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
NFPA.
TYPICAL WIRING DIAGRAM
Figure 1(a)
shows the typical wiring diagram of the
2-wire heat detector system.
INITIATING
LOOP
EN54 LISTED
COMPATIBLE
CONTROL
PANEL
+
-
FIRST DETECTOR BASE
LAST DETECTOR BASE
EOL
RESISTOR
5
2
5
2
6
1
3
4
6
1
3
4
+
-
+
REMOTE
INDICATOR
CLASS A OPTIONAL WIRING
NOTE: IF REMOTE INDICATOR IS NOT USED. POLARITY TO DETECTOR MAY BE REVERSED.
-
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 heat detector system.
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 HEAT
DETECTOR MUST REMAIN COVERED UNTIL THE AREA
IS CLEAN AND DUST FREE.
INSTALLING THE BASE
1. The detector must be installed in compliance with the
control panel manual and meet the requirements of
NFPA 72.
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.
The maximum numbers of heat detector allowed to
connected to each initiating device circuit of the control
unit are 30 units.
Fig. 2 mating detector head onto base
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.
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.
Fig.1.b. Installing the 4-wire heat detector base
Fig.1.a. Installing the 2-wire heat detector base
