Malfunctions; Maintenance / Service - OEG SecuFresh 22 Montage- Und Bedienungsanleitung

Malfunction Possible cause
Pump noise Air in the system
Insufficient tapping Insufficient water pressure
quantity
Calcification in heat
exchanger
Insufficient tapping Incorrect thermostat setting Incorrect thermostat setting
temperature Excessive pressure loss in the Check the piping, change if
piping on the heating side
Drinking water does Air in the system.
not heat up Hot water flow switch not
connected correctly or
faulty.
Stainless steel spiral sensor
calcified or faulty
Pump faulty
The manufacturer recommends having the system serviced annually by authorised,
specialist personnel.
Cleaning the heat exchanger
Regularly clean the unit if deposit build-up can be expected due to unfavourable water
quality (e.g. extremely hard water or pronounced soiling). Cleaning maintains the flow
rates in the event of scale deposits, but it also reduces the service life.
There is the option of cleaning the unit by flushing it.
Flush the heat exchanger in the direction opposite to the normal flow direction using a
suitable cleaning solution.
Make sure any chemicals used for cleaning are suitable for stainless steel, copper or
nickel. Non-compliance may result in permanent damage to the heat exchanger! Always
observe the cleaning agent manufacturers' safety instructions and recommendations.
Use only chloride-free water or water with a low chloride content and water hardness for
cleaning solutions. Choose the cleaning agent to match the type of contamination and
resistance of the heat exchanger plates. It is important to obtain confirmation from the
cleaning agent manufacturer that the cleaning agent will not cause corrosion of the heat
exchanger plates to be cleaned. Clean the heat exchanger as per the cleaning agent
manufacturer's work instructions.
After cleaning, the acid remaining in the system must be neutralised and the metal
surfaces passivated. Passivation is mandatory to prevent any development of corrosion.
Always rinse the clean heat exchanger and system using a sufficient amount of fresh
water.
SecuFresh 22 and SecuFresh 29 Frischwasserstation
Remedy
Bleed
Check pressure, increase if
necessary
Decalcify/replace
necessary
Bleed
Check, replace if applicable
Check, replace if applicable
Check, replace if applicable
27

Malfunctions/

7
troubleshooting
8

Maintenance / service

GB