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INSTALLATION
Roof mounted radiators
The radiator on the roof is often the best option from the
point of view of keeping the noise of the fans away from
people and it will give the best result in dissipating the
heat. However, often this option conflicts with the possible
need to keep the vehicle as low as possible.
An other disadvantage is that the piping has to go through
the roof which requires provisions to be waterproof. Also
negative is that a roof mounted radiator is more sensitive
for air traps (see figure 10). When having enough space it
would be ideal to have the radiator vertically mounted on
the roof. Note that the expansion tank should be above the
radiator.
When having the radiator horizontally mounted on the roof
(refer to figure 19) enough space (50 mm) should be
between the roof and the radiator fan to have a free flow of
air. When the radiator is roof mounted there should be
protection against weather conditions. To avoid damage
while the vehicle is driving at high speed, the use of a
spoiler could be necessary.
horizontal
Figure 19: Two examples of a top mount radiator
3
TWO SPEEDS FAN (OPTIONAL)
To keep the noise as low as possible the fan of the
radiator can run at two different speeds. As option a
control box is available which can be used to drive the fan
with two speeds, depending on the load of the generator.
In normal mode the electric motor of the fan is powered by
a low voltage and runs at low speed. This is achieved by
means of a transformer. In this mode the fan almost
produces no noise. Only when necessary - this is
controlled by thermostat switches - the fan is switched to a
higher voltage and will blow at full speed (refer to the
connection diagrams in paragraph 4.5).
However, when not strictly necessary, we recommend
using the standard fan control instead of the two speeds
fan control, in order to keep the system as simple as
possible.
14
vertical
2.5.3
Dry exhaust system
1
GENERAL REMARKS
A dry exhaust muffler system should be as effective in
silencing the exhaust as a wet marine exhaust system
when applying the right mufflers. However noise could be
generated by vibrations in the mufflers and be transferred
to the chassis. Tacit factors like the length of specific pipe
sections could be important. It is very difficult to take these
factors into account.
Figure 20: Dry exhaust systems on vehicles
The standard Mastervolt exhaust kit contains the materials
to perform a professional installation. In the kit is a
stainless steel flexible bellow (hose) to allow for expansion
and to prevent vibrations to be transferred. Rubbers are
supplied to mount the mufflers flexible. The insulation
blanket for the flexible bellow and the resonance muffler
are also very effective in damping vibrations. Still it could
be that additional measures has to be taken like an extra
clamp in a vibrating section of pipe, insulation blankets on
other parts of the system and possibly even additional
mufflers.
When the exhaust is led through the roof of a
vehicle, measures has to be taken to prevent
rainwater to enter the system. Special rain
caps are available as an option.
Figure 21. Ways to prevent water to get in
November 2007 / Whisper 25 Ultra for mobile applications / EN
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