Glow-worm Flexicom cx - Manual (Page 40)

0020107232_03 - 12/14 - Glow-worm
MAINTENANCE
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Diagram 14 .1
13931
Diagram 14.2
15584
14 Replacement of Parts
14.1 General
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
14.1.
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 of the boiler will
need to be removed. To remove undo the two screws on the
underside of the front casing and lift off.
If the appliance site situation has sufficient side clearances
the side panels can be hinged sideways and removed to aid
replacement of parts.
To hinge a side panel undo and remove the four screws
securing each side panel to the boiler, two below and two 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 on the wall mounting
jig. Attach a length of hose to the drain point and open the drain
valve, see diagram 14.1.
After 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, refer to section 11.
Check for leaks.
Draining of Boiler Hot Water Circuit
Drain the Domestic Hot Water circuit by closing the cold-water
isolation valve on the wall mounting jig, see diagram 14.1.
Open one or more hot water taps to drain the hot water circuit.
After replacing parts open the cold-water isolation valve and
slowly open a hot water tap to remove air. Close the hot water
tap and check for any leaks.
14.2 Igniter Unit
For access, refer to section 14.1.
Remove ignition lead and electrical connections then remove
igniter unit by removing two securing screws, see diagram 12.9.
14.3 Ignition Lead
For access, refer to section 15.1.
Pull the spark plug style connector off the spark electrode and
the spade connector connected to the igniter unit, see diagram
12.6.