Connection to the Vehicle Cooling System
In the case of thermostat circuits only thermostats that
open at temperatures < 65°C should be used.
The heater is connected to the vehicle cooling system in
accordance with Fig. 3. The amount of coolant in the cool-
ing system should be at least 6 liters.
In principle, only the water hoses supplied by Webasto
should be used. If this is not the case, the hoses must at
least comply with the requirements of DIN 73411. The
hoses are to be routed without any kinks and – for proper
venting – in an upward pitch, if possible. Hose connections
must be secured against slipping off by means of hose
clamps.
NOTE:
The hose clamps must be tightened to a torque of 4 Nm.
Before the heater is started up for the first time or after the
coolant has been replaced, it must be ensured that the
cooling system is properly bled. Heater and piping should
be so installed that permanent self-bleeding of the system
is ensured.
Proper bleeding action can be recognized by the nearly si-
lent operation of the circulating pump. Insufficient bleeding
can result in tripping the resettable temperature limiter.
Fuel Supply
Fuel is drawn from the vehicle fuel tank or from a separate
fuel tank.
The values relating to the permissible pressure at the fuel
extraction point can be taken from the Table below.
permissible fuel feed height
H (m)
at max. permissible
overpressure (bar) in fuel
line
0.00 0.2
1.00 0.11
2.00 0.03
permissible fuel suction
height S (m)
at max. permissible
underpressure (bar) in fuel
tank
0.00 -0.10
0.50 -0.06
1.00 -0.02
l
1
+ l
2
10 m
l
1
1.2 m
l
2
8.8 m
Fig. 4: Fuel Supply
Thermo 90 / Thermo 90 S
4
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