INSTALLATION
EN/ Whisper 6 / 10 - 3000RPM for mobile applications / August 2009 / Copyright © 2009 Mastervolt / Août 2009 7
2.3 INSTRUCTIONS FOR OPTIMAL SOUND
AND VIBRATION INSULATION
Position the generating set as low as possible in the
vehicle. The generating set is secured to the base frame
by means of flexible engine mountings. This frame is
mounted in the vehicle with additional vibration dampers.
When it is possible to mount the unit directly on the
chassis of the vehicle this has advantages in preventing
vibrations by resonance.
2.3.1 Further recommendations
Whisper generating sets are standard equipped with a
sound cover. This sound cover has been designed to give
effective sound insulation. For optimum sound and
vibration dampening, the following factors should be
considered.
1 Most important is the structure on which the generator
is placed to be stiff. Directly below the rubber
mountings the structure should be supported vertically
to the chassis of the vehicle.
2 In larger vehicles a separate and insulated space for
the generator will help to damp the noise even further
3 Avoid mounting the generating set in close proximity
to thin walls or floors that may cause resonance.
4 Sound dampening is extremely poor if the generating
set is mounted on a light weight flimsy surface such
as plywood which will only amplify vibrations. If
mounting on a thinner surface cannot be avoided, this
should be at least be reinforced with stiffening struts
or ribbing. If possible, holes should be drilled or cut
through the surface to help reduce the resonance.
Covering the surrounding walls and floors with a
heavy coating plus foam will certainly improve the
situation.
5 Never connect the base of the generating set directly
to walls or tanks.
2.4 VENTILATION
2.4.1 General
The generating set normally draws air from the engine
room. Engine rooms with natural ventilation must have
vent openings of adequate size and location to enable the
generating set to operate without overheating. To allow an
ample supply of air within the temperature limits of the
generating set an opening of at least 100 cm2 is required.
A "sealed" engine compartment must have a good
extraction ventilator to maintain reasonable engine room
temperatures. High temperature of intake air reduces
engine performance and increases engine coolant
temperatures. Air temperatures above 40°C reduce the
engine power by 2% for each 5°C of rise. To minimise
these effects the engine room temperature must not be
more than 15ºC above the outside ambient air
temperature.
Apply a combination of ventilators, blowers and air intake
ducting to meet the temperature limit. The air inlet ducts
should run to the bottom of the engine room to clear fumes
from the bilge and to circulate fresh air. Air outlets should
be at the top of the engine room to remove the hottest air.
An engine room blower should be used as an extraction
ventilator to remove air from the engine room.
In cases where it is impossible to meet the above
mentioned temperature limit by using machine room
ventilation, connections are to be made for an air inlet
directly to the enclosure. With these connections the
generating set can be directly connected to an air duct.
Air inlets should be louvered, where appropriate, to protect
the engine room and to protect the generating set from
water spray. As an extra precaution, the fitting of a cowl
ventilator with a cover box located as high as possible, is
recommended.
Figure 5: Mounting of the Whisper generating set. X = wrong, V = OK
To Next Page
Loading...
Need help?
General
