System Sensor D4120, D4P120, D4S User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

D4120 Duct Smoke Detector	3825 Ohio Avenue, St. Charles, Illinois 60174
D4S Sensor Component	1-800-SENSOR2, FAX: [phone]
D4P120 Power Board Component	www.systemsensor.com

NOTE: The D4120 duct detector consists of D4P120 Power Board component and the D4S Sensor component.

	SPECIFICATIONS
	Operating Temperature:				D4120 & D4S: –4° to 158° F (–20° to 70° C) D4P120: –40° to 158° F (–40° to 70° C)
	Storage Temperature:				D4120 & D4S: –22° to 158° F (–30° to 70° C) D4P120: –40° to 158° F (–40° 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.)
	D4120 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)
	D4S/D4P120 Footprint Dimensions:				7.75 in L x 5 in W x 2.5 in D (19.7cm L x 12.7cm W x 6.35cm D)
	D4120 Weight:				2.5 pounds; 1.14 kg
	Electrical
	Power supply voltage:				20-29 VDC				24 VAC 50-60-Hz				120 VAC 50-60 Hz
	Input capacitance:				270 µF max.				270 µF max.				N/A
	Reset Voltage:				3.0 VDC min.				2.0 VAC min.				10 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				20 mA RMS @ 120 VAC 60 Hz
	Max. alarm current				65 mA @ 24 VDC				135 mA RMS @ 24 VAC 60 Hz				35 mA RMS @ 120 VAC 60 Hz
	CONTACT RATINGS
												ACCESSORY CURRENT LOADS AT 24 VDC
	Alarm initiation contacts (SPST)		2.0A @ 30 VDC (resistive)									DEVICE	STANDBY		TROUBLE		ALARM
	Alarm auxiliary contatcs (DPDT)		10A @30 VDC (resistive)									APA151/APA451	12.5mA			n/a	30mA Max.
			10A @250 VAC (resistive)									MHR/MHW	0mA			n/a	29mA Max.
												RA400Z/RA100Z	0mA			n/a	12mA Max.
			1/2 HP @240 VAC
												RTS451/RTS151	0mA			n/a	12mA Max.
			1/4 HP @120 VAC
												RTS451KEY/RTS151KEY	12mA			n/a	12mA Max.
	NOTE: Alarm auxiliary contacts shall not be connected to initiating circuits of
												RTS2	3mA Max.		16mA Max.		30mA Max.
	control panels. Use the alarm initiation contact for this purpose.
												RTS2-AOS	3mA		16mA Max.		55mA Max.
	Supervisory Contacts (SPDT)		2.0A @ 30 VDC (resistive)
												NOTE: Any combination of accessories may be used such that the given
			2.0A @ 125 VAC (resistive)									accessory loads are: 110mA or less at the Aux output, and 50mA or less at the
	TABLE OF CONTENTS							PAGE				Alarm output.
	[1] Limitations of Duct Smoke Detectors.				. . . . . . . . . . . . .	. . . . .	. .	. .	. .	. 1		IMPORTANT: This detector must be tested and maintained regularly following
	[2] Exploded View of Duct Smoke Detector Components . .					. .	.	.	.	2		NFPA 72 requirements. The detector should be cleaned at least once a year.
	[3] General Description	. . . . . . . . . . . . . .					.	.	.	. 2
												[1] LIMITATIONS OF DUCT SMOKE DETECTORS
	[4] Contents of Duct Smoke Detector Kit									2
					. . . . . . . . . . . . . .	. . . .	. . .	.	. .
	[5] Detector Installation									2
		. . . . .	. . . .	. .	. . . . . . . . . . . . . .	. . . .	. . .	.	. .					WARNING
	[6] Sampling Tube Installation. .		. . . . . . . . . . . .				.	.	.	3
												The National Fire Protection Association has established that DUCT DETEC-
	[7] Measurement Tests									3
		. . . . .	. . . .	. .	. . . . . . . . . . . . . .	. . . .	. . .	.	. .			TORS MUST NOT BE USED AS A SUBSTITUTE FOR OPEN AREA DETECTOR
	[8] Field Wiring Installation Guidelines									4
				. .	. . . . . . . . . . . . . .	. . . .	. . .	.	. .			PROTECTION as a means of providing life safety. Nor are they a substitute for
	[9] Unit Configuration	. . . . . . . . . . . . . . .					.	.	.	5
												early warning in a building’s regular fire detection system.
	[10] Detector Status Indication									6
			. . . .	. .	. . . . . . . . . . . . . .	. . . .	. . .	.	. .			System Sensor supports this position and strongly recommends that the user
	[11] Interconnection (Multiple Fan Shut Down). . . . . . . . . .					. . . .	. . .	.	. .	. 6
	[12] Verification of Operation . . .		. . . .	. .	. . . . . . . . . . . . . .	. . . .	. . .	.	. .	. 6		read NFPA Standards 90A, 72, and 101. The D4120 Air Duct Smoke Detectors
	[13] Detector Cleaning Procedures. .			. . . . . . . . . .			. .		.	. 7		are listed per UL 268A.
	[14] Sensor replacement. .	. . . . .	. . . .	. .	. . . . . . . . . . . . . .	. . . . .	. .	.	. .	. 7		This device will not operate without electrical power. Fire situations may
	[15] Optional Accessories.	. . . . .	. . . .	. .	. . . . . . . . . . . . . .	. . . . .	. .	.	. .	. 7		cause an interruption of power. The system safeguards should be discussed
	Wiring Diagrams . . . . . . .	. . . . .	. . . .	. .	. . . . . . . . . . . . . .	. . . . .	. .	.	. .	5-7		with your local fire protection specialist.
	Warranty . . . . . . . . . . . . .	. . . . .	. . . .	. .	. . . . . . . . . . . . . .	. . . . .	. .	.	. .	8		This device will not sense smoke unless the ventilation system is operating
	BEFORE INSTALLING
												and the cover is installed.
	Read the System Sensor Guide for Proper Use of Smoke Detectors in Duct
												For this detector to function properly, it MUST be installed according to the in-
	Applications (A05-1004),	which	provides information on			detector		spacing,
												structions in this manual. Furthermore, the detector MUST be operated within
	placement, zoning, wiring, and special applications. This manual is available
												ALL electrical and environmental specifications listed in this manual. Failure
	online at www.systemsensor.com. NFPA Standards 72 and 90A should also be
												to comply with these requirements may prevent the detector from activating
	referenced for detailed information.
												when smoke is present in the air duct.
	NOTICE: This manual shall be left with the owner/user of this equipment.
	SS-300-000									1							I56-2967-006R

