Technical data

8 Servicing Thermo 230 / 231 / 300 / 301 / 350
806
When installing a shut-off device in the return line a clearly
visible information label must be provided.
CAUTION
Operation with the return line shut off causes damage to
the fuel pump. Fuel may escape. Danger of fire.
Loose fuel lines must be secured in order to avoid
sagging.
The installation of an additional fuel pump is not allowed.
Fuel lines permissible dimensions:
• inner diameter for suction and return line:
6 mm (other diameters upon request).
• max. permissible length for each suction and return
line: 10 m
• Max. permissible suction height: 2 m
• Max. permissible priming pressure: 0.3 bar for suction
and return line.
8.6.2.2 Fuel Filter
A fuel filter supplied as deliverable item or cleared for use
by Spheros is to be fitted.
Installation position possibly vertical with horizontal
direction of flow. To avoid operating malfunctions replace
filter or filter cartridge once a year or more often if fuel is
contaminated.
8.6.3 Combustion Air Supply
CAUTION
Observe official regulations concerning the installation
(see 1.6).
Combustion air must under no circumstances be
extracted from rooms with persons. The combustion air
inlet must not point towards the forward direction of
motion.
It must be located so that no clogging by contamination,
impact of snow, or intake of splash water is to be
expected.
The combustion air intake and exhaust outlet is to be
located so that no air pressure difference builds up in any
operating condition of the vehicle.
Permissible dimensions of combustion air intake line:
• inner diameter: 55 mm
• max. length: 5 m without the exhaust extension
• max. bend: 270°
The combustion air inlet must be located so that no
exhaust fumes can enter.
NOTE
If the combustion air intake line cannot be routed upwards
to the heater, a water drain hole Ø 4 mm is to be provided
at the lowest point.
If the heater is located near the fuel tank in a common
installation compartment, combustion air must be taken
in from and the exhaust routed to the exterior. The
feedthroughs must be sealed against splash water.
If the heater is located in a closed installation box, a vent
port is required:
Thermo 230, 231, 300 and 301 30 cm
2
Thermo 350 35 cm
2
If the temperature in the installation box exceeds the
permitted ambient temperature of the heater (see
Technical Data), the vent port must be enlarged consult-
i
ng Spheros.
8.6.4 Exhaust Line
CAUTION
Observe official regulations concerning the installation
(see 1.6).
The exhaust pipe outlet opening must not point in the
direction of motion.
The exhaust pipe outlet opening must be located so as not
to expect clogging by snow or mud.
The combustion air intake and exhaust outlet is to be
located so that no air pressure difference builds up in any
operating condition of the vehicle.
Information label