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Fig.43
Flue adaptor test points
1
9.2
Standard inspection and maintenance operations
Fig.44
Remove the condensate trap
2
PN-0000363
PN-0000381
Remove the plug from the combustion test point, insert the analyser probe
and obtain the CO/CO
ratio. This must be less than 0.004. If the
2
combustion reading (CO/CO
the complete flue system and combustion circuit seals has been verified,
and the inlet gas pressure and gas rate are satisfactory either:-
Perform the "Standard Inspection and Maintenance" .
Perform "Setting the Gas Valve" .
Replace and set the gas valve.
1
Combustion test point
2
Incoming air for combustion test point
Warning
Ensure that both flue test point plugs are in place after checking
combustion.
9.2.1
Annual Servicing
Warning
Ensure that the boiler is cool. Ensure that both the gas and
electrical supplies to the boiler are isolated.
Caution
Always examine any seals or gaskets, replacing where necessary.
Where a seal or gasket is supplied with a spare part it should be
used, irrespective of the condition of the original. Use only original
spare parts that are intended for use with this type of boiler.
Important
When performing any inspection or maintenance, personal
protective equipment must be used where appropriate.
1. Ensure that both the gas and electrical supplies to the boiler are
isolated and that the boiler is cool.
2. Remove the case front panel and hinge down the control panel.
See
Specific maintenance instructions, page 51
3. Disconnect the pipe from the top of the condensate trap and the drain
pipe from the condensate drain pipe connection. Undo the screw
securing the bracket and trap to the boiler lower panel.
4. Remove the trap. Take care not to spill any residual condensate on
the controls and P.C.B. Thoroughly rinse the trap and examine the
gasket on the trap base, replacing if necessary.
5. Remove the clip securing the gas feed pipe to the air/gas venturi on
the fan. Disconnect the pipe. Do not break the joint between the pipe
ang gas valve unless necessary.
6. Disconnect the electrode lead and the fan electrical plug.
7. Undo the four nuts retaining the burner / door assembly to the heat
exchanger.
8. Carefully draw the burner / door assembly forward and remove.
See
Checking the burner and cleaning the heat exchanger, page 50
9. Clean any debris from the heat exchanger and check that the gaps
between the tubes are clear.
10. Inspect the burner, insulation and position and condition of the
electrode, cleaning or replacing if necessary. Clean any dirt or dust
from the airbox.
ratio) is greater than this, and the integrity of
2
9 Maintenance
49
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