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HPFF12 NAC Expander — P/N 53576:B 11/24/2010 27

NAC Circuit Wiring Installation

2.3.2 Two NACs Configured for Class A (Style Z)

Figure 2.11 shows two NACs configured for Class A (Style Z).

Figure 2.11 Two NACs in Class A (Style Z)

NAC 2

HPFF12NACClassA.wmf

Horn Strobe

Alarm Polarity

Shown

• Trouble on NAC1

will illuminate

LED1 SIG1 TRBL and

LED2 SIG2 TRBL

• Trouble on NAC2

will illuminate

LED3 SIG3 TRBL

and LED4 SIG4 TRBL

Note: NAC 2 in Class A;

no ELR required.

Note: NAC 1 Class A

wired same as NAC2.

NAC 1

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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