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classic HE - Installation & Servicing
SERVICING
70
GAS CONTROL VALVE REPLACEMENT
1. Refer to Frame 61.
2. Remove the burner and air box assembly. Refer to
Frame 54.
3. Remove the control box fixing screws.
Swing the control box down into the servicing position.
4. Disconnect the gas control valve electrical leads.
5. Undo the gas cock union .
6. Whilst supporting the gas control valve, remove the 2
screws retaining the manifold to the back panel.
7. Remove the gas control / manifold assembly.
8. Remove the 4 screws retaining the manifold to the gas
control valve, and fit the manifold to the new valve. Ensure
that the new control is fitted the correct way round (an arrow
engraved on back indicates the direction of flow).
9. Transfer the gas cock union to the new gas control valve,
using an approved jointing compound.
10.Reassemble in reverse order.
11. Check the operation of the boiler.
12.Refer to Frame 48, item 18 for gas adjustment sealing.
1. Refer to Frame 61.
2. Remove the burner and air box assembly. Refer to Frame 54.
3. Remove the electrode retaining nut.
4. Remove the pilot shield.
5. Remove the ignition electrode and integral lead.
6. Refit the new electrode and lead in reverse order.
Ensure that the pilot shield is replaced.
7. Check the spark gap. Refer to Frame 67.
8. Reassemble in reverse order.
9. Check the operation of the boiler.
68
IGNITION ELECTRODE AND LEAD REPLACEMENT
1. Refer to Frame 61.
2. Remove the screw retaining the front
burner support strap to the combustion
chamber.
3. Remove the M5 pozi screw, situated at the
left hand bottom rear of the burner. Pull
the burner downward to disengage the
retention tab and remove the burner.
4. At this stage the main burner injector can
be removed, checked, cleaned or
replaced as required. Ensure that a new
copper sealing washer is used.
5. Fit the new burner, ensuring that the
retention tab is correctly located in the air
box slot and reassemble in reverse order.
6. Check the burner for cross-lighting and
flame stability.
69
MAIN BURNER AND MAIN BURNER INJECTOR REPLACEMENT
SERVICING
201850-6.pmd 21/02/2008, 12:5838