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
