Glow-worm Inset BBU50 - Manual (Page 26)

26 221723B
10 Replacement of Parts
Diagram 10.9
6226
GAS CONTROL PLUG
SECURING
SCREW SOLENOIDS
FIRE
FRONT
GAS
SERVICE
COCK
UNION
NUT
6682
Diagram 10.8
ELECTRICAL
CONNECTORS
OVER HEAT
CUTOFF DEVICE
LOCKNUT
CAPILLARY
CUT OUT
SLOT
SPLIT
GROMMET
SUPPORT
PLATE
Take care to make sure that the hook at the back of the lid hooks
onto the control box before fitting the securing screw.
The capillary tube must not touch any part of the back boiler that
becomes hot, re-clip the capillary tube and push the phial into
the pocket.
NOTE: When fitting the phial use heat sink compound.
When refitting refer to diagram 5.4.
10.9 Lockout Reset Button
Remove the control box lid, see diagram 10.3.
Remove the lockout reset button electrical plug from the control
board, release the tabs to remove the lockout reset button, see
diagram 10.6.
NOTE: Turn the electrical plug and carefully ease through the
hole in the front of the control box as shown in diagram 10.6.
When refitting refer to the wiring diagram 5.6.
10.10 Control Board (PCB)
Remove the control box lid, see diagram 10.3.
Refer to diagram 10.7.
Disconnect the ignition lead.
Disconnect the electrical connections from the control thermostat.
Disconnect the four electrical plugs.
Disconnect the earth lead.
Release the wires from the mains terminal strip.
Carefully pull the board from its supports.
When refitting refer to the wiring diagram 5.6.
10.11 Over Heat Cut-off Device (Sealed
systems only)
Remove the over heat phial and unclip the capillary tube, see
diagram 5.4.
Remove the control box lid, see diagram 10.3.
Remove the locknut, see diagram 10.8.
Remove the over heat electrical connections, see diagram
10.8.
Remove the over heat cutoff device and capillary from the cut
out slot, see diagram 10.8.
NOTE: When refitting, the capillary should pass through the cut
out slot on the control box, see diagram 10.8.
When refitting refer to the wiring diagram 5.6.
Take care make sure that the hook at the back of the control box
lid hooks into the slot on the control box before refitting the
securing screw.
The capillary tube must not touch any part of the back boiler that
becomes hot, re-clip the capillary tube and push the phial into
either pocket on the 22mm copper pipe.
10.12 Solenoids
Refer to diagram 10.9.
Remove the fire front gas service cock.
Remove the support plate.
Remove the gas control plug at the gas control valve.
Remove the solenoid securing screw.
Remove the solenoids.