System Sensor Smoke Alarm DH500ACDC User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

DH500ACDC Intelligent Air Duct

Smoke Detector Housing

Specifications

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495

www.systemsensor.com

Length:

Width:

Depth:

Weight:

14.5 inches

5 inches

4 inches

4 lbs.

(36.7 cm.)

(12.7 cm.)

(10.2 cm.)

(1.8 kg.)

Operating Temperature Range:

Operating Humidity Range:

Duct Air Velocity:

32° to 120°F (0° to 49°C)

10% to 93% Relative Humidity

500 – 4000 ft./min. (91.4 – 1219.2 m/min.

Power Supply Electrical Ratings For DH500ACDC

24 VDC (20 - 30)

mA DC MAX.

Power

Requirements

120 VAC (102 - 132)

mA rms MAX.

240 VAC (204 - 264)

mA rms MAX.

24 VAC (20.6 - 26.4)

mA rms MAX.

Device

Alarm

Standby

Alarm

Standby

Alarm

Standby

Alarm

Standby

DH500ACDC

1.5

182

PA400*

RA400ZA*

17.3

157

1.5

RTS451/RTS451KEY*

RTS451**/RTS451KEY

6.5

140

103

11.5

5.5

The currents shown for the DH500ACDC are maximum values with no accessories.

* All accessory currents are additional to DH500ACDC. There are no additional currents for accessories in standby.

** RTS451/RTS451KEY when the magnet is held in place to initiate an alarm.

24V output maximum load is 80 mA; auxiliary alarm output maximum load is 20 mA.

Auxiliary Relay Contacts

Minimum contact current must be greater than 500 mA at 24 VDC

10 amps maximum at 30 VDC

10 amps maximum at 250 VAC

Before Installing

General Description

Please thoroughly read the System Sensor Manual I56-

473-XX, Guide for Proper Use of Smoke Detectors in Duct

Applications, which provides detailed information on

detector spacing, placement, zoning, wiring, and special

applications. Copies of this manual are available at no

charge from System Sensor. NFPA Standards 72 and 90A

should also be referenced for detailed information.

An HVAC system supplies conditioned air to virtually every

area of a building. Smoke introduced into this air duct sys-

tem will be distributed to the entire building. Smoke detec-

tors designed for use in air duct systems are used to sense

the presence of smoke in the duct.

The DH500ACDC Air Duct Detector Housings are used with

System Sensor’s Model 1551 ionization detector heads and

Model 2551 photoelectronic detector heads (purchased sep-

arately). These two smoke detection methods are combined

with an efficient housing design that samples air passing

through a duct and allows detection of a developing hazard-

ous condition. When sufficient smoke is sensed, an alarm

signal is initiated at the fire control panel monitoring the

detector, and appropriate action can be taken to shut off

fans and blowers, change over air handling systems, etc.

This can prevent the distribution of toxic smoke and fire

gases throughout the areas served by the duct system.

NOTICE: This manual should be left with the owner/user

of this equipment.

IMPORTANT: This detector must be tested and maintained

regularly following NFPA 72 requirements. The detector

should be cleaned at least once a year.

D500-07-00

I56-432-11R

Figure 2. Speed nut mounting location:

Figure 2A. Installation of foam gaskets over sam-

pling tube bushings:

HOLE B

SAMPLING

TUBE BUSHING

DUCT DETECTOR

HOUSING

MOUNTING

SCREWS

HOLE A

DUCT

WALL

O-RINGS

EXHAUST TUBE

(EXTENSION BUSHING)

FOAM

GASKETS

SPEED

NUT

SCREW HOLES FOR ATTACHING

DETECTOR HOUSING TO DUCT

H0117-00

H0116-00

CAUTION: Do not overtighten the screws.

Exception: Where it is physically impossible to locate the Step 4. Install The Inlet Tube

detector accordingly, the detector can be positioned closer The inlet tube (shown in Figure 3) is identified by a series

than six duct widths, but as far as possible from the open- of air inlet holes on the tube. This tube must be purchased

ing, bend, or deflection plates.

separately. Order the correct length, as specified in Table

1, for the width of the duct where it will be installed. The

exhaust tube is molded into the base of the duct housing.

