Appendix C

Checking System Wiring

Overview

Using the Volt/ Ohm Meter

This appendix contains instructions on how to use a volt/ohm meter to check system wiring.

When using the volt/ohm meter to check each circuit, make sure to adhere to the notes and instructions below.

A. No Voltage

B. Open Circuit

Notes:

•Ensure that no power is applied to the 4100U fire alarm panel and that all wiring is properly connected (terminal blocks, LED/switch module ribbon cables, etc.).

•Use the earth stud in the control panel for all measurements to ground.

•Each circuit must test free of all grounds and extraneous voltages.

Use the volt/ohm meter as described in the steps below to check each circuit type.

1.At the control panel, locate wires from each initiating device or indicating appliance circuit.

2.Check each circuit for extraneous voltage by setting the volt/ohm meter to 300 VAC. Place the meter probes so that the black probe is on the “-” wire and the red probe is on the “+” wire. Meter readings must show 0 volts (see Figure D- 1A).

3.Set the volt/ohm meter to 60 VDC and repeat step 2. The meter must read 0 volts (see Figure D-1A).

4.Set the volt/ohm meter to OHMS x 10 and place the meter probes as described in step 2. Check the circuits using the resistance measurements in Table D-1. Locate and correct any abnormal conditions at this time. Note: If the reading indicates an open circuit in an initiating circuit, make sure the smoke detector heads are properly mounted and seated. The circuit may be open if smoke detector power is not present, and if separately powered 4-wire devices are used.

5.Check all other system wiring to verify that each circuit is free of grounds and extraneous voltages.

C. Short Circuit

Figure D-1. Volt/Ohm Meter Readings

Continued on next page

C-1

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Tyco 4100U installation manual Appendix C Checking System Wiring, Figure D-1. Volt/Ohm Meter Readings
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4100U specifications

The Tyco 4100 series, which includes the 4100U, 4120, and 4020 models, represents a significant evolution in fire alarm and detection systems. These systems are designed to meet the needs of commercial, industrial, and institutional environments, ensuring reliable safety and compliance with the latest regulatory standards.

One of the primary features of the Tyco 4100 series is its modular design. This allows for easy expansion and customization to meet diverse application requirements. The systems support a wide range of detectors, initiating devices, and notification appliances, providing flexibility for different building layouts and fire protection needs.

The 4100U model is particularly noted for its powerful processing capabilities, utilizing advanced digital technology to enhance the speed and accuracy of fire detection. It includes sophisticated algorithms that optimize response times and reduce false alarms, ensuring that the system is both responsive and reliable during emergencies.

The 4120 model is tailored for larger facilities, incorporating advanced networking features that enable communication between multiple control panels. This interconnectedness is crucial for managing complex building systems, allowing for centralized monitoring and control. It integrates with a variety of life-safety systems and can be configured to accommodate a vast number of addressable points, making it ideal for expansive installations.

The 4020 model serves as a cost-effective solution for smaller establishments while maintaining essential functionalities. It focuses on delivering essential fire alarm capabilities without compromising on performance. Despite its more compact design, the 4020 still offers support for numerous devices and can be integrated into larger systems if needed.

All models in the 4100 series leverage modern communication technologies, offering network integration capabilities that enhance their usability. They support various communication protocols, including Ethernet, which facilitates remote monitoring and maintenance options via web-based interfaces. This ensures that system administrators can manage alerts and notifications from anywhere, streamlining incident response.

In summary, the Tyco 4100 series, featuring the 4100U, 4120, and 4020 models, stands out for its adaptability, technological advancements, and versatility. Their robust design caters effectively to diverse environments, making them a preferred choice for fire alarm and safety solutions in various sectors. Companies can rely on these systems not only for compliance but also for enhanced safety and operational efficiency.
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