17
D
S
GB
F
Electrical system
Electrical lines, switchgear and controllers must be
positioned in the vehicle in such a manner that per-
fect performance under normal operating conditions
is not impaired (e.g. due to the effects of heat,
moisture and similar).
The pilot lamp (incorporated in the control unit)
should be within the diver's field of view or it should
be readily visible without entailing major effort.
The following cable cross-sections between battery
and heater must be maintained to ensure that the
maximum permissible voltage loss in the cables of
0.5 V at 12 V, and 1 V at 24 V rated voltage, is not
exceeded.
Length of the supply cable “Plus” (L+ red)
and “Minus” (L- brown), together
• < 5 m = cable cross section 2.5 mm
2
• 5 m – 8 m = cable cross section 4 mm
2
If the plus cable is to be connected to the fuse box
(e.g. Cl. 30), then the vehicle's own cable from the
battery to the fuse box must be taken into account
when calculating the total cable length and, if neces-
sary, be newly dimensioned.
Apply contact protection grease to the plug and
earth connections outside the interior space.
Care needs to be taken that the insulation of electric
wiring cannot be damaged due to fraying, kinking,
damage, pinching or the effects of heat.
Electrical plug and earth connections have to be free
of corrosion and tight.
In the case of watertight plugs, plug chambers which
are not used need to be sealed with a blind plug in
a dirt and water tight manner.
Apply contact protection grease to plug and earth
connections which are not used indoors.
In stationary heating mode, electricity from the
vehicle’s battery is consumed; this electricity
is recharged by the electric generator during
a subsequent ride.
If the travelling time up to the next start of the
heater is as a rule shorter than the preheating time
(short-distance drivers), then the battery needs to
be checked at regular intervals (depending on its
rating) and possibly recharged. This can either be
done out by means of a battery charger or by
covering longer distances in between.
Rule of thumb:
minimum travelling time = preheating time
ATTENTION!
Permissible suction and pressure level
Pressure level from the vehicle's tank to the dosing
pump: a = max. 3 m
Suction level with a pressureless vehicle tank:
b = max. 1 m
Suction level with a vehicle tank in which fuel tapping
produces a vacuum (valve with 0.03 bar in the tank
closure):
b = max. 0.4 m
Manometric lift from the dosing pump
to the
AIRTRONIC
:
c = max. 2 m
ATTENTION!
Check the tank venting.
L –
L +
+
–
