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PFC 2000RC • 5403521-REV N• 3/03
RELEASING CIRCUIT
One Class B circuit
Circuit is power limited
Circuit is rated 24VDC at 1 Amp continuous, 3 Amps intermittent
Reverses polarity to release extinguishing agent
Operates at the end of the pre-discharge timer period (or upon actuation of a manual alarm if this mode is selected for the
manual alarm circuit.)
Minimum battery voltage that will maintain 85 - 100% of solenoid voltage = 22.5 Volts
Maximum allowable line resistance = 2 ÷ CURRENT (IN RELEASE MODE)
Maximum short circuit loop current is 8 mA (in standby condition)
Normal standby loop current is 3 mA
End-Of-Line resistor is 5.1k ohms
ABORT CIRCUIT
One Class B switch circuit
Circuit is power limited
Maximum loop resistance is 100 ohms
Maximum short circuit loop current is 8 mA
Normal standby loop current is 3 mA.
End-Of-Line resistor is 5.1k ohms
Two switch selectable modes of operation:
Mode 1 - The release of the extinguishing agent is delayed as long as the abort switch is activated. Deactivation of the
abort switch will result in the release of the extinguishing agent within 10 seconds if the 60 second delay period
has elapsed.
Mode 2 - (IRI Mode) If the abort switch is actuated prior to the actuation of a second alarm, the pre-discharge timer will
not start. If the abort switch is restored after the second alarm, subsequent actuation of the abort switch will not
interrupt the operation of the pre-discharge timer. Actuation of the abort switch after a second alarm will not
interrupt operation of the pre-discharge timer.
PRE-DISCHARGE TIMER
Switch selectable from 0 to 60 seconds in 10 second increments, with 4 switch selectable modes of operation for the smoke/heat
detector circuits (the predischarge circuit, also switch selectable, to be 0 or 30 seconds upon activation of the manual circuit):
Mode 1 Single Zone
- Actuation of one or more detectors will create an alarm condition and start the pre-discharge timer (this
mode is usually used with heat detectors).
Mode 2 Cross Zone
- Actuation of one or more detectors in any one zone will create an alarm condition. Actuation of one or
more detectors in both zones, in addition to creating an alarm condition will start the pre-discharge timer (this mode is usually
used with smoke detectors).
Mode 3 Sequential
- Actuation of one detector in any one zone will create an alarm condition. Actuation of a second detector
in the same zone will start the pre-discharge timer (this mode is usually used with smoke detectors).
Mode 4 Sequential or Cross Zone
- Actuation of one detector in any zone will create an alarm condition. Actuation of two
detectors in the same zone, or one detector in each zone will start the pre-discharge timer (this mode is usually used with smoke
detectors).
Manual Circuit Activation
- Activation of one or more devices on the Manual Device Circuit will create an alarm condition.
The output of this circuit is switch selectable to start a 30 second pre-discharge timer or to immediately activate the releasing
circuit. Activation of this circuit overrides abort.
DISCHARGE TIMER
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