A.O. Smith GWV - 120 User Manual

Instruction manual GWV

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The following steps must be carried out on the water side:
1.

2.

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.

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.

1