Sentek HD 912 Quick start guide

SENSO
HD 912 Rate of Rise with Fixed Temperature Detector
Installation Wiring Diagram
Before Installing
The heat detector must be installed in compliance with
the control panel manual and meet the requirements of
the NFPA
TYPICAL WIRING DIAGRAM
Figure 1(a) shows the typical wiring diagram of the 2-wire
multiple-station heat detector system.
NOTE: IF REMOTE INDICATOR IS NOT USED, POLARITY TO DETECTOR MAY BE REVISED
Fig. 1.a. Installing the 2-wire heat detector base
DO NOT PLACE LINKS BETWEEN THE WIRING POSITIONS
OF TERMINALS 2 AND 5 TO PROVIDE POWER
SUPERVISION
Figure 1(b) shows the typical wiring diagram of the 4-wire
multiple-station heat detector system.
Fig. 1. b. Installing the 4-wire heat detector base
DO NOT PLACE LINKS BETWEEN THE WIRING POSITIONS
OF TERMINALS 2 AND 5 TO PROVIDE POWER
SUPERVISION
WARNING
TO PREVENT DETECTOR CONTAMINATION AND
SUBSEQUENT WARRANTY CANCELLATION, THE
SMOKE DETECTOR MUST REMAIN COVERED UNTIL
THE AREA IS CLEAN AND DUST FREE.
INSTALLING THE BASE
1. To insure proper installation of the detector head to the
base, all the wires should be properly addressed at
installation:
(A) Position all the wires flat against terminals.
(B) Fasten the wires away from connector terminals.
2. If you use a jumper wire to connect the poles of
terminal 2 and 5 when testing the detector loop
continuity, be sure to remove the jumper wire prior to
the installation of the detector head.
3. The end-of-line device shown in fig. 1(a) and 1(b)
should be compatible with the control unit. The
end-of-line supervisory relay used should be rated for
the DC power voltage used.
4.Open area heat detectors are intended for mounting on
a ceiling or a wall in accordance with the fire standard
in your country.
5. The base of the heat detector can be mounted directly
onto an electrical junction box such as an octagonal
(75mm, 90mm or 100mm), a round (75mm), or a
square (100mm) box without using any type of
mechanical adapter.
INSTALLING THE HEAD
1. Align the components as shown in Figure 2.
2. Mate the detector head onto the base and twist
clockwise to secure it.
3. Do not install the detector head until the area is
thoroughly cleaned of construction debris, dusts, etc.
The maximum number of smoke detector installed in
the same loop is 30 units.
ADJUSTMENT THE RELAY POSITION
ADJUSTING THE RELAY FOR NO/NC
The normal condition for the relay is “normally open”
(NO).
1. To adjust the normal condition of the relay to “normally
closed”(NC), insert a screwdriver into the rectangular
hole located on the side between the front cover and base
and rotate to remove the front cover.
2. Refer to figure 3. There is a jumper head next to the
relay on the PCB. Remove the jumper head and reinsert it
in the NC position.
3. Carefully replace the front cover.
Relay contact rating:
1A@30VDC,
0.5A@125VAC.
TESTING
1.All the alarm signal services, releasing device and
extinguisher system should be disengaged during the
test period and must be re-engaged immediately at the
conclusion of testing.
2. After energizing the detector head for approximately 30
seconds, check to see the indicator red LED flashing
once every 1-3 seconds. If red LED fails to flash, it
indicates the non-functioning of the detector or faulty
wiring. Re-check the wiring or replace the detector if
necessary.
Fig. 3 Schematic of detector structure When
front cover is open.
Fig. 2 Mating detector head onto base

3. The detector to be tested should be subject to a flow of
warm air at a temperature of between 56°C and 80°C.
(This requirement can be met by some domestic hair
dryers).
Proceed as follows:
(1). Switch on the warm airflow and check that
temperature is correct and stable.
(2). From a distance of several inches, direct the
airflow at the guard protecting the thermistor. The
detector should alarm within 30 seconds.
(3). Upon alarm immediately remove the heat source
and check that the red LED of the detector is
illuminated. Reset the detector from the control
panel.
(4). If detector fails to go into alarm mode within 30
seconds it is too insensitive and needs to be
returned to the distributor for servicing.
(5). After testing, check that the system is set for
normal operation and notify the appropriate
authorities that the testing operation is complete
and the system is active again.
