5.Control system - Meibes

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7. System examples 7.4 Freshwater station with reheating option and/or activation The freshwater station with or without circulation can be extended by two functions via an additional temperature sensor T5 (not included in delivery) in the buffer. These functions must be activated in the basic setting menu. Point 5.3.5 The temperature sensor T5 becomes visible in the information menu after activation. 1. A boiler must be requested to reheat the buffer. For this a potential-free contact S1 on the control circuit board is used. This contact can be charged with 4 A 230 V AC. A description as well as the settings for the reheating option is found under point 5.3.5, reheating menu item. 2. The same temperature sensor T5 can be used to specify the buffer temperature, from where the hot water regulation and the circulation are activated. This function makes sense if the buffer temperature could at some point take on unfavourably low values as a result of renewable energy sources, and if the freshwater station should not yet run at such low buffer temperatures. A description as well as the settings for the option activation can be found under point 5.3.5, Activation menu item. 7.5 Increasing the domestic water set value The following example is used to show what factors should be taken into account when the domestic hot water temperature is to be increased from 50°C to 60°C: 1. WW – set value increase 2. Increase the electronic safety shutdown and install a blending valve. 3. Carry out a characteristic curve calibration! re 1. In the programming menu, submenu heat transfer, increase the hot water set value from 50°C to 60°C. To do this, select 50°C with the right key. Once 50°C flashes, the value can be increased to 60°C by using the upper key. Thereafter, confirm by pressing the right key twice. re 2. Release the operating level for the specialist tradesmen in the basic setting menu. See point 7. In the programming menu, submenu controller, increase the menu item 60°C deactivation from 60°C to 70°C. To do this, the submenu controller must be selected by pressing the right key once until the bracket goes out. Then press the lower key once. 60°C activate will be displayed. Now select by pressing the right key once until the 60°C flashes. Using the upper key, increase to 70°C and confirm by pressing the right key twice. You have now increased the safety shutdown (scalding protection) of the control system to a higher value and must now re-install a blending valve on the hot water outlet! re 3. Characteristic curve calibration see point 6.2 to 6.3.2 15
7. System examples 7.6 Freshwater station as cascade connection Should larger volumes of hot water be needed, overflow valves allow for the interconnection of two or more freshwater stations as a cascade. Here, the service water circulation module can be left out for the second and other freshwater stations. The circulation is controlled only by the first freshwater station. Basic circuit diagram: Second station First station Required accessories: Overflow valve DN 25 for Cascade connection Adjustment range: 100 to 500 mbar Article no.: 69072.9 16 Domestic water hot Domestic water cold 7.6.1 Initial operation and system calibration of the freshwater cascade First station ■ Initial operation and system calibration from point 6 ■ Setting the time and date, point 5.3.3 ■ Domestic hot ■ set value e.g.: 50°C, point water 5.3.3 and 5.3.5 ■ Circulation ■ Basic setting menu, Circulation submenu = select “on”, point 5.3.5 ■ In programming menu, circulation submenu up to 3 select time slot, point 5.3.3 ■ Circulation temperature 40°C, for control in time slot, point 5.3.5 ■ Circulation time e.g.: 60 s, Circulation rest time.: e.g. 10 min, for controlling the circulation through tapping detection outside the time slot, point 5.3.5 ■ Heat transfer unit ■ WT = cold, point 5.3.3 ■ Time lag ■ e.g.: 20 s, point 5.3.5 Second station ■ Initial operation and system calibration: The determined values of the characteristic curve calibration of the first station are taken over. These values are read in the first control system in the basic setting menu, characteristic curve submenu and in the same menu they are set in the second control system. ■ Setting the time and date, point 5.3.3 ■ Domestic hot ■ Set value e.g.: 50°C, water point 5.3.3 and 5.3.5 ■ Circulation off ■ Heat transfer unit ■ WT = cold, point 5.3.3 ■ After-run ■ e.g.: 20 s, point 5.3.5 Differential pressure-overflow valve Hot water should be drawn off of e.g.: 35l/min. This domestic water volumetric flow can be read in the control system information menu of the first freshwater station. Set the differential pressureoverflow valve so that the second freshwater station starts operating (determination of opening pressure of the overflow valve). Loosen the locking screw at the differential pressure-overflow valve. Afterwards the opening pressure can be adjusted in stages by turning the hand wheel valve. The selected position should subsequently be checked at the locking screw to ensure it against accidental adjustment.
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: 7. System examples 7.1 Freshwater s
Page 19 and 20: 9. Trouble-shooting The following i
Page 21 and 22: 11. Diagrams Pressure loss [bar] 20

5.Control system - Meibes

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