British Gas RD1
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Installation & Servicing
29
SERVICING
49 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 thermistor.
5. Refit the air box assembly and burner. Ensure that the
burner front fixing is refitted.
6. Reconnect the gas supply and the electrical wiring.
7. Check the sightglass in the boiler casing. Clean or renew
as necessary. Refer to Frame 52.
8. Check for gas soundness. Check the gas service cock
and pressure test point.
9. Refit the boiler casing (Refer to Frame 40). Note that it is
not necessary to disturb the controls casing pod.
10. Close the controls door.
1. Remove the 2 silicon rubber tubes from the fan sensing points.
2. Disconnect all the fan leads.
3. Undo the M4 thermistor securing screw and remove thermistor
from the fan.
4a. Rear flue
Slacken the M4 screw securing the flue connector to the fan.
Disconnect the connector from the fan and slide into the flue.
4b. Side or top 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.
5. Disconnect the silicon rubber tube from the rear of the collector
hood.
6. Slacken the two M5 nuts on the front tie rods, releasing the tie
rods from the combustion chamber.
7. Remove the M5 central fixing screw at the rear of the collector
hood and remove collector hood/fan assembly.
8. Check that the fan impeller runs freely. Remove any debris
from the impeller with a soft brush.
9. Remove the flue baffles.
10. Remove all loose deposits from the heat exchanger,
particularly between the fins, using a suitable brush.
47 CLEANING THE FAN ASSEMBLY / THE FLUEWAYS
48 CLEANING THE BURNER, IGNITER 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 detection electrode. Ensure
that they are clean and in good condition.
5. Inspect the hot surface igniter and ensure it is in good
condition.
Check that:
a. The pilot burner injector is not blocked or damaged.
Refer to Frame 55 for removal details.
b. The pilot burner is clean and unobstructed.
c. The detection electrode is clean and undamaged.
d. The detection lead is in good condition.
e. The electrode gap is correct (Frame 55). Clean or renew
as necessary.
Note.
The pilot shield is located around the pilot assembly
bracket and is secured by the electrode retaining nut.
SER
VICING
