26
HPFF12 NAC Expander —
P/N 53576:B 11/24/2010
Installation
NAC Circuit Wiring
2.3
NAC Circuit Wiring
For wiring sizes, see Section 6.5, “NAC Circuit Loop Wiring Requirements”.
2.3.1 Four NACs Configured for Class B (Style Y)
Figure 2.10 shows four NACs configured for Class B (Style Y).
Figure 2.10 Four NACs in Class B (Style Y)
Reference Resistor
HP
FF1
2NA
CCl
assB
.wmf
Horn Strobe
Horn Strobe
Horn Strobe
EOL same as
Reference Resistor
Alarm Polarity Shown
• Trouble on NAC1
will illuminate
LED1 SIG1 TRBL.
• Trouble on NAC2
will illuminate
LED2 SIG2 TRBL.
• Trouble on NAC3
will illuminate
LED3 SIG3 TRBL.
• Trouble on NAC4
will illuminate
LED4 SIG4 TRBL.
NAC 4
NAC 3
NACs 1 - 3 are wired the same as NAC4 and use
ELR the same as Reference Resistor.
NAC 1 NAC 2
NOTE:
1. Typical ELR's for new installations can be 3.9k or 4.7k ohm.
2. The same gauge wire must be used if two conductors are connected to the same terminal of
any terminal block.
3. Do not complete a continuous circuit around the screw terminal. There must be two separate
wires on either side of the screw at the terminal block. “T-tapping” is absolutely NOT ALLOWED.