Faults
37
Stora – 6721835341 (2021/04)
9.4.2
Drain work
▶ Disconnect the cylinder from the mains power supply and drain
before carrying out any cleaning or repairs.
▶ Drain the heat exchanger.
Blow out the lower coils if required.
9.4.3
Descaling and cleaning
In order to improve the cleaning effect, heat up the heat exchanger
prior to cleaning it with a water jet. The thermal shock effect separates
deposits (e.g. limescale) more readily.
▶ Isolate the cylinder from the piping on the domestic water side.
▶ Close the shut-off valves and isolate the immersion heater (if used)
from the mains power supply.
▶ Drain the cylinder.
▶ Open the inspection aperture on the cylinder.
▶ Check the interior of the cylinder for pollution.
-or-
▶
In the case of soft water:
Check the container regularly and clean to remove limescale.
-or-
▶
In the case of hard water or severe pollution:
Regularly descale the cylinder in line with the actual amount of
limescale using chemical cleaning methods (e.g. with a suitable
descaling agent based on citric acid).
▶ Hose down the inside of the cylinder.
▶ Use a wet & dry vacuum cleaner with plastic suction hose to remove
the residues.
▶ Use a new gasket to seal the inspection aperture.
Cylinder with inspection aperture
NOTICE
Water damage!
If the gasket is defective or corroded this could cause water damage.
▶ Check the gasket of the cleaning flange during cleaning and replace.
9.4.4
Recommissioning
▶ Flush the cylinder thoroughly after cleaning or repair.
▶ Vent on the heating side and on the domestic water side.
9.5
Function check
NOTICE
Damage through positive pressure.
A pressure-relief valve malfunction can result in damage due to positive
pressure.
▶ Check the pressure-relief valve function and flush through several
times by venting.
▶ Never close the blow-off opening of the pressure-relief valve.
10
Faults
Clogged connections
In combination with a copper pipe installation, connections may become
clogged in unfavourable conditions due to the electrochemical action
between the magnesium anode and pipe material.
▶ Use insulation fittings to electrically isolate connections
from the copper pipe installation.
Odour problems and dark discolouration of the heated water
This is normally caused by the formation of hydrogen sulphide due to
sulphate-reducing bacteria. The bacteria are present in water with a very
low oxygen content, and release the oxygen from the residual sulphate
(SO
4
) which produces strong smelling hydrogen sulphide.
▶ Clean the container, replace the anode and operate at ≥ 60 °C.
▶ If this does not effectively remedy the situation: replace the anode
with an external current anode. The user bears the costs of the
conversion.
Activation of the high limit safety cut-out
If the high limit safety cut-out in the wall mounted boiler is repeatedly
activated:
▶ Inform the installer.
11
Data Protection Notice
We,
Bosch Thermotechnology Ltd., Cotswold Way,
Warndon, Worcester WR4 9SW, United Kingdom
process product and installation information,
technical and connection data, communication data,
product registration and client history data to provide
product functionality (art. 6 (1) sentence 1 (b)
GDPR), to fulfil our duty of product surveillance and for product safety
and security reasons (art. 6 (1) sentence 1 (f) GDPR), to safeguard our
rights in connection with warranty and product registration questions
(art. 6 (1) sentence 1 (f) GDPR) and to analyze the distribution of our
products and to provide individualized information and offers related to
the product (art. 6 (1) sentence 1 (f) GDPR). To provide services such as
sales and marketing services, contract management, payment handling,
programming, data hosting and hotline services we can commission and
transfer data to external service providers and/or Bosch affiliated
enterprises. In some cases, but only if appropriate data protection is
ensured, personal data might be transferred to recipients located
outside of the European Economic Area. Further information are
provided on request. You can contact our Data Protection Officer under:
Data Protection Officer, Information Security and Privacy (C/ISP),
Robert Bosch GmbH, Postfach 30 02 20, 70442 Stuttgart, GERMANY.
You have the right to object, on grounds relating to your particular
situation or where personal data are processed for direct marketing
purposes, at any time to processing of your personal data which is based
on art. 6 (1) sentence 1 (f) GDPR. To exercise your rights, please contact
us via
privacy.ttgb@bosch.com
To find further information, please
follow the QR-Code.
Summary of Contents for 8735100975
Page 57: ...57 Stora 6721835341 2021 04 2 0010037827 001 1 1 13 2 3 4 9 10 11 13 14 12 8 5 6 7 ...
Page 59: ...59 Stora 6721835341 2021 04 4 1 WP 400 PK 2 WP 500 P 0010037816 001 5 6 ...
Page 60: ...Stora 6721835341 2021 04 60 7 8 ...
Page 61: ......
Page 62: ......
Page 63: ......
Page 64: ...Bosch Thermotechnik GmbH Junkersstrasse 20 24 D 73249 Wernau www bosch thermotechnology com ...