Step 3. Mount Duct Housing

Remove the duct housing cover. Slide the foam gaskets over

the tube bushings as shown in Figure 2A. Make sure the The inlet tube should be installed in the inlet sampling

two small holes in the gaskets line up with the two duct tube bushing located in the center of the duct detector

housing mounting holes. Put one 5/16-inch O-ring over housing. (See Figure 2A.) The air inlet holes must face into

each of the two #10 sheet metal screws. Use the two sheet the air flow. To assure proper installation, the tube mount-

metal screws to secure the duct housing to the duct.

ing flange is marked with arrows. Mount the inlet tube so

that the arrows point into the air flow. Figure 4 shows the

various combinations of duct detector and tube mounting

configurations with respect to air flow.

Table 1. Sampling (Inlet) Tubes

TUBE

ST-1.5

ST-3

ST-5

ST-10

OUTSIDE DUCT WIDTH

1 to 2 ft.

2 to 4 ft.

4 to 8 ft.

8 to 12 ft.

(0.3 to 0.6 m)

(0.6 to 1.2 m)

(1.2 to 2.4 m)

(2.4 to 3.7 m)

Figure 3. Air duct detector inlet sampling tube:

AIR HOLES

FLANGE

INLET

TUBE

END

PLUG

ARROWS

MUST FACE

INTO AIR FLOW

H0108-00

AIR FLOW DIRECTION

D500-07-00

I56-432-11R

Figure 4. Tube mounting configurations with varying air flow direction and orientation of detector housing.

Vertical as well as horizontal mounting is acceptable.

DOTS INDICATE POSITION OF

SAMPLING TUBE HOLES

AIR FLOW

DIRECTION

DETECTOR

HOUSING

DETECTOR

HOUSING

INLET

TUBE

EXHAUST

TUBE

EXHAUST

TUBE

INLET

TUBE

HORIZONTAL MOUNTING OF HOUSING

EXHAUST

TUBE

DETECTOR

HOUSING

EXHAUST

TUBE

AIR FLOW

DIRECTION

AIR FLOW

DIRECTION

INLET

TUBE

DETECTOR

HOUSING

H0109-00

VERTICAL MOUNTING OF HOUSING

A. Installation for Ducts Less Than 8 Feet Wide

1. If the inlet tube is longer than the width of the air duct, Install the inlet tube as follows:

drill a 3/4-inch hole in the duct directly opposite the

hole already cut for the inlet tube.

If the inlet tube is shorter than the width of the air duct,

1. Drill a 3/4-inch hole in the duct directly opposite the

hole already drilled for the inlet tube.

install the end cap into the inlet tube as shown in Figure 2. Slide the inlet tube into the bushing located in the center

of the duct housing. Position the tube so that the arrows

point into the air flow. Secure the tube flange to the

housing bushing with the two #6 self-tapping screws.

3. From inside the duct, couple the other section of the

inlet tube to the section already installed using the 1/2-

inch conduit fitting supplied. Make sure that the holes

on both of the air inlet tubes are lined up facing the

direction of air flow.

2. Slide the inlet tube into the bushing located in the center

of the duct housing. Position the tube so that the arrows

point into the air flow.

3. Secure the tube flange to the housing bushing with the

two #6 self-tapping screws.

4. For tubes longer than the width of the air duct, the tube

should extend through the opposite side of the duct. If

there are more than 2 holes in the section of the tube 4. Trim the end of the tube protruding through the duct so

extending from the duct, select a different tube length

using Table 1. Otherwise, trim the end of the tube pro-

truding through the duct so that 1 to 2 inches of the tube

extends outside the duct. Plug this end with the tube

end plug and tape closed any holes in the protruding

section of the tube. Be sure to seal the duct when the

tube protrudes.

that 1 to 2 inches of the tube extends outside the duct.

Plug this end with the tube end plug and tape closed any

holes in the protruding section of the tube. Be sure to

seal the duct when the tube protrudes.

5. Any tube (over 3 feet long) that doesn’t protrude through

the duct (on the side opposite the housing) must be sup-

ported by other means.

5. Any inlet tube over 3 feet long must be supported on the

opposite side of the duct detector housing.

