Main Mitre-AS, Installation And Service Instructions Manual

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Fig. 6
Page 7
Remove the complete pilot and sensing device assembly see section 3 .
Release two union nuts and washers 20. Fig. 5 . DO NOT lose sealing washers.
Release screw 21. Fig. 5 at front of flue deflector and remove retaining strip. Carefully pull
heating unit forwards out of the appliance. Brush or wash clean if necessary. If de-scaling is
necessary use a proprietary brand of de-scaling or a solution of 10 parts water to one part
hydrochloric acid. The water should preferably be hot. Add ACID to WATER not water to acid.
Fill heating body with solution and leave until solution stops bubbling. Flush thoroughly before
re-fitting.
Re-assemble in reverse order ensure sealing washers are fitted, and that the thermocouple
leads are routed away from hot surfaces.
WARNING