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INSTALLATION INSTRUCTIONS
Models FS-250-ENCL/-R
Enclosures for FS-250
(For indoor use only in dry protected environments)
CAUTIONS
It is recommended that the printed circuit boards be
removed for any procedure that may cause dust,
metal shavings, grease or any such matter that may
affect the circuit boards and/or parts. There may be
several sources of power into the control unit. Each
source must be disconnected prior to installing or
removing modules, connecting or disconnecting
wiring, and programming jumpers.
CONTROL UNIT LOCATION
The control unit should be located near an exit at
ground level, where the normal ambient temperature
is maintained within the control unit specification. The
unit should be in an area that is free of dust, vibration, moisture and condensation. Any auxiliary
battery box or other accessory not connected
through a protective device or a circuit designed for
remote connection must be within the same room
and connected through electrical conduit.
INSTALLATION
The enclosures must be fastened securely to a
clean, dry, shock-free, and vibration-free surface.
Consider the following when mounting the box.
• Mounting height for visual and manual access to
the Display Board
• Weight and size of backbox
• Local mounting codes
When mounting the backbox, position the backbox
clear of obstructions so that the door can open freely and
so that indicators and controls are easily accessible.
The fire alarm control unit must be mounted in a
properly accessible location as required by applicable
codes. Any auxiliary battery box or other accessory
not connected through a protective device or a circuit
designed for remote connection must be within the
same room and connected through electrical conduit.
Installation is to be done only by qualified personnel
who have thoroughly read and understood these
instructions. The fire alarm control unit must be
mounted in a properly accessible location as required
by applicable codes.
Install the backbox:
1. Select a clean, dry, shock and vibration free
surface.
2. Position the backbox clear of obstructions so that
the front door opens freely and the controls and
indicators are easily accessible.
3. Mark the locations of the two upper mounting
bolts of the backbox on the wall.
Note: There are two key-shaped cutouts on the
top of the backbox. Make sure the end with the
two key-shaped cutouts is on top when installing
the backbox.
4. Drill the two holes located in the previous step
and screw in the top bolts, leaving a small gap
between the wall and each top bolt.
Note: The screw type and length must be able to
support the control unit, options and battery set.
You may need a different screw type, depending
on the wall material.
5. Place the backbox over the two top bolts and
allow it to slide down over the bolts.
6. Mark, drill, and install the two bottom bolts in the
backbox.
7. Tighten all four bolts securely against the back
wall of the backbox.
8. The PAD-3 Auxiliary Power Supply or battery
enclosure may be mounted immediately below
the main enclosure, close nipple, allowing a
minimum of 1 inch in between the enclosures for
clearance between the doors. Keeping the wire
run to the control unit short will keep the voltage
drop to a minimum.
9. If a semi-flush mount installation is desired, for the
FS-250 use the FS-SFT/-R Semi-flush Trim Kit.
The back-box can be mounted up to 3 1/2 inches
into the wall. Place the semi-flush trim around the
back-box and affix to the wall with four #10 x 3/4
inch wood screws (provided with trim).
Note: You may need a different screw type,
depending on the wall material.
Siemens Industry, Inc.
Building Technologies Division
Florham Park, NJ
P/N 315-648952-7 PAGE 1 OF 4
Page 2
Note: For semi-flush installations, if the PAD-3
Auxiliary Power Supply or a battery enclosure is
required, it may be mounted immediately above
or below the main enclosure, close nipple,
allowing a minimum of 3 inches in between the
enclosures for clearance between the semi-flush
trims. Keeping the wire run to the control unit
short will keep the voltage drop to a minimum.
Remove Knock-Outs
1. Prepare the enclosure for electrical wiring, break
out the appropriate conduit entry points.
Segregation is required between power limited and
non-power limited conductors. In order to maintain
the minimum separation, the following wire routing
is illustrated. Separation of at least a 1/4 inch is
required between the non-power limited and power
limited conductors. Power limited and non-power
limited wiring must be run in separate conduit.
2. Attach conduit (if required) and run wires as
required. Label each field cable for future
reference.
Basic system wiring and detector siting must be in
accordance with NFPA 72 or other instructions from
the appropriate local authority. Unit connections and
limitations are as indicated on the wiring diagrams
included in System Wiring part of this manual.
Wire reference data are included in Appendix A of the
FS-250 Owner’s Manual, P/N 315-048353.
Wiring Overview
In compliance with NEC Article 760 and UL 864, all
power limited fire protective signaling conductors
must be separated a minimum of 1/4 inch from all of
the following wiring located within a control panel:
• Electric light
• Power
• Class 1 or non-power limited fire protective
signaling conductors
If energy limited cable or equivalent is not used
within the FS-250 enclosure, then the following
guidelines do not apply. In that case, be sure to
follow standard wiring practices.
Wiring Entering Enclosure
Non-Power Limited Wiring
Wiring entering the enclosure from the bottom left
side of the backbox is considered non-power limited
wiring. Wiring must be in the shortest route and must
not overlap any other wiring.
