z
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 57
o
C (135
o
F) 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.
Maintenance
At least once every 12 months remove the detector for close
inspection and, if found to be necessary cleaning, clean the
detector more frequently if environment contains appreciable
sources dirt or corrosive agents.
IMPORTANT
:
Before removing a detector for maintenance,
notify the appropriate authorities that fire alarm system or a
specific zone of the system will be temporarily out of service.
Disable the zone or system undergoing maintenance to prevent
unwanted alarms.
To maintain a heat detector the following steps can be
applied:
1. Remove the detector head from its base.
2. Do not damage the heat sensor for the heat detector
models.
3. Check that thermistor bead is free from dirt or dust, if
necessary; gently wipe it with a clean tissue paper.
4. After cleaning the detector, be sure not to tangle the
leads of thermistor.
5. Check thermistor head in standing upright in the
center of its plastic protective guard.
6. Install the detector into its base again.
7. Test the operation of the heat detector.
8. Enable the zone or system again and notify the
appropriate authorities that the maintenance
operation is complete and the system is active again.
9. Enable the zone or system again and notify the
appropriate authorities that the maintenance
operation is complete and the system is active again.
Heat detectors are designed to be as maintenance-free as
possible. However, dirt or corrosive agents can accumulate
inside a detector’s sensing head and influence its sensitivity.
They could reduce the amount of warning time given in case
of a fire. Therefore, detectors should be tested periodically
and maintained at regular intervals. Follow closely the
manufacturer’s recommended procedures for maintenance
and testing and refer to the NFPA 72.
REFER TO THE TECHNICAL BULTTIN ISSUE NO. STHD20080508S1,
REV.E, May 08, 2008.
SPECIFICATION
Model
2/4
wire
Voltage
DC
Standby
Current
(Max)
Alarm
Current
(Min /Max)
Surge
Current
(Max)
Frequency
Temperature
Rating
Rate of Rise of
Temperature
(Max)
UL Maximum
Spacing
(10-foot ceiling)
Alarm
Impedance
(Min/Max)
Alarm
Contact
Base
Model
HD 912-2
2
10.8~33V 180
μ
A
18/80mA 180
μ
A 1-3
Seconds
13
5 ℉/57 ℃
1
5 ℉/8.3 ℃
40-feet x40-feet
411
Ω
/594
Ω
-
P/N852001
HD 912-2L
2
10.8~33V 180
μ
A
18/80mA 180
μ
A 1-3
Seconds 13
5 ℉/57 ℃
1
5 ℉/8.3 ℃
40-feet x40-feet
411
Ω
/594
Ω
-
P/N854001
HD 912-4(12V)
4
12V
180
μ
A
23/33mA 180
μ
A 1-3
Seconds
13
5 ℉/57 ℃
1
5 ℉/8.3 ℃
40-feet x40-feet
-
Form A
P/N854001
HD 912-4(24V)
4
24V
180
μ
A
34/46mA 180
μ
A 1-3
Seconds
13
5 ℉/57 ℃
1
5 ℉/8.3 ℃
40-feet x40-feet
-
Form A
P/N854001
Remarks:
L
-remote LED indicator output
HDMI912080528, REV H, 05.28.2008.
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
