4WTR-B - Smoke detector System Sensor - Free user manual and instructions
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| Product Type | Photoelectric Smoke Detector (4-Wire) |
| Model | 4WTR-B |
| Brand | System Sensor |
| Operating Voltage | 24 VDC (nominal) |
| Standby Current | 50 µA (max) |
| Alarm Current | 90 mA (max) |
| Sensitivity | 0.5% to 4% per foot obscuration (selectable) |
| Dimensions | 4.1 in (104 mm) diameter x 2.0 in (51 mm) height |
| Weight | 7.0 oz (198 g) |
| Operating Temperature | 32°F to 120°F (0°C to 49°C) |
| Humidity Range | 10% to 93% non-condensing |
| Main Functions | Photoelectric sensing, alarm output, remote signaling, sensitivity test |
| Maintenance | Clean with soft brush or compressed air; test monthly |
| Safety Approvals | UL Listed, CSFM, FM Approved |
| Spare Parts | Detector head, base (consult manual for part numbers) |
| Wiring | 4-wire (power, alarm, remote indicator) |
| Compatibility | Compatible with System Sensor bases and fire alarm panels |
Frequently Asked Questions - 4WTR-B System Sensor
How do I install the 4WTR-B smoke detector?
Mount the base securely to a junction box, connect the 4-wire circuit (power, alarm, and remote indicator) per the wiring diagram, and twist the detector head onto the base until it locks. Ensure polarity is correct.
What is the recommended testing procedure?
Use a magnet or test button (if available) to simulate smoke. The detector should alarm within 30 seconds. For sensitivity test, use a calibrated aerosol or test equipment. Test monthly after installation.
How often should I clean the detector?
Clean every 6 months or when dusty. Use a soft brush or compressed air to remove debris from the sensing chamber. Do not use water or solvents.
Can the 4WTR-B be used with any fire alarm panel?
It is designed for use with 24 VDC fire alarm panels that support 4-wire detectors. Consult your panel's compatibility list or use System Sensor bases for best results.
What does the remote indicator do?
The remote indicator terminal provides a signal to a remote LED or annunciator, allowing you to see the alarm status from a distance. Connect to a compatible device.
How do I replace the detector head?
Turn off power to the detector circuit. Gently twist the head counterclockwise and pull it off the base. Attach the new head by aligning the pins and twisting clockwise until it clicks.
What is the operating temperature range?
The 4WTR-B operates in temperatures from 32°F to 120°F (0°C to 49°C). Avoid installing in areas that exceed these limits.
How do I set the sensitivity level?
Sensitivity is set via DIP switches on the detector. Refer to the manual for switch positions corresponding to 0.5%, 1%, 2%, or 4% per foot obscuration.
What do I do if the detector goes into alarm frequently?
Check for environmental factors like steam, dust, or insects. Clean the detector and ensure it is not placed near kitchens or bathrooms. If false alarms persist, consider relocating the detector.
Is the 4WTR-B compatible with wireless systems?
No, it is a wired 4-wire detector. For wireless options, see System Sensor's wireless product line. The 4WTR-B requires a physical connection to a control panel.
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