8
PFC 2000RC • 5403521-REV N• 3/03
trouble.
ALARM INITIATING DEVICE CIRCUITS
Two circuits for smoke and/or heat detectors, maximum detector load 2.5mA
Circuits are switch selectable for Style D or B (Class A or B)
Circuits are latching and power limited
Maximum line resistance is 25 ohms
Maximum short circuit loop current is 80 mA
Maximum open circuit loop voltage is 26.4 Volts with 132 Volts AC input
Minimum voltage at end of line resistor is 16 Volts with 20.4 Volts DC input
Minimum loop current required for alarm is 15 mA
Normal standby loop current is 5 mA
Maximum impedance on loop for alarm is 1500 ohms
Maximum impedance on loop for 2nd alarm (when a sequential mode is selected) 560 ohms
End of line resistor is 5.1k ohms
Minimum time to reset is 3 seconds
MANUAL INITIATING DEVICE CIRCUIT
One circuit for manual stations, switch selectable Style D or B (Class A or B)
Circuit is latching and power limited
Maximum loop resistance is 100 ohms
Maximum short circuit loop current is 8 mA
Minimum line current required for alarm is 5 mA
Normal standby loop current is 3 mA
End of line resistor is 5.1k ohms
Minimum time to reset is 3 seconds
SUPERVISORY INITIATING DEVICE CIRCUIT
One Class B circuit
Circuit is non-latching and power limited
Maximum line 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
Current increase causes a supervisory signal and system trouble
Current decrease causes a supervisory trouble and system trouble
INDICATING APPLIANCE CIRCUITS
Two Style Y (Class B) circuits that reverse polarity on alarm
Circuits are power limited
Each circuit rated 24 Volt DC 1 Amp maximum
Normal standby loop current is 3 mA
End of line resistor is 5.1k ohms
Three switch selectable modes of operation:
Mode 1 -
Steady on first alarm, pulsing upon activation of predischarge timer.
Mode 2 -
Pulsing on first alarm, steady upon activation of predischarge timer.
Mode 3 -
One circuit activated on first alarm. Second circuit activated upon activation of predischarge timer.
Note:
If the predischarge timer is set to 0 the change in operation described above will occur at the time of release of
the extinguishing agent.
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