarm panels.
The Detector also has the flexibility to be re-configured in the field. Its installation is simple, and operation
straightforward due to the built-in self-testing feature. Therefore, the maintenance consists mainly in
keeping the Detector window lens clean and performing periodic testing required by the manufacturer of
the Fire Control and Suppression System.
Detector Technical Specifications
1.2.1 Mechanical Specifications
Enclosure Material: Copper Free Aluminum
316 Stainless Steel
Physical Dimensions: Assembly 4.35 in. (110.49 mm) Height X 4.81 in. (122.24 mm) Diameter
Mounting Holes ¼ in. (6.35 mm) Diameter, 5.50 in. (139.70 mm) Center to
Center
Conduit Entries Two (2) ¾ in. NPT or Two (2) 25 mm
Weight: Aluminum 3 lbs. 11 oz. (1.7 kg) approximately
Stainless Steel 7 lbs. 7 oz. (3.4 kg) approximately
Enclosure Rating: IP66 / NEMA 4 / NEMA 4X
Vibration: Meets or exceeds Mil Spec 810C,
Method 514.2, Curve AW
1.2.2 Electrical Specifications
Input Voltage Range: 18 VDC to 32 VDC
Normal Operation Current: 60 mA (nominal) 205 mA (nominal with heaterP
1
P)
Maximum Fire Alarm Current: 85 mA (maximum) 235 mA (maximum with heaterP
1
P)
Relay Contact Rating: 1 Amp @ 24 VDC resistive
Analog Current Output: 0 to 20 mA (Source or Sink, User Selectable)
(400 Ohms Max Load) 0.0 mA (<0.6 mA) =Fault
2.0 mA (±0.6 mA) = Dirty Window Lens
4.0 mA (±0.6 mA) = Normal, Safe (no Fault, no Fire)
20.0 mA (±0.6 mA) = Verified Fire Alarm
Screw Terminal Wire Sizes: 12 AWG to 22 AWG (2.50 mm to 0.762 mm)
Use stranded conductors (UnotUsolid core)

Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
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1.2.3 Environmental Specifications
Operating Temperature Standard: -40° F to +185° F (-40° C to +85° C)
Operating Humidity Range: 0 to 98% RH,
100% RH condensing for short periods of time
Storage Temperature: -67° F to +221° F (-55° C to +105° C)
1.2.4 Performance SpecificationsPP
Field of View: 120° Horizontal and Vertical (conical)
Sensitivity One (1) sq. ft. heptane reference fire at 60 feet
Speed of Response: 2 to 5 seconds (typical)
High Speed Response: Less than 0.5 seconds to “fireball” type fires (if selected)
Spectral Sensitivity 0.4 to 3.5 micron wavelengths, TriBand Dual IR Plus
1.2.5 Hazardous Area Classifications
North America, ATEX, IECEx:
Class I, Division 1, Groups A, B, C & D Class I, Zone 1,
Class II, Division 1 Groups E, F & G AEx d IIC xx, II 2 G Ex d IIC xx
Class III II 2 D Ex tD A21 IP66 T135°C
T4: Ta = -40°C to +110°C2xx=T4: Ta = -40°C to +110°C2
T5: Ta = -40°C to +75°C2T5: Ta = -40°C to +75°C2
T6: Ta = -40°C to +60°C T6: Ta = -40°C to +60°C
InMetro:
Ex d IICxx Gb
xx=T4: Ta = -60°C to +110°C2
T5: Ta = -60°C to +90°C2
T6: Ta = -60°C to +75°C
1.2.6 Additional Certifications
FM verified and approved to meet FM 3260 Radiated Energy-Sensing Fire Detectors for
Automatic Fire Alarming Signals.
1
PHeater circuit turns ON only when temperature drops below zero degrees Fahrenheit (-17° C)P
2The supply connection wiring shall be rated at least 10°C above the rated service temperature (120°C for T4 applications and 85°C
for T5 applications)
1.2.7 Other Specifications:
LED Visual Indicators:
Powered Detector: Dual LEDs blink every 10 seconds
Fault Declared: One LED turns ON solid until the fault is cured
Re-calibrate when: Both LEDs flash ON and OFF rapidly
Fire Declared: Both LEDs ON solid (one LED blinks during first few seconds)
Relay Contact:
Rating: 0.5 Amp at 120 Volt AC or 1 A at 24 V DC resistive
Fire relay: N.O. and N.C. contacts (Latching/Non-Latching, switch selected)
Verification relay: N.O. and N.C. contacts (Adjustable time from 0 to 30 seconds)
Fault relay: N.O. and N.C. contacts

Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
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1.1.2 Applications
Applications of the Model SS4-A/-A2 Detectors include warehouses, aircraft hangars, petrochemical
facilities, Silane gas storage, Gas turbines, and Power plants, among others.
1.1.3 Detector Locations
For unobstructed performance, considering Detector locations in application areas, avoid sources, other
than fire, which may cause false alarms, such as operations utilizing welding or gas torch equipment, high
power sources of EMI or RFI, or artificial lighting pointed directly at the Detector. Locations experiencing
strong mechanical or acoustical vibrations should also be avoided. For optimum performance, locate the
Detector(s) as close as possible to the potential fire source, preferably, along the axis of the vision cone.
Install enough Detectors to completely eclipse the fire hazardous area. Assure accessibility for the
Detector lens cleaning, as well as best possible protection and/or cleaning from fog, rain, ice, dust,
hazardous atmospheres, and other adverse elements. If necessary, utilize the Steel Swivel Mount (Model
SM2) or 316 Stainless Steel Swivel Mount (Model SM4) for greater flexibility in mounting locations (See
Figures 4 and 5).
1.2 Stand-Alone Operation
For Stand-Alone operation, the Model SS4-A/-A2 Detector may be connected to a suitably approved
transmitter or control system/panel. The Detector operated in the Stand-Alone mode uses the Fire, Fault,
and Verify (optional) relays to interface to the Fire/Security Panels. For Stand-Alone operation, the
Detector’s Fault relay is automatically configured by the on-board microprocessor. The input current of
the Model SS4-A/-A2 Detector is about 15 mA higher in the Stand-Alone mode compared to FS2000
System operation.
NOTE: The Fault relay is not available when the Detector is wired to the FS2000 System.
1.3 FS2000 System Operation
For FS2000 System operation, the Detector Fire and Fault signals are sent digitally to the FS2000 System
Controller using the four wire FS2000 FireBus. The FireBus provides the 24 Volt DC power for the
Detector and RS-485 digital communication (Refer to Fire Sentry document MN0003 entitled "FS2000
FIRE EARLY WARNING SYSTEM - INSTALLATION and OPERATIONS GUIDE"). For special remote
alarm applications, users may also connect directly to the Detector’s Fire alarm relay.
NOTE: When the Model SS4-A/-A2 Detector is connected to the FS2000 System using FireBus
communication, the Controller automatically disables the Detector’s Fault relay.

Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
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1.4 Overview
1.4.1 Model SS4-A/-A2 Detector
Version SS4-A: There are two (2) LEDs on the Model SS4-A Detector that indicate the state of the
Detector. During normal operation both LEDs will blink every 10 seconds.
If the Detector alarms to a fire, it energizes the Fire relay and turns on both LEDs in the following
sequence. One LED is turned on immediately and the second LED will rapidly blink for several seconds
indicating that the Detector's FirePic spectra is being permanently stored in the Detector's solid-state
memory (FirePic is the several seconds of Detector spectral data which precedes an alarm event). Once
the FirePic data is stored, the second LED will remain on. For this version, the fire alarm LEDs turn on and
remain on until power to the unit is cycled (turned off and on again).
If the Detector has a Fault, it de-energizes the Fault relay and turns one (1) LED on (the LED will not light if
the Fault is a “No Power Fault”). If the Fault condition, such as a “Low Voltage Fault”, is eliminated the
Detector will automatically return to Normal Operation.
NOTE: Faults caused by excessive input voltage or due to temperatures outside the operating temperature
range require factory re-certification. Re-certification is required if a Fault is indicated by both LEDs rapidly
blinking (with frequency about 2 Hz.).
Version SS4-A-2: The operation of this unit is identical to the SS4-A, except the fire alarm LEDs turn off
once the fire threat is eliminated, without power cycling of the device.
1.4.2 Detection Range and Field-of View
The SS4-A/-A2 detection range is field adjustable between 4.5m (15ft.) and 18.2m (60 ft.) in 4.5m
(15 ft). increments to an industrial standard of one square foot Gasoline, Kerosene, or isopropyl Alcohol
pan fire within 5 seconds.
The Detector is also optimized for the following specific type of fuels and will alarm to the resultant fire
within five (5) seconds. Careful attention should be given to the Detector sensitivity setting for these types
of fires.
•Silane Gas: 254mm (10”) fire height using a 4.74mm (3/16”) orifice at a distance of 4.5m (15 ft.)
with the Detector sensitivity setting of 4.5m(15 ft.)
•Propane Gas: 254mm (10”) fire height using a 9.5mm (3/8”) orifice at a distance of 4.5m (15 ft.)
with the Detector sensitivity setting of 4.5m(15 ft.)
•Jet fuel-A: 0.1 m2 (one square foot) pan fire at a distance of 18.2m (60 ft.) with the Detector
sensitivity setting of 18.2m (60 ft.)
•JP-5: 0.1 m2 (one square foot) pan fire at a distance of 18.2m (60 ft.) with the Detector sensitivity
setting of 18.2m (60 ft.)
•JP-4: 0.18 m2(two square foot) pan fire at a distance of 30.4m (100 ft.) with the Detector
sensitivity setting of 18.2m (60 ft.)
•JP-8: 0.18 m2(two square foot) pan fire at a distance of 30.4m (100 ft.) with the Detector
sensitivity setting of 18.2m (60 ft.)
The Detector incorporates a 120-degree conical Field of View. The fire emissions received by the Detector
diminish at extreme range and edges of the field-of-view. It is recommended that the Detector be pointed
at the fire threat area for the fastest response times to the smallest size fire. When multiple Detectors are
used to cover large areas, the Field-of-Views should overlap to insure complete coverage of the fire threat
area. The Field-of-View is not, however, limited to 120 degrees. Larger fires outside the 120 degree Field-
of-View may cause the SS4-A/-A2 to alarm. This is based on the Inversed Square Law for radiated
energy, a larger size fire outside the Detection Range and field-of-view may cause the Detector to alarm.
Refer to Figure 1.

Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
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Figure 1: Field of View, Horizontal, and Vertical.
Sensitivity to 1 Sq. Ft. Gasoline Pan Fire
1.5 Configuration Settings
The SS4-A/-A2 Detector may be reconfigured in the field and thus optimized for special applications. The
configuration of the Detector is set using DIP switches located on the middle circuit board of the Detector
Module. The DIP switch settings for each configuration are listed in Table 2.
These configurable options include:
1. Fire Verify Relay - The Verify Relay may be disabled or enabled with several Verify Time settings. It
also may be set to act as another Fire Relay. The Verify Time may be set from 5 to 30 seconds in 5
seconds increments. The Factory setting: Verify Relay Disabled.
When the Verify Relay is enabled and Verify Time is set the Verify Relay will energize and the Fire
Relay will de-energize if the fire conditions are still present at the end of the Verify Time period. In the
opposite case, the Detector will wait for 5 seconds plus another Verify Time period to test for the fire
conditions. This wait and verify cycle will repeat 10 times, or until the presence of the fire is confirmed.
This concludes the verification process. If the presence of the fire is not established the Fire Relay will
remain energized unless Non-Latching mode is set. In case a subsequent fire is detected the entire
verification process will be repeated. The state of the Fire and Verify Relay after the verification
process will depend on the choice between Latching and Non-Latching modes.
NOTE: When the Verify Relay is enabled and Verify Time is set, the Fire Relay will de-energize
when the Verify Relay is energized.
2. Latching / Non-Latching - The Fire Relay and Verify Relay may be set in a Latching or Non-Latching
mode. The Factory setting for the SS4-A is Latching and the SS4-A-2 is Non-Latching.
If the SS4-A or SS4-A-2 Latching mode is selected, the Fire or Verify Relay will energize and Red
LEDs will remain illuminated until the Detector power is cycled (power is turned off then on).
If the SS4-A Non-Latching mode is selected, the Fire or Verify Relay will de-energize after 10 seconds
and the Red LEDs will remain illuminated until power is cycled.
If the SS4-A-2 Non-Latching mode is selected, the Fire or Verify Relay will de-energize and the Red
LEDs will turn-off after 10 seconds.
3. Test Period - This setting pertains to the Through-the-Lens test period, which may be set to 6 or to 30
minutes. The Factory setting is 30 minutes. The 6-minute period may be required in applications
where the lens is frequently obscured.
NOTE: Utilization of the 6-minute period may adversely affect the source tube service life.

Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
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4. IR-Only Enable / Disable
The IR-only setting allows the Detector to declare a Fire on events where UV is not present or is
obscured. In applications where UV absorbing fumes are commonly present in high concentrations
(these fumes are usually toxic and should require masks or breathing equipment), the Detector will
function. The Factory setting for IR-Only is Disabled.
WARNING: IR-only setting should be used only in special indoor applications.
5. Fire Detection Range Setting - 15, 30, 45, or 60 ft.. The Factory setting is 45 ft..This setting should
be changed only if the Detector is located too close to the fire threat area and in the presence of
abnormally high UV.
1.6 Testing
1.6.1 Special Conditions for Testing
The SS4 Detector should be tested immediately after installation, after repair or maintenance involving
wiring or module replacement, after periodic maintenance, or after lens contamination has been identified.
1.6.2 Automatic Testing
Automatic SLR-BIT (Built In Test) “through-the-lens” self-testing is performed, during Detector operation,
for virtually all-internal electronic systems at the selected Test Period (Section 1.5, 3). One of the Red
LEDs will remain illuminated (Fault) to indicate contamination of the window lens, missing the protective
Self-test grill, or when removing the enclosure cover.
1.6.3 Manual Testing
For manual testing, the SS4-A/-A2 Detectors may be exposed to an actual industry standard open flame or
to a Test Lamp simulating a fire. It is mandatory to use the Fire Sentry handheld UV/IR Test Lamp Model
No’s FT-2045 or FT-2145 with SS4 Fire Detectors. The FT-2045 and FT-2145 Test Lamps are housed in
an Explosion-Proof enclosure, powered by internal rechargeable batteries, and designed for indoor and
outdoor use. For additional information on the Test Lamp, refer to FSC Specification SP0242 for the FT-
2045 or FSC Specification 1505-008A for the FT-2145.
NOTE: Other manufacturers UV/IR Test Lamps should not be utilized to test FSC Detectors; conversely,
the FT-2045 and FT-2145 Test Lamps should not be utilized for testing other manufacturer’s Detectors.

Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
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SECTION 2
INSTALLATION
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 OFF before connecting the Detector.
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. After the configuration settings and wiring connections have been
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.

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2.2.4 Wiring the Detector Module.
a. Insert the cables into the metal enclosure base through one of the conduit openings. Refer to
Figure 6.
b. Connect the 24 Volt DC power supply wires to pins 1 (-) and 4 (+) of the J1 or J2 connector,
observing the correct polarity. Refer to Figure 2. Firmly tighten down the two slotted screws
with a small screwdriver taking care not to over-tighten the screws.
Pins 2 and 3 of the J1 and J2 connectors are the RS-485 interface used only for downloading
the FirePic from the Detector’s non-volatile memory, or for viewing the Tri-Mode Plot. It is
recommended to wire pins 2 and 3 to a separate junction box and properly identify them for
future use. A color-coded, multi-connector, shielded, UL-rated cable with 18 to 24-gauge wire is
recommended for connecting to J1 or J2. The following color-coding is suggested as a
guideline:
Pin 1 Pin 2 Pin 3 Pin 4
Black Green or Blue White or Yellow Red
DC RETURN (-) RS-485( -) RS-485( +) +24 VDC POWER (+)
*Fault Relay
Verify
Relay
* Fault relay is shown in the energized condition during normal operation (No Fault).
Figure 2: Model SS4-A/-A2 Detector Wiring
(Bottom View of SS4-A/-A2 Detector Module)
2.2.5 Wiring the SS4-A/-A2 Detector for 4 or 20 mA Current Mode Operation (Optional)
For applications requiring a 4-20 mA analog output, order the Detector with the Optional 4-20 mA Module
Assembly, P/N MA420-4. The module must be Factory installed and certified along with the Detector.
The following analog output levels are available from the Detector equipped with the MA420-4 Module.
The module is capable of driving a maximum load impedance of 283 Ohms:
NORMAL Operation 4 +/-0.6 mA
ALARM 20 +/-0.6 mA
FAULT < 0.6 mA
To use the analog output of an SS4-A/-A2, make the following connections:
24 V DC J2, pin-4
24 V DC RTN J2, pin-1

