Figure 3
HLIM Wiring Diagram - Class B Installation
The HLIM may be used in two circuit configurations as follows:
Class B (See Figure 3) In Class B wiring each HLIM isolates a branch on the circuit. Note that
a short on the main branch causes the entire loop to fail.To prevent this, mount the
HLIMs at the enclosure and run each branch independently.
Figure 4
HLIM Wiring Diagram - Class A Installation (Single Loop)
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 HLIM.
3. 18 AWG minimum, 14 AWG
maximum.
4. The total wire resistance
(both wires) between HLIMs
cannot exceed 20 ohms.
5. Do not install more than 15
HLIMs per DLC/FS-DLC
loop.
6. All circuits are supervised.
7. Refer to DLC Installation
Instructions, P/N 315-033090
or the FS-250 Manual, P/N
315-049353 for the list of
compatible devices, as
applicable.
8. All terminals are power
limited.
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 HLIM.
3. 18 AWG minimum, 14 AWG
maximum.
4. The total wire resistance
(both wires) between HLIMs
cannot exceed 20 ohms.
5. Do not install more than 15
HLIMs per DLC/FS-DLC
loop.
6. All circuits are supervised.
7. Refer to DLC Installation
Instructions, P/N 315-033090
or the FS-250 Manual, P/N
315-049353 for the list of
compatible devices, as
applicable.
8. All terminals are power
limited.
ANALOG LOOP
LINE 1
LINE 2
IN IN OUT OUTIN IN OUT OUTIN IN OUT OUT EARTH EARTH EARTH
TO ANALOG
LOOP RETURN
INSIDE ENCLOSURE
TO ANALOG
LOOP FEED
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
Class A Single Loop (See Figure 4) In Class A wiring the HLIMs are wired in series with the loop 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.
• The FireFinder-XLS displays communication errors for the devices and a
Class A failure for the loop itself.
• The FS-250 displays the message “DLC Open” and “no response” for
devices in the groups on the loop that follow the short.
Siemens Industry, Inc.
Building Technologies Division
Florham Park, NJ
Siemens Building Technologies, Ltd.
Fire Safety & Security Products
2 Kenview Boulevard
Brampton, Ontario
L6T 5E4 Canada
P/N 315-034904-4
