System Sensor WFD20N 2" Waterflow Detector User Manual

Introduction

This manual provides detailed instructions for the proper installation, operation, and maintenance of the System Sensor WFD20N 2-inch waterflow detector. Please read this manual thoroughly before attempting to install or operate the device to ensure safe and efficient performance.

The System Sensor WFD20N is designed to detect water flow in sprinkler systems, providing an alarm signal when water moves through the pipe. It is an essential component for fire suppression systems.

Safety Information

Always adhere to local codes and regulations when installing and maintaining this device. Installation should only be performed by qualified personnel. Disconnect all power before servicing the unit.

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Product Overview

The image displays the System Sensor WFD20N 2-inch waterflow detector. It features a durable red housing for the electrical components and a robust metal clamp assembly, including a U-bolt, designed for secure attachment to a 2-inch pipe. A white paddle mechanism, visible within the clamp, is responsible for detecting water flow.

• Sensor Technology: Flow Sensor
• Material: Alloy Steel
• Color: Red
• Mounting Type: Wall Mount

Setup and Installation

Pre-Installation Checklist:

• Verify pipe size (2 inches nominal).
• Ensure adequate clearance around the installation point.
• Confirm power supply requirements (Corded Electric).
• Gather necessary tools (wrenches, drill, etc.).

Installation Steps:

1. Select Location: Choose a straight section of pipe, free from obstructions, at least 6 inches from fittings or valves.
2. Drain System: Completely drain the pipe section where the detector will be installed.
3. Drill Hole: Using a hole saw of the specified size (refer to product documentation for exact diameter, typically 2 inches for a 2-inch pipe), drill a hole in the pipe. Deburr the edges.
4. Insert Paddle: Carefully insert the paddle assembly into the drilled hole, ensuring the paddle is oriented correctly with the direction of water flow.
5. Attach Clamp: Position the clamp assembly around the pipe and secure it using the U-bolt and nuts. Tighten the nuts evenly to ensure a snug fit without over-tightening.
6. Wire Connections: Connect the detector's wiring to the alarm control panel according to the provided wiring diagram. Ensure all connections are secure and insulated.
7. Restore System: Slowly refill the sprinkler system, checking for leaks around the detector.

Operating Instructions

The WFD20N waterflow detector operates automatically once installed and connected to a compatible fire alarm control panel. It is designed to detect sustained water flow, typically indicating the activation of a sprinkler head.

Normal Operation:

• In a static water system, the detector remains in a normal, non-alarm state.
• When water flow exceeding a predetermined threshold (e.g., 10 gallons per minute) is sustained for a set delay period (adjustable on some models, typically 5-90 seconds), the detector will activate.
• Upon activation, the detector sends a signal to the connected fire alarm control panel, initiating an alarm.

Testing the Detector:

Regular testing is crucial to ensure proper operation. Refer to NFPA 25 standards for testing frequency.

1. Notify the monitoring station and building occupants before testing.
2. Open the inspector's test valve or a similar flow test connection downstream of the detector.
3. Observe the control panel for an alarm signal within the specified delay time.
4. Close the test valve and verify the detector resets to a normal state.
5. Notify the monitoring station that testing is complete.

Maintenance

The System Sensor WFD20N waterflow detector requires minimal maintenance. Regular inspections and testing are the primary forms of upkeep.

Routine Checks:

• Visual Inspection: Periodically inspect the detector for any signs of physical damage, corrosion, or loose connections. Ensure the housing is securely closed.
• Environmental Conditions: Verify that the operating environment remains within the specified temperature and humidity ranges.
• Testing: Conduct functional tests as per local codes and NFPA 25 standards (e.g., quarterly or annually).

Cleaning:

If the exterior of the detector becomes dirty, wipe it with a clean, damp cloth. Do not use abrasive cleaners or solvents.

Servicing:

Any internal servicing or repair should only be performed by qualified fire alarm technicians. Do not attempt to disassemble the sealed electrical housing.

Troubleshooting

This section provides guidance for common issues encountered with the WFD20N waterflow detector. For problems not listed here, contact System Sensor technical support or a qualified fire alarm professional.

Specifications

Warranty and Support

For warranty information and technical support, please contact System Sensor directly or refer to their official website. It is recommended to have the model number (WFD20N) and date of purchase available when seeking support.

System Sensor Official Website: www.systemsensor.com