Velocity VDOT-ASD-100 User manual

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VDOT-ASD-100
Aspirating Smoke Detector
User’s Manual

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Content&
Introduction*.................................................................................................................................*3*
Features*.........................................................................................................................................*3*
Specification*.................................................................................................................................*5*
Sampling*Pipework*Design*.....................................................................................................*8*
Considerations+............................................................................................................................................................+8+
Design+Guidelines+...................................................................................................................................................+11+
Installation*.................................................................................................................................*14*
Mechanical+Installation+........................................................................................................................................+14+
Electrical+Installation+............................................................................................................................................+16+
Front*Panel*.................................................................................................................................*21*
Control+.........................................................................................................................................................................+22+
Display+.........................................................................................................................................................................+22+
Parameter+Setup+......................................................................................................................................................+27+
Parameter*Functions*...............................................................................................................*29*
Commissioning*..........................................................................................................................*33*
Commissioning+Check+List+..................................................................................................................................+33+
Maintenance*...............................................................................................................................*35*

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Introduction*
VDOT-ASD-100 is aspirating smoke detectors
especially developed for small area very early
warning fire detection.
Most early warning fire detection products
were seeking very high sensitivity smoke
detection to protect a large area; while VDOT-
ASD-100 is aiming at protecting proper size of
area. In fact, because of the nature of the
aspirating smoke detection, the bigger the
detection area is the less sensitive the system
becomes. In order to provide very early
warning fire detection in a large area
application, the alarm threshold of the
detector must be set to very sensitive and is
closed to environment background smoke
level. This makes the system very easy to have
unwanted or false alarms.
The prefer detection zone size of VDOT-ASD-100 is only about one quarter to one half of that
of the popular product on market (typically 2000sqm); while it provides much better
performance of very early fire detection and better ability immune to false/unwanted
alarms.
Features*
VDOT-ASD-100 uses high power, short wavelength blue LED as the detection light source. It
is very sensitivity to small smoke particles generated during the incipient stage of a fire, at
which time remaining invisible to human eyes. The highest alarm sensitivity of ASD high
sensitivity smoke detector is 0.005%/m, which is 1000 times more sensitive than a
conventional point type smoke detector.
l Alarm&Sensitivity&Range:&0.005~20%/m&
l Four&Alarm&Levels&

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l Up&to&100m&Single&Pipe&Length*&(18&Sampling&Holes&Along&the&Pipe)&
l Up&to&25&Sampling&Holes*&(60m&Sampling&Pipe&Length)&
l 7&Relay&Outputs&
l 3&in&1&Control/Display/Programmer&Front&Panel&
l RS485&Network&
l Support&Modbus&RTU&Open&Protocol&
&
*Note: Maximum pipe length and maximum number of sampling holes cannot be achieved
at the same time. When maximum pipe length is the major design consideration, the
number of sampling holes must be reduced. On the other hand, when maximum number of
sampling holes is the major design consideration, the pipe length must be reduced.
*

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Specification*
Smoke Detection Principle
- Forward Light Scattering Mass Detection
Smoke Sensitivity
- Smoke Detection Range: 0.001~25%/m
- Alarm Sensitivity Range: 0.005~20%/m
Sampling Pipe
- Material: ABS/UPVC
- OD: 25mm
Maximum Pipe Length
- EN54-20 Class A: Maximum 40 holes totally
" Single Pipe
ü 100m (18 holes)
ü 60m (25 holes)
" Two Branch Pipes
ü 2x80m (2x15 holes)
" Four Branch Pipes
ü 4x 60m (4x10 Holes)
- EN54-20 Class B: Maximum 60 holes totally
" Two Branch Pipes
ü 2x60m (2x25 holes)
" Four Branch Pipes
ü 4x 60m (4x15 holes)
*Note ： Please refer to Velocity ASD Design manual for the relationship between pipe
length and the number of sampling holes.
The ASDFlow air sampling pipe network design tool can be used to calculate the
maximum transport time and sampling hole sensitivity.
&
Important Note:
Operation of the Detector beyond 12%/m obscuration is not allowed per the
National Fire Alarm Code (NFPA 72) guidelines.

