HPFF12 NAC Expander — P/N 53576:B 11/24/2010 29
NAC Circuit Wiring Installation
2.3.4 HPP31076 Optional Class A (Style Z) Adaptor
The HPP31076 is an optional adaptor to connect four Class A (Style Z) NAC circuits. It mounts
directly onto the terminal block TB4 of the Control circuit board. The adaptor kit includes two
plastic standoffs to provide support. The same gauge wire must be used if two conductors are
connected to the same terminal of any terminal block.
Figure 2.13 Four Class A (Style Z) NACs with HPP31076 Adaptor
NOTE: Only use batteries with a maximum height of 4 inches in applications that require this
adaptor in the standard enclosure. Otherwise, there is insufficient space to connect NAC field
wiring, and a separate NFPA and UL 864 rated enclosure is required.
HPFF812-HPP31076-NACs.wmf
Reference
Resistor
3.9K ohm is
required for
the Class A
adaptor
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
Note: ELR is not required, but
the 3.9kohm reference resistor
is required.
NACs 1 - 3 are wired the same
as NAC4.
Note: Use wire gauge from
12AWG-18AWG.
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.
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