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Page 8
3/97 P/N 33120C © 1997 Radionics
Auxiliary Power
Terminal 7 and 8
(+Aux)
The continuous current draw for powered devices con-
nected to terminal 7, including keypads, must not exceed
500mA (140mA for fire and combined fire/burglary
systems). Devices powered from this output must operate
over a range of 10.2 VDC to 13.9 VDC.
You must use a minimum of five feet (22 AWG) of wire
when connecting devices mounted outside the
enclosure to terminal 7
. A short on terminal 7 within five
feet of the panel prevents the panel from operating
correctly.
Checking Continuous Current Draw
The panel allows you to check current draw using the
keypad. For more information about this and other keypad
diagnostic features, see the
D2812 Keypad Diagnostics
manual (33124).
External Relays
Terminals 9 and 10
(Ext1 and Ext2)
You can program the External Relay terminals (terminals 9
and 10) to provide outputs for two external relays. Review
the
RELAYS Group
in the
D2812 Program Entry Guide
for
a description of the relay functions available.
Connect a D133 (or D134) Relay Module for each of the
external relay outputs you intend to use. Figure 4 shows
the connections (the D134 combines the functionality of
two D133 relays in a single enclosure.).
Warning
: Do not connect wiring for external relays
directly to terminals 9 and 10. Install D133 (or D134)
modules connected to terminals 9 and 10 in the enclosure
with the panel as shown in Figure 1.
Connect the Points
On-Board Points
Point 1
Terminals 11 and 12
(1+ and 1-)
Point 1 on the D2812 is a powered, supervised point.
The panel monitors the Point 1 sensor loop for normal,
shorted, or open conditions. Programming determines how
the panel responds to those conditions. See the
D2812
Program Entry Guide
.
Terminal 11 provides positive voltage to 2-wire detection
devices. Terminal 12, the loop return (-), is isolated from
earth ground.
The Keypad Reset function interrupts power to this sensor
loop to reset smoke detectors.
Use a 2k
Ω
end-of-line resistor for Point 1. See Figure 5 on
page 9 for point wiring.
Connecting Two-wire Smoke Detectors to Point 1
:
Connect up to 15 Radionics D262 two-wire smoke
detectors to Point 1. Refer to the
Technogram: Smoke
Detectors Compatible with the D2812
(P/N 33123), for a
complete list of detectors compatible with the D2812.
Do not mix compatible two-wire smoke detector types on
this loop.
Four-wire Smoke Detectors
Connect any number (limited by available power and the
Authority Having Jurisdiction) of 12 VDC four-wire smoke
detectors to any supervised point. Install a suitable power
supervision device according to the manufacturers
instructions. Route the power for the detectors through a
D133 (or D134) Relay Module. The relay module must be
connected to one of the panels external relay outputs
programmed for the reset function. See
RELAYS
in the
D2812 Program Entry Guide
for programming instructions.
Heat Detectors and Other Dry Contact Initiating
Devices
Connect any number (limited by the Authority Having
Jurisdiction).
Burglary Devices
Connect any number (limited by available power) of
burglary devices to any point. Do not combine fire detec-
tion and burglary devices on the same point.
Figure 4: External Relay Wiring
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