45
Installation and Servicing
SECTION 3 - SERVICING
SER
VICING
3.9 REPLACEMENT OF COMPONENTS
GENERAL
When replacing ANY component
1.
Isolate the electricity supply.
2.
Turn off the gas supply.
3.
Remove the boiler front panel. Refer to Section 3.2.
4.
Swing the control box down into its servicing position.
After replacing ANY component check operation of the boiler,
including gas soundness, gas rate and combustion test.
IMPORTANT.
Ensure all gas valve connections are gas tight with a gas
soundness check up to the gas control valve.
When work is complete, the front panel must be correctly
refitted - ensuring that a good seal is made.
Notes.
1.
In order to assist fault finding, the control panel has
an LCD diagnostic display.
The key to boiler fault
conditions is shown in Section 4
.
2.
In order to replace components in Sections 3.23-3.33 it
is necessary to drain the boiler. Refer to Section 3.22.
THE BOILER MUST NOT BE OPERATED WITHOUT THE FRONT PANEL FITTED
3.10 FAN REPLACEMENT
1.
Refer to Section 3.9.
2.
Disconnect the electrical leads from
the fan.
3.
Remove the clip from the gas control
valve outlet.
4.
Remove the extended nut retaining
the fan mounting bracket.
5.
Lift and remove the fan and venturi
assembly.
6.
Remove the screw and twist venturi
anti-clockwise to remove venturi
assembly,
noting the orientation of
the venturi in relation to the fan body.
7.
Transfer the venturi assembly to
the new fan, replacing the ‘o’ ring if
evidence of damage or deterioration
is visible.
8.
Fit the new fan / venturi assembly
ensuring the retaining tabs are
correctly positioned and the fan
outlet sealing gasket is correctly
positioned and free from damage.
Refit the extended nut.
9.
Reassemble the boiler in reverse
order, taking care not to overtighten
the screw on the fan mounting
bracket and ensure all gas ‘o’ rings
are in place
10.
Check that the boiler operates in
both DHW and CH Modes.
2
4
6
8
Retaining Tabs
3
