10
9
19
20
1
12
15
3
2
1
DUCTSD240
APA151
(GREEN LED) POWER
FIELD
INSTALLED
JUMPER
11
2
+
–
AUX OUT +
AUX OUT –
ALARM
R TEST
ACC +
ACC –
R RESET
7
18
8
17
6
16
14
3
13
5
4
SUP, NO
SUP, C
NOTE:
WIRING DIAGRAM SHOWN IS FOR DUCTSD 4-WIRE DUCT
SMOKE DETECTOR SYSTEM EQUIPPED WITHOUT A CONTROL PANEL.
NOTE:
A TROUBLE CONDITION IS INDICATED
BY LOSS OF GREEN LED
COMMON
(RED LED) ALARM
FIGURE 9. DETECTOR SENSOR EXPLODED VIEW:
SENSOR
COVER
SENSING
CHAMBER
COVER AND
SCREEN
SENSOR
CHAMBER
COVER
REMOVAL
TABS
H0642-01
C1009-00
10
9
19
20
1
12
15
2
6
1
5
4
3
DUCTSD240
RTS151/RTS151KEY
(GREEN LED)
POWER
(RED LED)
ALARM
FIELD
INSTALLED
JUMPER
11
2
+
–
AUX OUT +
AUX OUT –
ALARM
R TEST
ACC +
ACC –
R RESET
7
18
8
17
6
16
14
3
13
5
4
SUP, NO
SUP, C
FOR RTS151KEY ONLY WITHOUT A CONTROL PANEL
FIELD
INSTALLED
JUMPERS
4. Notify the proper authorities testing has been completed and the smoke
detector system is back in operation.
NOTICE: If any unitary packaged air conditioning units are run during the
drywall installation phase of any building under construction to accelerate
the drying of joint compound, the subsequent sanding of those drywall joints
and resulting dust may compromise the sensor heads in duct smoke detectors.
To avoid this condition it is recommended that the sensor heads be removed
during the construction phase.
For additional information visit www.systemsensor.com for a detailed techni-
cal bulletin.
[13] SENSOR REPLACEMENT (PART NO. 2D51)
1. Remove the sensor head by rotating counterclockwise.
2. Pull gently to remove it.
3. To replace the sensor head, align the mounting features and rotate clock-
wise into place.
H0643-01
FIGURE 10. WIRING DIAGRAMS FOR OPTIONAL ACCESSORIES:
[11.6] DUCT CLEARING
After an ALARM event occurs, the unit may be reset by pressing the RESET
pushbutton. If the duct is not clear of smoke, the AUX relay will open for 20
seconds, to allow the fans to run and clear the duct of smoke. If the smoke
has cleared the unit will go into STANDBY, otherwise the unit will remain in
ALARM.
[12] DETECTOR CLEANING PROCEDURES
Notify the proper authorities that the smoke detector system is undergoing
maintenance, and that the system will temporarily be out of service. Disable
the zone or system undergoing maintenance to prevent unwanted alarms and
possible dispatch of the fire department.
[12.1] DETECTOR SENSOR
1. Remove the sensor to be cleaned from the system.
2. Remove the sensor cover by pulling outward on each of the four removal
tabs that hold the cover in place. See
Figure 9
.
3. Vacuum the screen carefully without removing it. If further cleaning is
required continue with Step 4, otherwise skip to Step 7.
4. Remove the chamber cover/screen assembly by pulling it straight out.
5. Use a vacuum cleaner or compressed air to remove dust and debris from
the sensing chamber.
6. Reinstall the chamber cover/screen assembly by sliding the edge over the
sensing chamber. Turn until it is firmly in place.
7. Replace the cover using the holes for the LEDs for alignment and then
gently pushing it until it locks into place.
8. Reinstall the detector.
[12.2] REINSTALLATION
1. Reinstall the detector in its housing.
2. Restore system power.
3. Perform Detector Check, Section 11.2.
ALARM
AUX OUT –
15
20
(+)
(–)
ALARM
AUX OUT –
15
20
(+)
(–)
RED
MHR/MHW
(OPTIONAL) AUDIO
ALERT
DUCTSD240
DUCT DETECTOR
DUCTSD240
DUCT DETECTOR
RA100Z(OPTION-
AL)REMOTE (LED)
ANNUNCIATOR
H0641-01
FIGURE 11. WIRING DIAGRAM FOR DUCTSD240 TO APA151:
FIGURE 12. WIRING DIAGRAM FOR DUCTSD240 TO RTS151/RTS151KEY:
[14] OPTIONAL ACCESSORIES
[14.1] RTS151/RTS151KEY REMOTE TEST STATION
The RTS151/RTS151KEY Remote Test Station facilitates test of the alarm ca-
pability of the duct smoke detector as indicated in the RTS151/RTS151KEY
manual. The DUCTSD240 duct smoke detector can be reset by the RTS151/
RTS151KEY. To install the RTS151/RTS151KEY, connect the device as shown in
Figure 12
; wire runs must be limited to 25 ohms or less per interconnecting
wire. If a system control panel is used, the panel itself may require testing.
6
I56-4260-002R
06-10
