Webasto Thermo 90 ST Service And Repair Manual - page 37
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31
Webasto Product N.A., Inc.
THERMO 90 ST
SERVICING WORK
The opening of the exhaust pipe must not point towards
the front of the vehicle (see Figure 24).
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 your local jurisdiction for statutory
regulations for other requirements that may be in force.
8.7
R
EMOVAL
AND
I
NSTALLATION
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
8.7.1
H
EATER
, R
EMOVAL
AND
I
NSTALLATION
8.7.1.1 R
EMOVAL
1. Disconnect the battery.
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 I
NSTALLATION
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 (44 lb-in).
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.
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.
8.7.2
C
HANGING
THE
C
IRCULATING
P
UMP
NOTE:
The process for changing the
circulating pump is the same irrespective of
whether the heater is installed or removed.
Change as described in 9.2.1.
8.7.3
C
HANGING
THE
T
EMPERATURE
L
IMITER
NOTE:
The process for changing the
temperature limiter is the same irrespective of
whether the heater is installed or removed.
Change as described in 9.2.2.
8.7.4
C
HANGING
THE
T
EMPERATURE
S
ENSOR
NOTE:
The process for changing the
temperature sensor is the same irrespective of
whether the heater is installed or removed.
Change as described in 9.2.3.
8.7.5
C
HANGING
THE
C
OMBUSTION
A
IR
F
AN
NOTE:
The process for changing the
combustion air fan is the same irrespective of
whether the heater is installed or removed.
Change as described in 9.2.4.
8.8
S
TART
-
UP
After you have installed the heater, bleed the coolant
circuit and the fuel supply system carefully. Comply with
the instructions given by the vehicle manufacturer when
doing this. During the trial run, check all coolant and
fuel connections for leaks and to ensure that they are
secure. If the heater suffers a fault during operation, the
fault must be located and remedied (see section 5).