INSTALLATION
16 Copyright © 2009 Mastervolt / August 2009 / Whisper 6 / 10 - 3000RPM for mobile applications / EN
Roof mounted radiators
The radiators 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 roof mounted radiators are more sensitive
for air traps (see figure 11). When having enough space it
would be ideal to have the radiators vertically mounted on
the roof. Note that the expansion tank should be above the
radiator.
When having the radiators horizontally mounted on the
roof (refer to figure 21) enough space (50 mm) should be
between the roof and the radiator fan to have a free flow of
air. When the radiators are 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.
Figure 21: Two examples of top mount radiators
3 TWO SPEEDS FAN (OPTIONAL)
To keep the noise as low as possible the fans of the
radiators can run at two different speeds. As option a
control box is available which can be used to drive the
fans with two speeds, depending on the load of the
generator. When using 12/24V DC to drive the fans (see
chapter 4.7), in normal mode the electric motors of the
fans are connected in series and run at low speed. In this
mode they almost produce no noise. Only when necessary
- this is controlled by thermostat switches - the fans are
switched in parallel and will blow at full speed.
The same is achieved with 230 V fans with help of a
transformer (refer to the connection diagrams in paragraph
4.6).
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.
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 22: 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 23. Ways to prevent water to get in
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