Glow-worm sxi and Gas Valve - Manual (Page 32)

32 0020015347-03
12 Servicing
Diagram 12.4
HEAT
EXCHANGER NUT
(5 OFF)
ELECTRODE
LEAD
Diagram 12.5
GAS
SERVICE
COCK
GAS PIPE
12.3 Burner
NOTE: IF THE BURNER HAS TO BE REMOVED IT WILL
REQUIRE A NEW GASKET WHEN REFITTED.
Drop down the control panel into the service position, see
diagram 10.4.
Disconnect the gas supply at the gas service cock.
Remove the two gas pipe retaining clips, one located below gas
valve and the other one located on the underside of the boiler
chassis, see diagram 12.4.
Pull sealing grommet down gas pipe, see diagram 12.4.
Push the gas pipe upwards further into gas valve connection
and then rotate anti-clockwise (looking down) until the gas pipe
end is over the large hole in boiler chassis, see diagram 12.4.
Withdraw the gas pipe from gas valve connection and remove.
NOTE: When replacing ensure that the sealing grommet,
situated below the gas valve is correctly re-seated.
Disconnect the gas control valve plug at the gas control valve.
Disconnect the electrical leads from the fan.
Remove the five combustion chamber front retaining nuts, see
diagram 12.5.
Gently remove the fan, gas control valve and burner assembly
from the combustion chamber, see diagram 12.3.
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.
Inspect the sealing rings and replace if necessary.
Removal of the burner is not necessary during a normal service.
12.4 Combustion Chamber and Heat
Exchanger
Refer to diagram 12.3.
Remove loose debris from combustion chamber using a soft
brush and vacuum cleaner. Carefully flush by spraying water
any remaining debris through the condensate trap (Ensure the
water is kept away from electrical components).
GAS
VALVE
GAS PIPE
RETAINING CLIP
SEALING GROMMET
12402
GAS PIPE
RETAINING
CLIP
11480
SPADE
CONNECTOR
11531
Diagram 12.3
BURNER
COMBUSTION
CHAMBER
FAN
GAS
VALVE
SEALING
RING
12343