Decalcification Of The Removed Heat Exchanger; Fig. 32: Decalcification Of The Removed Heat Exchanger - oventrop Regumaq X-45 Operating Instructions Manual

Regumaq X-45
Troubleshooting
9.3.3 Decalcifi cation of the removed heat
exchanger
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).
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
4 6 17
(positions , , and
7
Connect a drain hose to each of the lower fi ll and drain
17
ball valves (positions
11).
8
Open the fi ll and drain ball valves to drain the pipes
and the heat exchanger.
9
Loosen all four union nuts of the heat exchanger using
32 and 38 mm spanners.
10
Carefully remove the heat exchanger and place it on a
fl at surface with the connections facing upwards.
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!
138114082-V04.04.2022
19
in Fig. 1 on page 11).
19
and in Fig. 1 on page
Fig. 32: Decalcifi cation of the removed heat exchanger
11
Fill both circuits of the heat exchanger with
decalcifying agent.
12
Finish the 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!
13
Drain the decalcifying agent.
14
Neutralise both circuits of the heat exchanger by
fl ushing with a lye solution.
15
Flush both circuits of the heat exchanger with potable
water for at least one minute.
The removed fl at seals are not reusable. Use new
seals for reassembly (see par. 4.2 on page 21).
16
Reinstall the heat exchanger in the station in the
reverse order of removal.
17
Vent the potable water circuit (see par 7.2 on page
29) and the storage cylinder circuit (see par. 7.1 on
page 28).
51