006R-2967-I56

[2] FIGURE 1. EXPLODED VIEW OF DUCT SMOKE DETECTOR COMPONENTS:

EXHAUST TUBE

4-WIRE

POWER BOARD

POWER BOARD MODULE COVER

SENSOR MODULE

COVER

METAL

SAMPLING TUBE (sold seperately)

SENSOR HEAD

MAGNET TEST LOCATION

H0549-09

[3] GENERAL DESCRIPTION

Smoke introduced into an air duct system will be distributed throughout the entire building. Smoke detectors designed for use in air duct systems are used to sense the presence of smoke in the duct.

Model D4120 and D4S Duct Smoke Detectors utilize 4-wire photoelectric technology for the detection of smoke. This detection method, when combined with an efficient housing, samples air passing through the duct allowing detection of a developing hazardous condition. When sufficient smoke is sensed, an alarm signal is initiated and appropriate action can be taken to shut off fans, blowers, change over air handling systems, etc. These actions can facilitate the management of toxic smoke and fire gases throughout the areas served by the duct system.

The D4120 and D4P120 detectors are designed to operate on 24 VDC/VAC or 120 VAC. Alarm and supervisory relay contacts are available for control panel interface (alarm initiation), HVAC control, and other auxiliary functions. Auxiliary relays are provided for fan shut down. Detector interconnection provides signaling of up to 50 other detectors in the loop for multiple fan shut down. These detectors are not designed for 2-wire applications.

[3.1] DETECTOR FEATURE SET

-Utilizes 2D51 plug-in head

-2 sensors to 1 power board capability -Cover missing signal

-Sampling tubes install from front or rear of detector -Compatible with existing accessories

[4] CONTENTS OF THE DUCT SMOKE DETECTOR KIT

1.Sensor/power board assembly and cover(s)

2.Three #10 sheet metal screws for mounting

3.Drilling template

4.One sampling tube end cap

5.One plastic exhaust tube

NOTE: A sampling tube must be ordered to complete the installation. It must be the correct length for the width of the duct where it will be installed. See Table 1 on page 3 to determine the inlet tube required for different duct widths.

[5] DETECTOR INSTALLATION

[5.1] VERIFY AIR FLOW DIRECTION AND VELOCITY

Model D4120 detectors are designed to be used in air handling systems with air velocities of 100 to 4000 feet per minute. Duct widths from 6 inches to 12 feet can be accommodated. Be sure to check engineering specifications to ensure that the air velocity in the duct falls within these parameters. If necessary, use a velocity meter (anemometer) to check the air velocity in the duct.

