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A.O. Smith ST 500 Manual

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29
3 Maintenance
3.1 Preparation for
maintenance
3.2 Water-side
maintenance
3.2.1
Warning
Maintenance may only be carried out by a competent person.
At each service, the storage tank undergoes maintenance on water side. The maintenance
must be carried out in the following order.
1. Preparation for maintenance
2. Water-side maintenance
3. Finalising maintenance
Note
Before ordering spare parts, it is important to write down the installation type, storage tank
model and the full serial number of the storage tank. These details can be found on the
rating plate. Only by ordering with this information can you be sure receiving correct spare
parts.
The preparation for maintenance consists of testing and checking if all components are still
working properly by completing the following steps:
1. Test the operation of the overflow valve of the protected cold supply setup. The water
should discharge out.
2. Check the drainage pipes from the discharge points of all valves and remove any scale
deposits that may be present.
3. Drain the storage tank.
Water-side maintenance consists of descaling and cleaning the tank and checking the
anodes.
Descaling and cleaning the tank
Scale and lime build-up prevent effective conduction of the heat to the water. Periodic
cleaning and descaling prevents build-up of these deposits. This increases the service life of
the storage tank, and also improves the heating process.
Take the rate of scale formation into account when deciding on the service interval. 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 the
prevention of excessive scale build-up.
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. Spare parts are
obtainable from the supplier/manufacturer.
To simplify descaling and cleaning of the tank, the storage tank is equipped with a cleaning
opening.
… 29 …


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