Installation Instructions
Model HLIM
Loop Isolator Module
OPERATION The SIEMENS Model HLIM Loop Isolator Module isolates short circuits on FireFinder-
XLS analog loops. By placing devices between HLIMs during installation, a short in
the wiring within that group is disconnected from the rest of the loop. The remainder
of the devices continue
to operate. The HLIM
FRONT BACK
operates in both Class A
and Class B circuits.
A yellow LED flashes IN - LINE 1
IN - LINE 2
when a device detects a FAULT
OUT - LINE 1
short circuit. The HLIM OUT - LINE 2
then isolates that part of
the loop. When the short
is removed, the HLIM
automatically restores Figure 1
the loop to normal The HLIM-1 Loop Isolator Module
operation. The HLIM
does not have a loop address and therefore does not require address programming
nor does it reduce the loop capacity below 252 devices.
Remove all system power before installation, first the battery and then the AC.
INSTALLATION The HLIM 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 HLIM may be used in two circuit configurations as follows:
Class B (See Figure 2) 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 FireFinder-XLS enclosure and run each branch independently.
Siemens Building Technologies
P/N 315-033170-2 Fire Safety
1. All wiring must comply with
national and local codes.
2. In order to provide adequate LINE 1
protection, it is recom- ANALOG LOOP
mended that you do not
LINE 2
install more than 20 devices
on a single HLIM.
3. Minimum wire gauge is
18 AWG.
4. The total wire resistance
(both wires) between HLIMs
cannot exceed 20 ohms.
5. Do not install more than 15
HLIMs per DLC loop.
6. All circuits are supervised.
7. Refer to DLC Installation IN IN OUT OUT IN IN OUT OUT IN IN OUT OUT
Instructions, P/N 315-033090
for the list of compatible
devices.
8. All terminals are power Figure 2
limited. HLIM Wiring Diagram - Class B Installation
Class A Single Loop (See Figure 3) 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 commu-
nication errors for the devices and a Class A failure for the loop itself.
1. All wiring must comply with
national and local codes. INSIDE ENCLOSURE
2. In order to provide adequate
protection, it is recom-
OUT OUT IN IN OUT OUT IN IN OUT OUT IN IN
mended that you do not
TO ANALOG
install more than 20 devices LOOP RETURN
on a single HLIM. LINE 2
3. Minimum wire gauge is LINE 1
18 AWG.
4. The total wire resistance
(both wires) between HLIMs LINE 1
cannot exceed 20 ohms. LINE 2
5. Do not install more than 15
HLIMs per DLC loop. TO ANALOG
LOOP FEED
6. All circuits are supervised.
IN IN OUT OUT IN IN OUT OUT IN IN OUT OUT
7. Refer to DLC Installation
Instructions, P/N 315-033090
for the list of compatible
devices.
8. All terminals are power Figure 3
limited. HLIM Wiring Diagram - Class A Installation (Single Loop)
Siemens Building Technologies 2 P/N 315-033170-2
Fire Safety
Mechanical Installation (See Figure 4)
Use a standard 3 1/2-inch deep, double gang electrical switchbox or a 4-inch
square electrical box that is 2 1/8 inches deep.
Connect the field wiring. Press the HLIM into the box and fasten the
module plate to the box.
Cover the module front plate with the plate supplied and fasten with screws
supplied.
ELECTRICAL RATINGS Input power: 24 VDC, 1mA max
DOUBLE GANG BOX
3 1/2-INCHES DEEP
4-INCH SQUARE BOX
2 1/8-INCHES DEEP
SWITCHPLATE
4-INCHES SQUARE
(SUPPLIED)
SWITCHPLATE
4-INCHES SQUARE
(SUPPLIED)
Figure 4
Mounting
Siemens Building Technologies 3 P/N 315-033170-2
Fire Safety
Siemens Building Technologies, Inc. Siemens Building Technologies, Ltd.
8 Fernwood Road 2 Kenview Boulevard
Florham Park, New Jersey 07932 Brampton, Ontario L6T 5E4 P/N 315-033170-2