[5.2] DETERMINE MOUNTING LOCATION AND CONFIGURATION

On ducts wider than 18 inches it is recommended that the detector be mounted downstream of a bend, obstruction in the duct, or the supply or return air inlet.

Exception: Installation of duct detectors can be on or within a commercial packaged rooftop heating and air-conditioning system, fire/smoke dampers and economizers. They may be mounted in either the supply and/or return air section as determined by local code.

Once a suitable location is selected, determine if the detector is to be mounted in a side-by-side “rectangular” configuration or a top-over-bottom “square” configuration as shown in Figure 2. If mounting in the square configuration, remove the rear attachment screw, rotate the unit at the hinge, and replace the screw into the new attachment hole as shown in Figure 2. Do NOT remove the hinge screw during this process. Final installation approval shall be based upon passing section 7.2.2 and/or 8.2.4 tests.

FIGURE 2:
REMOVE SCREW AND PIVOT	REPLACE SCREW
DETECTOR AS SHOWN BELOW.	TO SECURE DETECTOR
	IN PLACE.

H0550-00

[5.3] DRILL THE MOUNTING HOLES

Remove the paper backing from the mounting template supplied. Affix the template to the duct at the desired mounting location. Make sure the template lies flat and smooth on the duct.

[5.3.1] FOR RECTANGULAR SIDE-BY-SIDE MOUNTING CONFIGURATION:

Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “B” for the rectangular configuration mounting tabs as shown on mounting template. Drill pilot holes at target “A” centers and cut two 1.375 inch diameter holes using a 13/8 inch hole saw or punch. Drill .156 inch diameter holes using a 5/32 inch drill at target “B” centers.

[5.3.2] FOR SQUARE TOP-OVER-BOTTOM MOUNTING CONFIGURATION OR D4S SENSOR COMPONENT MOUNTING:

Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “C” for the square configuration mounting tabs as shown on mounting template. Drill pilot holes at target “A” centers and cut two 1.375 inch diameter holes using a 13/8 inch hole saw or punch. Drill .156 inch diameter holes using a 5/32 inch drill at target “C” centers. If desired, drill an additional .156 inch hole at the location of one of the mounting tabs on the lower housing.

[5.4] SECURE THE DUCT DETECTOR TO THE DUCT

Use two (rectangular configuration) or three (square configuration) of the provided sheet metal screws to screw the duct detector to the duct.

CAUTION: Do not overtighten the screws.

SS-300-000

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I56-2967-006R

[6] SAMPLING TUBE INSTALLATION	ing out of the duct, select a shorter tube using Table 1. Otherwise, trim
[6.1] SAMPLING TUBE SELECTION	the tube to leave approximately 1 to 2 inches extending outside the duct.
The sampling tube must be purchased separately. Order the correct length,	Plug the end with the end cap and tape closed any holes in the protrud-
as specified in Table 1, for width of the duct where it will be installed. It is	ing section of tube. Be sure to seal the duct where the tube protrudes.

recommended that the sampling tube length extend at least 2/3 across the duct	FIGURE 4.
width for optimal performance.
TABLE 1. SAMPLING TUBES RECOMMENDED FOR DIFFERENT	12˝
DUCT WIDTHS:	1/4˝

Outside Duct Width

Sampling Tube Recommended*

Up to 1 ft.

DST1

2˝

1 to 2 ft.

DST1.5

2 to 4 ft.

DST3

3/4˝

DETECTOR

4 to 8 ft.

DST5

HOLE

8 to 12 ft.

DST10 (2-piece)

H0215-00

*Must extend a minimum of 2/3 the duct width. These sampling tubes can

NOTE: Air currents inside the duct may cause excessive vibration, especially

when the longer sampling tubes are used. In these cases, a 3 inch floor flange

only be used with new InnovairFlex duct smoke detectors.

(available at most plumbing supply stores) may be used to fasten the sam-

The sampling tube is always installed with the air inlet holes facing into the

pling tube to the other side of the duct. When using the flange/connector

air flow. To assist proper installation, the tube’s connector is marked with an

mounting technique, drill a 1 to 11/4 inch hole where the flange will be used.

arrow. Make sure the sampling tube is mounted so that the arrow points into

[6.3] MODIFICATIONS OF SAMPLING TUBES

the airflow as shown in Figure 3. Mounting the detector housing in a vertical

There may be applications where duct widths are not what is specified for the

orientation is acceptable provided that the air flows directly into the sampling

installation. In such cases, it is permissible to modify a sampling tube that is

tube holes as indicated in Figure 3. The sampling tube and exhaust tube

longer than necessary to span the duct width.

can be mounted in either housing connection as long as the exhaust tube is

Use a 0.193 inch diameter (#10) drill and add the appropriate number of holes

mounted downstream from the sampling tube.

