British Gas RD1
-
Installation & Servicing
31
SERVICING
Refer to Frame 51.
A. Remove the fixing screws.
B. Swing the control box down into the servicing
position.
Control potentiometer
1. Pull the knob off the shaft.
2. Remove the backnut securing the control
potentiometer to the control box.
3. Unplug the Molex connector from the printed
circuit board.
4. Replace and reassemble in reverse order.
Thermistor sensor lead assembly
5. Unplug the sensor Molex connector from the
printed circuit board and withdraw through the
rear of the control box.
6. Remove the 2 sensors from the heat exchanger.
7. Remove the thermistor from the fan.
8. Unclip the harness from the back panel.
9. Remove the bush in bottom of the back panel
and pass the sensors through the hole .
10. Replace and reassemble in reverse order.
Reset switch
11. Disconnect the electrical leads from the rear of
the switch.
12. Press in the 2 side retaining clips and remove
the switch.
13. Replace and reassemble in reverse order.
14. Check the operation of the boiler.
54 CONTROL POTENTIOMETER, THERMISTOR SENSOR LEADS and RESET SWITCH
REPLACEMENT
55 PILOT BURNER REPLACEMENT
1. Refer to Frame 51.
2. Remove the burner and air box assembly.
Refer to Frame 46.
3. Remove the electrode retaining nut and remove the pilot
shield and electrode.
4. Unscrew the central pilot fixing screw and lift the pilot
clear of the pilot injector. The pilot injector may now be
unscrewed if required.
5. Replace the pilot burner (injector if necessary) and retain
with the M4 screw previously removed. Ensure that the
copper sealing washer is replaced when refitting the pilot
injector.
6. Replace the electrode and pilot shield, retaining both with
the electrode nut. Check the gap.
7. Reassemble in reverse order.
8. Check the operation of the boiler.
9. The pilot is factory set to maximum and no further
adjustment is possible. Ensure that there is an inlet
pressure of 20 mbar available.
SER
VICING
