Replacing Control Unit - Webasto Air Top Evo 40 Workshop Manual

Air Top Evo 40 / Air Top Evo 55

9.2.3 Replacing control unit

9.2.3.1 Removal
1. Remove heater (see 8.7.1.1).
2. Remove housing parts (see 9.2.1).
3. Remove screws (5, Fig. 903).
4. Disconnect connectors on control unit (4).
5. Pull out control unit (4) upward.
No repairs may be carried out on the control unit.
9.2.3.2 Installation
1. Insert plug connections on control unit as shown in Fig.
701.
2. Fasten control unit (4, Fig. 903) with screws (5).
3. Tighten screws (5) to 3.0 ± 0.3 Nm.
4. Install housing parts (see 9.2.2).
5. Install heater (see 8.7.1.2)
6. Check CO setting and adjust if necessary
2
(see Section 6.3).
9.2.4 Replacing blow-out temperature sensor
9.2.4.1 Removal
1. Remove heater (see 8.7.1.1).
2. Remove housing parts (see 9.2.1).
3. Disconnect plug connection X3 from control unit (4, Fig.
903).
IMPORTANT
Do not pull the cables.
4. Lever blow-out temperature sensor (9) out of heat
exchanger's ribs using a suitable tool (see Detail A).
5. Remove blow-out temperature sensor (9).
9.2.4.2 Installation
1. Position blow-out temperature sensor (9) and press it
into place by hand.
2. Make sure that blow-out temperature sensor (9) is
properly positioned in heat exchanger (8).
3. Connect plug connector X3 on control unit (4).
4. Install housing parts (see 9.2.2).
5. Install heater (see 8.7.1.2)
9.2.5 Replacing heating air fan
9.2.5.1 Removal
1. Remove heater (see 8.7.1.1).
2. Remove housing parts (see 9.2.1).
3. Position a pair of long-nose pliers from the front between
the two locking lugs on the motor shaft. Hold heating air
fan (1, Fig. 903) with one hand and simultaneously and
carefully spread two lugs with a slight twisting
movement. Pull off heating air fan (1).
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NOTE
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9.2.5.2 Installation
1. Make sure locking lugs are undamaged.
2. Slide heating air fan (1, Fig. 903) onto motor shaft until
engaging of lugs on both sides is audible at stop.
3. Install housing parts (see 9.2.2).
4. Check smooth running of heating air fan (1) by hand,
then listen for any noises when switching on later.
The sensor magnets on the heating air fan (1) must be
free from chips containing iron, etc.
5. Install heater (see 8.7.1.2)
9.2.6 Replacing drive unit
IMPORTANT
Only replace the drive unit (2, Fig. 903) with a drive unit with
the same performance data and the same ID No.
9.2.6.1 Removal
1. Remove heater (see 8.7.1.1).
2. Remove housing parts (see 9.2.1).
3. Remove heating air fan (1) (see 9.2.5.1).
4. Remove control unit (4) (see 9.2.3.1).
5. Remove screws (3).
6. Remove drive unit (2) toward front.
IMPORTANT
Do not lay drive unit on combustion air or heating air fan!
7. Remove and discard flat seal (7).
Repair
904