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1. WWW NATURELA BG COM office naturela bg com CERTIFIED ISO 9001 w 13 ANA FELIXOVA 359 52 504 506 G LC NI AIl PEI A 9020 VARNA BULGARIA 359 52 504 507 Electronic temperature regulator NHC 34 software version 3 2r User Manual F Anode Low lr i Smari control NHC 34 is an electronic temperature regulator designed to run and control high class electrical water heaters It has 4 control buttons a graphical LCD display a relay to power up a mono phase heating element of up to 3 5 kW power one or two temperature sensors and a circuit to detect current leakages and to monitor the condition of the anode protection The software has a new smart algorithm to decrease the consumption of electrical energy The main goal of the temperature regulator is to control the heating of your water heater as effectively as possible so you don t have to take any care of it at all NHC 34 User Manual ver 2 7 1 Information displayed on the screen The display has 3 main views to differ the three main conditions of the water heater Water heater on Water heater off Settings 1 1 Screen view I Water heater on On 14 2 This is the screen view of the main work mode The information is displayed in 6 fields 1 1 1 1 1 2 Condition of the anode protector shows the condition of the anode protector of the water tank The more lines are shown on the display the better the condition of the anode protector is The2. the parameter will stop blinking and only its value will change e Press the F button to exit the current menu If you have made any changes they will be saved and you will exit the settings If you haven t made any changes the F button forwards to the next menu if there is any e If the clock hasn t been set it blinks In this case you can enter the time and date setting menu even when the water heater is off Screen View II NHC 34 User Manual ver 2 7 Setting menus in NHC 34 e Next start Set the time and date when the heating element has to turn on for the Delayed start To be able to use this mode you have to set the exact time for the delayed start The set time must be after the current time otherwise after you confirm the setting you will see an Error sign 17 10 28 01 2011 e Set Time Setting the system time in format HH MM 28 01 2011 The time and date must be set in order for the water heater to function properly Set On Off Time Set the time intervals when the heating element is allowed to turn on while the temperature regulator is in Heating with timers mode The heating element turns on when the temperature of the water gets below the set temperature but only during these intervals The start time is on the left side of the screen and the end time of the interval is on the right side The format of the time is HH MM To activate the time interval put a check sign on the box before it
3. it to work and don t need hot water just leave it off from the menu but not from the power supply Thus when the temperature of the water gets too low the heating element will turn on to prevent it from freezing and damaging the tank 2 2 Setting the temperature When the water heater is working in any of the work modes except Smart control you can change the set temperature by pressing any of the buttons A or VW The field Temperature of the water starts blinking and above the temperature appears sign Temp Press any of the same buttons to change the setting in the relevant direction Press the Enter button to save the setting or wait 5 seconds without pressing any buttons If you press and hold any of the buttons A or Y for more than 0 8 seconds the value automatically changes in the relevant direction with 3 units per second The range for the set temperature is between 20 C and 75 C ERHI 2 3 Settings To enter the settings the water heater has to be on Screen View I Press and hold the F button for more than 1 5 seconds In this mode the buttons have the following functions e The value that could be changed blinks e The Enter button forwards to the next editable value on the current screen e A and W increase or decrease the value of the blinking parameter Press and hold any of these buttons for more than 0 8 seconds to change the value faster with 3 units per second if you do that
4. set On Off Time a 00 00 7 00 00 eee NHC 34 User Manual ver 2 7 NHC 34 monmycka ci0x xKHO OOpa3yBaHe Ha MHTepBaIMTe HallpHMep KoraToO HayasIOTO Ha Taiimep 1 Ce IIPHKIIFOUBa OT kpas Ha TaliMep 2 H T H e Set Time xt Set the start time of the daily 3 and the night electricity rate This is necessary for the correct calculation of the consumed energy The correct setting of these parameters is also important for the efficiency of the Smart control mode Set Time C e Additional setting of the saving strategy for Smart control mode to completely meet the needs of hot water The possible options for the line Mode are Eco Normal and Power Eco is the most economical mode If it doesn t provide enough hot water for your needs try to use any of the other two modes Usually during the winter the temperature of the water is much lower When it mixes up with the water in the water heater the total volume of hot water decreases Activate the line Seasonal to compensate about this H smart control Mode Eco_ Seasonal y 7 7 A SSSSSSS0ERsa cy aa NHC 34 User Manual ver 2 7 e Language Choose the system language that you prefer 15 h 1 0002 kwh 16 26 When the water heater is in any of the work modes switch between the measured and set parameters by pressing the Enter button You can see them in the field Measured or set parameters or the screen Diagrams this screen appear