FIGURE 3. AIR DUCT DETECTOR SAMPLING TUBE:

so that the total number of holes exposed to the air flow in the duct is 10 to 12.

Space the additional holes as evenly as possible over the length of the tube.

SAMPLING TUBE ENDCAP

NOTE: This procedure should only be used as a temporary fix and is not in-

tended as a substitute for ordering the correct length tubes.

[6.4] REMOTE SAMPLING TUBE INSTALLATION

The detector arrangement can also incorporate remote mounting of the sam-

pling tube and/or exhaust tube. In this case both the detector, sampling tube

and exhaust tube (if included) should be rigidly mounted to withstand the

ARROW MUST FACE

AIR FLOW

pressure and vibrations caused by the air velocity. The location of the detec-

tor’s sampling tube should be such that there is uniform airflow in the cross

INTO AIR FLOW

DIRECTION

section area.

H0551-00

The pressure differential across the sampling and exhaust ports in the detector

CAUTION: The sampling tube end cap, included with the detector, is criti-

housing shall be verified to be between 0.01 and 1.11 inches of water. Do so

cal to proper operation of the duct smoke detector. The end cap is needed to

by measuring the pressure difference between the inlet and outlet ports on the

create the proper air flow to the sensor of the duct smoke detector. Once any

detector housing using a manometer as described in Section 7.1.

sampling tube length adjustments are made, plug the end of the sampling tube

[7] MEASUREMENT TESTS

with the provided end cap.

[7.1] AIR FLOW

A plastic exhaust tube is included with the unit to be installed if needed. In-

The D4120 is designed to operate over an extended air speed range of 100 to

stall into the housing connection that is downstream from the sampling tube

4000 FPM. To verify sufficient sampling of ducted air, turn the air handler on

connection. The exhaust tube can be installed from the front or back of the

and use a manometer to measure the differential pressure between the two

detector. A longer 1 foot exhaust tube, model ETX, is available as an accessory

sampling tubes. The differential pressure should measure at least 0.01 inches

in cases where the molded exhaust tube does not extend at least 2 inches into

of water and no more than 1.11 inches of water. Because most commercially

the duct.

available manometers cannot accurately measure very low pressure differen-

[6.2] SAMPLING TUBE INSTALLATION

tials, applications with less than 500 FPM of air speed may require one of the

1. For tubes shorter than the width of the duct, slide the sampling tube,

following: 1) the use of a current-sourcing pressure transmitter (Dwyer Series

607) per Section 7.2, or 2) the use of aerosol smoke per section 12.5.3.

with installed end cap, into the housing connection that meets the air-

flow first. Position the tube so the arrow points into the airflow as shown

[7.2] LOW FLOW AIR FLOW TEST USING DWYER SERIES 607

in Figure 3. Per NFPA sampling tubes over 3 feet long should be sup-

DIFFERENTIAL PRESSURE TRANSMITTER

ported at the end opposite the duct detector. In ducts wider than 8 feet,

Verify the air speed of the duct using an anemometer. Air speed must be at

work must be performed inside the duct to couple the other section of

least 100 FPM. Wire the Dwyer transmitter as shown in Figure 5. Connect the

the sampling tube to the section already installed using the 1/2 inch con-

leads of the meter to either side of the 1000Ω resistor. Allow unit to warm up

duit fitting. Make sure that the holes on both sections of the air inlet

for 15 seconds. With both HIGH and LOW pressure ports open to ambient air,

sampling tube are lined up and facing into the airflow.

measure and record the voltage drop across the 1000Ω resistor (measurement

2. For tubes longer than the width of the duct, the tube should extend out

1), 4.00 volts is typical. Using flexible tubing and rubber stoppers, connect the

of the opposite side of the duct. Drill a 3/4 inch hole in the duct opposite

HIGH side of the transmitter to the sampling tube of the duct smoke detec-

the hole already cut for the sampling tube. Ensure that the sampling tube

tor housing, and the LOW side of the transmitter to the exhaust tube of the

is angled downward from the duct smoke detector to allow for moisture

duct smoke detector housing. Measure and record the voltage drop across the

drainage away from the detector.

The sampling tube should be angled

1000Ω resistor (measurement 2). Subtract the voltage recorded in measure-

at least 1/4” downward for every 12” of duct width per Figure 4. There

ment 1 from the voltage recorded in measurement 2. If the difference is greater

should be 10 to 12 holes spaced as evenly as possible across the width of

than 0.15 volts, there is enough air flow through the duct smoke detector for

the duct. If there are more than 2 holes in the section of the tube extend-

proper operation.

SS-300-000

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I56-2967-006R