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A05-201-02

SAMPLING TUBE

FILTERS

CONDUIT HOLES

DUCT DETECTOR

HOUSING

PC BOARD

INSULATOR

DUCT DETECTOR

COVER

SAMPLING TUBE

MOUNTING

SCREWS

DETECTOR HEAD

EXHAUST

FILTER ADAPTER

DETECTOR BASE

INLET SAMPLING TUBE

(SUPPLIED SEPARATELY)

O-RINGS

FOAM

GASKETS

HOUSING

MOUNTING SCREWS

TEST MAGNET

TUBE

END

PLUG

Exploded View of

DH400ACDC Duct

Detector Components

Architectural/Engineering Specifications

The air duct smoke detector shall be a System Sensor

Model DH400ACDC Series Duct Smoke Detector. The

detector housing shall be UL listed per UL 268A

specifically for use in air handling systems. The detector

shall operate at air velocities of 500 feet per minute to

4000 feet per minute. The detector housing shall be

equipped with an integral mounting base capable of

accommodating either photoelectronic or ionization

detector heads. It shall be capable of local testing via

magnetic switch or remote testing using the RTS451KEY

Remote Test Station. The duct detector housing shall

incorporate an airtight smoke chamber in compliance with

UL 268A, Standard for Smoke Detectors for Duct

Applications. The housing shall be capable of mounting to

either rectangular or round ducts without adapter

brackets. An integral filter system shall be included to

reduce dust and residue effects on detector and housing,

thereby reducing maintenance and servicing. Sampling

tubes shall be installed after the housing is mounted to the

duct by passing through the duct housing. Terminal

connections shall be of the strip and clamp method

suitable for 14–18 AWG wiring.

Electrical Ratings – DH400ACDC

Power Supply Voltage

20 - 29 VDC

24 VAC 50 - 60 Hz

120 VAC 50 - 60 Hz

220/240 VAC 50 - 60 Hz

CURRENT REQUIREMENTS (USING NO ACCESSORIES)

Max. standby current

25 mA

35 mA RMS

20 mA RMS

20 mA RMS

Max. alarm current

95 mA

55 mA RMS

55 mA RMS

30 mA RMS

CONTACT RATINGS

Alarm initiation contacts (SPST)

2.0A @ 30 VAC/DC (0.6 power factor)

Alarm auxiliary contacts (DPDT)

10A @ 30 VDC

10A @ 277 VAC (0.75 power factor)

240 VA @ 240 VAC (0.4 power factor)

1/8 HP @ 120 VAC

1/4 HP @ 240 VAC

Trouble contacts (SPST)

0.3A @ 32 VDC (resistive)

ACCESSORY CURRENT LOADS AT 24 VDC

DEVICE

APA451

PA400

RA400Z

RTS451KEY

STANDBY

12mA MAX

0mA

0mA

0mA*

ALARM

30mA MAX

15mA MAX

7mA MAX

7mA MAX*

ANY COMBINATION OF ACCESSORIES MAY BE

USED SUCH THAT THE GIVEN CURRENT LOADS TOTAL:

100mA OR LESS IN THE STANDBY STATE,

150mA OR LESS IN THE ALARM STATE.

*NOTE: WHEN INITIATING AN ALARM, THE RTS451

REQUIRES 71mA MAXIMUM IN PRE-ALARM

AND 78mA MAXIMUM IN ALARM. NOMINAL

STANDBY CURRENT IS 0mA. ALARM CURRENT

IS 7mA MAXIMUM WHEN TEST MAGNET IS

REMOVED.