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4-20 mA output J5, pin-4 (+)
4-20 mA RTN J1, pin-1 (-)
The fire Alarm and fault relays of a Detector equipped with the MA420-4 Module are not usable. However
the Detector’s Verify Relay may still be used as a separate Fire Alarm output. Refer to Table 2:
“Configuration DIP Switch Settings” to set DIP switches properly.
NOTE: J1 is a "loop through" connection to J2. The +24 V supply is connected to J2 pin 4. The red lead
connection of the MA420-4 must stay in J1, pin-4. Also, the 8.66 K Ohm supervising resistor must
remain connected at the Fire Alarm relay contacts J4 pin-4 to J4 pin-1, or a Fault condition will
occur.
Figure 3: SS4 Detector Module with MA420-4 Installed
(Rear View)
2.2.6 Wiring the Detector Relays
a. Insert relay cables into the Detector enclosure base through one of the conduit openings.
Refer to Figure 6.
b. Fire Alarm Relay - Connect wires for Fire Alarm to the appropriate J4 terminals of the
Detector. For Normally Open relay contacts, install wires into pins 3 and 4 and firmly tighten
down the slotted screws with a small screwdriver. The Fire Alarm relay is de-energized during
normal operation and will energize when detecting a fire.
c. Fault Relay – Connect wires for Fault to the appropriate terminals of the J5 connector. For
Normally Closed relay contacts, install wires into pins 3 and 4 and firmly tighten down the
slotted screws with a small screwdriver. The fault relay is energized during normal operation
and with no fault detected, as shown in Figure 2. The fault relay will de-energize when a fault
is detected.
2.2.7 Replacing the Detector Module in the Enclosure.
a. Carefully re-install the module over the three metal standoffs and screw it down with the three
captive screws to the standoffs.
b. If necessary, clean the Detector’ sensors and windowed cover per instructions of Section 3.2.
c. Securely screw down the metal enclosure top windowed cover and tighten the Allen-head
"tamper-proof" screw.

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2.3 Enclosure Installation (optional)
2.3.1 Installing the Detector on the Swivel Mount (SM2) or SS Extra Duty (SM4) Swivel Mount
a. Select fasteners for the swivel mounting such that they will secure it to the type of material at the
enclosure location.
b. Mount the swivel-mount to the wall assuring correct orientation.
c. Install the mounting bracket onto the Model SS4-A/-A2 Detector enclosure using the #¼-20 or #6
mm screws and nuts provided. If oriented correctly, the outside contours of the mounting ears on
the Detector enclosure and the ends of the bracket will match. The large diameter of the threaded
insert should face the enclosure.
d. Screw the enclosure/bracket assembly onto the ball or swivel stud. Turn the Detector until the stud
bottoms against the enclosure. Do not tighten. While holding the enclosure, tighten the jam nut
against the bracket.
e. While holding the enclosure, loosen the socket head screw on the SM2 swivel-mount or swivel
release bolt on the SM4. Position the enclosure in such a way that the conduit openings are located
horizontally at the bottom. Point the enclosure in the desired direction and tighten the appropriate
hardware.
4.86
4.26
2.95
2.00
0.295
Dia.
4.7”
approx.
Figure 4: Model SM2 Swivel Mount

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Figure 5: Model SM4 Stainless Steel Swivel Mount
2.09
4.66
1.10
0.67
4.38
2.40
3/4
NPT
1.50
Figure 6: Model SS4-A/-A2 Detector Enclosure - Side View

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Figure 7: Model SS4-A/-A2 Detector Enclosure - Rear View

