TYPICAL WIRING DIAGRAM
Figure 1
shows the typical wiring diagram of the 4-wire
multiple-station smoke 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
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 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 smoke 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 smoke 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.
Fig. 2 Mating detector head onto base
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.
ADJUSTING THE RELAY FOR NO/NC
The normal condition for the relay is
“
normally open
”
(NO).To remove top cover remove two screws on back of
NB-338 smoke detector as shown in Figure 3
1. To adjust the normal condition of the relay to
“
normally closed
”
(NC),
2. Refer to Figure 4. 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
one minute, check to see the indicator green LED
flashing once every 3~5 seconds. If green 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. Allow smoke from a cotton wick or a test smoke
aerosol to enter the detector-sensing chamber for at
least 10 seconds. When sufficient smoke has entered
the chamber, the detector will signal an alarm, this
being visible by a continuous illumination of the LED.
Reset each detector and/or control unit before
attempting to test any additional detectors in the same
zone. If the alarm fails in this step, it indicates a
defective unit, which requires service.
HEAT SENSOR TESTING
The detector to be tested should be subject to a flow of
warm air at a temperature of between 56
°
C and 80
°
C.
(The requirement can be met by some domestic hair
dryers).
Proceed as follows:
WIZMART
NB326-S and NB326-SH Detector
Installation Wiring Diagram
Fig. 4 Schematic of
detector Structure
When front cover is
open.
Fig. 3 Two screws on back
of NB-338 smoke detector
