User guide

Glossary
10
Glossary
Alarm Condition
Occurs when devices such as detectors, pull stations, or sprinklers are activated. In a single stage system, this
condition will activate all signalling devices throughout the building. In a two stage system, this condition will activate
an alert signal and the General Alarm timer.
Circuits
Refers to an actual electrical interface and can be classified as initiating (detection), indicating (signal), or relay. The
terms “circuit” and “zone” are often used interchangeably in the fire alarm industry.
Fast Flash Rate
120 flashes per minute is the rate at which an LED will flash to indicate a supervisory alarm.
Indicating Circuit
A circuit in a fire alarm system that is connected to audible or visual signalling devices.
Initiating Circuit
A circuit in a fire alarm system that is connected to detectors, pull stations, or sprinter flow switches.
Latching Circuit
A circuit that, when activated, will cause a condition on the panel that cannot be cleared until the panel is reset.
LED
The light-emitting diodes (LEDs) of the MR-2300 are colored either amber, red, or green. When lit, LEDs provide
information regarding the status of the panel.
Monitor Condition
Occurs when dampers open or close, when supply and return fans are running, etc.
Non-latching Circuit
A circuit that, when activated, will cause a condition on the panel that will be cleared once the circuit is deactivated.
This term is used to describe supervisory and trouble circuits.
Non-Silenceable Circuit
A signal circuit that cannot be silenced by pressing the Signal Silence button.
Relay Circuit
A circuit in a fire alarm system that connects relay devices (e.g. fan damper relays, etc).
Remote Annunciator
A device that visually indicates, either by LCD or LEDs, the floor or zone where the alarm originated.
Silenceable Circuit
A signal circuit that can be silenced by pressing the Signal Silence button.
Supervisory Condition
Occurs when the system detects open circuits, short critics, and grounds. A supervisory condition is one that would
interfere with the operation of
the fire alarm system.
Trouble Condition
Occurs when an abnormal condition such as a problem in the wiring, battery or power circuits exists in the fire alarm
system.