P/N 315-034904FA-3
PAGE 2 OF 2
Figure 3
8709 Wiring Diagram - Style 4 (Class B) Operation
1. All wiring must comply with
national and local codes.
2. In order to provide adequate
protection, it is recom-
mended that you do not
install more than 20 devices
on a single 8709.
3. Wire size: 18 to 14 AWG.
4. The total wire resistance
(both wires) between 8709s
cannot exceed 20 ohms.
5. Do not install more than
fifteen 8709s per Address-
able Device Circuit.
6. All circuits are supervised.
7. Refer to the control unit’s
Owner’s Manual for the list
of compatible devices.
8. All terminals are power
limited
.
LINE 1
LINE 2
SEE CONTROL UNIT OWNER’S MANUAL
FOR COMPATIBLE ADDRESSABLE DEVICES
FROM ADDRESSABLE DEVICE
CIRCUIT OF A COMPATIBLE
CONTROL UNIT OR PREVIOUS
ADDRESSABLE DEVICE
ADDRESSABLE DEVICE CIRCUIT
IN
IN OUT OUT EARTH
IN
IN OUT OUT EARTH
IN
IN OUT OUT EARTH
WIRING
The 8709 is a polarity insensitive module. Refer to Figure 1 for the location of the two input terminals and
two output terminals. Line 1 and Line 2 can be either line of the loop.
The 8709 may be used in two circuit configurations as follows:
Style 4 Operation
(See Figure 3) In Style 4 (Class B) wiring, each 8709 isolates a branch or section of the addressable
device circuit. Note that a short on the main branch causes the entire loop to fail. To prevent this, mount
the 8709s at the control unit enclosure and run each branch independently.
Style 6 Operation
(See Figure 4) In Style 6 (Class A) wiring, the 8709s are wired in series with the addressable device circuit
wiring. This results in a single continuous loop. If any group in the loop has a short, that group is lost and a
Class A circuit failure results.
1. All wiring must comply with
national and local codes.
2. In order to provide adequate
protection, it is recom-
mended that you do not
install more than 20 devices
on a single 8709.
3. Wire size: 18 to 14 AWG.
4. The total wire resistance
(both wires) between 8709s
cannot exceed 20 ohms.
5. Do not install more than
fifteen 8709s per Address-
able Device Circuit.
6. All circuits are supervised.
7. Refer to the control unit’s
Owner’s Manual for the list
of compatible devices.
8. All terminals are power
limited.
SEE CONTROL UNIT OWNER’S MANUAL
FOR COMPATIBLE ADDRESSABLE DEVICES
ADDRESSABLE DEVICE CIRCUIT
TO ADDRESSABLE DEVICE
CIRCUIT IN TERMINALS
TO ADDRESSABLE DEVICE
CIRCUIT OUT TERMINALS
INSIDE ENCLOSURE
LINE 1
LINE 2
LINE 2
LINE 1
IN
IN OUT OUT
IN
IN
OUT
OUT
EARTH
EARTH
IN
IN
OUT
OUT
EARTH
IN
IN
OUT
OUT
EARTH
IN
IN OUT OUT EARTH
IN
IN OUT OUT EARTH
Figure 4
8709 Wiring Diagram - Style 6 (Class A) Operation (Single Loop)
ELECTRICAL RATINGS
The 8709 draws 1mA from the addressable device circuit.
