JL/X130 - 1680
17
6 Venting
6.1 General venting information for frame 4 and 5
In order to keep these units within the required operating temperatures under all operating limits they are
equipped with a very efficient cooling system. It consists of a powerful centrifugal fan system integral to the
unit mounted at the bottom, which blows air over a high dissipation heatsink. Cool air is drawn in both at the
top and bottom of the unit and after travelling over the internal heatsink fins, is exhausted at the top of the
unit. See 6.4 Air supply to enclosure. From here the warm air must be vented from the enclosure used to
house the drive. The unit will run cooler and hence be less stressed if the warm exhaust air is prevented from
mixing with the intake air. This can be achieved by the use of the optional venting kit. See below.
6.1.1 When venting kit impractical. Frame 4 and 5 Models JL/X 370 - 1680
For these models it is necessary to keep the exhaust air that is emitted from the top end of the fin section
seperated from the rest of the enclosure by constructing a duct that can evacuate the exhaust air from the
enclosure. If this requires an indirect route then you may need to use external fans to maintain the required
airflow. See 7 Product rating table for airflow ratings. Ensure against pollutants entering the port and you
may need to use a suitable grill if there is a danger of birds or vermin making it their home.
6.2 Venting kit for frame 4 JL/X 370 - 780
The venting kit comprises two steel ducts which are designed to telescope together. Hence the duct length
from the top of the drive is adjustable between 270mm to 538mm. It consists of three main components.
1) A lower duct which fits within the side cheeks directly above the heatsink exhaust area.
This is secured with 2 M5 screws. See 5 Mechanical Dimensions for fixing point drawing. The lower duct is
270mm long from the top edge of the JL/X.
2) The upper duct, which fits over the lower duct section, to extend the total length of the assembly.
It has a series of M5 side holes to allow adjustment. Once the desired height is established the upper duct
can be screwed to the lower duct through the selected hole, one screw per side. The useful length of the
extended duct may be adjusted in steps of approx. 20mm from 270mm to 535mm. The duct must be
inserted through a tight fitting rectangular hole in the roof of the enclosure (hole size 100mm x 252mm) and
protrude above it by 10-20mm. Then the gap between the duct and the enclosure roof must be sealed (e.g.
using tape or flexible filler) to ensure that the exhaust air and pollutants cannot enter into the enclosure.
3) A cowl which is fixed on top of the enclosure to prevent pollutants from dropping into the outlet.
The cowl is supplied with 4 off 50mm mounting pillars, and 4 M6 holes must be drilled in the roof of the
enclosure, to allow the mounting pillars to be fixed such that the cowl is positioned centrally over the duct.
The cowl will overhang the duct by 70mm all the way round. If there is a danger of birds or vermin entering
the exhaust port then it is recommend that a suitable grille is added round the edge of the cowl.
130
mm
280
mm
Hole in enclosure roof
100mm x 252mm