27
SERVICING
Classic
Slimline FF
-
Installation & Servicing
9.
Remove all loose deposits from the heat exchanger,
particularly between the fins, using a suitable brush.
10.
Reassemble in reverse order, ensuring the fan leads and 3
sensing tubes are reconnected.
1.
Remove the 2 silicon rubber tubes from the fan sensing
points.
2.
Disconnect the fan leads.
3a. Rear flue
Slacken the M4 screw securing the flue connector to the
fan. Disconnect the connector from the fan and slide into
the flue.
3b. Side flue
Slacken off two M4 screws securing the flue elbow and
flue connector. Disconnect the flue connector from the
elbow and slide into the flue. Remove the flue elbow.
4.
Disconnect the silicon rubber tube from the rear of the
collector hood.
5.
Slacken the two M5 nuts on the front tie rods, releasing
the tie rods from the combustion chamber.
6.
Remove the M5 central fixing screw at the rear of the
collector hood and remove collector hood/fan assembly.
7.
Check that the fan impeller runs freely. Remove any
debris from the impeller with a soft brush.
8.
Remove the flue baffles.
52 CLEANING THE FAN ASSEMBLY / THE FLUEWAYS
53 CLEANING THE BURNER AND PILOT ASSEMBLY
1.
Brush off any deposits that may have fallen on to the
burner head (ensuring the flame ports are unobstructed)
and remove any debris that may have collected.
Note.
Brushes with metallic bristles must not be used.
2.
Remove the main burner injector and ensure there is no
blockage or damage. Clean or renew as necessary.
3.
Refit the injector, using an approved jointing compound
sparingly.
4.
Inspect the pilot burner and ignition / detection electrode.
Ensure that they are clean and in good condition.
Check that:
a.
The pilot burner injector is not blocked or damaged. Refer to
Frame 59 for removal details.
b.
The pilot burner is clean and unobstructed.
c.
The ignition / detection electrode is clean and undamaged.
d.
The ignition / detection lead is in good condition.
e.
The spark gap is correct (Frame 59). Clean or renew as
necessary.
Note.
The pilot shield is located around the pilot assembly
bracket and is located by the electrode retaining nut.
54 RE-ASSEMBLY
Reassemble the boiler in the following order.
1.
Refit the flue baffles.
2.
Inspect the collector hood rope gasket and replace, if
necessary, ensuring that the self adhesive rope is fitted
centrally on to the lip of the collector hood / fan assembly.
The boiler efficiency will be adversely affected if incorrectly
fitted. Refit the collector hood and retain with the 2 front tie
rods and the rear central fixing screw. Tighten the nuts and
screw. Ensure that the sealing gasket is compressed. Refit
the pressure pipe.
3.
Refit the positive pressure tubes on the top of the fan
housing. Reconnect the electrical leads.
4.
Refit the air box assembly and burner. Ensure that the
burner front fixing is refitted.
5.
Reconnect the gas supply and the electrical wiring. Refer to
Frames 34 & 36.
6.
Check the sightglass in the boiler casing. Clean or renew as
necessary. Refer to Frame 55.
7.
Check for gas soundness. Check the gas service cock and
pressure test point.
8.
Refit the boiler casing (Refer to Frame 43, item 4). Note that
it is not necessary to disturb the controls casing pod.
9.
Close the controls pod door.
SER
VICING
