A.O. Smith COF 199, Инструкция по установке, эксплуатации и обслуживанию

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2.9 Descaling
Calcium deposition depends on the type of water and the
demand. In addition, calcium deposition increases at high
water temperatures. A temperature setting of 60°C is
recommended, which will keep calcium deposition to a
minimum.
Access covers are located on the right and left sides for
inspecting and descaling the tank. The access covers
can be reached via the covering plates on the outer
jacket.
Empty the heater before opening the access covers.
Descaling must be carried out with a suitable substance.
Consult the supplier or installer.
2.10 Condensation
When the heater is filled with cold water or the hot-water
consumption is very high, the flue-gases will condense
on the cold surfaces of the combustion chamber and the
flue-gas discharge pipes. The drops of water will fall on
the burner and cause a hissing sound. This is normal and
will stop as soon as the operating temperature has been
reached.
2.11 Spare parts
It is important to mention the heater, type, model and full
serial number when ordering spare parts. The spare parts
can be determined according to these numbers.