NOTE: An alternate method to using the ST-10 is to use

two ST-5 inlet tubes. Remove the flange from one

of the tubes and install as described above. After

the installation, use electrician’s tape to close off

some of the sampling holes so that there are a total

of 12 holes spaced as evenly as possible across the

width of the duct.

WARNING

In no case should more than 2 air inlet holes be cut off the

tube. There must be a minimum of 10 holes in the tube

exposed to the air stream.

B. Installation for Ducts More Than 8 Feet Wide

NOTE: To install inlet tubes in ducts more than 8 feet

wide, work must be performed inside the air duct.

Sampling of air in ducts wider than 8 feet is accom-

plished by using the ST-10 inlet sampling tube.

NOTE: Air currents inside the duct may cause excessive

vibration. This vibration can slowly open the

seal around the tube and permit air to escape. To

prevent this from occurring, a 3-inch floor flange,

D500-07-00

I56-432-11R

available at most plumbing supply houses, may be Notes on Jumper Wire J5 (See Figure 5A):

used. This flange/connector mounting technique 1. When the detector is used in a 4-wire application (relay

makes the initial installation easier because a 1-

inch to 1-1/4-inch hole may be drilled where the

flange/connector will be used. It is easier to push

the inlet tube through the larger hole.

circuit is being used to control fans, dampers, etc.),

jumper wire J5, located between the two terminal strips

on the printed circuit board, must be cut to insure power

supply supervision.

Modification Of Inlet Sampling Tubes

2. When the detector is used in a 2-wire application (relay

control is not being used for any control of fans, damp-

ers, etc.), jumper wire J5 must be left in place.

There may be situations where duct widths are not as

specified for the installation. In such cases, it is permissible

to modify an inlet sampling tube that is longer than neces-

sary to span the duct width.

120/240 VAC Operation

To complete the wiring for 110/120 VAC operation, connect

Use a 0.193-inch diameter (#11) drill and add the appro- the power supply wires to terminals 15 and 16 (see Figure

priate number of holes so that the total number of holes 5A). If 220/240 VAC operation is preferred, connect the

exposed to the air flow in the duct is 10 to 12. Space the power supply wires to terminals 16 and 17.

additional holes as evenly as possible over the length of

the tube.

24 VAC/DC Operation

To complete the wiring for 24 VAC or DC, connect the

power supply wires to terminals 7 and 8. Polarity is not

important.

Step 5. Field Wiring

Wiring Installation Guidelines

All wiring must be installed in compliance with the

National Electrical Code and the local codes having juris- Step 6. Install the Filters

diction, using the proper wire size(s). The conductors used Most duct installations are subject to dust accumulation.

to connect smoke detectors to control panels and accessory System filters remove a large percentage of this contami-

devices should be color-coded to reduce the likelihood of nation, but cannot remove all of it. Dust inside the duct

wiring errors. Improper connections can prevent a system detector causes problems. First, very fine particles of dust

from responding properly in the event of a fire.

can enter the detector sensing chamber and cause the unit

to alarm. Second, the accumulation of dust and dirt neces-

For signal wiring, (the wiring between interconnected sitates a more frequent periodic cleaning schedule, which

detectors or from detectors to auxiliary devices), it is rec- can result in substantial cost and/or down time.

ommended that single-conductor wire be no smaller than Disposable sampling tube filters can greatly reduce the

18 gauge. The duct detector terminals accommodate wire nuisance alarms caused by dust, and can also significantly

sizes up to 14 gauge. The last foot or so of conduit should extend the maintenance interval. To install the sampling

be flexible steel conduit (available in electrical supply tube filters, insert the filter adapter into the exhaust tube

houses) which facilitates installation and puts less strain and push the filter onto the adapter tube on the left, as

on the conduit holes in the housing. Solid conduit connec- shown in Figure 6. Then, install the other filter over the

tions may be used, if desired.

end of the inlet sampling tube.

