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A.O. Smith IT 300 Manual

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IT 300
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 water heater undergoes maintenance on water side. The maintenance
must be carried out in the following order.
1. Preperation for maintenance
2. Water-side maintenance
3. Finalizing maintenance
Note
Before ordering spaer parts, it is importent te write down the installation type, water heater
model and the full serial number of the water heater. These details can be found on the
rating plate. Only by ordering with this information can you be sure receive the correct spare
parts.
The preparation for maintenance consits out of testing and checking if all componets are still
working properly, complete the following steps:
1. Test the operation of the overflow valve of the protected cold supply setup. The water
should purt 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 water heater.
Water-side maintenance consits ouf 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 water heater, 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 water heater is equipped with a cleaning
opening.
… 29 …


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