8 Service work Thermo 90 S / Thermo 90 ST
808
8.6.6 Exhaust line
The exhaust line (internal diameter 38 mm) can be
installed with a length of 0.5 m to 5 m and several bends
(360° altogether, minimum bending radius 85 mm). The
exhaust muffler is essential and must be installed near the
heater.
An attachment is required no further than 150 mm from
the end of the exhaust pipe to ensure that the angle of
90° ±10° is achieved.
Fig. 809 Exhaust pipe opening, installation position
The opening of the exhaust pipe must not point towards
the front of the vehicle (see Figure 809).
The exhaust pipe opening must be located so that it
cannot become clogged with snow and mud.
Rigid pipes of unalloyed or alloyed steel with a minimum
wall thickness of 1.0 mm or flexible piping of alloyed steel
only must be used as the exhaust line. The exhaust pipe
is secured to the heater using a clamping collar, for
example. See the statutory regulations for other
requirements.
Only for ADR:
The statutory regulation of ADR (Accord
européen relatif au transport international des
marchandises dangereuses par route) governing the
routing of the exhaust line, part 9 para. 9.2.4.7, must be
adhered to.
8.7 Removal and installation
CAUTION
When the heater is installed, only the following
dismantling or removal procedures are permitted
providing the upper cover cap is accessible and can be
removed, and there is sufficient room for removal:
– Changing the circulating pump
– Changing the temperature limiter
– Changing the temperature sensor
– Changing the combustion air fan
– Changing the control unit (Thermo 90 S/
Thermo 90 ST)
8.7.1 Heater, removal and installation
8.7.1.1 Removal
1. Disconnect the battery.
NOTE
Only disconnect plug connectors X12 and X13 on the
control unit in the Thermo 90 S heater with the control
unit flange-mounted on the combustion air fan.
2. Remove the upper cover cap.
3. Disconnect the wiring harness plug from the heater.
4. Disconnect the connection for the combustion air inlet
on the heater.
5. Unfasten the hose clips and pull the coolant hoses off
the heater.
6. Disconnect the connections for the combustion air
inlet and exhaust outlet on the heater.
7. Remove three screws and washers from the heater
holder.
8. Remove the heater.
8.7.1.2 Installation
1. Position the heater in its installation position and
screw in 3 screws with washers to attach it.
2. Connect the coolant hoses and secure with hose
clips. Tighten the hose clips to 5 Nm.
3. Secure the connection for the combustion air inlet on
the heater.
4. Secure the connections for the combustion air inlet
and exhaust outlet on the heater.
NOTE
Only reconnect plug connectors X12 and X13 on the
control unit in the Thermo 90 S heater with the control
unit flange-mounted on the combustion air fan.
5. Connect the wiring harness plug to the heater.
6. Put on the top cover cap and lock it in place.
7. Connect the battery.
8. Bleed the fuel supply system.
9. Bleed the coolant circuit.
10°
10°
Discharge direction
almost vertical 90° ±10°
