A.O. Smith STE - 400, Инструкция по установке, эксплуатации и обслуживанию

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Installation, User and Service Manual
15
3 Maintenance
3.1 Preparation for
maintenance
3.2 Water-side
maintenance
3.2.1
3.2.1
Warning
Maintenance may only be carried out by a competent person.
At each service, the storage water heater 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
water heater model and the full serial number of the storage water heater. 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 water heater.
Water-side maintenance consists of descaling and cleaning the tank, cleaning the
elements and checking the anodes.
Cleaning the elements
Scale and lime build-up prevent effective conduction of the heat to the water. Periodic
cleaning and descaling the tank prevents build-up of these deposits. This increases the
service life of the element and also improves the heating process.
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 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 storage water heater is equipped with
a cleaning opening.