Glow-worm Ultrapower sxi - Manual (Page 34)

34
12 Servicing
13346
SILENCER
BRACKET
EARTH
LEAD
IGNITION
LEAD
HEAT
EXCHANGER
12.4 Burner
NOTE:
● The following procedure will require that you replace the
burner door seal and nyloc nuts.
● Removal of the burner is not necessary during a normal
service, but if it is removed it will require a new gasket, see
diagram 12.12.
● When replacing ensure that the sealing grommet, situated
below the gas valve is correctly re-seated.
Slacken the gas connection at the union nut between the
boiler module and tank module.
Remove the gas supply pipe securing clip and withdraw the
gas pipe from gas valve, see diagram 12.10.
Disconnect the electrical connection at the gas valve and
disconnect the electrical connection from the fan, see diagram
12.10.
Disconnect the ignition lead and earth lead from the burner
door, see diagram 12.9.
Disconnect the flue overheat thermostat, see diagram 12.11.
Remove the four burner door nyloc nuts, one of these also
holds the silencer bracket, see diagram 12.11.
Gently remove the fan, gas valve and burner assembly from
the combustion chamber, taking care not to trap the primary
return thermistor electrical cables.
Clean the burner with a soft brush taking great care not to
damage the front insulation. DO NOT use wire or sharp
instruments to clean the holes of the burner. Inspect the
burner for any signs of damage.
Remove and discard the burner door seal and replace with
new.
12.5 Heat Exchanger
Refer to diagram 12.11.
Remove loose debris from inside the heat exchanger using a
soft brush and vacuum cleaner.
Carefully flush by spraying water into the heat exchanger, any
remaining debris should pass through the condensate trap
(Ensure the water is kept away from electrical components).
ELECTRICAL
CONNECTION
GAS VALVE
FAN
ELECTRICAL
CONNECTION
GAS SUPPLY PIPE
SECURING CLIP
Diagram 12.10
13350
13373
NYLOC
NUT (4 OFF)
GAS VALVE
FAN
BURNER
DOOR
SILENCER
BRACKET
SEAL
HEAT EXCHANGER
FLUE
OVERHEAT THERMOSTAT
Diagram 12.11
Diagram 12.9