906
9 Repair
Air Top 2000 S
1
3
2
Fig. 904 Replacement of Combustion Air Fan (Assembly)
1 Screw (5)
2 Gasket
3 Combustion Air Fan
Before assembly always
renew gasket.
Combustion air fan must not be
disassembled any further
9.2.4.2 Installation
1. Ensure that sealing surfaces on combustion air fan
and on heat exchanger are not damaged.
2. Place new gasket (2, Fig. 904) onto flange of
combustion air fan (3).
3. Place combustion air fan into assembly position and
mount using screws (1). Torque screws (1) to 6 Nm.
4. Place wire insulating mesh into position on the
heat exchanger (1, Fig. 903).
5. While slightly spreading the lower housing shell,
place over heat exchanger until guide slots
engage with pins on fan housing.
6. Fit new seal (2, Fig. 903) on heater mount base.
7. Install control unit (see 9.2.2.2).
8. Install upper housing shell, air inlet and air outlet.
9. Install air heater (see 8.7.1.2).
10. Check CO
2
setting and adjust as required (see 6.2).
• Loose wire strands of the mesh must be cut off
to prevent contact with the temperature sensor.
• Ensure a secure fit between the heat exchanger,
insulating mesh, and the upper housing.
• An overly worn, damaged or flattened insulating
mesh must be replaced with a new mesh.
CAUTION
To ensure the proper function of the heater and to
prevent malfunctions of the temperature sensor,
the following must be observed when installing the
wire insulating mesh:
• The wire insulating mesh must be installed as
shown in Fig. 903 to prevent unwanted contact
with the temperature sensor terminals.
