Installation Guide
FPP-RNAC-8A-4C | Operation and Installation Guide | 
14  Bosch Security Systems, Inc. | 8/09 | F01U025431-02
3.3  Option Bus Connections 
The option bus (if used) runs to the terminals labeled 
Y, G, B, and R (refer to 
Figure 7). 
You can use the option bus connection with a Bosch 
Security Systems, Inc. FPA-1000 or FPD-7024 Fire 
Alarm Control/Communicator. The FPP-RNAC-8A-4C 
is a new option module type that can indicate specific 
trouble conditions back to the control panel, such as 
AC, battery, and so on. 
Refer to Section 
4.0 DIP Switch and Option Bus 
Settings
 on page 17 to set the address on the 
FPP-RNAC-8A-4C for use with the option bus. 
Refer to the FPA-1000-UL Installation and Operation 
Guide (P/N F01U075420) or the FPD-7024 Operation 
and Installation Guide (P/N F01U008458) for wiring 
requirements. 
Figure 7:  Wiring the Option Bus 
OPTION BUS
R Y G B
GROUND FAULT
OPEN = DISABLE
CLOSE = ENABLE
1
2
3
4
5
1  Option Bus 
2  Red wire 
3  Yellow wire 
4  Green wire 
5  Black wire 
3.4  NAC Input Connections 
Two inputs can be used with 12 V or 24 V polarity 
reversal outputs from a conventional control panel 
that conform to NFPA 72, Class A or B (used instead 
of the option bus connection). Refer to the control 
panel’s compatibility information. 
Polarity reversal on Input 1 activates NAC Outputs 1 
and 2; Input 2 activates NAC Outputs 3 and 4. DIP 
switch settings allow NAC Input 1 to control all four 
outputs (refer to Section 
4.0 DIP Switch and Option 
Bus Settings
 on page 17). 
If the control panel detects a trouble condition on 
either set of outputs, the appropriate EOL device is 
disconnected from the reversal loop. These inputs are 
electrically isolated from the controlling section of the 
board. 
The FPP-RNAC-8A-4C can be placed anywhere on 
an FACP’s NAC circuit. 
Refer to 
Figure 8 for wiring details. 
Connect either the option bus or the NAC 
Input terminals on the FPP RNAC 8A-4C 
to the FACP. 
Do not connect both. 
Figure 8:  Wiring the NAC Inputs 
T
R
O
U
B
L
E
I
N
P
U
T
1
I
N
P
U
T
2
EOL
REF
OUT_2 +
IN_2 +
IN_2 -
OUT_2 -
OUT_1 +
IN_1 +
IN_1 -
OUT_1 -
N
N
1
2
3
4
5
6
7
8
1  Class A 
2  Return to FACP NAC output 
3  From FACP NAC output 
4  Return to FACP NAC output 
5  To next device or EOL 
6  From FACP NAC output 
7  To next device or EOL 
8  Class B 
The EOL resistor value depends on the 
conventional panel. Select a value from 
1 k to 20 k. 
When connecting to the FPD-7024 using 
the option bus, all FPP-RNAC-8A-4C 
power supplies must be on the same 
zone. 










