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Minimiser
- Installation
30
SERVICING
53 FAN REMOVAL AND CLEANING
SER
VICING
55 CLEANING THE HEAT
EXCHANGER
54 BURNER REMOVAL AND CLEANING
1.
Disconnect the 2 ignition leads and one detection lead from
the electrodes.
2.
Disconnect the pressure sensing pipe from the burner. Pull
the pipe downward to disengage it from the burner
mounting plate.
3.
Undo the 3 fixing screws securing the burner assembly.
4.
Withdraw the burner assembly downward and out of the
heat exchanger.
5.
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.
6.
Inspect the spark and detection electrodes. Ensure they
are clean and in good condition - replace if necessary.
7.
Check the spark and electrode gaps are correct.
8.
Check that the spark and detection leads are in good
condition and renew as necessary
Detection electrode
Dimensions in mm.
(a)
3
Spark
electrodes
Manifold
block
1.
Disconnect the electrical leads from the fan.
2.
Disconnect the pressure sensing pipe from the fan.
a.
Undo the 2 screws securing the pipe to the fan.
b.
Undo the 2 screws securing the pipe clamping plate to the
manifold block.
c.
Withdraw the clamping plate.
d.
Withdraw the pipe from the boiler.
3.
Press the retaining bracket lever upwards and rotate the fan
body to the right to disengage the fan scroll from the bracket.
Continue rotating to disengage the bayonet fixing on the fan
outlet.
4.
Withdraw the fan.
5.
Check that the fan impeller runs freely. Clean with a soft
brush or renew as necessary - refer to Frame 70.
Note.
Always take care when handling the fan, in order to
preserve the balance of the impeller.
3
(d)
Fan pressure
sensing pipe
Gasket
Burner pressure sensing pipe
(b)
Clamping
plate
(c)
1.
Place a plastic sheet or similar beneath the boiler
and remove all visible loose deposits from the
heat exchanger fins, using a suitable brush.
2.
Take care to clean debris from the ledge inside
the combustion chamber.
IMPORTANT
. Deposits are most effectively removed
from the fins if they are dry. Ensure this by running
the pre-service checks with the boiler thermostat set
to maximum to avoid condensing conditions.