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Troubleshooting
9.4
Cleaning of the fl ow sensor
A breakdown has occurred if no potable hot water can
be added at the draw-off points. This can be caused by
a number of reasons as shown in the troubleshooting
table in section 9.1 on page 37.
f If easily identifi able causes such as a disconnected
controller can be excluded, check the fl ow sensor
for contamination.
A contaminated sensor means that the volume
fl ow of the cold water supply or of the cold
water supply with circulation pipe will no longer
be detected. The consequence of this is that
no more drawing off can be registered and
the circulation pump for the storage cylinder
circuit is no longer activated. No more heat will
be transferred from the heat exchanger to the
potable water circuit.
7
5
4
3
1
17
Illust. 36: Potable water circuit
(1)
Temperature sensor for potable hot water S2
(3)
Heat exchanger
(4)
Fill and drain ball valve for potable cold water
(5)
Flow sensor for potable water circuit VTY 20
(7)
Isolating ball valve for potable hot water
(9)
Isolating ball valve for potable cold water
(10) Safety valve for potable water circuit (10 bar)
(11) Connection for circulation pipe
(12) Temperature sensor for potable cold water /
circulation, S3
(17) Fill and drain ball valve for potable hot water
42
10
9
11
12
9.4.1
Required tools
• 24, 37 and 38 mm spanner
• Fuse tongs J2 (e.g. EAN 4003773048534).
9.4.2
Cleaning of the measuring turbine
CAUTION
Risk of scalding due to hot fl uids!
If the station has been in operation, there is a
risk of scalding due to the unintentional dis-
charge of hot water or steam.
f Allow the system to cool down.
f Wear safety goggles.
CAUTION
Risk of burns due to hot components!
Any unprotected contact with hot components
may lead to burns.
f Wear safety gloves.
NOTICE
Risk of damage due to pressure surge!
Sudden fi lling of the station with water may
lead to damage, for instance to the sensors or
sealing points.
f Always open and close ball valves slowly.
1. Completely disconnect the controller (all poles) from
the power supply.
2. Close the isolating ball valve for potable hot water
slowly (see position (7) in Illust. 36 and in Illust. 1 on
page 10).
3. Close the isolating ball valve for potable cold water
slowly (see position (9) in Illust. 36 and in Illust. 1 on
page 10).
4. Unscrew the cap of the lower fi ll and drain ball valve
(see position 17 in Illust. 36
10).
5. Close the draining hose for potable water at the
lower fi ll and drain ball valve (position (17) in Illust.
and in Illust. 1 on page 10).
36
6. Open the lower fi ll and drain ball valve for potable
cold water (see position 17 in Illust. 36
1 on page 10 ).
"Regumaq X-25"
and in Illust. 1 on page
and in Illust.
138112581-V01.10.2019
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