21
SECTION 3 - SERVICING
3.8 REPLACEMENT OF COMPONENTS
GENERAL
When replacing ANY component
1.
Isolate the electricity supply.
2.
Turn off the gas supply.
3.
Remove the lower front panel fixing screws, swing the panel
into the servicing position and remove the upper front panel.
Refer to Section 3.2.
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 panels must be correctly
refitted - ensuring that a good seal is made.
Notes.
1.
In order to assist fault finding, the control panel has an
LED diagnostic display.
2.
In order to replace components in Sections 3.20-3.32 it
is necessary to drain the boiler. Refer to Section 3.19.
THE BOILER MUST NOT BE OPERATED WITHOUT THE FRONT PANEL FITTED
3.9 FAN REPLACEMENT
1.
Refer to Section 3.8.
2.
Disconnect the electrical leads from the fan.
3.
Remove the clip from the gas control valve and
the gas pipe.
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 the operation of the boiler.
2
4
6
8
Retaining Tabs
3
