Glow-worm Inset BBU50 - Manual (Page 21)

21 221723B
Diagram 8.8
8 Servicing
8.7 Flue Blockage Safety Device Assembly
Gain access as relevant part of Section 8.3. Remove any dust
and lint, inspect the pilot for damage. Remove the sensing tube
adapter, to clean, blow through, do not use a wire or sharp
instrument. If necessary replace the flue blockage safety device.
Check for the correct spark gap, see diagram 8.6.
To remove the safety device, remove the two securing screws,
see diagram 8.7.
8.8 Ignition Lead
Inspect the ignition lead for wear or damage, clean or replace
as necessary.
8.9 Electrode
Ensure the electrode is in line with the earth post and the spark
gap is as shown in diagram 8.6.
Inspect the electrode for wear or damage, clean, or replace the
flue blockage safety device, see diagram 8.7.
To remove the safety device, disconnect the pilot tube nut and
two securing screws, see diagram 8.7.
8.10 Thermocouple
Inspect the thermocouple for wear or damage, clean or replace
as necessary the flue blockage safety device, see diagram 8.7.
To remove the safety device see diagram 8.7.
Note: When reassembling the burner assembly the following
points should be observed:
a) Make sure that the lint arresters are engaged in the correct
position on the burner support bracket.
b) DO NOT replace the combustion chamber control/burner
assembly into the back boiler until the boiler flueways servicing
has been carried out.
8.11 Back Boiler Flueways
Undo the four screws securing the lower draught diverter plate,
see diagram 8.8 and remove.
Lift out the flue baffles, see diagram 8.9.
Place a sheet of paper in the base of the combustion chamber.
Clean the boiler flueways with a suitable stiff brush.
To make sure that the flueways are clean, view with the aid of
a mirror or reflector.
Remove the paper and debris.
When refitting make sure that the baffles are correctly orientated
and seated and are centred in the flueways see diagram 8.9.
NOTE: There is no baffle in the front flue way.
NOTE: If the heat exchanger has been turned the baffles must
still be fitted into the back and middle flue ways.
Refit the lower draught diverter plate using the four screws
previously removed.
NOTE: The draught diverter is stamped FRONT to aid fitting,
see diagram 8.8 for correct position.
Now refit the control/burner assembly.
8032
SECURING
SCREWS (4)
DRAUGHT
DIVERTER
LOWER DRAUGHT
DIVERTER PLATE
(Left hand water connection shown)
Diagram 8.9
7981
BAFFLES
HEAT
EXCHANGER
BACK
FLUEWAY
MIDDLE
FLUEWAY
(Left hand water connection shown)
(Baffles must be
positioned centrally
in the flueways)