GE Concord 4

Chapter 2: Installation
Concord 4 Installation Manual 15
Note: When using two-wire smoke detectors on zone 8, the two-wire smoke setting
(in program mode) must be turned on before entering the learn sensors menu.
Figure 7: Connecting two- and four-wire smoke detectors
GND ZONE 7 ZONE 8 GND ZONE 7 ZONE 8
Two-wire smoke
detectors
Four-wire smoke
detectors
Panel terminals
Note: The two-wire smoke setting (in program mode) must be on when using four-
wire smoke detectors as shown in Figure 7 above. See “Onboard options - inputs
settings” on page 75 for complete details.
If two-wire smoke detectors 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 16). An output must be used to
activate the polarity reversal relay. This output must be configured for fire alarm
trigger, and siren tracking response (001-11).
Note: Onboard outputs 1 or 2, SnapCard outputs, or output module outputs may be
used to activate the polarity reversal relay.
Maximum alarm current that the panel can source to all external devices is limited to
1 amp. Be sure to include the alarm current for all sounder smoke detectors in the
alarm current calculation.