Heat Exchanger - Glow-worm Ultrapower 100sxi Installation And Servicing

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).
34
12 Servicing
SILENCER
BRACKET
IGNITION
LEAD
GAS SUPPLY PIPE
SECURING CLIP
ELECTRICAL
CONNECTION
SEAL
BURNER
DOOR
HEAT
EXCHANGER
EARTH
LEAD
Diagram 12.9
ELECTRICAL
CONNECTION
GAS VALVE
Diagram 12.10
FLUE
OVERHEAT THERMOSTAT
HEAT EXCHANGER
NYLOC
NUT (4 OFF)
SILENCER
BRACKET
FAN
Diagram 12.11
GAS VALVE
FAN