www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector
PROTECTION AGAINST MOISTURE DAMAGE
It is important to take proper precautions during installation to
ensure that moisture will not come in contact with the electrical
connections of the system. The integrity of the system regarding
moisture protection must be maintained for proper operation and is
the responsibility of the installer.
If conduit is used, the use of proper conduit installation techniques,
breathers, glands, and seals is required to prevent water ingress
and/or maintain the explosion-proof rating.
Conduit drains must be installed at water collection points to
automatically drain accumulated moisture. Conduit breathers
should be installed at upper locations to provide ventilation and
allow water vapor to escape. At least one breather should be used
with each drain.
Conduit raceways should be inclined so that water will flow to low
points for drainage and will not collect inside enclosures or on
conduit seals. If this is not possible, install conduit drains above the
seals to prevent the collection of water or install a drain loop below
the detector with a conduit drain at the lowest point of the loop.
POWER SUPPLY REQUIREMENTS
Calculate the total detection system power consumption rate in
watts from cold start-up. Select a power supply with adequate
capability for the calculated load. Ensure that the selected power
supply provides sufficient regulated and filtered output power for
the entire system. If a back-up power system is required, a
float-type battery charging system is recommended. If an existing
source of power is being used, verify that system requirements are
met.
TRANSPORT COVER
The Transport Cover (see Figure 4) keeps dust and particles out of
the smoke chamber that may enter during transport, handling, or
installation. It should remain fastened on the detector through the
installation process.
IMPORTANT
Remove the cover
only
after installation is complete and prior to
powering the detector for the first time.
MOUNTING LOCATION OPTIONS
Ceiling Mount
The U5015 is intended for surface mounting. It is normally mounted
on the ceiling no less than six inches from a side wall (See Figure 5).
The exact location of the detector must be determined by an
evaluation based on engineering judgement, or if possible, by field
tests.
Wall Mount
The U5015 can also be mounted on a side wall (See Figure 6). The
exact location of the detector must be determined by an evaluation
based on supplemented engineering judgement, or if possible, by
field tests.
IMPORTANT
Whenever possible, select a mounting orientation where the LED is
visible to personnel within the area.
MOUNT THE DETECTOR
Using three No. 8 flat head screws (or equivalent) placed through
the counter bored holes in the detector flange, secure the detector
junction box to the surface location.
WIRING CABLE REQUIREMENTS
Always use proper temperature rated cabling type and diameter for
input power as well as output signal wiring. 14 to 18 AWG shielded
stranded copper wire is recommended.
