Instruction 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.
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