Installation Manual Instruction Manual

Chapter 2: Installation

Concord 4 Installation Manual 17

Figure 8: Polarity reversal module

OUT 2

+12V GND

ZONE 8

2W-SMK

Polarity reversal

module (part # 405-03)

521NCSXT

Four-wire smoke detectors

Terminal 24 provides power to four-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 two-wire smoke option is on.

Note: The two-wire smoke feature must be on for smoke detectors to reset after

canceling a fire alarm.

Table 7 below describes the minimum available panel power. Use only four-wire

smoke detectors that operate at these power limits. Connect up to five smoke

detectors as shown in Figure 7 on page 16.

Table 7: Minimum available panel power

Minimum voltage

Maximum current available

8.3 VDC

Up to 30 mA total (combined alarm) current

8.1 VDC

Up to 40 mA total (combined alarm) current

7.6 VDC

Up to 60 mA total (combined alarm) current

7.1 VDC

Up to 80 mA total (combined alarm) current