Glow-worm BBU 45/4 - Manual (Page 29)

29 2000225023C
10 Replacement of Parts
10.6 Gas Valve
Refer to the relevant parts of Section 8.4 to remove the controls
assembly.
Refer to diagram 10.2.
Remove securing screw and disconnect electrical plug, see
diagram 10.2.
Disconnect the pilot tubing nut at the gas valve.
Undo the securing screws to separate the valve from the supply
pipe flange and gas manifold.
Fit the new “O” ring seals supplied with the new gas control
valve.
10.7 Burner
Follow the relevant instructions in Section 8.4 and 8.5 to remove
the burner.
Transfer the flue blockage safety device to the new burner, see
diagram 10.1.
10.8 Control Thermistor
Remove the control thermistor phial, see diagram 5.4.
Remove the electrical control box lid securing screws and lift the
lid off, see diagram 10.3.
Disengage the electrical connection from the P.C.B., see diagram
10.4.
Note: When fitting the new control thermistor, make sure that
the thermistor lead is placed through the appropriate slot in the
right hand side of the control box.
Refit the electrical connections.
Refit the control box cover.
Make sure the cable does not touch any part of the back boiler.
10.9 Control Board (PCB)
Remove the control box cover and control box lid, see diagram
10.3.
Refer to diagram 10.4.
Disconnect the ignition lead.
Disconnect the sensing lead.
Disconnect the four electrical leads
Note: To remove the boiler user control plug and the thermistor
plug, prise locking tab before attempting to remove plug.
Disconnect the earth lead.
Remove control board (PCB) securing screw.
Withdraw control board (PCB).
When refitting refer to the wiring diagram 5.8.
Diagram 10.4
9603
IGNITION
LEAD
ELECTRICAL
PLUG
THERMISTOR
PLUG
CONTROL
BOARD
(PCB)
BOILER
USER
CONTROL
PLUG
SENSING
LEAD
GAS
VALVE
PLUG
SECURING
SCREW
EARTH
LEAD