Datasheet - Distech Controls

Datasheet - Distech Controls
 Datasheet
PDCSY-SD-622
Duct Smoke Detector
Overview
The PDCSY-SD-622 duct smoke detector operates on the
obscuration principle, using infrared technology and is
designed specifically to cope with the difficult measurement
conditions in air ducts, such as high velocity and levels of dirt
accumulation. The relay output is either auto or manual reset
relay output on detection of smoke.
Features & Benefits
 Manual or auto reset
 Fault relay output
 Self-test feature
Product Warranty & Total Quality Commitment
Our products carry a two-year warranty. Distech Controls is an ISO 9001 registered company
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PDCSY-SD-622
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Model Available
PDCSY-SD-622
Duct smoke detector
How It Works
The sensor works by using an infra-red transmitter and receiver fitted to the PCB inside of the housing. The transmitting device
sends a beam, which is reflected from a mirror in the end of the 300mm long probe, and the receiving device then receives this
beam when there are no obstacles, like smoke partials in the tube. If smoke is present, then this will disturb the beam, and the
receiver will lose the signal and an alarm will be activated.
On power up the PDCSY-SD-622 will start an automatic calibration procedure, the power from the TX device will increase in
small steps, just until the RX device receives enough signal to validate the “link”. This is stored in the volatile memory for any
further use, or until a new power on. Now any obstacles, like smoke will force an alarm.
Recommendations
 The PDCSY-SD-622 has a probe length of 300mm and should NOT be used in ducts with a diameter or square size greater
than 450mm, unless the smoke detection is intended as a secondary non-life safety action with areas served being covered
by smoke detection connected to a fire alarm system that is able to shut-off the ventilation fans, as it will not monitor the
whole of the duct.
 Units should NOT be mounted where ambient sunlight will fall on the photocell.
 Units should never be mounted at or near sharp bends in ductwork, as turbulence and side currents can carry the smoke
away from the probe.
 The PDCSY-SD-622 is an optical beam detector and therefore, air velocity has little effect on performance. However,
careful positioning of the detector is required if optimum detection is to be achieved. The detector should always be fitted
with the holes in the sensing tube parallel to the airflow.
 Units should not be mounted close to supply or extract fans.
 With large installations, where several ducts collect into a common duct, consideration must be given to dilution of smoke
and rate of airflow. For example, 10 small ducts may feed at different points into one large main extract duct, and if only one
smoke detector is fitted in the main extract duct, the position can arise where one duct is feeding smoke and nine are
feeding clean air. The amount of smoke is therefore diluted by 90%, and if this is coupled with a high flow rate, the smoke
may not be detected for the minimum operating period of 1 second, resulting in no alarm being generated. It may be
necessary to mount 10 detectors in each of the small ducts to guarantee correct operation.
Changing Reset Modes
Manual to Auto reset
Press and hold the external reset button (see page 4 for location). After approx. 5 seconds, the internal green LED will go off
for 1 second. Release the button and the device is now in auto reset mode. The PCB mounted LED will be constantly lit green.
Auto to Manual reset
Press and hold the external reset button (see page 4 for location). After approx. 5 seconds, the internal green LED will go
orange and the external LED will go red for 1 second. . Release the button and the device is now in manual reset mode. The
PCB mounted LED will be constantly lit green.
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PDCSY-SD-622
www.distech-controls.eu
Calibration & Alarm Condition
While the detector is auto-calibrating, the internal LED will flash red 6 times a second. When calibration is finished, the LED
will change to orange for a few seconds, the calibration is being stored in the volatile memory.
The PCB LED will then be continuously lit green, this also indicates that the sensor is powered correctly and not in alarm.
If the detector is in alarm or a fault has occurred, the internal & external LED’s will change to red.
Under normal operating conditions the relay is energised. Therefore, if any fault develops the relay will de-energise shutting off
the equipment connected to the relay, i.e burner or circulating fan, rendering the installation safe.
Relay status
• Un-powered
• Powered
• Alarm
Open
Closed
Open
Self-Test, Failure Mode & Manual Reset
 The output of the PDCSY-SD-622 can be manually overridden, to check integrity of the field wiring. To operate press the
PCB mounted button. In self-test mode both relay outputs will open, the external and the internal LED will be red. To
operate press the PCB mounted button.
 The external LED will flash red if the detector fails.
Installation
1.
The PDCSY-SD-622 should only be installed by a competent, suitably trained technician, experienced in installation
with hazardous voltages. (>50Vac & <1000Vac or >75Vdc & 1500Vdc)
2.
Ensure that all power is disconnected before carrying out any work on the PDCSY-SD-622.
3.
If the sensor is mounted outside, it is recommended that the unit be mounted with the cable entry at the bottom. If the
cable is fed from above then into the cable gland at the bottom, it is recommended that a rain loop be placed in the
cable before entry into the sensor.
4.
Drill a 22mm (0.87”) diameter hole, make sure to align the holes in the probe so that they point into the air flow, not at
right angles to it. Drill two holes at 85mm (3.35”) centres and fix the IP65 housing to the duct with appropriate screws.
5.
Remove the front cover by twisting the lid and separating from the main body.
6.
Feed the cable through the waterproof gland and terminate the cores at the terminal block. Leaving some slack inside
the unit, tighten the cable gland onto the cable to ensure water tightness.
7.
Maximum cable is 2.5mm², care must be taken not to over tighten terminals.
8.
Ensure the supply voltage is within the specified tolerances.
9.
Replace the lid tightly.
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PDCSY-SD-622
www.distech-controls.eu
Connections
1.
2.
3.
4.
5.
6.
Fault Output
Fault Output
Smoke Detection Output
Smoke Detection Output
Supply
Supply
Common
Normally Closed*
Common
Normally Closed*
+24Vac/dc, ±20%
0V
1
COM
* See alarm conditions on page 3
2
NC
RELAY
OUT
FAULT
3
COM
4
NC
RELAY
OUT
SMOKE DET.
5
+IN
6
GND
SUPPLY
IN
24Vac/dc
TEST
Test
button
LED
Product Specification
Supply
24Vac/dc, ±20%
Power consumption
50mA max.
Housing:
Relay outputs (smoke & fault)
SPST 2A @ 48V
Material
Dimensions
ABS (flame retardant type VO)
116 x 106 x 52mm
(4.57 x 4.17 x 2.05”)
Dimensions
300 x 20mm dia.
(11.81 x 0.79”)
Plastic
Probe:
Minimum duct size
Maximum duct size
100 x 320mm (3.94 x 12.60”)
450 x 450mm*
(17.72 x 17.72”)*
LED indication
ON in alarm
Alarm relay (selectable)
Manual or auto reset
Material
Protection
IP65 (housing only)
Ambient range:
Temperature
RH
10 to 40°C (50 to 104°F)
20 to 80% non-condensing
Country of origin
Denmark
The products referred to in this data sheet meet the requirements of EU Directive 2004/108/EC
Specifications subject to change without notice.
Distech Controls and the Distech Controls logo are trademarks of Distech Controls Inc.; LonWorks is a registered trademark of Echelon
Corporation; NiagaraAX Framework is a registered trademark of Tridium, Inc. ; ARM Cortex is a registered trademark of ARM Limited ; BACnet
is a registered trademark of ASHRAE ; BTL is a registered trademark of the BACnet Manufacturers Association; Windows, Visual Basic.Net are
registered trademarks of Microsoft Corporation. EnOcean is a registered trademark of EnOcean GmbH. All other trademarks are property of
their respective owner. Page 4/4
PDCSY-SD-622
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