GE Security Concord 4 Installation Manual page 30

20 Concord 4
Installation Manual
Figure 7. Connecting 2- and 4-wire smoke detectors to the panel
Panel terminals
2-wire smoke
detectors
Note: The 2-wire smoke setting (in program mode) must be on when using four-wire smoke detectors as shown in Figure 7.
See Onboard options - inputs settings
If 2-wire smokes with built-in sounders are used (521INCSXT), a polarity reversal relay (model 405-03) may
be used to activate the sounders on all smoke detectors during a fire alarm. See Figure 8 on page 21. An output
must be used to activate the polarity reversal relay. This output must be configured for fire alarm trigger, and
siren tracking response (001-10).
Note: Onboard outputs 1 or 2, SnapCard outputs, or output module outputs may be used to activate the polarity reversal
relay.
Maximum alarm current is limited to 1.0 A that the panel can source to all external devices. Be sure to include
the alarm current for all sounder smoke detectors in the alarm current calculation.
on page 99 for complete details.
4-wire smoke
detectors