Bosch D279A Specsheet

Intrusion Alarm Systems | D279A Independent Zone Control

D279A Independent Zone Control

www.boschsecurity.com

u Permits independent arming and disarming of a

single control panel zone or point

u Four-digit, user-programmable passcode

u Panic function

The D279A Independent Zone Control arms and
disarms a single control panel zone or point separately
from the rest of the system. It features a user­programmable four-digit pass code for arming and
disarming, and a panic function. Entry and exit delay
times allow users to locate the D279A Independent
Zone Control inside the protected area. The D279A
initiates the opening and closing of reports for each
zone, assuming that the control panels are
programmed for opening and closing reports and
compatible with the device.
The D279A includes a ten-wire cable for interfacing
with a control panel (four wires), protective loops
(three wires), and on-board relay (three wires).

Notice

The D279A is not supervised from the control
panel; UL Listed applications require arming
device supervision.

System overview

The D279A arms or disarms a single zone on a
compatible control panel separately from the rest of
the system. This zone is divided into two loops: one
delayed and one instant. Sensors can be wired to

u Preprogrammed entry and exit delay times

u Individual annunciation of delayed and instant loop

status

these loops in series (normally-closed) or in parallel
(normally open). Both loops must be normal before
the D279A can be armed. When the delayed and
instant loops return to normal after an alarm, the
D279A is ready to detect another alarm.

Installation/configuration notes

Compatibility Information

Control Panels D2212, D2412, D4112, D6112, D7212B1,

D7412G, D7412GV2, D8112, D9112B1,
D9412G, and D9412GV2

Mounting Considerations

The D279A mounts directly onto a wall, installs in a
flush mount unit, or attaches to a D55 Desk Stand.
Avoid mounting the D279A in a location exposed to
direct sunlight. Direct sunlight makes the LEDs less
visible and intense heat can damage the enclosure and
electrical components.

Connection Considerations

The wiring between the D279A and the control panel
is not supervised for trouble conditions. The wiring
between the D279A and remote sensing devices is
supervised with end-of-line (EOL) resistors.

2 | D279A Independent Zone Control

Technical specifications

Connections

Connections: 1.2 mm (22 AWG) or heavier gauge

wire to connect the loops and control
panel to the ten flying leads

Resistance: 5 Ω maximum resistance on common

(four wires for common can be used, if
needed, to reduce resistance)
20 Ω maximum resistance on all other
runs between the D279A and the
control panel

Environmental Considerations

Relative Humidity: 5% to 85% at +30°C (+86°F)

non-condensing

Temperature (Operating): 0°C to +50°C (+32°F to +122°F)

Properties

Dimensions: 11.58 cm x 20.7 cm x 2.07 cm

(4.56 in. x 8.15 in. x 0.816 in.)

Power Requirements

Current: Keypad idle: 45 mA to 55 mA

Keypad lit, buzzer on, both loops
faulted, and relay activated: 104 mA

Voltage (Operating): Nominal 12 VDC

Auxiliary Relay Rating: Form C contacts, 12 VDC, 2 A

maximum

Trademarks

Plexiglas® is a registered trademark of Arkema.

Ordering information

D279A Independent Zone Control

Off-white case. Arms and disarms a single control
panel zone or point separately from the system.

Order number D279A

Accessories

D54B Brass Flush‑mount Kit

Back box and polished brass faceplate.

Order number D54B

D54C Stainless Steel Flush‑mount Kit

Back box and stainless steel faceplate.

Order number D54C

D55 Keypad Desk Stand

Portable desk stand in smoke colored Plexiglas.

Order number D55

D57 Single‑gang Surface Mount Conduit Box

Surface mount box.

Order number D57