GE Security Concord 4 Installation Manual page 31

Figure 8. Polarity reversal module
Output 2 +12V
Connecting 4-wire smoke detectors
Terminal 24 provides power to 4-wire smoke detectors that latch and remain in the alarm state until power
turns off, then restores to the detector. The panel provides this power interruption from terminal 24 (2W SMK
ZONE 8) only when the 2-wire smoke option is on.
Note: The 2-wire smoke feature must be on for smoke detectors to reset after canceling a fire alarm.
Table 7 describes the minimum available panel power. Use only 4-wire smoke detectors that operate at these
power limits. Connect up to five GE smoke detectors input as shown in Figure 7.
Table 7. Minimum available panel power
Minimum voltage
8.3 VDC
8.1 VDC
7.6 VDC
7.1 VDC
2W SMK
GND Zone 8
Polarity reversal module
First detector
Part # 406-03
Maximum current available
Up to 30 mA total (combined alarm) current
Up to 40 mA total (combined alarm) current
Up to 60 mA total (combined alarm) current
Up to 80 mA total (combined alarm) current
2K OHM
Last detector 49-454
EOL resistor
521NCSXT
Chapter 2 21
Installation
521NCSXT