Xylem HV 1.1 - 1.2 - Manual (Page 57)

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16 Maintenance
The HV1.1-1.2 control unit does not require special maintenance.
However, the cooling fan and the vent should be freed of dust occasionally.
Notes:
When replacing the control card in a plant with more than one pump ensure, that the
same control card version (V/STK/X) is used in all Hydrovar units.
Fur further information, please ask your distributor!