5.Control system - Meibes

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7. System examples 7.7 Disinfecting the hot water and circulation pipes During the disinfection of the hot water and circulation pipes, very high temperatures are generated. There is a danger of scalding! Qualified personnel should take the necessary precautions for the protection of persons and property! 8. Releasing operating level for specialist tradesmen! ■ In the basic setting menu press the „down“ key downwards nine times until submenu release is attained [values]. ■ Now press „right” key twice, this causes “off” to flash. ■ Press the „up“ and „down“ and „right“ keys simultaneously for approx. 2 s, release switches to “on”. ■ Thereafter leave the menu by using the “left” key. The releasing of the operating level can be reset again in the same way. Access to the adjustable values is blocked automatically after 60 minutes! Example for setting the control system: 1. Release the operating level for the specialist tradesmen in the basic setting menu. 2. In the basic setting menu, submenu disinfection, select “in”. 3. Set the hot water set value. Adjustment range 65 - 75°C 4. Select disinfection time (duration of disinfection) Adjustment range 0 - 60 minutes 5. Select the day, week day or daily. 6. Start time (0 - 24 hours) This function should be deactivated after disinfection! The function is described in 5.3.5! 17
9. Trouble-shooting The following is to be checked if the domestic hot water temperature is not reached: ■ System voltage (fuses) ■ Buffer temperature ■ Vent the freshwater station ■ A temperature sensor interruption or a short circuit is displayed in the information menu by a flashing general error message and is shown individually when requesting each sensor. ■ Carry out characteristic curve calibration, from point 6.3.2. ■ Carry out a circulation adjustment, point 6.3.3. ■ During a hot water withdrawal, the circulation pipe becomes cold. Cause: The return flow preventer in the connecting nipple above the circulation pump can start leaking due to soiling in the cold water network. ■ Flow rate metre: To check this, a hot water tapping is required and the flow in litres per minute read in the information menu. An intact flow rate metre should show a relatively constant value. Should fluctuations occur, check whether this comes from the domestic water network, for example in pressure increase systems ■ Set the freshwater station according to the system examples. ■ The pumps P1 and P2 run alternatively and the status display in the information menu switches between active 50, after-run and off. ■ Carry out a circulation adjustment, point 6.3.3. ■ After several months of smooth running operation the hot water capacity is no longer reached. ■ If a dirt filter has been installed in front of the station, this should be cleaned. ■ Check return flow preventer. ■ Vent the buffer and the freshwater station 18 ■ A short time after drawing off hot water at the tap (e.g.: washbasin) the hot water temperature drops sharply even though the control system displays e.g.: 50°C hot water temperature. ■ The return flow preventer should be checked in the connecting nipple above the circulation pump to see if it leaks as a result of soiling in the cold water system and if cold water has been pressed into the circulation piping. ■ The circulation does not work: ■ Carry out circulation adjustment! ■ Check time slot! ■ The temperature of the heat transfer media in the buffer is too low. The circulation set temperature + 2 K is not being reached at T2 or at T5, if present. (see point 5.3.5 Circulation) Please ensure that there is a sufficient quantity of heat in the buffer! With option T5 „reheat buffer“, a type of boiler can be activated.
Page 1 and 2: Technical information for installat
Page 3 and 4: 1. Safety instructions ■ The inst
Page 5 and 6: 3. Equipment and functional descrip
Page 7 and 8: 5. Control system 5.1 Display descr
Page 9 and 10: 5. Control system 5.3.1 Explanation
Page 11 and 12: 5. Control system If a buffer senso
Page 13 and 14: 6. Initial operation and system cal
Page 15 and 16: 7. System examples 7.1 Freshwater s
Page 17: 7. System examples 7.6 Freshwater s
Page 21 and 22: 11. Diagrams Pressure loss [bar] 20

5.Control system - Meibes

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