Bosch D9412GV4 Installation And Operation Manual page 31

D9412GV4/D7412GV4/D7212GV4 | Installation and Operation Guide | 6.0
Relays are assigned a relay type, (Fire Bell, for
example) when they are assigned to an area.
Relays can be assigned to one or more areas.
The Bosch Security Systems, Inc. defaults set Relay
A (Terminal 6) as a Steady Alarm Bell output,
Relay B (Terminal 7) as a Pulsed Fire Bell output,
and Relay C (Terminal 8) as a Verification or
Reset output for smoke detectors. The
D9412GV4/D7412GV4/D7212GV4 Program Entry
Guide (P/N: F01U218312) contains complete
instructions for programming relays. Refer to
Sections 6.4.2 Terminals 6 and 7, 6.4.3 Fire System
Power Formula, and 6.4.4 Terminal 8 on page 31
for descriptions of the functions of each terminal.
Refer to the Bell Parameters section of the
program to set the Fire Bell, Alarm Bell output
responses for relays. Four annunciation patterns
are available: Steady, Pulsed, California Standard,
and Temporal Code 3.
Voltage Output at Terminals 6, 7, and 8
If Terminals 6, 7, and 8 do not provide the
expected output, check:
 Programming for Relays A, B, and C in the
relays section of the program.

Bell Parameters section of the program to
confirm that the Alarm and Fire Bell
responses are programmed for the expected
duration and pattern.

Point Assignments section to confirm that
each point is programmed for the expected
local response.
6.4.2 Terminals 6 and 7
When activated, Terminals 6 (Relay A) and 7
(Relay B), provide positive (+) 12.0 VDC Nominal
power output. Use the power at Terminals 6 and
7 to power bells, siren drivers, piezoelectric fire
sounders, electronic horns, or other devices.
Programming determines the format of the
output and the conditions that activate it. One
self-resetting circuit breaker protects Terminals
6, 7, and 8 against shorts. When using Relay A or
Relay B to activate notification appliance circuits
in UL Listed fire alarm applications, install a
D192G Indicating Circuit Module.
Power Restricted for Fire and Combined Fire and
Burglary Systems: Fire systems are prohibited
from using the battery for determining alarm
power. Use the fire system power formula that
follows to calculate the current available for fire
and combined fire and burglary systems.
Bosch Security Systems, Inc. | 3/12 | F01U266054-01
6.4.3 Fire System Power Formula
To calculate the current available at Terminals 6
and 7 for fire and combined fire and burglary
systems:
1. Add together the current draws for all devices
connected to Terminals 3, 8, 24, and 32, and
the accessory connector. This is the total
current required for the normal standby
condition (NSC).
2. The current available for NSC is 1.4 A.
Subtract the NSC current required calculated
in Step 1 from the NSC current available, 1.4
A. The difference is the alarm current
available for Terminals 6 and 7.
In formula format:
1.4 A  NSC current
required (Step 1)
Refer to the D9412GV4/D7412GV4/D7212GV4
Approved Applications Compliance Guide (P/N:
F01U201525) for module or accessory current
requirements.
6.4.4 Terminal 8
Terminal 8 provides continuous positive (+) 12.0
VDC Nominal power. Relay C interrupts the
power at Terminal 8 when activated. Use
Terminal 8 to power smoke detectors or other
devices that are reset by interrupting power. One
self-resetting circuit breaker protects Terminals
6, 7, and 8 against shorts.
Verification and Reset Relay
The default program sets Relay C (Terminal 8) as
a verification and reset relay. Refer to Relay
Parameters and Point Assignments in the
D9412GV4/D7412GV4/D7212GV4 Program Entry
Guide (P/N: F01U218312) for instructions on
programming verification and reset relays and
points.
Performing a sensor reset at a keypad produces a
five-sec relay activation of verification and reset
relays. The control panel ignores verification and
resettable points during the five sec.
Power Outputs
=
Alarm current
available
31