Power Limited Wiring
Wiring entering the enclosure from the top and the
left side of the backbox is considered power limited.
Wiring must be in the shortest route and must not
overlap any other wiring.
Install Wiring
The primary mains input must have a separate or
dedicated circuit breaker. Wire in accordance with
local codes and NEC 760.
1. Remove the knockouts in the backbox for the
entry of field wiring. (Refer to Enclosure
Mounting Pictures on page 3 and Wiring
Separation Diagram on page 3 for the location of
knockouts.)
2. Pull all field wiring into the backbox. Do not
dress the wiring until the location of all the
equipment is known.
Install the wiring from the external power source to
the approximate location of the power supply.
Ground Wire Installation
FS-250
To meet these requirements, the following guidelines
must be observed when installing modules and
wiring to this control panel.
When installing power limited field wiring, the installer
must comply with NEC article 760, which states:
The fire alarm power-limited circuits are installed
using Types FPL, FPLR, FPLP or permitted
substitute cable, provided these power-limited
cable conductors extending beyond the jacket
are separated by a minimum of 0.25 in. (6.35
mm) or by a nonconductive sleeve or
nonconductive barrier from all other conductors.
P/N 315-648952-7 PAGE 2 OF 4
1. Attach one end of Ground Wire (P/N 600-149373) to inside
of outer door using provided #6 nut (P/N 950-220604).
2. Attach the other end of Ground Wire to top stud on inside
wall of backbox using provided #6 nut (P/N 950-220604).
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BOX 22”
J1
AC
N
GND
J1
B+B-
4+
4-
3+
3-
1-
2+
2-
1+
DOOR 22 9/32”
BOX 18”
DOOR 18 3/8”
M1
M3
M2
M4
PRE-
ALARM
ACPOWER
ALARM
ALARMSILENCED
SUPERVISORY
TROUBLE
ON
ACKNOWLEDGE
ALARMSILENCE
SYSTEMRESET
ABC
DEF
A
1
3
2
COM
PORT
JKL
GHI
MNO
5
6
4
B
PRS
TUV
WXY
8
7
9
C
MENU
D
0
#
*
DE-ENERGIZEUNITBEFORESERVICING
CAUTION:
11 9/64”
5 1/4”
2 5/8”
13 1/8”
4 7/8”
18”
15 3/8”
1 9/32”
25 1/8”
21 1/8”
M1M2M3
PRE-
ALARM
ALARM
ALARM
SILENCED
ACKNOWLEDGE
ALARMSILENCE
1
COM
PORT
GHI
4
PRS
7
*
DE-ENERGIZEUNITBEFORESERVICING
CAUTION:
3 1/2”
MAX
M4
ACPOWER
SUPERVISORY
TROUBLE
ON
SYSTEMRESET
ABC
DEF
A
3
2
JKL
MNO
5
6
B
TUV
WXY
8
9
C
MENU
D
0
#
11 9/64”
Mount Control Unit
of convenient height
for access to
display and controls
1”
16”
20 7/16”
9/16” TYP.
Mount Control Unit
of convenient height
for access to
display and controls
FS-250 BOX
FS-250 ENCLOSURE
KNOCK OUT LOCATIONS
TOP AND BOTTOM OF
ENCLOSURE
1/2 AND 3/4 COMBINATION
KNOCKOUTS - 8 TOTAL
(7/8 AND 1 1/8 DIA.)
FS-250 ENCLOSURE
FS-250 ENCLOSURE WITH SEMI-FLUSH TRIM
FS-250 Enclosure Mounting
Wiring Separation
All high voltage and non-power limited wiring must be kept separate from power limited wiring. A
separation of at least a 1/4 inch must be maintained, with high voltage and non-power limited wiring
running in separate conduit openings from power limited wiring.
KNOCKOUTS FOR FS-250
A. Non-power limited - High Voltage
(AC power) or B
B. Non-power limited - High Voltage
(AC power) or A
C. Power limited
D. Non-power limited
(Battery If external enclosure required)
E. Power limited (Non-power limited if
FS-REL is installed)
F Non-power limited if
Local Energy Box used
F. Power limited or G or H
G. Power limited or F or H
H. Power limited or F or G
SYSTEM MODULES FOR FS-250
1. Main Board
2. FS-NPE Transformer
3. FS-DACT DACT Board or FS-MT Municipal Tie
4. FS-DLC Loop Driver Board (requires Main Board)
5. FS-REL Module
10. Future Expansion – 485 Module
11. FS-NPE or FS-RPT if FS-REL is installed
AC EG
5
11
J1
OPTIONAL
TX-3
2
TO DISPLAY
BOARD
BRDG
TX-2
TX-1
2
AC
POWER
BD FH
1
AC
N
GND
B+B-
BAT.
FS-250
4
10
3
BATTERIES
1+
1-
2+
2-
3+
3-
4+
4-
P/N 315-648952-7 PAGE 3 OF 4
Page 4
Siemens Industry, Inc.
Building Technologies Division
Florham Park, NJ
P/N 315-648952-7 PAGE 4 OF 4
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