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INSTALLATION
Figure 17: Making use of the space below the floor to get an
optimal flow of air through the radiators
Side mounted radiators
Most effective and easy is to mount the radiator in the side of
the vehicle, if possible below the level of the top of the engine.
A louvered grid should protect the radiator from rain and
objects, but must not block the airflow. The fan should be
inwards which causes the air to blow outwards. A disadvantage
of having the radiator in the side is possibly more noise of the
electric fan and a flow of air that could be felt by people passing
by.
A free flow of air should be guaranteed. The ventilation
connection of the cooling system that goes to the expansion
tank, should be in the outgoing coolant flow on top of the
radiator.
Figure 18: Side mounted radiator
10
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 may conflict with the possible need to keep
the vehicle as low as possible.
Another disadvantage is that the piping has to go through the
roof which requires connections to be made waterproof.
Moreover, a roof mounted radiator is more sensitive for air
traps (Figure 10). When there is 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
(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.
Figure 19: Two examples of a top mount radiator
2.5.2.3
Two-speed 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 produces very little 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-speed fan control, in
order to keep the system as simple as possible.
W-SQ 27 kVA / 25 kW — October 2014 — EN
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