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Regumaq X-45
Troubleshooting
9.3
Decalcifi cation of the heat
exchanger
If you notice during operation of the system that the
potable water is no longer heated to the required
temperature, even though the controller does not indicate
an error and you have not changed the temperature
setting, limescale deposits may have formed in the heat
exchanger.
Due to the high temperatures in fresh water sta-
tions, calcifi cation of the installed heat exchang-
ers cannot generally be avoided. This is especially
true when using a circulation pipe..
NOTICE
Risk of environmental pollution!
Chemicals for decalcifi cation can cause
environmental damage if disposed of improperly.
!
Follow the decalcifi cation agent manufacturer's
disposal instructions..
You can decalcify the heat exchanger both when it is
removed and when it is installed.
9.3.1
Decalcifi cation of the potable water
circuit with the heat exchanger installed
CAUTION
Risk of scalding due to hot media!
If the station has been in operation, there is a risk of
scalding due to unintentional escape of hot water
or water steam.
!
Allow the system to cool down.
!
Wear safety goggles.
CAUTION
Risk of burns on hot components!
Touching hot components can cause burns.
!
Wear safety gloves.
NOTICE
Risk of damage due to pressure surge!
The abrupt injection of water into the station can
lead to damage, e.g. to the sensors or sealing
points.
!
Always open and close ball valves slowly.
1
Disconnect the controller from the power supply at all
poles.
2
Close the shutoff ball valve for potable water (hot)
7
(position
in Fig. 1 on page 11).
3
Close the shutoff ball valve for potable water (cold)
9
(position
in Fig. 1 on page 11).
4
Close the shutoff ball valve for storage cylinder circuit
16
return (position
in Fig. 1 on page 11).
138114082-V04.04.2022
5
Close the shutoff ball valve for storage cylinder circuit
18
supply (position
in Fig. 1 on page 11).
6
Unscrew the caps of the fi ll and drain ball valves for
potable water (cold and hot) (positions
Fig. 1 on page 11).
7
Connect one fl ushing hose each to the fi ll and drain
ball valves for potable water (cold and hot) (positions
4
17
and
in Fig. 1 on page 11).
Observe the fl ow direction of the decalcifi cation
agent. It must fl ow in the opposite direction to
the intended direction of fl ow of the potable wa-
ter in the potable water circuit.
Only use a decalcifi cation agent approved by the
DVGW, e.g. based on citric acid, to decalcify the
heat exchanger. Observe DVGW work sheets
W291 and 319!
8
Slowly open the fi ll and drain ball valves for potable
water (cold and hot) (positions
page 11) to initiate fl ushing with the decalcifi cation
agent.
9
Finish the fl ushing process after the prescribed
exposure time has elapsed.
The exposure times depend on the decalcifying
agents used. Decalcifying agents may have to be
heated. Follow the instructions of the decalcifi ca-
tion agent manufacturer!
10
Drain the liquid with the fl ushed out limescale residues
from the fl ushing circuit.
Flushing with a lye solution
11
Neutralise the potable water circuit by fl ushing with a
lye solution.
12
Close the upper fi ll and drain ball valve for potable
4
water (cold) (position
13
Remove the fl ushing hoses.
Z
The decalcifi cation fl ushing is completed.
Flushing of the potable water circuit with
potable water
14
Connect the drain hose for potable water to the lower
fi ll and drain ball valve for potable water (hot) (position
17
in Fig. 1 on page 11on page).
15
Open the shutoff ball valve for potable water (cold)
9
(position
in Fig. 1 on page 11) slightly.
Z
The heat exchanger is fl ushed with potable water.
16
Wait at least one minute.
17
Close the fi ll and drain ball valve for potable water
17
(hot) (position
in Fig. 1 on page 11).
18
Remove the drain hose.
19
Screw the caps back onto the fi ll and drain ball valves
for potable water (cold and hot).
Z
The decalcifi cation of the potable water circuit with
the heat exchanger installed is completed.
4
17
and
in
4
17
and
in Fig. 1 on
in Fig. 1 on page 11).
49
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