Tyco MX4428 - Manual (Page 65)

Document: LT0273 MX4428 MXP Engineering / Technical Manual
Device Information and Programming
Issue 1.5 24 March 2006 Page 3-49
3.24 VLC-800MX VESDA LASERCOMPACT
3.24.1 GENERAL
The VLC800 is a derivative of the standard VESDA LaserCOMPACT product family, with the
primary difference that it communicates directly on the MX loop.
VESDA LaserCOMPACT detectors provide very early warning of potential fire conditions by
drawing air samples through 25mm pipe up to 80m long. Smoke is sampled through holes in
the pipe and transported to the detector by an integrated aspirator or fan. Holes are
positioned according to the application and often follow the spacing of standard conventional
point detectors. Where necessary, sampling points can be constructed using capillary
extensions.
The VLC800 alarm sensitivity can be set to between 0.005% obscuration / m and 20%
obscuration / m. A PC plugged into the VLC800 is required to set the sensitivity, to normalise
the airflow, and perform other setup functions. The sensitivity is NOT controlled at the
MX4428.
Refer to Tyco Safety Products UK publication 17A-03-VLC for further details on installing,
commissioning and servicing the VLC-800.
3.24.2 VLC800 SPECIFICATIONS
Environment: Indoor Application only
IP Rating: IP30
Operating Temperature:
Detector Ambient: -10°C to +39°C
Sampled Air: -20°C to +60°C
Relative Humidity: 10-95% non-condensing
Dimensions:
Height:
225mm
Width: 225mm
Depth: 85mm
Weight: 1.9kg
Sampling Network:
Maximum Area Coverage: 800m
2
Maximum Pipe length: 80m with up to 15* holes,
or 2 x 50m with up to 9* holes per pipe
Pipe Size: ID15 - 21mm
OD 25mm
‘*’ more holes may be used on networks designed using the VESDA Aspire
pipe modelling software.
External 24V dc:
Supply Voltage: 18 to 30V dc
Current Consumption: Standby: 225mA
Alarm: 245mA
MX Loop:
Normal:
300uA
Non operational (VLC off): 300uA
Alarm: 300uA
Alarm with external relay: dependant on the relay
Alarm with external LED: 3.3mA
Onboard relay: rated 2A @ 30V dc