Idegis DOM-12, Hardware Installation And Maintenance Manual

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6. MAINTENANCE: _______________________________________________________________________________________________
6.1. Maintenance of the electrolysis cell
The electrolysis cell must be kept in suitable conditions to ensure a long lifetime. This salt chlorination unit has an automatic electrode
cleaning system that helps to prevent scale build-up on the electrode surface. If the salt chlorination system is operated in accordance with
these instructions, and in particular if the pool water balance is kept within the recommended parameters, it should not be necessary to
manually clean the electrodes. However, if the pool water and the salt chlorination system are not maintained in line with these instructions
then it may be necessary to manually clean the electrodes following the procedure outlined below:
1. Cut off the 230 Vac unit’s supply.
2. Unscrew the closing nut located at the end where the electrodes are located, and remove the electrode package.
3. Use diluted hydrochloric acid (a part of commercial acid in 10 parts of water), submerging the electrode package in the prepared
solution for no more than 10 minutes.
4. NEVER SCRAPE OR SWEEP THE CELL OR THE ELECTRODES.
The electrodes of a salt chlorination system comprise of a titanium sheet coated with a layer of noble metal oxides. The electrolysis
processes that take place on their surface produce a progressive wearing down – the electrodes do have a finite life. In order to optimise
electrode lifetime, please consider the following aspects:
1. Although all DOMOTIC series salt electrolysis units are SELF-CLEANING, a prolonged operation of the system at pH values over
7.6 in waters of high hardness can produce scale formation on the surface of the electrodes. Scaling on the electrodes surface will
progressively deteriorate the coating, causing a decrease of lifetime.
2. Manually cleaning/washing the electrodes (as described above) will shorten their life.
3. Prolonged operation of the system at salinities lower than 3 g/l (3000 ppm) will cause a premature deterioration of the electrodes.
4. Frequent use of copper based algaecides will promote the formation of copper deposits on the electrodes, progressively damaging
the coating. Remember that chlorine is the best algicide.
6.2. Calibration of the pH sensor (only in DOM-XX PH and DOM-XX PLUS models)
The integrated pH-controller has two calibration modes of the pH-sensor: “FAST” and “STANDARD”. We recommend carrying out it at least
once a month during the period of use of the swimming pool.
6.2.1. “FAST” MODE
“FAST” MODE allows the calibration of the pH-sensor when there are small reading deviations with no need to extract the sensor from the
installation or to use calibration solutions.
PROCEDURE:
1. Be sure the point of insertion of the pH-sensor is flooded, and the pump is in recirculation.
2. Using a pH-test kit, measure the water pH of the swimming pool.
3. Press the “CAL” [17] key for approx. 5 seconds until the equipment beeps and release the key. The pH [18], screen will blink “7.0”.
4. Keep the “SET” [20] key pressed until the pH-value previously measured in the water with the pH-test kit appears. Once reached,
loosen and press “CAL” [17] key. If no error has been detected, the system will have been calibrated.
Fig. 32