Siemens FDT421 User manual

A6V10323930_c_en_-- SIEMENS Industry, Inc.
2020-07-14 Smart Infrastructure
Installation Instructions
Model FDT421
Heat Detector
UL521 listed
Scan for electronic version
Figure 1
These instructions are written in accordance with the
installation guidelines of NFPA 72, National Fire Alarm
Code, and CAN/ULC-S524, The
Installation of Fire Alarm
Systems.
LED INDICATOR OPERATION
The Model FDT421 contains an LED indicator capable of
flashing either one of three distinct colors: green, yellow,
or red. The microprocessor-
based detector monitors the
following:
·Internal sensors and electronics
Based on the results of the monitoring, the LED indicator
flashes the following:
F l a sh
C o l o r
Cond iti on Flash I n t e r v a l
( S e conds )
Green *
Normal supervisory operation.
10
Yellow Detector is in trouble and
needs
replacemen t.
4
Red A larm 1
No
Flashes
Detector is not powered, or
replacement is needed .
–
* LED can be turned off. Please follow the corresponding
description o f the Panel used .
CAUTION
DO NOT install this detection device until all construction
is completed.
DO NOT store this detection device where it can be
contaminated by dirt, dust, or humidity.
DETECTOR PLACEMENT
Locate Model FDT421 on the ceiling, at least 4 inches
from the side walls. For an ideal, smooth ceiling
condition, place the detectors at a maximum center
spacing of 50 feet (2500 square feet).
Actual job conditions must determine detector spacing.
Consider environmental factors including ambient
temperature fluctuation, and the nature of the fire
hazard. Room or area configuration and ceiling type
(sloped or flat, smooth or beamed) also dictates
placement.
Drawings provided or approved by Siemens Industry,
Inc., or by its authorized distributors are extremely
important.The detector placements shown on these
drawings were chosen after a careful evaluation of the
area that is protected. Siemens Industry, Inc.’s
extensive experience in the design of the system
assures the best detector placement by following these
drawings. Sound engineering judgment by qualified
personnel must be followed.
TEMPERATURE – HUMIDITY – PRESSURE
The temperature range for the FDT421 detector is 32°F
(0°C) to 100°F (38°C). The thermal alarm temperature
depends on the parameter selected. Use the detector in
environments where the humidity does not exceed 95%
(non-
condensing). Normal changes of atmospheric
pressure do not affect detector sensitivity.

2 A6V10323930_c_en_--
DETECTOR PROGRAMMING
Each detector must be programmed to respond to a
n
address between 001 - 252.
To program the detector address, use the Model DPU
Device Programming Unit. Refer to the DPU Manual, P/N
315-033260.
Record the loop and device number (system
address) for
the detector on the detector label and on the base to
prevent installing the detector in the wrong base. The
optional DPU label printer can be used for this purpose.
Each detector provides pre-
programmed parameter sets
which can be selected by
the panel. Follow the
corresponding description of the panel used.
Fixed temperature 135 °F (57 °C)
Fixed temperature 145 °F (63 °C)
Fixed temperature 155 °F (68 °C)
Fixed temperature 165 °F (74 °C)
Fixed temperature 174 °F (79 °C)
Rate-of-rise detection:
·15 °F/min (8.3 °C) at fixed 135 °F (57 °C)
·15 °F/min (8.3 °C) at fixed 174 °F (79 °C)
Additionally, the detector can be configured by some
panels to have a low temperature warning at 40
°F
(4.4 °C).
WIRING
The FDT421
supports two operation modes: polarity
insensitive mode and isolator mode. The Detector can be
wired for either mode (refer to Figure 2 and 3). During
the isolator mode, the built-
in dual isolators will work at
both sides of the Detector to isolate the li
ne short in front
or behind the device.
When the FDT421
is wired in polarity insensitive mode,
Line -6 and -5 can be either line of the loop.
When the FDT421 is wired for I
solator mode, the positive
line needs to be connected to 1b and the negative line to
6. The next device needs to be connected to 1b and 5.
The Line Isolator is located between connector 6 and 5.
NOTICE
Ensure that the panel supports Isolator mode
for
the FDT421 product version 17.
Isolator mode must not be used with a FDT421
product version <17. You will find the product
version number on the detector label.
DETECTOR MOUNTING
To ensure proper installation of the detector head into the
base, be sure the wires are properly dressed at
installation:
·Position all wires flat against the base.
·Take up all slack in the outlet box
·Route wires away from connector terminals.
TO INSTALL DETECTOR HEAD
·
Rotate detector counterclockwise while gently
pressing on it until the detector seats fully into base.
·
Then rotate the detector clockwise until it stops and
locks in place. Insert optional locking screw (Order
Model LK-11).
TO REMOVE DETECTOR HEAD:
·
Loosen locking screw, if installed. Then rotate the
detector counterclockwise until stop is reached.
·Pull detector out of base.
DETECTOR TESTING
Only qualified service personnel should test. To assure
proper operation of the detector, the Functional Test
should be conducted. The minimum test schedule may
be found in the current edition of NFPA 72
for
installations in the U.S.
The detectors can be tested individually using the DPU.
Refer to the DPU Manual, P/N 315-033260
MAINTENANCE
No special maintenance procedures are required for the
FDT421.
The control unit automatically indicates the
trouble
message for any detector. The detector may
require replacement.
CAUTION
Under no circumstances is the detector head to be
disassembled.
No repairs should be attempted.
DO NOT PAINT
The detector is marked DO NOT PAINT. This is intended
to prohibit painting
during routine maintenance of the
occupancy which can affect proper operation of the
detector.
FDT421
S54320-F5-A1
17