CAUTION

Smoke detectors and alarm system control panels have

specifications for allowable loop resistance. Consult the Filters require periodic cleaning or replacement, depend-

control panel manufacturer’s specifications for the total ing on the amount of dust and dirt accumulated. Inspect

loop resistance allowed for the control panel being used the filters at least quarterly – more often if dust accumula-

before wiring the detector loop.

tion warrants it. Replacement filters can be ordered from

Notifier. (Exhaust tube/intake tube filter P/N F36-05-00.)

Wiring Instructions

The DH500ACDC is designed for easy wiring. The housing Filters rarely have a significant effect on the behavior of

provides a terminal strip with clamping plates. Wiring con- smoke. As a result, even a filter that is as much as 90%

nections are made by stripping approximately 3/8-inch of clogged does not significantly affect the entry of smoke

insulation from the end of the wire, sliding this bare end into the duct detector housing. Therefore, visual inspection

under the plate, and tightening the clamping plate screw.

is usually all that is necessary to determine if filters need

replacement.

The DH500ACDC is built for 120/240 VAC or 24 VAC/DC

to operate auxiliary functions. See Figure 5A for operating

and wiring details.

D500-07-00

I56-432-11R

Figure 5. Wiring diagram:

D500-07-00

I56-432-11R

Step 7. Perform Detector Check

7.1 Air Flow

B. RTS451/RTS451KEY Remote Test Station

The RTS451/RTS451KEY Remote Test Station facili-

tates testing of the duct detector alarm capability.

The DH500ACDC duct detector cannot be reset by the

RTS451/RTS451KEY. It must be reset at the system con-

trol panel.

1. To verify sufficient sampling of ducted air, use a manom-

eter to measure the differential pressure created from

air flow across the sampling tubes. The pressure should

measure no less than 0.01 inches of water and no greater

than 1.20 inches of water.

2. To determine that smoke is capable of entering the sens- To install the RTS451/RTS451KEY test coil, connect the

ing chamber, conduct a visual examination to note any device as shown in Figure 9. Place the coil in the detector

obscurations around the sensing chamber. If a smoke housing with the arrow facing up and pointing toward the

test is required, blow smoke from a cigarette, cotton detector as in Figure 9. Attach the coil leads to the housing

wick, or punk directly at the smoke detector head. It is terminals as shown; polarity is not important. Firmly screw

important to plug the exhaust and sampling tube hole the test coil mounting bracket in place over the test coil.

to prevent ducted air from blowing smoke away from The resistance of the wire connecting the remote test sta-

the smoke detector head. Record all test records in the tion to the duct detector must be less than 25 ohms.

Detector Test Log at the end of this manual.

7.3 MOD400R Sensitivity Test

After verification of alarm capability, use a MOD400R test

CAUTION

Remove the plugs after testing or the detector will not module with a voltmeter to check detector sensitivity as

sense smoke in the air duct.

described in the MOD400R installation manual. The hous-

ing cover must be removed to perform this test.

7.2 Alarm Tests

Before replacing the duct housing cover, check the detector If the MOD400R readings indicate that the sensor head is

interconnections. Check the DH500ACDC as follows:

outside of the acceptable range, the sensor heads require

cleaning (refer to Periodic Maintenance Requirements).

A. M02-04-00 Magnet Test

1. Make sure power is applied to the detector.

7.4 Trouble Test

2. Position the painted surface of the test magnet against The capability of trouble detection is tested by removing

the housing next to the rib molded onto the outside of the detector head from the duct housing. The detector

the housing (see Figure 7).

head is removed by rotating it counterclockwise about

3. The LEDs on the detector should latch on as should 10 degrees (Figure 8). The system control panel should

any accessories (PA400, RA400ZA, RTS451) and the indicate a trouble condition. Reinstalling the detector head

alarm condition verified at the control panel. The should clear the trouble condition.

control panel must be active to initiate an alarm.