5. 0 28 01 2011 Every setting screen looks similar to the above On the top underlined row is the name of the setting and in the middle of the screen are the variable values NHC 34 User Manual ver 2 7 2 How to use the temperature regulator 2 1 Turning on the heating element and changing the work mode When the water heater is off the display is in Screen view II Press the F button to turn it on The display switches to Screen view I If there aren t any restrictions for heating up the water i e the field Work mode is empty and if the set temperature is higher than the current temperature field Temperature of the water the heating element turns on This is indicated by a running dot in the sign for an active heating element in the top right corner of the screen rien Ha ekpauHa 6e3 aHOJIeH IIpOTeKTOP There are 4 work modes Press the F button to switch between them They appear as follows Water heater OFF Heating mode Smart control Heating with timers Delayed start After the last work mode the temperature regulator switches to Water heater OFF again At this state the display shows only date time and the condition of the anode protector The heating element doesn t turn on unless there is a chance for the water to freeze NHC 34 User Manual ver 2 7 2 1 1 Heating mode Anode Low While working in this mode the heating element turns on when the temperature of the water gets 5 C lo
6. er Case XG EEEE ieee i 1 D At S JP 7i y Mg Electrode n f A I mg i i Temperature ar Sensor L p Ed tA MAINS ii 230 240 V AC SENN gt NHC 34 Wiring Diagram S P A a t 1 T 20VA 5 O Bm CE amp VN30 15 10759 www marechner com PRI 1 6 230V 50 60Hz SC 7 9 75V 266mA rma Kw04 15 MARSTNNER i ta70 C F il HEATER 3 5 KW MAX A wiring diagram of the temperature regulator NHC 34 ver7 with a water heater Note The models with stainless steel tanks are missing the wires from the ground terminal to A from A to the Magnesium anode and the Magnesium anode itself NHC 34 User Manual ver 2 7
7. maximum number of lines is indicated by their contours If your water heater s tank is made of stainless steel it doesn t have an anode protector and this field is not displayed Work mode gives information if the water heater is in any special work mode with restricted active time of the heating element There are several different situations an empty field the heating element turns on and off depending only on the set temperature time for the next turning on or off the heating element turns on or off depending not only on the set temperature but also if its work is allowed for the current time time for the next turning on and a date this is the Delayed Start mode The heater turns on at the set time and on the set date a sign Smart Control the water heater works in economical mode to decrease the electricity expenses Measured or set parameters shows useful information about the set parameters current date or the consumed electricity on day or night rate Current time if the clock is not set this field blinks The temperature regulator has a battery that keeps the clock going in case of failure in the power supply If the power supply is off for more than 18 hours the clock turns off and has to be set again on the next turning on Temperature of the water current temperature of the water in the tank Have in mind that the temperature of the water is measured at the bottom of the ta
8. n set one of the time intervals during the night and the other during the day just before you will need the hot water The duration of the interval when the heating element is allowed to work must be conformed with the ability of your water heater to get to the set temperature for the same time You can get the information about the time your water heater needs to get to the set temperature from its user manual 2 1 4 Delayed start Anode Low me On 14 00 03 02 2044 When you plan to be off from home for few days and you need to have hot water when you get back you can use the Delayed start mode To activate it go to the menu Next start and set the desired time for the heating element to turn on It has to be after the current time At the set time for delayed start the water heater will switch to Heating mode NHC 34 User Manual ver 2 7 2 1 5 Turning the water heater off By pressing the F button you go through all the work modes and after the last one Delayed start the water heater turns off In this state the display looks like Screen View II and the heating element doesn t turn on Even when the water heater is off Screen View II the Anti frost function is still active Its purpose is to prevent the freezing of the water in the tank Therefore if there is a chance for the outside temperature to get really low it is recommended not to turn off the water heater from the mains power supply Even if you don t need
