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36 SERVICING - continued
Remove lower top panel from the boiler casing.
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 CXC 48 & 70 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 damage the leads.
The burners may be lifted out after they have been
pushed back to clear the injector. 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.
Hinge cleanout cover insulation upwards and to the
left. Remove front access cover (secondary heat
exchanger) insulation by releasing from the retention
tabs.
Unscrew the 5 screws securing the fan assembly and
remove the pressure sensing pipe. Unclip the
capacitor, disconnect the inline connector and remove
the earth lead. Remove the assembly by pivoting it
anticlockwise.
Remove the fan plate, inspect the fan impeller and
clean if necessary.
Concord CXC 48/70
Undo the screws securing the cleanout cover and lift
it off to give access to the flue ways. Lift out the flue
baffles.
Concord CXC 94/116
Undo the screws securing the clean out cover and lift it
off.
Remove the 2 screws securing the distribution plate. Lift
the front edge of the baffle and pull forward to clear the
joggle at the rear.
Lift the RH edge up into the corner until the LH edge
drops below the supporting angle - see diagram.
The baffle can now be removed and access to the flue
ways obtained.
26
SERVICING
Lift out the flue baffles.
All boilers
Remove all loose deposits from the primary
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.
In particular, check that:
1. The ignition electrode shield and base fixing
2. The electrodes are correctly positioned -
screws are tight.
see Frames 40 or 41.
Concord CXC -
Installation
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