Water-Side Maintenance - A.O. Smith GWV - 120 Installation And Service Manual

s
15.3 Water-side mainte-
nance
15.3.1
15.3.2
15.3.3
Instruction manual GWV
Introduction
The following steps must be carried out on the water side:
1. Checking the anodes
2. Descaling and cleaning the storage tank
Checking the anodes
Timely replacement of the anodes extends the service life of the appliance. The
appliance's anodes must be replaced as soon as they are 60% used or more
(take this into consideration when determining the maintenance frequency).
1. Loosen the anodes using suitable tools.
2. Check the anodes, and if necessary, replace them.
Descaling and cleaning the storage tank
Scale and lime buildup prevent effective conduction of the heat to the water.
Periodic cleaning and descaling prevents buildup of these deposits. This
increases the service life of the appliance, and also improves the heating
process.
Take the rate of scale formation into account when deciding on maintenance
frequency. Scale formation depends on the local water composition, the water
consumption and the water temperature setting. A water temperature setting of
maximum 60°C is recommended for prevention of excessive scale buildup.
To guarantee a good, watertight seal around the cleaning opening, replace the
gasket, washers, bolts and, if necessary, the lid with new parts before
reassembly (see the figure). A special set is obtainable from the
supplier/manufacturer.
To simplify descaling and cleaning of the tank, the storage tank has a cleaning
opening.
1. Remove the cover plate (1) on the outer jacket (see the figure).
2. Undo the bolts.
3. Remove the cover and the gasket.
4. Inspect the storage tank and remove the loose limescale deposits and
contamination.
5. If the scale cannot be removed by hand, then the appliance will need to be
descaled using a descaling agent. Contact the supplier for advice on the
preferred descaling agent.
6. Close the cleaning opening. To avoid damage to the storage tank, tighten
the bolts that fasten the lid with a torque no greater than 50 Nm. Use suitable
tools for this.
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IMD-0512 R0
91