4WT-B - Smoke detector System Sensor - Free user manual and instructions

Product Type	Photoelectric Smoke Detector
Brand	System Sensor
Model	4WT-B
Detection Principle	Photoelectric (light scattering)
Operating Voltage	12-24 VDC (nominal)
Standby Current	≤ 100 µA (typical)
Alarm Current	≤ 50 mA (typical)
Dimensions (Diameter x Height)	4.0 in (102 mm) x 1.7 in (43 mm)
Weight	3.5 oz (100 g)
Operating Temperature Range	32°F to 120°F (0°C to 49°C)
Humidity Range	0% to 93% relative humidity (non-condensing)
Alarm Output	Form A (NC) relay, 2.0 A @ 30 VDC
Remote Output	Optional remote indicator (RA-4WTR)
Self-Diagnostic Function	Automatic drift compensation and sensitivity test
Mounting Base	Compatible with System Sensor 4WTA-B base (sold separately)
Maintenance	Clean with vacuum or soft brush every 6 months; do not use water or solvents
End-of-Life Warning	Audible chirp after 10 years of operation
Compliance	UL 268, CSFM, NFPA 72
Warranty	5 years limited
Spare Parts	Replacement detector head (4WT-B), mounting base (4WTA-B), remote indicator (RA-4WTR)
Repairability	Non-repairable; replace entire unit if defective

Frequently Asked Questions - 4WT-B System Sensor

What type of smoke detector is the System Sensor 4WT-B?

The 4WT-B is a photoelectric smoke detector that uses light scattering to detect smoke particles.

What voltage does the 4WT-B require to operate?

It operates on a nominal 12-24 VDC power supply.

How do I install the 4WT-B?

Mount the detector on a compatible base (e.g., 4WTA-B), connect wiring per the manual, and twist the detector onto the base. Ensure the tamper-resist feature is engaged.

Can I use the 4WT-B with any fire alarm panel?

It is compatible with most fire alarm control panels that support two-wire conventional detection loops with 12-24 VDC.

Why is my 4WT-B detector chirping?

A chirp may indicate low sensitivity, end-of-life (after 10 years), or a dirty chamber. Check the manual for specific chirp patterns.

How often should I clean the smoke detector?

Clean the detector every 6 months using a vacuum or soft brush. Do not use water, solvents, or compressed air.

What is the detection area coverage for the 4WT-B?

The detector covers an area of approximately 30 ft x 30 ft (900 sq ft) on a smooth ceiling, as per NFPA 72 guidelines.

Can I use a remote indicator with the 4WT-B?

Yes, the RA-4WTR remote indicator allows you to see the alarm status from a remote location.

How do I test the 4WT-B?

Press and hold the test button on the detector for 5 seconds. The alarm should sound within 30 seconds.

What should I do if the detector goes into alarm falsely?

Check for steam, cooking fumes, or dust. Clean the detector or relocate it away from kitchens and bathrooms.

USER MANUAL 4WT-B System Sensor

ELECTRICAL SPECIFICATIONS	2-WIRE	4-WIRE
System Voltage -Nominal:	12/24	12/24 Volts Non-polarized
Min.:	8.5	8.5 Volts
Max.:	35	35 Volts
Max. Ripple Voltage:	30	30 % peak to peak of applied voltage
Max. Standby Current:	50	50 μA average
Peak Standby Current:	100	— μA
Max. Alarm Current:	130	20 mA 12 Volt Systems
(For 2W-B and 2WT-B, panel must limit current)	130	23 mA 24 Volt Systems
Alarm Contact Ratings:	—	0.5 Amp @ 30 V AC/DC
Alarm Reset Time:	0.3	0.3 sec
Max. Start-up Capacitance:	0.1	— μF
Latching Alarm: Reset by momentary power interruption
Maximum Initial
Start-up Time:	45	15 sec
Alarm Verification*
Start-up Time:	15	15 sec

* Assumes the panel's alarm verification reset time is 10 seconds or less. Should the alarm verification reset exceed 10 seconds, use the maximum initial start-up time.

PHYSICAL SPECIFICATIONS

Heat Sensor (Model 2WT-B and 4WT-B):	135°F (57.2°C)
Freeze Trouble (Model 2WT-B and 4WT-B):	41°F (5°C)
Operating Temperature Range:
2W-B and 4W-B:	32 to 120°F (0 to 49°C)
2WT-B and 4WT-B:	32 to 100°F (0 to 37.8°C)
Operating Humidity Range:	0 to 95% RH non-condensing
Storage Temperature Range:	-4 to 158°F (-20 to 70°C)
Diameter (including base):	5.3 inches
Height (including base):	2.0 inches
Weight:	6.3 oz.