Figure 6. Sampling tube filter installation:

INLET SAMPLING TUBE

FOAM GASKET

SAMPLING TUBE

MOUNTING

SCREWS

DETECTOR BASE

EXHAUST

FILTER ADAPTER

DETECTOR HEAD

H0239-00

SAMPLING TUBE

FILTERS

D500-07-00

I56-432-11R

Figure 7. Testing detector alarm:

Figure 8. Detector head removal:

DETECTOR

HEAD

DETECTOR

HEAD

TWIST

COUNTERCLOCKWISE

TO REMOVE

DUCT

HOUSING

TEST

RESET

LOCATOR

TEST

LOCATOR

MAGNET

PAINTED SIDE

TOWARD HOUSING

DUCT

HOUSING

TWIST

CLOCKWISE

TO INSTALL

H0243-00

H0244-00

Step 8. Install the Cover

It is recommended that a permanent Detector Test Log be

Install the cover using the four screws. Be certain filters are set up and maintained, with a record for each individual

installed as specified in Step 6. Make sure that the cover fits smoke detector in each building. Each detector should be

into the base groove and that all gaskets are in their proper clearly described, with information on the type of detector,

positions. Tighten the four cover screws to 10 in-lbs.

the model number, the serial number (if any), the location,

and the type of environment. Data entries should include

test dates, type of test mode, test results, maintenance, and

Step 9. Perform the Final System Check

Position the test magnet as shown in Figure 7. The LEDs comments. A Detector Test Log is included at the end of

on the detector should light. Any accessory LED(s) should this manual.

also light and the system control panel should indicate an

alarm condition.

Recommended Detector Maintenance Procedure

NOTE: Notify the proper authorities that the smoke detec-

tor system is undergoing maintenance and will be

temporarily out of service. Disable the zone or sys-

tem undergoing maintenance to prevent unwanted

alarms and possible dispatch of the fire depart-

ment.

Periodic Maintenance Requirements

Air duct smoke detectors should be maintained at least

once a year – more often if the detector heads become

obviously dirty. The detectors must also be cleaned imme-

diately after a fire. Failure to properly maintain air duct

smoke detectors may cause unnecessary false alarms.

Figure 9. RTS451/RTS451KEY Test Coil Installation:

TEST COIL

DETECTOR

HEAD

H0245-0

D500-07-00

I56-432-11R

1. Turn off power to the system.

2. Remove and inspect sampling tube filters.

12. Brush or vacuum the inside of the cover. The cover

may then be blown out using clean compressed air.

3. If filters are heavily coated with dirt, replace them with 13. Vacuum the sensing chamber before using clean,

new filters. If they are not heavily coated, use a vacuum

cleaner or compressed air nozzle to remove dust, then

install the filters.

compressed air to loosen and blow out any remaining

debris.

14. Press the screen back into the cover.

15. Replace the detector cover on the sensing chamber.

Rotate it clockwise to lock it in place.

Both Types Of Units

4. Remove the detector from the housing. (See Figure 8.)

Photo Units

5. Remove the detector cover by inserting a small-bladed 16. Reinstall the detector in its housing.

screwdriver into the slot located approximately 90 17. Restore system power.

degrees from the MOD400 test jack. Rotate the cover 18. Put detector into alarm using appropriate method

counterclockwise to remove it. See Figure 10.

described in STEP 7.

6. Lift the screen from the photo chamber. Vacuum the Perform Detector Check

screen and cover before using clean, compressed air to 19. Notify the proper authorities that testing has been

loosen and blow out any remaining debris (replacement completed and the smoke detector system is back in oper-

screens are available, part no. RS24).

ation.

7. Vacuum the photo chamber. Then, use clean compressed 20. Other checks that should be made during maintenance

air to blow it clean.

procedures:

8. Replace the screen by aligning the arrow on top with the

test slot in the base of the detector. Press the screen into

place. It should fit tightly in the chamber.

Ion Units

— Holes or cracks in duct work near vicinity of detec-

tor.

— Air leaks where detector housing or sampling tubes

are attached to duct.

9. See Figure 11. Remove the cover and screen assembly

by depressing the three lock prongs on the top of the

cover and rotating the cover counterclockwise. The

CRT400 Cover Removal Tool makes cover removal

easier.

— Dust accumulations in or on sampling tubes.

— Wiring terminal screw tightness.

10. Carefully pull the screen out of the cover.

11. Clean the screen thoroughly with a soft brush or vacu-

um cleaner (replacement screens, part no. RS14).

