12
KLSC20-KLSC25-KLSC32-IM-DE-W-UK-08-2021-Rev.0 | Part no. 10084836
EN
ENGLISH
8 Maintenance
!
DANGER
Electricity!
Risk of death from electric shock!
h
Maintenance work on the boiler charging unit may only be
carried out once the power supply has been disconnected.
!
!
WARNING
Hot water!
Severe scalding possible.
h
Do not put hands into hot water when draining the boiler
charging unit. Allow the boiler charging unit to cool down before
completing any maintenance, cleaning or repair work.
!
!
WARNING
Hot surfaces!
Severe scalding possible.
h
Do not hold pipework or components while the unit is in
operation. Allow the boiler charging unit to cool down before
completing any maintenance, cleaning or repair work. Wear
heat-resistant safety gloves if it is necessary to work on hot
components.
NOTICE
Maintenance of the boiler charging unit must
be carried out only by specialist personnel who have been duly
trained and authorised by the manufacturer.
8.1 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. Mixing valve
• Check functionality of mixing valve.
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.
8.2 Replacing wear parts
Note that the boiler charging 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.
8.3 Removing the circulation pump
1. Disconnect the power supply and secure against
reconnection.
2. Remove the boiler charging unit (A) front cover.
3. Close the shut-off valves.
4. Remove the thermometer handles (B) and the intermediate
insulation (C).
5. Disconnect the circulation pump (D) from the power supply.
6. Undo the nuts (X) and remove the circulation pump.
8.4 Installing the circulation pump
1. Replace damaged or defective seals if necessary.
2. Fit the circulation pump and tighten the nuts (X) (see
Chapter 3 on page 4 for tightening torques).
3. Connect the circulation pump (D) to the power supply.
4. Slowly open the ball valve by turning the thermometer
handle (B).
5. Slowly pressurise the boiler charging unit and vent the
system.
6. Check the seals on the boiler charging unit are not leaking.
7. Reconnect the power supply to the boiler charging unit.
8. Remove the thermometer handles (B).
9. Fit the intermediate insulation (C), thermometer handles (B)
and front cover (A).
A
C
B
B
X
D
Fig. 8-1: Circulation pump removal and fitting