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Alarm Levels and Time Delay
- Alert (0~60 sec.)
- Action (0~60 sec.)
- Fire-1 (0~60 sec.)
- Fire-2 (0~60 sec.)
Environment Smoke Learning
- 24hours, 365days Non-Stop Smoke Background Level Learning
Flow Detection
- Detection Principle: Heat Mass Detection
- Pipe Flow Normalize to 100%
- Flow High and Flow Low Fault
- Adjustable Flow Detection Sensitivity
- Adjustable Flow Fault Threshold
Relay Output
- 7 Relays on Termination Board (Configurable)
- Rating: 2A@30 VDC
General Purpose Inputs
- 4xGPIs (Configurable)
- GPI Functions: RESET/ISOLATE/SILENCE/TEST/MAINS FAULT/BATT. FAULT/POWER
FAULT/SENSITIVITY MODE 1/SENSITIVITY MODE 2/SCAN/UDI-1/UDI-2/UDI-4/UDI-5
*Note: UDI, User Defined Input
Communication
- RS-485 Network
- Maximum number of devices on Network: 250
- Built in repeater
- Maximum cable length between two adjacent devices: 1.2km
- Support Modbus RTU open protocol
Control
- <Reset>, <Isolate>, <Silence> & <Test> buttons
Display

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- 20 segment smoke level bargraph
- 6-digits Numerical LEDs Display
" Real Time Smoke Level
" Real Time Airflow Level
" Device Address
" Active Event & Codes
- 4 Fire Alarm Indicators
" Alert, Action, Fire 1, Fire 2
- 4 Fault Indicators
" Detector, Airflow, System, Auxiliary
- Isolated indicator
- Beeper
Programmer
" Access Password Controlled
" Bargraph and 6-digits 7-Numerical LEDs display the function.
" <Func.> <ï><ð> <+> <-> <↵> buttons to change settings.
Event Logs
- Number of Events: 25000
- Event Type: Alarm/Fault/Operation/Smoke/Flow/Auxiliary Gas Sensors
Operating Conditions
- Ambient Temperature: 0~40 ℃
- Sampling Air Temperature: -20~60 ℃
- Humidity: 10~95% RH Non-Condensing
Power
- 24 ±4.8 Vdc
- 175～320mA (Aspirators setting from 1 to 10）
Dimension
- Length=216mm
- Width=201mm
- Height=92mm
Weight
- Net Weight：2.5kg

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*
Sampling*Pipework*Design*
Aspirating system design is inherently simple. It is often possible to achieve good system
performance with very simple installations. There are however a few rules, which must be
adhered to, and these rules are equally applicable to all aspirating systems. The information
contained in this manual is intended as an overview only. For further information please see
the complete Velocity ASD Design Manual.
Considerations
o Primary'Detection'Sampling'Systems'
Are usually arranged to monitor the flow of air movement by the use of pipework and air
sampling points mounted directly in the airflow. This type of system is usually regarded as
supplementary to other forms of detection due to its limited response capability once the
air movement ceases.
In such a system when monitoring a single point of supply or extract, its system sensitivity
may be directly related as equal to the sensitivity of the central detector due to the
cumulative effect. In the case of a system monitoring more than one point of supply /
extract then the system sensitivity will only be determined in discussions with the
manufacturer or his representative.
Always locate the sampling points in a position to which smoke may reasonably be expected
to travel. This may sound obvious, but, for example, do not expect ceiling mounted sampling
points to operate satisfactorily if air flow prevents the cool smoke from an incipient fire from
reaching ceiling level. In this instance it is usually better to locate the sampling pipes directly
in the airflow (for example in an air conditioning unit air intake). There is no substitute for
carrying out smoke tests prior to installation of pipes to indicate suitable sampling point
location.
o Secondary'Detection'Sampling'Systems'
Are arranged such that the air sampling points are sited and spaced as if they are point type
smoke detectors. They can be positioned to satisfy NFPA 72, NFPA 76, BS 5839-1, BS 6266

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and local fire code requirements when the calculated relative sensitivity per air sampling
hole equates to a point detector. See Relative Sensitivity below.
o Maximum'Permissible'Transport'Time'
The time taken for a system to transport a sample from a protected area should not exceed
120 seconds (2 minutes). Transport times in excess of this must be the subject of a variation.
Shorter maximum transport times may be desirable in certain applications and should be
specified as part of the risk assessment. For example, Class A ASD systems are generally
designed with transport times of less than 60 seconds.
Maximum transport time can be directly affected by the installed sample pipe design, see
the following Figures. The 4-branch design will provide the shortest transport time.
Single branch system

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Two branch system
Four branch system