Installation Manual Instruction Manual

Chapter 2: Installation
16 Concord 4 Installation Manual
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 78 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 17). 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.