CAUTIONS
This heat detector is particularly designed to initiate and
activate emergency action, but will do so only when it is used
in conjunction with an authorized fire alarm system. This
detector must be installed in accordance with NFPA Standard
72.
The purpose of design of heat detectors is meant to
protect property, not life. The heat detectors do not provide
early warning of fire and cannot detect smoke, gas,
combustion particles, or flame. They will alarm when
temperature at the heat detector reach 57oC (135oF) or
above. Given the rapid growth of certain types of fires, heat
detectors cannot be expected to provide adequate warning of
fires resulting from smoking in bed, inadequate fire protection
practices, violent explosions, escaping gas, and improper
storage of flammable liquids like cleaning solvents, other
safety hazards, or arson.
Heat detectors do not always detect all fires because the
fire may be a slow-smoldering, low-heat type (producing
smoke), or because they may not be mean where the fire
occurs, or because the heat of the fire may bypass them.
Heat detectors will not detect smoke, gas, flames, or
combustion particles.
Heat detectors are components in professionally installed fire
alarm systems. They will not function if they have been
improperly wired into the fire alarm system or if power to
them is disconnected for any reason.
Heat detectors cannon last forever. They should be tested
and maintained following the instructions in this manual. To
be safe, they should be replaced after they have been
installed for ten years.
Refer to NFPA 72 for application.
CAUTION: DO NOT ATTEMPT TO DISASSEMBLY OF THE
FACTORY SEALED HEAT DETECTOR. THIS ASSEMBLY
IS SEALED FOR YOUR PROTECTION AND IS NOT
INTENDED TO BE OPENED FOR SERVICING BY USERS.
TO OPEN THE DETECTOR HEAD WILL VOID THE
WARRANTY.
REFER TO THE TECHNICAL BULTTIN ISSUE NO. STHD20080508S1,
REV.E, May 08, 2008.
SPECIFICATION
Model
2/4
wire
Voltage
DC
(Min./Max)
Standby
Current
(Max.)
Alarm
Current
(12 /24V)
Surge
Current
(Max.)
Temperature
Rating
Permissible
Current
(Max.)
Frequency
Alarm
contact
Base model
Safety
HD912-2
2
10.8~33V
40μA
20/50mA
100μA
135℉/57℃
80mA
1-3 Seconds
—
P/N852001
UL/CUL/CE
HD912-2L
2
10.8~33V
40μA
20/50mA
100μA
135℉/57℃
80mA
1-3 Seconds
—
P/N854001
UL/CUL/CE
HD912-4(12V)
4
12V
40μA
33mmA
100μA
135℉/57℃
80mA
1-3 Seconds
Form A
P/N854001
UL/CUL/CE
HD912-4(24v)
4
24V
40μA
46mA
100μA
135℉/57℃
80mA
1-3 Seconds
Form A
P/N854001
UL/CUL/CE
HD912-4B
4
12/24V
40μA
33mA/46mA
100μA
135℉/57℃
80mA
1-3 Seconds
Form A
P/N854001
—
HD912-4AR
4
12/24V
40μA
33mA/46mA
100μA
135℉/57℃
80mA
1-3 Seconds
Form A
P/N854001
—
HD912-4ARB
4
12/24V
40μA
33mA/46mA
100μA
135℉/57℃
80mA
1-3 Seconds
Form A
P/N854001
—
Remarks: AR-auto reset function/ L-remote LED indicator output/ B-Buzzer
HDMI912080528, REV H,05.28.2008.
Manufacturer:
Sentek Electronics Co., Ltd.
448 Yingchun Road, Wangchun Industrial Zone, Ningbo City 315175,
Zhejiang, China
Tel: [phone] Fax: [phone]
email: [e-mail] Web: www.sentek.cc
LIMITED WARRANTY STATEMENT
SENTEK ELECTRONICS INC. declares that this product is free from defects in material and workmanship. And it will repair or replace any
product or part thereof which proves to be defective in workmanship or material for a period of twelve (12) months from the date of purchase
but not to exceed eighteen (18) months after shipment by the manufacturer. For a full description of SENTEK’S LIMITED WARRANTY, which,
among other things, limits the duration of warranties of merchantability and fitness for a particular purpose and excludes liability for
consequential damages. Please read the entire LIMITED WARRANTY on the SENTEK quotation. Acceptance of order and/or original invoice
which will become part of your sales agreement. Please contact SENTEK directly for a return merchandise authorization (RMA) number before
returning goods to the factory . Shipment must be prepaid and SENTEK will repair or replace your returned detector.