MGC SD-4WT Installation Wiring Diagram

TYPICAL WIRING DIAGRAM
Figure 1.a shows the typical wiring diagram of 2-wire
multiple-station smoke detector system.
DO NOT USE LOOPED WIRE UNDER
TERMINALS 2 AND 5 BREAK WIRE RUN TO
PROVIDE SUPERVISION OF CONNECTIONS
Figure 1.b shows the typical wiring diagram of 4-wire
multiple-station smoke detector system.
DO NOT USE LOOPED WIRE UNDER
TERMINALS 2 AND 5 BREAK WIRE RUN TO
PROVIDE SUPERVISION OF CONNECTIONS
WARNING
TO PREVENT DETECTOR CONTAMINATION AND
SUBSEQUENT WARRANTY CANCELATION,
SMOKE DETECTOR MUST REMAIN COVERED
UNTIL 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 the 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 figure 1.A & 1.B
should be compatible with the control unit. The
end-of-line supervisory relay used should list the rated
DC power voltage used.
4. Per UL listing, open area smoke detectors are
intended for mounting on a ceiling no less than 6
inches from a wall or mounting on a wall than no less
than 4 inches and no more than 12 inches from a
ceiling.
Photoelectric Smoke Detector
Installation Wiring Diagram
5. The base of smoke detector can be mounted directly
onto electrical junction box such as octagonal (3",
3.5" or 4"), round (3"), and square (4" length) 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.
Fig. 2 Mating detector head onto base
ADJUSTMENT THE RELAY POSITION
4-wire type: Adjust the relay set-position for wiring unit to
the security monitoring system by the following steps:.
1. The reset position for the relays is at "normal open"
(NO) position, when energizing all the relays.
2.
If one needs to adjust the relay set point, use a
screwdriver to push up the rectangular hole located on
the side between the front cover and base to remove
the front cover. See figure 3. There is a jump head
next to the relay on the PCB, adjust it to select set
point either "normal close" (NC) or "normal open"
(NO) position.
3. Relay contact rating:
1A@30VDC,
0.5A@125VAC.
Operating voltage:
Max.: 26VDC
Min.: 8.4VDC
CHAMBER
Fig. 3 Schematic of detector structure
TESTING
1.
All the alarm signal services, releasing device and
extinguisher system should be disengaged during the
test period and must be reengaged immediately at the
conclusion of testing.
2.
For 2-wire/4-wire type: turn power on and energize the
detector head for at least 1 minute before proceeding
the following testing procedures.
After energizing the detector head for approximately
one minute, check to see the indicator LED flashing. If
LED fails to flash, the detector is not functioning or the
wiring is faulty. Recheck the wiring or replace the
detector if necessary.
3. Allow smoke from a cotton wick or a punk to enter the
detector's sensing chamber for at least 10 seconds.
RELAY JUMPER
SETTING
LED
when front cover is open.