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SECTION 3
TROUBLESHOOTING AND MAINTENANCE
3.1 Model SS4-A/-A2 Detector Faults
The Model SS4-A/-A2 Detector issues a Fault (or Trouble) condition by de-energizing its Fault Relay (J5
connector). The following are Detector Faults:
a. Temperature Fault: The Detector faults if the internal temperature during operation rises above
85°C or falls below -40°C causing both LEDs to blink rapidly. Corrective action for this type of fault
requires factory re-certification.
b. Excessive Input Voltage Fault: The Detector faults if the input voltage is too high (greater than 45
Volts) causing both LEDs to blink rapidly. Corrective action for this type of fault requires factory re-
certification.
c. Low Input Voltage Fault: The Detector faults if the input voltage is too low. The user should check
the voltage between Pins 1 and 4 of the power connector J1 or J2. In this case one LED is on until
the fault is corrected. If the voltage is below 15 Volts the user should check the wiring and the power
supply.
d. No Power Fault: The Detector faults if the input voltage is interrupted or turned off causing the
absence of LED indication. The user should measure the voltage between Pins 1 and 4 of the power
connector J1 or J2. If none or very low voltage is measured, the user should check the wiring and
the power supply.
e. Detector Fault: The Detector faults if its Optical Sensors fail the automatic built-in “through the
lens” test. In this case one LED is on until the fault is corrected. The user should first clean both
inside and outside of the lens thoroughly, then clean the exposed surface of the Detector sensors
and the protective grill mounted on the outside of the housing cover. If the fault has not been
eliminated after re-assembly and powering up for 10 to 15 minutes, factory service may be
necessary.
f. Relay Fault: The Detector faults if one of its Relay circuits fails. In this case one LED is on until the
fault is corrected. The user should return the unit to the factory for service.
g. Self-Checking Fault: The Detector faults if its internal microprocessor finds a failure during self-
checking of the hardware and software. In this case one LED is on until the fault is corrected. This
type of fault may be caused by a number of reasons. The user should verify proper grounding of the
device and the absence of noise on the power cables. If fault persists the user should return the
Detector to the factory for service.
h. Analog “0” current: All the above faults will produce an output current loss (0 + 0.6mA) with the 4-
20 mA module option.
3.2 Cleaning Windowed Enclosures and Detectors
The optical window (lens) of the Model SS4-A/-A2 Detector should be cleaned periodically on a regular
maintenance schedule. For clean area applications, perhaps monthly cleaning schedule will be sufficient.
For extremely contaminated application environments, such as truck filling stations with presence of black
carboneous smoke, daily cleaning schedule may be necessary.
Clean the window of the Detectors each time they are handled, the windows appear contaminated, fails
Built-In-Test, or the Detector fails an end-to-end test with a handheld UV/IR Test Lamp FT2045 or FT-
2145. If necessary, clean the Detector Module Sensors each time the Detector has been disassembled for
wiring or replacement.
Use a blast of an air hose or an oil-free cloth to clean the enclosure window. Oil degrades the performance
of UV Detectors. Occasionally, the use of a solvent, such as alcohol is acceptable. No disassembly of the
Detector is required.
DO NOT USE SILICONE-BASED OR COMMERCIAL WINDOW CLEANING PRODUCTS.
THESE WILL DEGRADE THE MODEL SS4-A/-A2 DETECTOR PERFORMANCE.

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3.3 Personnel Training
Troubleshooting of the Model SS4-A/-A2 Detector should be performed only by qualified authorized
personnel observing all standard safety practices. Although the Detector operates on safe 24 Volts DC, the
FM Approved or UL listed Fire Alarm Panel's power supply may operate on life threatening 120 or 240
Volts AC.
WARNING: Hazardous voltages may be present during
testing procedures. Serious injury or death may result
due to failure to observe safety precautions.
CAUTION: Model SS4-A/-A2 Detector modules and its components are
susceptible to permanent damage due to electrostatic discharge (ESD). Do NOT
handle a module without adequate grounding precautions.
3.4 Detector Repair
Return the defective module to the factory for repair service.
THERE ARE NO USER SERVICEABLE PARTS IN A DETECTOR MODULE.
If the Model SS4-A/-A2 Module must be shipped back to the factory for repair, it MUST be packed in static
protective material. If not available, the Module should be carefully wrapped with aluminum foil. An RMA
(Return Material Authorization) is required for all returns to the factory. Contact Fire Sentry Customer
Service at 714-694-2700 or your Distributor for an RMA number before shipping a unit back to the factory.

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DETECTOR PINOUT DATA
TABLE 1: Stand-Alone Model SS4-A/-A2 Detector Connectors - Pinouts
J1: DETECTOR INPUT POWER
PIN
1 DC Return ( - )
2 and 3:RS-485 Connection to an optional interface unit for viewing FirePic and TriMode Plot.
4 Power (+24 Volts DC)
J2: DETECTOR POWER OUT
PIN
1 DC Return ( - )
2 and 3:RS-485 Connection to an optional interface unit for viewing FirePic and TriMode Plot.
4 Power (+24 Volts DC)
J4: FIRE RELAY
PIN
1 Fire Relay Common
2 Fire Relay Normally Closed
3 Fire Relay Common
4 Fire Relay Normally Open
J5: FAULT RELAY (Energized) J6: FIRE VERIFY RELAY
PIN PIN
1 Fault Relay Normally Open 1 Verify Relay Common
2 Fault Relay Common 2 Verify Relay Normally Open
3 Fault Relay Normally Closed 3 Verify Relay Common
4 Fault Relay Common 4 Verify Relay Normally Closed