BEFORE INSTALLING

Please read thoroughly System Sensor's Applications Guide for System Smoke Detectors (SPAG91), which provides detailed information on detector spacing, placement, zoning, wiring, and special applications. This manual is available online at www.systemsensor.com. s

NOTICE: This manual shall be left with the owner/user of this equipment.

IMPORTANT: This detector must be tested and maintained regularly following NFPA 72 requirements. At a minimum, cleaning should be performed annually.

GENERAL DESCRIPTION

Models 2W-B and 2WT-B are 2-wire photoelectric smoke detectors; models 4W-B and 4WT-B are 4-wire photoelectric smoke detectors. All models incorporate a state-of-the-art optical sensing chamber and an advanced microprocessor. The microprocessor allows the detector to automatically adjust its sensitivity back to the factory setting when it becomes more sensitive due to contaminants settling in its chamber. In order for this feature to work properly, the chamber must never be opened while power is applied to the smoke detector. This includes cleaning, maintenance or screen replacement. Should it become necessary, the screen/sensing chamber is field replaceable. Models 2WT-B and 4WT-B also feature a restorable, built-in, fixed temperature (135°F) thermal detector and are also capable of sensing a freeze condition if the temperature is below 41°F.

All i ³ Series detectors are designed to provide open area protection. Two-wire models must be used with compatible UL Listed panels only.

When used with an i ³ Series compatible control panel or the i ³ Series 2W-MOD2 module (refer to installation manual D500-46-00), the 2W-B and 2WT-B are capable of generating a “maintenance needed” signal. The 2W-MOD2 can indicate a need for cleaning, replacement, or a freeze condition (2WT-B only) at the control panel or module.

Installation of the 2W-B, 2WT-B, 4W-B, and 4WT-B detectors is simplified by the use of a mounting base that may be pre-wired to the system, allowing the

detector to be easily installed or removed. The mounting base installation is further simplified by the incorporation of features compatible with drywall fasteners.

Two LEDs on the detector provide a local visual indication of the detector's status:

TABLE 1: DETECTOR LED MODES

	Green LED Red LED
Power-up Blink 10 sec	Blink 10 sec
Normal (standby) Blink	5 sec —
Out of sensitivity — Blink	5 sec
Freeze Trouble — Blink	10 sec
Alarm — Solid

After an initial power-up delay, the red and green LEDs will blink synchronously once every ten seconds. It will take approximately 80 seconds for the detector to finish the power-up cycle (see Table 2).

TABLE 2: POWER-UP SEQUENCE FOR LED STATUS INDICATION*

Condition Duration
Initial LED Status Indication	80 seconds
Initial LED Status Indication(if excessive electrical noise is present)	4 minutes

*Refer to Electrical Specifications for start-up time in conjunction with panel alarm verification.

NOTE: If, during power-up, the detector determines there is excessive electrical noise in the system such as those caused by improper grounding of the system or the conduit, both LEDs will blink for up to 4 minutes before displaying detector status (see Table 2).

After power-up has completed and the detector is functioning normally within its listed sensitivity range, the green LED blinks once every five seconds. If the detector is in need of maintenance because its sensitivity has shifted outside the listed limits, the red LED blinks once every five seconds. When the detector is in the alarm mode, the red LED latches on. The LED indication must not be used in lieu of the tests specified under Testing. In a freeze trouble condition, the red LED will blink once every 10 seconds. (See Table 1.)

To measure the detector's sensitivity, the Series Model SENS-RDR Infrared Sensitivity Reader tool should be used. (See Figure 4.)

Models 2W-B and 2WT-B also include an output that allows an optional Model RA100Z Remote Annunciator to be connected.

MOUNTING

Each i ³ Series detector is supplied with a mounting base that can be mounted:

1. To a single gang box, or
2. To a 31/2-inch or 4-inch octagonal box, or
3. To a 4-inch square box with a plaster ring, or
4. Direct mount or to ceiling using drywall fasteners. (See Figure 2.)

FIGURE 1: MOUNTING OF DETECTOR

Technical line drawing of a mechanical component with no visible text or symbols

S0121-00

The i³ Series heads and bases are keyed so that a 2-wire head will only mount to a 2-wire base, and a 4-wire head will only mount to a 4-wire base. The heads and bases are clearly identified as either 2-wire or 4-wire. When mounting the i³ Series, ensure that the head is mounted to the correct base.

TAMPER-RESISTANT FEATURE

The i ³ Series detectors include a tamper-resistant feature that prevents removal from the mounting base without the use of a tool. To engage the tamper-resistant feature, cut the small plastic tab located on the mounting base (Figure 2), and then install the detector. To remove the detector from the base once it has been made tamper resistant, use a small screwdriver to depress the square tamper release tab, located on the skirt of the mounting base, and turn the detector counterclockwise.

