Potterton NXR5i Installation And Service Manual page 21

Step 3:
Remove the baffle plates from the upper flue ways.
Carefully sweep the flue ways with the brush supplied for that
purpose.
Brush the baffle plates as well.
If possible, use a vacuum cleaner.
Step 5:
Unfasten the nuts up to the stop.
Push in the handles of the sweeping covers.
Remove the sweeping covers.
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NXR5i
Step 4:
Remove the left and right-hand casing covers.
Remove the top insulating material.
Step 6:
Brush the vertical plates.
Put back the sweeping covers, insulating material and casing
covers by reversing the procedure above.
chemical sweeping is recommended for such boilers.
See chapter "Chemical sweeping".
Put the baffle plates back in place. Interlock them with each
other while fitting them into the flue ways.
Close the upper sweeping doors.
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