Replacing Burner Unit And Glow Plug - Webasto Thermo Pro 90 Workshop Manual

Thermo Pro 90
9.8

Replacing burner unit and glow plug

Removal
1. Remove heater (see Section 8.5.1), depending on space
required.
2. Remove combustion air fan (see Section 9.7).
3. Remove screw (3, Fig. 904).
4. Pull grommet (7) and burner unit (1) out of burner head
(2).
5. Loosen screw (6) with hold-down device (5) for glow
plug (4) and remove.
6. Pull glow plug (4) out of burner unit (1).
7. Carry out visual inspection for evaluation of burner unit
(see Section 5.3).
8. Carry out measures on components when dismantled
(see Section 9.2).
Alternative:
1. Disconnect electrical connections (see Section 9.3).
2. Unlock control unit and pull off of combustion air fan
cap.
3. Remove fastening screw of V-clamp (9, Fig. 904) and
pull off V-clamp.
4. Pull combustion air fan (4, Fig. 903) with burner head
(2, Fig. 904) out of heat exchanger (8, Fig. 904) and
remove.
5. Remove combustion air fan (see Section 9.7).
Continue as described above from Point 3.
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9 Maintaining and Replacing Components
Installation
1. Carefully insert glow plug (4) in burner unit (1) as far as
possible and fasten hold-down device for glow plug
with screw. Tighten screw to 2.5 Nm ± 10%.
2. Insert burner unit (1) and grommet (7) in burner head
(2).
3. Secure burner unit (1) with screw (3). Tighten screw to
3 Nm ± 10%.
4. Mount combustion air fan (see Section 9.7).
5. Connect electrical connections (see Section 9.3).
6. Install heater (see Section 8.5.2) if previously removed.
Alternative:
1. Continue as described above up to Point 4.
2. Mount combustion air fan (see Section 9.7).
3. Guide combustion air fan (4, Fig. 903) with burner head
(2, Fig. 904) into heat exchanger (8, Fig. 904), align if
necessary and fasten with V-clamp (9, Fig. 904).
4. Mount control unit and connect electrical connections
(see Section 9.3).
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