Navien NCB300-28K, Руководство по установке и эксплуатации

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64 Maintaining the Boiler
10. Remove the rubber packing at the top of the cover and put
a Phillips screwdriver into the hole, and then loosen the
middle bolt located at the back of the burner.
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11. Remove the ten bolts connecting the mixing chamber and
the heat exchanger, and then remove the mixing chamber,
burner and the chamber bracket.
8. Remove the screw connecting the fan motor assembly
and the mixing chamber, and then remove the fan motor
assembly.
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9. Remove the four bolts securing the chamber brackets.