Page 1
Installation Instructions
Model HI921
Heat Detector
Figure 1
HI921
These instructions are written in accordance with the installation
guidelines of NFPA 72, National Fire Alarm Code, The Installation
of Fire Alarm Systems.
CAUTION
Detection Device Storage
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 HI921 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.
Should questions arise regarding detector placement, follow the
drawings provided and/or approved by Siemens Industry, Inc.,
or by its authorized distributors. This is extremely important! The
detector placements shown on these drawings were chosen after
a careful evaluation of the area being protected. Siemens
Industry, Inc.’s extensive experience in design of the system
assures the best detector placement by following these drawings.
TEMPERA TURE – HUMIDITY – PRESSURE
The operating temperature range for the HI921 detectors is 32°F
(0°C) to 100°F (38°C). The thermal alarm temperature depends
on the parameter selected. Use these detectors in environments
where the humidity does not exceed 95% (non-condensing).
Normal changes of atmospheric pressure do not affect detector
sensitivity.
LED INDICATOR OPERATION
The Model HI921 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:
hsalF
roloCnoitidnoC
*neerG.noitarepoyrosivrepuslamroN01
wolleY
deRmralA1
oN
sehsalF
ceteD
.tnemecalper
.desulenaPeht
sdeendnaelbuortnisirot
ro,derewoptonsirotceteD
.dedeensitnemecalper
rocehtwollofesaelP.ffodenrutebnacDEL*
lavretnIhsalF
)sdnoceS(
4
fonoitpircsedgnidnopser
DETECTOR PROGRAMMING
Each detector must be programmed to respond to a unique
system 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, or the 8720 Programming Unit, refer to the
8720 Manual, P/N 315-033260FA.
• 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 or 8720 label printer can be used for this
purpose.
Each detector provides pre-programmed parameter sets which
can be selected by the panel. Please follow the corresponding
descriptions of the panel used.
• Fixed 135°F (57°C)
• Fixed 145°F (63°C)
• Fixed 155°F (68°C)
• Fixed 165°F (74°C)
• Fixed 174°F (79°C)
• Rate-of-rise detection: 15°F/min (8.3°C) at fixed 135°F (57°C)
• Rate-of-rise detection: 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).
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Page 2
WIRING
T
T
Detector bases for Model HI921 should be connected as shown
in Figure 2.
DETECTOR MOUNTING
T o ensure proper inst allation 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
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 rot ate the detector
counterclockwise until stop is reached.
• Pull detector out of base.
counterclockwise while gently pressing on
DETECTOR TESTING
Only qualified service personnel should test. To assure proper
operation of the detector and control panel, 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) or with the Model 8720
Programming Unit (refer to the 8720 Manual, P/N 315-033260FA).
MAINTENANCE
No special maintenance procedures are required for the HI921.
The control unit automatically indicates the trouble message for
any detector. This detector may need replacement.
CAUTION: UNDER NO CIRCUMSTANCES IS THE
DETECTOR HEAD TO BE DISASSEMBLED. NO REPAIRS
SHOULD BE ATTEMPTED.
DO NOT PAINT
The detector/base plastic 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.
LINE 1**
DETECTOR BASE
MODEL DB-11/DB-11E
FROM ADDRESSABLE
DEVICE CIRCUIT OF A
COMPATIBLE CONTROL
UNIT OR PREVIOUS
ADDRESSABLE DEVICE
LINE 2**
561a
1b
*The relay contacts are shown after System reset, which represents the non-alarm condition.
**HI921 is a polarity insensitive detector. Line 1 and Line 2 can be either line of the loop.
Figure 2
Installation and Wiring Diagram
OPTIONAL
REMOTE
ALARM
INDICATOR
MODELS
RL-HW / RL-HC
TB2
TB1
TB3
REMOTE RELAY
BASE MODEL DB2-HR
5+
NO
C
6–
NC
RELAY*
CONTACTS
3A, 120 VAC
3A, 30 VDC
561a
TO NEXT BASE
5+
NO
1b
C
6–
NC
TO NEXT BASE
DO NO
USE AN
END OF
LINE
DEVICE
DO NO
USE AN
END OF
LINE
DEVICE
Building Technologies Division
Florham Park, NJ
Building Technologies Division
2 Kenview Boulevard
Brampton, Ontario L6T 5E4 Canada
Siemens Canada Limited
A6V10323932_a_en_--Siemens Industry, Inc.
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