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7.7 Removal and refitting fan wheel and fan motor
Removal
1. Put the fan housing cover in the servicing position
(see Ch. 7.6.)
2. Loosen the threaded pin ➀.
3. Remove the fan wheel.
4. Remove plugs No. 3 and No. 11.
5. Remove air pressure switch ➁.
6. Supporting the motor in place, remove screws ➂.
6. Remove the motor from the housing.
Refitting
Reassemble in the reverse order.
☞ Turn the fan wheel by hand to check freedom of
movement.
Removal and refitting fan wheel and fan motor
7.8 Removal and refitting servomotor and angle drive of air damper
Removal
1. Remove the plug ➀ from combustion manager.
2. Remove the screws ➁.
3. Remove crank-arm ➃ from the gas butterfly.
4. Remove servomotor ➂ and drive shaft ➃.
Air damper opens due to spring tension.
5. Remove screws to remove frame ➄.
6. Remove screws and remove angle drive ➅.
Refitting
Damage to the servomotor!
Do not turn the shaft of the servomotor, either
by hand or with a tool.
1. Mount angle drive ➅. The air damper must be fully open
(90°) (see Chap. 7.11)
2. Refit frame ➄ and tighten screws.
3. Refit crank-arm ➃ to servomotor.
4. Set indicator ➆ of the angle drive to “Closed position”
of the servomotor and hold in this position.
5. Place crank-arm into the groove of the indicator and
tighten servomotor.
6. Fix crank-arm to gas butterfly,
7. Fit plug ➀ to combustion manager.
Ensure correct alignment of crank-arm. The
crank-arm must be firmly connected to the gas
butterfly valve.
Removal and refitting servomotor and angle drive
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