SS-300-022
1 I56-3936-002R
d4240 duct Smoke detector
inSTaLLaTion and mainTenance inSTrucTionS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
TabLe of conTenTS
Page
[1] Limitations of Duct Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . 1
[2] Exploded View of Duct Smoke Detector Components . . . . . . . . . . . . . 2
[3] General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
[4] Contents of Duct Smoke Detector Kit. . . . . . . . . . . . . . . . . . . . . . . . . . 2
[5] Detector Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
[6] Sampling Tube Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
[7] Measurement Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
[8] Field Wiring Installation Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . 4
[9] Unit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
[10] Detector Status Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
[11] Interconnection (Multiple Fan Shut Down). . . . . . . . . . . . . . . . . . . . . 6
[12] Verification of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
[13] Detector Cleaning Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
[14] Sensor replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
[15] Optional Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
before inSTaLLing
Read the System Sensor
Guide for Proper Use of Smoke Detectors in Duct
Applications
(A05-1004), which provides information on detector spacing,
placement, zoning, wiring, and special applications. This manual is available
online at www.systemsensor.com. NFPA Standards 72 and 90A should also be
referenced for detailed information.
NOTICE:
This manual shall be left with the owner/user of this equipment.
I56-3936-00
2R
SPecificaTionS
Operating Temperature:
D4240: –4° to 158° F (–20° to 70° C)
Storage Temperature:
D4240: –22° to 158° F (–30° to 70° C)
Humidity:
0% to 95% Relative Humidity Non-condensing
Air Velocity:
100 to 4000 ft./min. (0.5 to 20.3 m/sec.)
D4240 Footprint Dimensions:
Rectangular - 14.38 in L x 5 in W x 2.5 in D (37cm L x 12.7cm W x 6.36cm D)
Square - 7.75 in L x 9 in W x 2.5 in D (19.7cm L x 22.9cm W x 6.35cm D)
D4240 Weight:
2.5 pounds; 1.14 kg
Electrical
Power supply voltage:
20-29 VDC
24 VAC 50-60-Hz
240 VAC 50-60 Hz
Input capacitance:
270 µF max.
270 µF max.
N/A
Reset Voltage:
3.0 VDC min.
2.0 VAC min.
20 VAC min.
Reset Time (with RTS451/RTS151): .03 to 0.3 sec.
.03 to 0.3 sec.
.03 to 0.3 sec.
Reset Time (by power down):
0.6 sec. max.
0.6 sec. max.
0.6 sec. max.
Power Up Time:
35 sec. max.
35 sec. max.
35 sec. max.
Alarm response time:
15 sec.
15 sec.
15 sec.
Sensitivity Test:
See detector label
See detector label
See detector label
Current Requirements (Using No Accessories)
Max. standby current
21 mA @ 24 VDC
65 mA RMS @ 24VAC 60Hz
10 mA RMS @ 240 VAC 60 Hz
Max. alarm current
65 mA @ 24 VDC
135 mA RMS @ 24 VAC 60 Hz
18 mA RMS @ 240 VAC 60 Hz
CONTACT RATINGS
Alarm initiation contacts (SPST) 2.0A @ 30 VDC (resistive)
Alarm auxiliary contatcs (DPDT) 10A @30 VDC (resistive)
10A @250 VAC (resistive)
1
/
2
HP @240 VAC
1
/
4
HP @120 VAC
NOTE: Alarm auxiliary contacts shall not be connected to initiating circuits of
control panels. Use the alarm initiation contact for this purpose.
Supervisory Contacts (SPDT)
2.0A @ 30 VDC (resistive)
2.0A @ 125 VAC (resistive)
ACCESSORY CURRENT LOADS AT 24 VDC
DEVICE
STANDBY
TROUBLE
ALARM
APA151/APA451
12.5mA
n/a
30mA Max.
MHR/MHW
0mA
n/a
29mA Max.
RA400Z/RA100Z
0mA
n/a
12mA Max.
RTS451/RTS151
0mA
n/a
12mA Max.
RTS451KEY/RTS151KEY
12mA
n/a
12mA Max.
SSK451/RTS2-AOS
8mA Max.
16mA Max.
40mA Max.
NOTE: Any combination of accessories may be used such that the given
accessory loads are: 110mA or less at the Aux output, and 50mA or less
at the Alarm output.
IMPORTANT:
This detector must be tested and maintained regularly following
NFPA 72 requirements. The detector should be cleaned at least once a year.
[1] LimiTaTionS of ducT Smoke deTecTorS
WARNING
The National Fire Protection Association has established that DUCT DETEC-
TORS MUST NOT BE USED AS A SUBSTITUTE FOR OPEN AREA DETECTOR
PROTECTION as a means of providing life safety. Nor are they a substitute for
early warning in a building’s regular fire detection system.
System Sensor supports this position and strongly recommends that the user
read NFPA Standards 90A, 72, and 101. The D4240 Air Duct Smoke Detectors
are listed per UL 268A.
This device will not operate without electrical power. Fire situations may
cause an interruption of power. The system safeguards should be discussed
with your local fire protection specialist.
This device will not sense smoke unless the ventilation system is operating
and the cover is installed.
For this detector to function properly, it MUST be installed according to the in-
structions in this manual. Furthermore, the detector MUST be operated within
ALL electrical and environmental specifications listed in this manual. Failure
to comply with these requirements may prevent the detector from activating
when smoke is present in the air duct.