A6V10323930_c_en_-- 3
Polarity insensitive wiring:
Figure 2
Isolator mode
w
iring:
Figure 3
Wire size: maximum 14 AWG, minimum 18 AWG (Wire larger than 14 AWG can damage the connector)
TO INITIATING CIRCUIT
OF SIEMENS COMPATIBLE
CONTROL UNIT
OPTIONAL
REMOTE
ALARM
INDICATOR
MODELS
8727W / 8727C /
RL-HW / RL-HC
TO NEXT BASE
TO NEXT BASE
DO NOT USE AN
END OF LINE DEVICE
DETECTOR BASE
MODEL DB-11/DB-11E
LINE 1 *
LINE 2 *
5
6
1a
TB1
TB3
TB2
1b
5
6
1a
1b
** The relay contacts are shown after System reset, which represents the non-alarm condition.
* FDT421 is a polarity insensitive detector. Line 1 and Line 2 can be either line of the loop.
5+
NO
C
NC
6-
RELAY CONTACTS **
3A, 120 VAC
3A, 30 VDC
DO NOT USE AN
END OF LINE DEVICE
OPTIONAL
REMOTE
ALARM
INDICATOR
MODELS
8727W / 8727C /
RL-HW / RL-HC
TO NEXT BASE
TO NEXT BASE
DO NOT USE AN
END OF LINE DEVICE
DETECTOR BASE
MODEL DB-11/DB-11E
LINE 1
LINE 2
5
6
1a
TB1
TB3
TB2
1b
5
6
1a
1b
*
The relay contacts are shown after System reset, which represents the non-alarm condition.
5+
NO
C
NC
6-
RELAY *
CONTACTS
3A, 120 VAC
3A, 30 VDC
DO NOT
USE AN
END OF LINE DEVICE
++
–
–
To initiating circuit of
SIEMENS compatible control unit

Siemens Industry, Inc.
Smart Infrastructure
8, Fernwood Road
Florham Park, New Jersey 07932
www.siemens.com/buildingtechnologies
Siemens Canada Limited
Smart Infrastructure
2 Kenview Boulevard
Brampton, Ontario L6T 5E4
Canada
© Siemens Industry, Inc.
Data and design subject to change without notice.
A6V10323930_c_en_-- P/N A5Q00041075
In the device line, up to 30 of any compatible devices in
polarity insensitive mode with 20 ohms max line
resistance can be isolated between two
modules in
isolator mode in a Class A Style 6 wiring.
In the device line, up to 30 of any compatible devices in
polarity insensitive mode with 20 ohms max line
resistance can be isolated behind one module in isolator
mode in a Class B Style 4 wiring.
HLIM isolator module and SBGA-
34 sounder base
cannot be used in the same loop with the modules in
isolator mode.
FCC Statement
WARNING!
Installation and usage of equipment not in accordance with instructions manual may
result in:
Radiation of radio frequency energy
Interference to radio communications
·Install and use equipment in accordance with installation instructions manual
·Read the following information
This equipment generates, uses, and can radiate radio frequency energy and if not installed and used in
accordance with the instructions manual, may cause interference to radio communications.
It has been tested and found to comply with the limits for a Class A computing device pursuant to Part 15 of FCC
Rules, which are designed to provide reasonable protection against such interference when operated in a
commercial environment.
Operation of this equipment in a residential area is likely to cause interference in which case the user at his own
expense will be required to take whatever measures may be required to correct the interference.