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56 FAN REMOVAL AND CLEANING
1. Undo the fan inlet venturi top securing screw.
2. Slacken the other 2 securing screws.
3. Slide the venturi upward to disengage the sensing
pipe from the gas manifold.
4. Withdraw the venturi, complete with sensing pipe,
from the boiler.
5. Depress the retaining clip and rotate the fan to the
right to disengage the bayonet fixing on the fan
outlet.
6. Draw the fan forward and unplug the electrical lead
from the motor.
7. Withdraw the fan from the boiler.
Check that the fan impeller runs freely. Clean with a
soft brush and renew as necessary.
Note. Always take care when handling the fan, in
order to preserve the balance of the impeller.
57 BURNER REMOVAL AND CLEANING
1. Disconnect the ignition and detection leads from the
electrodes.
2. Undo the 3 fixing screws securing the burner assembly.
Withdraw the burner assembly downward and out of the
heat exchanger.
3. Brush off any deposits that may have collected on the
burner, ensuring that the flame ports are unobstructed.
Note. Brushes with metallic bristles must NOT be used.
40
SERVICING
Legend
A
Venturi
4.
Inspect the spark and detection electrodes. Ensure that
they are clean and in good condition - replace if
necessary.
5.
Check that the spark and electrode gaps are correct.
6.
Check that the spark and detection leads are in good
condition ,and renew as necessary.
B
Sensing pipe
Systemiser SE -
Installation
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