GREYSTONE HAS AN ISO 9001 REGISTERED QUALITY SYSTEM

DUCT SMOKE DETECTOR

DSD SERIES

RECTANGULAR

SQUARE

PRODUCT DESCRIPTION

The DSD Series, 4-wire photoelectric duct smoke

detector features a pivoting housing that fits both

square and rectangular footprints and mounts

to round or rectangular ductwork. This unit

senses smoke in the most challenging conditions,

operating in airflow speeds of 100 to 4,000 feet

per minute, temperatures of –20°C to 70°C (–4°F to

158°F), and a humidity range of 0 to 95% (non-

condensing). A plug-in sensor head offers improved

false alarm immunity and simple installation,

testing, and maintenance. An improved cover

design isolates the sensor head from the low-flow

feature for simple maintenance.

The DSD housing provides ample wiring space,

a ¾-inch conduit knockout, and built-in short

circuit protection to prevent damage to sensitive

components during installation. High contrast

terminal designations make wiring easy. With its

2:1 sensor-to-power capability, the power board of

the DSD may be used to monitor a second sensor,

D4S, simultaneously (i.e., supply and return side).

As many as 50 detectors can be interconnected.

When one unit senses smoke, all interconnected

detectors will switch their relays; only the detector

sensing smoke will go into alarm, thus pinpointing

the fire source.

All detectors must be used with a metal sampling

tube, DST series.

SIZE

Rectangular Dimensions: 37cm (14.38in) L, 12.74cm (5in) W, 6.36cm

(2.5in) D

Square Dimensions: 19.7cm (7.75in) L, 22.9cm (9in) W, 6.35 (2.5in) D

WEIGHT

1.14kg (2.5lbs)

OPERATING TEMPERATURE -20 to 70°C (-4 to 158°F)

STORAGE TEMPERATURE

-30 to 70°C (-22 to 158°F)

OPERATING HUMIDITY

0 to 95 %RH, non-condensing

AIR DUCT VELOCITY

0.5 to 20.32 m/sec (100 to 4000 ft/m)

ELECTRICAL RATINGS

DSD120/240

DSD120/240

DSD120

DSD240

POWER SUPPLY VOLTAGE

20-29 Vdc

24Vac 50-60Hz

120Vac 50-60Hz

240 Vac 50-60Hz

INPUT CAPACITANCE

270 µF maximum 270µF minimum N/A

N/A

RESET VOLTAGE

3.0 Vdc minimum 2.0 Vac minimum 10 Vac minimum 20 Vac minimum

REST TIME

(BY POWER DOWN)

0.6 sec. max.

0.6 sec. max.

0.6 sec. max.

0.6 sec. max.

POWER UP TIME

35 sec. max.

35 sec. max.

35 sec. max.

35 sec. max.

ALARM RESPONSE TIME

15 seconds

15 seconds

15 seconds

15 seconds

SENSITIVITY TEST

See detector

label

See detector

label

See detector

label

See detector

label

CURRENT REQUIREMENTS

MAX. STANDBY TEST

21 mA @ 24 Vdc

65 mA RMS @ 24

Vac 60 Hz

20 mA RMS @

120 Vac 60 Hz

10mA @ 240 Vac

60 Hz

MAX. ALARM CURRENT

65 mA @ 24 Vdc

135 mA RMS @

24 Vac 60 Hz

35 mA RMS @

120 Vac 60 Hz

18 mA RMS @

240 Vac 60 Hz

CONTACT RATINGS

Alarm Initiation Contacts (SPST): 2.0A @ 30 Vdc (resistive)

Alarm Auxiliary Contacts (SPST): 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 (SPST): 2.0A @ 30 Vdc (resistive); 2.0A @ 125 Vac

(resistive)

SPECIFICATIONS