Webasto Air Top 2000 ST D Service And Repair Manual - page 38
Webasto Product N.A., Inc.
38
www.techwebasto.com
REPAIR
AIR TOP 2000 ST
9.2.3
C
HANGING
THE
C
ONTROL
U
NIT
9.2.3.1 R
EMOVAL
1. Remove the heater (see 8.7.1.1).
2. Remove the casing parts (see 9.2.1).
3. Open the catches on the hot air blower.
4. Pull the hot air blower (1, Fig. 30) off the motor
shaft by hand.
5. Disconnect the plug connectors on the control unit
(3).
6. Remove screws (2) and the control unit (3).
7. Complete the work on stripped-down components
(see 9.1.1).
NOTE: Do not carry out any repair work to the
control unit.
9.2.3.2 I
NSTALLATION
1. Place the control unit (3, Fig. 30) in the installation
position and attach with screws (2).
2. Tighten the screws to 0.7 ± 0.07 Nm (6 ± .6 lb-in).
3. Slide the hot air blower (1) onto the motor shaft
until the detente on both sides is heard to engage in
the shaft groove at the stop.
4. Connect the plug connectors at the sockets of the
control unit (3) as shown in Fig.11.
5. Position the casing parts (see 9.2.2).
6. Install the heater (see 8.7.1.2).
7. Check the CO
2
setting and adjust it if necessary (see
6.2).
8. Check that the hot air blower moves easily with
your hand. Check for any noise when you switch it
on later. The sensor magnets on the hot air blower
must be clear of ferrous chips, etc.
9.2.4
C
HANGING
THE
O
VERHEATING
S
ENSOR
9.2.4.1 R
EMOVAL
9.2.4.1 Removal
1. Remove the heater (see 8.7.1.1).
2. Remove the casing parts (see 9.2.1).
3. Remove the insulators (9, Fig. 30).
4. Disconnect the plug connector X5 on the control
unit (3).
CAUTION: Do not pull the cables.
5. Lever the overheating sensor (8) out of the ribs of
the heat exchanger (7) using a suitable tool (see
detail A, Fig. 30).
6. Remove the overheating sensor (8).
9.2.4.2 I
NSTALLATION
1. Measure the resistance of the overheating sensor
(8, Fig. 30) (see 6.3.3).
2. Position the overheating sensor (8, Fig. 30) on the
heat exchanger (7) and press it into place by hand.
IMPORTANT!
There must not be an electrical
connection between the sensor cables and the
sheet metal holder.
3. Ensure that the overheating sensor is correctly
positioned in the heat exchanger (7).
4. Connect the plug connector X5 at the control unit
(3). Check that the cables are routed in parallel
between the ribs on the heat exchanger.
5. Push the insulators (9) on to the heat exchanger.
6. Position the casing parts (see 9.2.2).
7. Install the heater (see 8.7.1.2).
9.2.5
C
HANGING
THE
C
OMBUSTION
A
IR
F
AN
9.2.5.1 R
EMOVAL
1. Remove the heater (see 8.7.1.1).
2. Remove the casing parts (see 9.2.1).
3. Remove the control unit (see 9.2.3.1).
NOTE: A total of 9 screw heads are visible on
the combustion air fan (5, Fig. 30). Of these the
5 outer screws are used to attach the
combustion air fan to the heat exchanger (7).
Only these screws should be removed.
4. Remove the screws (4).
5. Remove the combustion air fan (5) from the heat
exchanger (7), remove the seal (6) and dispose of it
separately.
6. Complete the work on stripped-down components
(see 9.1.1).
9.2.5.2 I
NSTALLATION
1. Ensure that the sealing surfaces on the combustion
fan (5, Fig. 30) and on the heat exchanger (8) are
not damaged.
2. Fit a new seal (7) on the flange of the combustion
air fan (5).