Re: Configuring CO loop on NX8E

["Robert L Bass" <robertbass1@xxxxxxxxxxx>]

> CO Detectors are available with an
> internal "trouble" relay, which can
> be made part of the protective circuit
> so that when the relay opens its
> closed contacts (as when the power
> fails or when the unit fails, etc), a
> trouble signal at the control panel is
> the result.

One problem with wiring the trouble relay on the CO detector into the alarm circuit is that a trouble condition at one detector can
block an alarm at a detector farther from the panel.  You might want to consider using a separate trouble loop, wired to another
zone.  If you have lots of spare zones at the panel but the wiring is already in place, this can be done using only 4 wires.
Connect power for the detector in the usual manner.  If the panel uses a common negative for the zone loops, connect positive to the
appropriate power terminals the negative at the detector to "C" on both the alarm and trouble outputs.  Return "NC" from the alarm
amd trouble relays on the two remaining wires.

--

Regards,
Robert L Bass

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