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HIU2-IM-DE-W-UK-04-2021-Rev7 | Part no. 10078860 17
EN
ENGLISH
7.1 Annual maintenance intervals
1. General visual inspection
Check the station for leaks, annual maintenance intervals,
if necessary
1. General visual inspections
Check the station for leaks and retighten sealing connec-
tions or replace seals, as required.
2. Functional checks
Check that settings and operating and performance
parameters are set correctly.
Check flow noise during operation.
Ask users if there are any noticeable problems.
3. Ball valves
Check that stop valves and ball valves can move freely.
4. Dirt trap
Check and clean the dirt trap.
5. Plate heat exchanger
Check the plate heat exchanger for limescale deposits and
clean if necessary.
6. Actions following maintenance work
Check that all screw fittings that were unscrewed have
been retightened and retighten if necessary.
Remove all tools, materials and other equipment used from
the working area.
Restore the power supply.
Slowly pressurize the HIU2 and vent it.
Readjust the system settings if required.
7.2 Replacement of wear parts
Please note that the HIU 2 contains parts that, for technical
reasons, are subject to wear depending on the intensity of
use, even if the specified care and maintenance have been
observed.
This especially applies to mechanical parts and parts that
come into contact with water and steam, such as hoses,
seals, valves, etc.
By their nature, defects caused by wear do not constitute a
fault and are therefore not covered by the warranty or any
guarantee. Nevertheless, these defects and malfunctions
must be remedied only by trained specialist personnel.
Contact your specialist dealer for this.
7.3 Cleaning the dirt trap
1. Depressurize the HIU2 (e.g. by opening the vent valve).
2. Unscrew and remove the dirt trap and clean it.
3. Replace the filter into the dirt trap after cleaning.
4. Slowly open the stop valves and vent the system.
7.4 Replacing the plate heat exchanger
1. Close all stop valves.
2. Depressurize the HIU2 (e.g. by opening the vent valve).
3. Loosen the nuts (pos. A) and remove the plate heat
exchanger.
A
A
4. Replace all seals.
5. Insert the new plate heat exchanger and tighten the nuts
(pos. A). (Refer to the "Technical data" chapter for the
torque).
6. Slowly open the stop valves.
7. Slowly pressurize the HIU2, fill and vent it.
17


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