Tyco 4100U installation manual Appendix C Checking System Wiring, Notes, Continued on next page

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

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C-1