Glow-worm Ultracom sxi - Manual (Page 52)

52
15 Replacement of Parts
15.1 General
IMPORTANT: The replacement parts described in sections
15.5 to 15.9 and section 15.12, will require the removal of the
burner module assembly and the replacement of the burner
door seal and self locking nuts.
Replacement parts that have associated components that
need replacing on removal, i.e. ‘O’ ring, seals, gasket, etc.,
will be supplied and should be fitted.
Replacement of parts must be carried out by a
competent
person approved at the time by the Health and Safety
Executive.
Before replacing any parts of the boiler it should be isolated
from the mains electric supply and the gas should be turned
off at the gas service isolation valve on the boiler, see
diagram 12.1.
Unless stated otherwise parts are replaced in the reverse
order to removal.
After replacing any parts always test for gas tightness and if
necessary carry out functional test of the controls.
Boiler Access
For replacement of parts the front casing and the inner casing
panel of the boiler will need to be removed. To remove undo
the two screws on the underside of the front casing and lift off.
Undo the two screws on the front of the inner front panel and
lift off.
The side panels can be hinged sideways and removed to aid
replacement of parts.
To hinge a side panel undo and remove the three screws
securing each side panel to the boiler, two at the front and
one at the top.
Draining of Boiler Heating Circuit
Drain down the Heating Circuit of the boiler only, by closing
the heating flow and return isolating valves, see diagram 12.2.
Attach a length of hose to the drain point and open the drain
valve, see diagram 12.1.
After servicing or replacing parts, close the drain valve and
remove the hose. Open the heating flow and return isolating
valves and refill, vent and pressurise the heating circuit. See
section 12.1.
Check for leaks.
15.2 Spark Electrode
For access, refer to section 15.1.
Refer to section 13.2 for removal.
15.3 Igniter Unit
For access, refer to section 15.1.
Remove ignition lead and electrical connections then remove
igniter unit by removing two securing screws, see diagram
15.1.
15.4 Ignition Lead
For access, refer to section 15.1.
Pull the spark plug style connector off the spark electrode,
refer to diagram 13.5 and the spade connector connected to
the igniter unit, see diagram 15.1.
Diagram 15.1
13274