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TABLE 2: Configuration DIP Switch Settings
Verification Time
DIP SWITCH
1
DIP SWITCH
2
DIP SWITCH
3
DESCRIPTION
closed
closed
closed
Verify is disabled and the Verify Relay is unused. Factory setting
closed
open
open
Verify is enabled and the Verify time is 5 seconds.
open
closed
open
Verify is enabled and the Verify time is 10 seconds.
closed
closed
open
Verify is enabled and the Verify time is 15 seconds.
open
open
closed
Verify is enabled and the Verify time is 20 seconds.
closed
open
closed
Verify is enabled and the Verify time is 25 seconds.
open
closed
closed
Verify is enabled and the Verify time is 30 seconds.
open
open
open
Verify is disabled and the Verify Relay operates as a second Fire Relay.
Latching
DIP SWITCH
4
DESCRIPTION
open
Non
-Latching mode. If Verify is enabled then the Verify Relay will de-energize approximately 10
seconds after it energizes. If Verify is disabled then the Fire Relay(s) will de
-energize
approximately 10 seconds after it energizes. The SS4-A2 Factory setting is Non-Latching
closed
Latching mode. If Verify is enabled then when the Verify Relay energizes it will remain
energized until the Detector is reset. If Verify is disabled then when the Fire Relay energizes it
will remain energized until the Detector is reset. The SS4-A Factory setting is latching
IR-Only Enable
DIP SWITCH
5
DESCRIPTION
open
Fire Alarm declaration UV and IR energy. Factory setting
closed
A Fire Alarm may be declared without UV being detected.
Test Cycle
DIP SWITCH
6
DESCRIPTION
open
Testing of the Lens occurs every 30 minutes. Factory setting
closed
*Testing of the Lens occurs every 6 minutes
* Utilization of the 6-minute period may adversely affect the source tube service life.
Fire Range
DIP SWITCH
7
DIP SWITCH
8
DESCRIPTION
open
open
Set to detect an industry standard 1 sq. ft. fire at 15 ft. on axis.
closed
open
Set to detect an industry standard 1 sq. ft. fire at 30 ft. on axis.
open
closed
Set to detect an industry standard 1 sq. ft. fire at 45 ft. on axis. Factory setting
closed
closed
Set to detect an industry standard 1 sq. ft. fire at 60 ft. on axis.

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SECTION 4
OPTIONAL ACCESSORIES
4.1 Air Shield for Applications in Contaminated Environment (Part No. DASA1-P)
For installation in areas with high levels of airborne contaminants the Detector Air Shield should be
mounted to the Flame Detector housing. The Airline fitting accepts ¼” O.D. nylon tubing for an instrument
grade air supply of 5 to 15 psi @ 6 cubic ft. per minute.
4.2 PC Software Kit (2029-INTERFACE-KIT)
PC DOS Software Kit installation facilitates access to FirePicand SnapShotand provides Detectors
operation monitoring capability through the Detector’s RS485 connections. The Kit includes an Interface
Box, a PC software diskette, an RS485 and RS232 cables, and a 120 VAC/12 VDC charger. Optional 220
VAC/12 VDC charger is also available upon request.
4.3 4-20 mA Option (MA420-4)
The 4-20 mA module is by Factory Mutual (FM) recognized device to be used with all approved SS4 type
Detectors. Fire Sentry is required by FM to install this device at the factory and certifies this option along
with the Detector. Refer to Section 2.2.5 for system wiring details.
NOTE: Converting Field units of the SS4 Stand-alone relay type to the 4-20 mA version requires the unit
be returned to the factory for installation and certification.
4.4 Detector Mounts (SM2 or SM4)
The heavy duty steel Swivel Mount (SM2) or extra duty Stainless Steel Swivel Mount (SM4) may be
utilized for mounting the SS4 type Detectors. Refer to Section 2.3 for details.
4.5 Test Lamp (FT-2045 or FT-2145)
This battery powered, portable, explosion-proof handheld test source for remote activation of the SS4 type
Detectors simulates the radiant energy emitted by an actual fire in order to test the Detectors operation
without the need for an open flame. The unit is rechargeable with a 120VAC / 12VDC charger. Optional
220 VAC/12 VDC charger is also available upon request.