Figure 10. Photo head exploded view:

Figure 11. Ion head, exploded view:

REMOVABLE HEAD COVER

REMOVABLE

COVER

FOR

CLEANING

TEST SLOT

REMOVABLE SCREEN

(P/N RS14)

CLEANABLE SCREEN

LOCK PRONG

P/N RS24 (W/O THERMAL)

SENSING CHAMBER

HEAD COVER

REMOVAL SLOT

VANED CHAMBER

H0246-00

H0261-00

D500-07-00

I56-432-11R

2. The duct control circuitry (auxiliary relay contacts and

auxiliary alarm output) may change states if the sensor

is tested and the LED is turned on for more than 4 sec-

onds. If the LED is latched on for less than 4 seconds,

the control circuitry of the DH500ACDC will NOT oper-

ate.

3. The panel must not poll the same unit for more than

4 seconds continuously or the auxiliary relay and aux-

iliary alarm output may switch states. After 4 seconds

of continual polling of a device, the panel must wait a

minimum of 100ms before polling or communicating to

that same device.

Accessories

Remote LED

Part No.

RA400ZA

PA400

F36-05-00

M02-04-00

P48-21-00

A2650-01

RS14

Piezo Alert Sounder

Replacement Filters

Magnet

End Plug For Sampling Tube

Installation Kit (Parts bag)

Ionization Replacement Screen

Sensitivity Test Kit

MOD400R

CRT400

RTS451/RTS451KEY

Ionization Cover Removal Tool

Remote Test Station

4. Communications must not cease for more than 3 sec-

onds without an additional clock pulse (after Pulse

Width 5) to turn off the LED on the sensor.

Programming Specifications/Requirements For

Intelligent System Control Panels

5. To allow the auxiliary relay and auxiliary alarm output

to return to a standby condition, (after being in alarm)

the panel must wait a minimum of 100ms after turning

off the sensor LED before communicating to that device

again.

CAUTION

Models 1551 and 2551 can be used with the DH500ACDC if

the following constraints are observed.

1. There may be a limit to the number of devices per zone

that can have their LEDs latched on. The number of

devices is determined by the control panel and its abil-

ity to supply LED current. If more than the maximum

number of devices is on the same loop, do NOT use

the DH500ACDC for control purposes. Control for duct

applications would need to come directly from the con-

trol panel or by using control modules.

D500-07-00

I56-432-11R

Please refer to insert for the Limitations of Fire Alarm Systems

Three-Year Limited Warranty

System Sensor warrants its enclosed air duct smoke detector to be free

Avenue, St. Charles, IL 60174. Please include a note describing the mal-

function and suspected cause of failure. The Company shall not be obli-

gated to repair or replace units which are found to be defective because

of damage, unreasonable use, modifications, or alterations occurring

after the date of manufacture. In no case shall the Company be liable for

any consequential or incidental damages for breach of this or any other

Warranty, expressed or implied whatsoever, even if the loss or damage is

caused by the Company’s negligence or fault. Some states do not allow

the exclusion or limitation of incidental or consequential damages, so the

above limitation or exclusion may not apply to you. This Warranty gives

you specific legal rights, and you may also have other rights which vary

from state to state.

from defects in materials and workmanship under normal use and ser-

vice for a period of three years from date of manufacture. System Sensor

makes no other express warranty for this air duct smoke detector. No

agent, representative, dealer, or employee of the Company has the author-

ity to increase or alter the obligations or limitations of this Warranty. The

Company’s obligation of this Warranty shall be limited to the repair or

replacement of any part of the air duct smoke detector which is found to

be defective in materials or workmanship under normal use and service

during the three year period commencing with the date of manufacture.

After phoning System Sensor’s toll free number 800-SENSOR2 (736-7672)

for a Return Authorization number, send defective units postage prepaid

to: System Sensor, Repair Department, RA #__________, 3825 Ohio

D500-07-00

I56-432-11R

DETECTOR TEST LOG

Detector Identification Information

Manufacturer and

Serial

Date

Detector Model:______________________ Number:______________________ Installed: ___________________

Description of Detector Location:

________________________________________________________________________________________________

Test Results and Maintenance Data

Date

Tested

Test

Description

Test

Results

Maintenance

Performed

Comments

_______

_________

______

__________

______________________

D500-07-00

I56-432-11R

2001 System Sensor

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