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7 Maintenance
Electricity!
Maintenance work on the pump unit may
only be carried out once the power supply
has been disconnected.
Hot water!
Severe scalding possible.
Do not put hands into hot water when drain-
ing the pump unit.
Allow the pump unit to cool before carrying
out any maintenance, cleaning or work repair.
Hot surfaces!
Severe burns possible.
Do not hold pipework or components while
the unit is in operation.
Allow the pump unit to cool before carrying
out any maintenance, cleaning or work repair.
Wear heat-resistant safety gloves if it is
necessary to work on hot components.
Maintenance of the pump unit must be
carried out only by specialist personnel who
have been duly trained and authorised by the
manufacturer.
10
7.1 Annual maintenance schedule
1. General visual inspection
• Check the unit for leaks and retighten connections with flat
seals or replace the seals.
2. Functional check
• Check the correct adjustment and operating and
performance parameters.
• Check for noisy operation.
• Check with the user in the event of anomalies.
3. Ball valves
• Check for correct operation of shut-off valves and ball
valves.
4. Pump
• Be aware of noise build-up in the pump.
5. 3-way mixing valve (HKM only)
• Check functionality of the 3-way mixing valve.
6. Actuator (HKM only)
• Check functionality of actuator.
7. Post-maintenance checks
• Check all loosened screw connections for a firm seating
and retighten if necessary.
• Remove all tools, materials and other equipment used from
the work area.
• Bleed the system.
7.2 Replacing wear parts
Note that the pump unit has parts which are subject to wear
that naturally occurs as a result of normal use even when
properly maintained and serviced.
Specifically, these are mechanical parts and parts which are
in contact with hot water and steam such as hoses, seals,
valves, etc.
Normal wear and tear is not a defect and is not covered under
warranty or guarantee. Nevertheless, defects and malfunctions
may only ever be remedied by trained specialist personnel.
Contact your specialist dealer for more information.
IM-HKM40-50_HK40-50-DE-W-UK-12-2019-Rev.1 | Part no. 10083684
ENGLISH
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