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4
4.1 Preparation for
maintenance
4.2 Water-side
maintenance
4.2.1
0312751_SIVS_100-220_UK_V4.1, 2022-06-27
Maintenance
Warning
Maintenance may only be carried out by a competent person.
At each service, the indirect 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. Finalizing maintenance
Note
Before ordering spare parts, it is important to write down the installation type, indirect
water heater model and the full serial number of the indirect water heater. These details
can be found on the rating plate. Only by ordering with this information can you be sure
receiving the correct spare parts.
The preparation for maintenance consists out of testing and checking if all components
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 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 indirect water heater.
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 indirect 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 indirect water heater is equipped with
a cleaning opening.
Work order:
1. Undo bolts from the cover.
2. Remove cover and the gasket.
3. Inspect the tank and remove the loose scale deposits and contamination.
4. If the scale cannot be removed by hand, descale the water heater with a descaling
agent. Contact the supplier/manufacturer for advice on what descaling agent to use.
5. Close the cleaning opening. To avoid damage to the tank, tighten the bolts that
fasten the lid, with a torque no greater than 50 Nm. Use suitable tools for this.
15
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