C-1
{xe "wiring: troubleshooting"}{xe "troubleshooting: wiring"}{xe "volt-Ohm meter
usage"}
This appendix contains instructions on how to use a volt/ohm meter to check field wiring
to the 4100ES.
When using the volt/ohm meter to check each circuit, make sure to adhere to the notes
and instructions below.
Notes:
Ensure that no power is applied to the 4100ES fire alarm panel and that all
internal panel wiring is properly connected (terminal blocks, LED/switch
module ribbon cables, etc).
Use the earth stud in the control panel as the earth connection for all
measurements to ground.
Disconnect the wires for each circuit from the 4100ES terminals before
testing it.
Measuring resistances between 4100ES terminals or to ground will give
meaningless results.
Use the volt/ohm meter as described in the steps below to check each circuit type:
1. At the 4100ES panel, disconnect the wires for each circuit from the terminals
before testing it. If it is a Class A (loop) type of circuit, e.g., IDNet loop, ensure
that both ends of the loop are disconnected from the 4100ES.
2. Check each circuit for extraneous voltage by setting the volt/ohm meter to a
300VAC range. 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 less than 1V.
3. Set the volt/ohm meter to a 60VDC range and repeat step 2. The meter must
read less than 0.5V.
4. Set the volt/ohm meter to OHMS 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 a detector circuit, make sure the
smoke detector heads are properly mounted and seated. The circuit may also be
open if smoke detector power is not present, and if separately powered 4-wire
devices are used.
5. Repeat steps 1-4 for all field wiring, to verify that each circuit is free of grounds
and extraneous voltages.
Continued on next page
Appendix C
Checking System Wiring
Overview
Using the Volt/
Ohm Meter
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