9Repair DBW 2010 / 2016
911
9.2.5 Replacing fan thermostat
9.2.5.1 Removal
1. Remove nut (4, Fig. 908) and take off protective cap (3).
2. Disconnect electrical connection to fan thermostat (9).
3. Screw fan thermostat off angle bracket (5) and remove.
4. Carry out works on stripped down components (see 9.1.1).
9.2.5.2 Installation
1. Screw fan thermostat (9, Fig. 908) into angle bracket (5) by
hand.
2. Make the electrical connection.
3. Lay on the protective cap (3) and secure with the nut (4).
9.2.6 Replacing thermal fusible link
9.2.6.1 Removal
1. Remove nut (4, Fig. 908) and protective cap (3).
2. Disconnect electrical connection to thermal fusible link
(7) on terminal block (2).
3. Screw thermal fusible link out of screw plug (6) by hand
and remove.
4. Carry out works on stripped down components (see
9.1.1).
9.2.6.2 Installation
1. Screw thermal fusible link (7, Fig. 908) into screw plug (6)
by hand.
2. Make the electrical connection.
3. Lay on the protective cap (3, ) and secure with the nut (4).
9.2.7 Replacing control unit
9.2.7.1 Removal
1. Disconnect connector on control unit (1 or 3, Fig. 909).
2. Using a suitable tool (e.g. flat-blade screwdriver), press
lug between control unit (1 or 3) and protective cap (4)
towards control unit and pull off control unit axially.
3. With 1553 control unit, spread open holding clamp (2) to
side and pull off control unit towards front.
4. Carry out works on stripped down components (see
9.1.1).
9.2.7.2 Installation
1. Guide 1563/1564 control unit (3, Fig. 909) or 1553 con-
trol unit (1) with holding clamp (2) laterally into guide of
protective cap (4) and push in up to stop.
2. Insert connector on control unit.
9.2.8 Replacing burner head
9.2.8.1 Removal
NOTE
Before disconnecting the plug-in electrical connections or the
connections between the wiring harness and the measuring
and control sensors, the connector assignments should be
marked or noted.
1. Disconnect plug-in connections to measuring and control
sensors on heat exchanger and disconnect wiring har-
ness.
2. Disconnect fuel lines if necessary.
3. Loosen nuts (3, Fig. 910) until bolts can be swung away.
4. Swing away screws (1), pull out cotter pin (2) and
remove.
5. Remove burner head (4).
6. Carry out works on stripped down components (see
9.1.1).
9.2.8.2 Installation
1. Move burner head (4, Fig. 910) into mounting position,
swing in screws (1) and tighten nuts (3) by hand.
2. Mount cotter pin (2) in accordance with intended swing-
ing direction and secure.
3. Swing in bolts (1) and initially tighten hand-tight with
nuts (3) to prevent one-sided twisting.
4. Tighten nuts (3) to 5,0 + 1 Nm.
5. Connect fuel lines if necessary.
6. Make the electrical connections.
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