8 Servicing
HL 90
802
Fig. 801 Hot Air Temperatures with Drop of Pressure (12V Heaters)
The heating air intake temperature must not exceed
+30° C.
Heating air duct minimum inner diameter: 100 mm
Past a brandnig (Y union) a heating air duct inner
diameter of 80 mm is permitted.
Maximum air pressure difference between suction and
pressure side of heating air duct:
2.5 mbar (25 mm wc) 12V/24V to 09.97
4.0 mbar (40 mm wc) 24V from 10.97
or retrofit
When exceeding this value the temperature limiter is very
likely to respond. The heating air hose must be secured at
its joints.
The air heater, when used in the ventilation mode of
operation, may also be used without any further
accessories when observing the air intake temperature
limitation (a heating air flow short circuit should be
avoided).
8.6.2 Fuel Supply
Fuel is tapped from the fuel reservoir of the vehicle or
from a separate fuel tank. Permitted pressures at the fuel
tapping location are listed in Fig. 802.
8.6.2.1 Fuel Tapping
Vehicles with big engines (trucks) fuel tapping must be
from the fuel reservoir or a separate unpressurised fuel
tank (Fig. 803, 804 and 805). This separate fuel tapping
avoids an influence on the pressure.
Fig. 802 Fuel Supply
500
1. Free flow
20 °C
2. Partial restriction
∆P = 0 mm wc
∆P = 6 mm wc
∆P = 25 mm wc
3. Max. pressure drop
(Temperature limiter B2 responds at 175 °C)
135 °C
800
R100
172 °C
800
Total pipe length 2,5 m
500
∅100
50% of cross section = ∅ = 70 mm
124 °C (Max. temperature)
20 °C
20 °C
Permitted fuel feed
suction height S (m)
At max. permissible negative
pressure (bar) in fuel tank
0.00 –0.10
0.50 –0.06
1.00 –0.02
max. 3 m
max. 3 m
max. 10 m
i ø 2 mm
i ø 2 mm
max. 10 m
max. 3 m
iø 2-3mm
iø 2-3mm
max. 2,5 m
S
HL 90
HL 90
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