FIGURE 2: TAMPER-RESISTANT FEATURE

DO NOT INSTALL DETECTORS IN THE FOLLOWING AREAS:

• In or near areas where particles of combustion are normally present such as kitchens; in garages (vehicle exhaust); near furnaces, hot water heaters, or gas space heaters.
• In very cold or very hot areas.
• In wet or excessively humid areas, or next to bathrooms with showers.
• In dusty, dirty, or insect-infested areas.
• Near fresh air inlets or returns or excessively drafty areas. Air conditioners, heaters, fans, and fresh air intakes and returns can drive smoke away from the detector.

Consult NFPA 72, the local Authority Having Jurisdiction (AHJ), and/or applicable codes for specific information regarding the spacing and placement of smoke detectors.

CAUTION

Smoke detectors are not to be used with detector guards unless the combination has been evaluated and found suitable for that purpose.

WIRING INSTALLATION GUIDELINES

All wiring must be installed in compliance with the National Electrical Code, applicable state and local codes, and any special requirements of the local Authority Having Jurisdiction.

Proper wire gauges should be used. The conductors used to connect smoke detectors to the alarm control panel and accessory devices should be color-coded to reduce the likelihood of wiring errors. Improper connections can prevent a system from responding properly in the event of a fire.

The screw terminals in the mounting base will accept 14–22 gauge wire. For best system performance, all wiring should be installed in separate grounded conduit; do not mix fire alarm system wiring in the same conduit as any other electrical wiring. Twisted pair may be used to provide additional protection against extraneous electrical interference.

Wire connections are made by stripping approximately 1/4-inch of insulation from the end of the feed wire, inserting it into the proper base terminal, and tightening the screw to secure the wire in place.

TWO-WIRE COMPATIBILITY

System Sensor two-wire smoke detectors are marked with a compatibility identifier located on the label on the back of the product. For two-wire models 2W-B and 2WT-B, connect detectors only to compatible alarm control panels as identified by System Sensor's compatibility chart. This chart contains the current list of detectors and UL Listed compatible control units. A copy of this list is available from System Sensor upon request.

WIRING DIAGRAMS

FIGURE 3A: WIRING DIAGRAM, 2W-B AND 2WT-B

FIGURE 3B: WIRING DIAGRAM, 4W-B AND 4WT-B

2-WIRE I ³ DETECTOR WIRED IN STYLE D CONFIGURATION:

CAUTION

Any 2-wire i ³ smoke detector (2W-B, 2WT-B, 2WTA-B, or 2WTR-B) wired in the Style D initiating device circuit (IDC) configuration requires the use of a 2W-MOD2 module. This is because fire alarm control panels vary by manufacturer on the implementation of Style D circuits. Therefore, the only way to insure proper operation of 2-wire i ³ smoke detectors (2W-B, 2WT-B, 2WTA-B, or 2WTR-B) on Style D IDC's is to use a 2W-MOD2 module. Refer to the 2W-MOD2 installation manual, document D500-46-00, for Style D wiring diagrams. The 2W-MOD2 installation manual may be downloaded from the System Sensor web site at www.systemsensor.com.

INSTALLATION

WARNING

Remove power from alarm control unit or initiating device circuits before installing detectors.

NOTE: To install units so that corresponding LEDs are lined up, refer to the "Green LED" indicator on the base.

1. Wire the mounting base screw terminals per Figure 3a or Figure 3b, as applicable.
2. Place detector on the base and rotate clockwise. The detector will drop into the base and lock into place with a "click".
3. After all detectors have been installed, apply power to the alarm control unit.
4. Test each detector as described in Testing.
5. Reset all the detectors at the alarm control unit.
6. Notify the proper authorities that the system is in operation.

CAUTION

Dust covers are an effective way to limit the entry of dust into the smoke detector sensing chamber. However, they may not completely prevent airborne dust particles from entering the detector. Therefore, System Sensor recommends the removal of detectors before beginning construction or other dust producing activity. When returning the system to service, be sure to remove the dust covers from any detectors that were left in place during construction.

TESTING

Detectors must be tested after installation and following maintenance.

NOTE: Before testing, notify the proper authorities that maintenance is being performed and the system will be temporarily out of service. Disable the zone or system undergoing maintenance to prevent any unwanted alarms.

Ensure proper wiring and power is applied. After power up, allow 80 seconds for the detector to stabilize before testing.

Test 1 Series detectors as follows:

A. TEST SWITCH

1. An opening for the recessed test switch is located on the detector housing (See Figure 4).
2. Insert a small screwdriver or allen wrench (0.18" max.) into the test switch opening; push and hold.
3. If the detector is within the listed sensitivity limits, the detector's red LED should light within five seconds.

