British Gas RD1
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Installation & Servicing
33
SERVICING
61 AIR PRESSURE SWITCH (APS) REPLACEMENT
1. Refer to Frame 51
2. Remove the 2 silicon rubber tubes from the fan sensing points.
3. Disconnect all the fan leads.
4. Remove the M4 screw securing the thermistor and remove from the
fan.
5a. Rear flue. Slacken the M4 screw securing the flue connector to the
fan. Disconnect the connector from the fan and slide into the flue.
5b. 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.
6. Disconnect the silicon rubber tube from the rear of the collector hood.
7. Slacken the two M5 nuts on the front tie rods, releasing the tie rods
from the combustion chamber.
8. Remove the M5 central fixing screw at the rear of the collector hood
and remove collector hood / fan assembly.
9. Remove the three M4 screws retaining the fan to the collector hood.
10. Fit the new fan and reassemble in reverse order, ensuring the fan leads,
and 3 sensing tubes are reconnected.
60 FAN REPLACEMENT
11. Check the operation of the boiler.
3. Disconnect the detection lead from the PCB.
4. Unplug all the Molex connectors from the PCB.
5. Disengage the PCB from the mounting posts and withdraw
from the control box.
6. Fit the new PCB and reassemble in reverse order.
7. Check the operation of the boiler.
Fuse.
To change the fuse, prise the top off the holder and
disengage the fuse. Refer to Frame 32 for fuse location.
1. Refer to Frame 51.
2. Remove the APS fixing screw.
3. Remove both sensing tubes from the APS.
4. Remove the 3 electrical connections from the
APS.
5. Fit the new APS and reassemble in reverse order.
6. Check the operation of the boiler.
62 PRINTED CIRCUIT BOARD (PCB) REPLACEMENT
IMPORTANT.
Any failure indicating a PCB fault should be confirmed before
replacing the PCB by ensuring that all electrical plug connections
are correctly made (check pin alignment) and secure.
Note.
Refer to Frame 68 of 'Exploded Views' for
illustration of the procedure detailed below.
1. Refer to Frame 51.
2. Remove the fixing screws and swing the control box down
into the servicing position.
59 COMBUSTION CHAMBER INSULATION REPLACEMENT
1. Refer to Frame 51.
2. Remove the burner and air box assembly and
igniter. Refer to Frame 46.
3. Remove the 4 tie rods.
4. Remove the combustion chamber.
5. Remove the 2 side panel retaining brackets.
6. Remove the side insulation panels.
7. Remove the front and rear insulation panels.
8. Fit the new front and rear
insulation panels.
9. Fit the new side panels
ensuring the cut out is on the
correct side and retain with
the brackets and screws
previously removed.
10. Reassemble in reverse order.
11. Check the operation of the
boiler.
SER
VICING
