Faraday 8709 User manual

P/N 315-034904FA-3 PAGE 1 OF 2
OPERATION
The 8709 Isolator module isolates short circuits on an Addressable Device Circuit
of a fire alarm control unit. The 8709 operates in both Style 4 (Class B) and Style 6
(Class A) circuits.
When used in a Style 4 circuit, placing devices in several branches after 8709
modules, a short in the wiring within that branch is disconnected from the rest of
the loop. The devices in the separate branches will continue to operate.
When used in a Style 6 circuit, placing devices between 8709 modules, a short in
the wiring within that group is disconnected from the rest of the loop. The remain-
der of the devices will continue to operate.
Refer to Figure 1 for the location of the two input terminals, two output terminals
and earth ground.
A yellow LED flashes when a device detects a short circuit. The 8709 then isolates
that part of the circuit. When the short is removed, the 8709 automatically restores
the circuit to normal operation. The 8709 does not have an address and therefore
does not require address programming nor does it reduce the capacity of the
Addressable Device Circuit.
Figure 1
The 8709 Isolator Module
Remove all system power before installation, first the battery and then the AC.
MOUNTING
(See Figure 2) The 8709 must be installed in a UL Listed electrical box.
1. Use a standard 31/2-inch deep, double gang electrical switchbox or a 4-inch square electrical box that
is 21/8inches deep.
2. Connect the field wiring. Press the 8709 into the box and fasten the module plate to the box.
3. Fasten the cover plate to the module, making sure the LED is aligned with the hole in the cover plate.
INSTALLATION INSTRUCTIONS AND WIRING FOR
ISOLATOR MODULE
P/N 8709
Siemens Industry, Inc.
Building Technologies Division • Florham Park, NJ
Tel: [phone] • Fax: [phone]
Web: www.faradayfirealarms.com
SWITCHPLATE
5-INCHES SQUARE
(SUPPLIED)
SWITCHPLATE
5-INCHES SQUARE
(SUPPLIED)
4-INCH SQUARE BOX
2 1/8-INCHES DEEP
DOUBLE GANG BOX
3 1/2-INCHES DEEP
Figure 2
8709 Mounting
Terminal
Number Description
1 IN — Line 1
2 IN — Line 2
3 OUT — Line 1
4 OUT — Line 2
5 Earth Ground

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
ININ
OUTOUT
EARTH
EARTH
ININ
OUTOUT
EARTH ININ
OUTOUT
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.