25
Concord CXSD/H -
Installation & Servicing
SERVICING
36 SERVICING - continued
Unscrew the extended nuts at the top of the NOx duct behind
the control box and lift the NOx duct clear of the burners, as
illustrated below.
Undo the wing nuts securing the burner front plate. Pull the
front plate forwards, at the top, and lift it out,
taking care not to
damage the insulation or the detection electrode
.
On the
CXSD 40/H, 50/H & 60/H
remove the screws holding
the HT heat shield from the LH leg of the combustion
chamber. Raise slightly and withdraw the heat shield,
taking
care not to damage the leads.
The burners may be lifted out after they have been pushed
back to clear the injectors. Take care not to damage the
ignition electrode assembly and carefully detach the ignition
leads when removing the left hand burner. Take care not to
damage the detection electrode when removing the RH
burner.
GENERAL
WARNING
ALWAYS turn OFF the gas supply at the gas inlet
cock and DISCONNECT the electricity supply
BEFORE WORKING on the APPLIANCE.
To facilitate the replacement of components, remove
and replace the lower front panel, NOx duct and the
burner front plate as necessary - described under
‘Servicing’.
In particular, check that:
1.
The ignition electrode shield and base fixing screws are
tight.
2.
The electrodes are correctly positioned. Refer to
Frames 40 or 41.
3.
Reassemble in reverse order. Refit the cleanout cover,
NOx duct, and casing panels.
(CXSD 120/H boiler only)
Refit collector hood baffles within collector hood using
M5 securing screws.
TESTING AFTER SERVICING
After re-assembly, restore the electricity and gas supplies.
Light the boiler. Refer to the Lighting Instructions and also
Frame 19 ‘Testing for Gas Soundness’ .
Check burner manifold pressures (Frame 22) and adjust if
necessary (Frames 23 or 24).
Finally, reset any external controls to the desired position.
Undo the screws securing the cleanout cover and
lift it off to give access to the flueways.
(CXSD 120/H boiler only)
Remove four M5 securing screws retaining
internal turning baffles from side of collector hood.
Slide turning baffles to rear of collector hood void
to facilitate access to flue ways for cleaning.
Remove all loose deposits from the heat
exchanger (especially from between the fins),
using the brush provided, and remove all debris
from the combustion chamber floor.
Examine the burner assembly. Clean the burner
bars by brushing them down with a stiff bristle (not
wire) brush. Check each bar carefully to ensure
that all flame ports are clear, that there are no
cracks and that all surfaces are free from
accumulated deposits.
If available, an industrial vacuum cleaner may be
useful to assist in this work. When cleaning the
burner bars, take care to avoid damage from
rough handling to the ignition or detection
electrodes.
Inspect the ignition and detection electrodes.
Ensure that they are clean and in good condition.
37 REPLACEMENT OF COMPONENTS - Refer to Frame 5
SER
VICING
Summary of Contents for Concord CXSD 40/H
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