FIGURE 4: RECESSED TEST SWITCH OPENING AND SENS-RDR POSITION

B. SMOKE ENTRY TEST

Canned aerosol simulated smoke (canned smoke agent) may be used for smoke entry testing of the smoke detector. Tested and approved aerosol smoke products are:

MANUFACTURER MODEL
Home Safeguard Industries 25S, 30S
SDi CHEK02 and CHEK06
SDi SOLOA4
SDi SMOKESABRE-01

When used properly, the canned smoke agent will cause the smoke detector to go into alarm. Refer to the manufacturer's published instructions for proper use of the canned smoke agent.

CAUTION

Canned aerosol simulated smoke (canned smoke agent) formulas will vary by manufacturer. Misuse or overuse of these products may have long term adverse effects on the smoke detector. Consult the canned smoke agent manufacturer's published instructions for any further warnings or caution statements.

C. DIRECT HEAT METHOD (MODELS 2WT-B AND 4WT-B ONLY)

Using a 1000-1500 watt hair dryer, direct the heat toward either of the thermistors. Hold the heat source about 12 inches from the detector to avoid damage to the plastic.

NOTE: For the above tests, the detector will reset only after the power source has been momentarily interrupted.

If a detector fails any of the above test methods, its wiring should be checked and it should be cleaned as outlined in the Maintenance section. If the detector still fails, it should be replaced.

Notify the proper authorities when the system is back in service.

LOOP VERIFICATION (MODELS 2W-B AND 2WT-B ONLY)

Loop verification is provided by the EZ Walk loop test feature. This feature is for use with i³ Series compatible control panels or the i³ Series 2W-MOD2 module only. The EZ Walk loop test verifies the initiating loop wiring and provides visual status indication at each detector.

1. Ensure proper wiring and power is applied. Wait approximately six minutes before performing EZ Walk test.
2. Place control panel or module in EZ Walk Test mode (refer to panel manufacturer's manual or 2W-MOD2 manual D500-46-00).
3. Observe the LEDs on each detector:

TABLE 3: EZ WALK TEST DETECTOR MODES

	Green LED	Red LED
Proper Operation	Double blink 5 sec	—
Out of Sensitivity	—	Double Blink 5 sec
Freeze Condition	—	Double Blink 10 sec

NOTE: The EZ Walk loop test must not be used instead of alarm testing.

MAINTENANCE

NOTE: Before performing maintenance on the detector, notify the proper authorities that maintenance is being performed and the system will be temporarily out of service. Disable the zone or system undergoing maintenance to prevent any unwanted alarms. Power must be removed from the detector before performing maintenance of any kind.

1. Remove the detector cover by turning counterclockwise. (See Figure 6.)
2. Vacuum the cover or use canned air to remove any dust or debris.
3. Remove the top half of the screen/sensing chamber by lifting straight up (Figure 5).
4. Vacuum or use canned air to remove any dust or particles that are present on both chamber halves.
5. Replace the top half of the screen/sensing chamber by aligning the arrow on the screen/sensing chamber with the arrow on the housing. Press down firmly until the screen/sensing chamber is fully seated.
6. Replace the detector cover by placing it over the screen/sensing chamber and turning it clockwise until it snaps into place.
7. Reinstall the detector and test. (See the Testing section.)
8. Notify the proper authorities when the system is back in service.

FIGURE 5: REMOVING/REPLACING SCREEN/SENSING CHAMBER

Please refer to insert for the Limitations of Fire Alarm Systems

THREE-YEAR LIMITED WARRANTY

System Sensor warrants its enclosed smoke detector to be free from defects in materials and workmanship under normal use and service for a period of three years from date of manufacture. System Sensor makes no other express warranty for this smoke detector. No agent, representative, dealer, or employee of the Company has the authority to increase or alter the obligations or limitations of this Warranty. The Company's obligation of this Warranty shall be limited to the repair or replacement of any part of the smoke detector which is found to be defective in materials or workmanship under normal use and service during the three year period commencing with the date of manufacture. After phoning System Sensor's toll free number 800-SENSOR2 (736-7672) for a Return Authorization number, send defective units postage prepaid to: Honeywell, 12220 Rojas Drive, Suite 700, El Paso TX 79936, USA. Please include a note describing the malfunction and suspected cause of failure. The Company shall not be obligated to repair or replace units which are found to be defective because of damage, unreasonable use, modifications, or alterations occurring after the date of manufacture. In no case shall the Company be liable for any consequential or incidental damages for breach of this or any other Warranty, expressed or implied whatsoever, even if the loss or damage is caused by the Company's negligence or fault. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This Warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

FCC STATEMENT

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

i ³ is a trademark of and System Sensor and Honeywell are registered trademarks of Honeywell International, Inc.