Spheros thermo 231, Workshop Manual

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9 Repair Thermo 230 / 231 / 300 / 301 / 350
90
6
9.2.4 Combustion Air Fan, Replacement
NOTE
For replacement of the combustion air fan the burner may
be left installed.
In removed condition ensure that igniter electrodes are
not bent and nozzle is not damaged.
9.2.4.1 Removal
1. Loosen screws (3, Fig. 902) and withdraw cap (2)
from burner.
2. Using suitable tool (e.g. mandrel 3 mm) open slide
lock (5) until fan wheel can be pulled off.
3. Disconnect electrical connector (9).
4. Remove screws (6) with lock washers and withdraw
fan motor (7).
5. Perform procedures on components after
disassembly (refer to 9.1.1).
9.2.4.2 Installation
NOTE
Fan motor (7, Fig. 902) to be aligned with control unit
(recess in mounting flange) and with clutch (by rotating
drive shaft).
1. Align fan motor (7) and position for installation.
2. Attach fan motor using screws (6) and lock washers.
3. Tighten screws with 5 Nm + 1 Nm.
4. Connect electrical connector (9).
5. Bring slide lock (5) on fan wheel in installation
position.
6. Slide fan wheel onto drive shaft and using suitable tool
(e.g. mandrel 3 mm or pliers) close slide lock until fan
wheel is locked.
7. Locate cap (2) and secure with screws (3).
8. Tighten screws with 2 Nm.
Closing slide lock Opening slide lock