9. nk and the hot water goes up to the top from where it goes to the plumbing of the house Therefore it is possible despite the low temperature shown by the temperature regulator the real water temperature to be much higher This is a restriction of the measuring method and a precaution is necessary when using hot water only 1 1 6 Messages from NHC 34 all messages for registered problems appear in this field Possible errors NHC 34 User Manual ver 2 7 e Leakage There is a leakage bad insulation resistance from the heating element to the tank The heating element turns off and the next turning on is possible after plugging off and back on from the mains power supply Sensor E1 The temperature sensor is disconnected or damaged Sensor E2 The temperature sensor is on short Frost The temperature of the water in the tank is negative at the moment of turning on the water heater It is possible the water to be frozen In this situation the heating element won t turn on You have to plug off the water heater from the mains power supply and then plug it on again Check the tank and the plumbing for any cracks and damages 1 2 Screen view II Water heater off Anode Low g i ie In this view the fields Condition of the anode protector and Messages from NHC 34 have the same meaning The time and date take the rest of the screen 1 3 Screen view II Settings Next start 17 1
10. ring the day the water heater switches to Low power mode It turns back to Smart control automatically on the next turning on of the heating element or if you change the work mode with the F button until you get to the Smart control mode again During the Smart control mode the water heater maintains lower temperature during the day to avoid unnecessary heat losses If there are some days when you need more hot water you can use the option for forced water heating Boost mode Turn this mode on by pressing and holding the A for more than 1 5 seconds In Boost mode the water will be heated to the set temperature for the Heating mode After that the water heater will switch back to Smart control If the current temperature of the water is higher than the set temperature the Boost mode won t activate NHC 34 User Manual ver 2 7 The Boost mode temporary makes the energy efficiency of the water heater worse 2 1 3 Heating with timers Anode Low on 22 00 Set 60 In this mode you can set a time interval when the heating of the water is allowed To do that you have to set the two timers from the menu Set On Off Time In this mode the heating element turns on if the current time belongs to any of the two intervals and if the temperature of the water is below the set temperature For example you can use this mode if you use all the hot water in the morning but you also need some in the evening In this case you ca
11. s to display the energy consumption for the last 7 days by hours Order of the displayed information t v dq Set temperature Consumed energy on daily rate WOOF kwh Press and hold the Enter button for more than 3 seconds to reset this value amam Consumed energy on night rate UIDI kih Press and hold the Enter button for more than 3 seconds to reset this value A diagram of the consumed energy for the current day by hours The horizontal axis are the hours from 00 to 23 and the vertical is the of the consumed energy out of the maximum possible power of the heating element This view stays on the screen only for 20 seconds NHC 34 User Manual ver 2 7 A diagram of the consumed energy for the previous day by hours This view stays on the screen only for 20 seconds 00 O06 12 16 h 0033 kwh 16 28 A diagram of the total energy consumption for the last 7 days This view stays on the screen only for 20 seconds D D Start time of the daily energy rate Keep this parameter correctly set Start time of the night energy rate Keep this parameter correctly set Current date in format DD MM YYYY Start time of Timer 1 End time of Timer 1 Start time of Timer 2 End time of Timer 2 2 5 Initial settings of the water heater The temperature regulators NHC 34 are designed for different types of boilers Usually the manufac
12. turer doesn t make the necessary customization and therefore it is required to enter some information about the volume of the water heater the power of its heating element and whether it has an anode protection 1f the water heater is made of stainless steel it doesn t have an anode protection By default the set parameters are for a water heater type 72268EN 80 liters 3kW with anode protection If your water heater s parameters are the same you don t have to make any additional customization While the water heater is off Screen View II press and hold the F and the Enter buttons at the same time for more than 4 seconds to enter the Initial settings The first screen shows the version of the controller and the software NHC 34 User Manual ver 2 7 Press the F button again to enter the settings Setting Vol 80 a Anode To change the initial settings follow these instructions e the field that is currently selected blinks e the Enter button selects the next editable field e change the value with any of the buttons A or VW press the F button to save the changes and to go back to Screen View II 1 Turning the water heater off from the mains power supply doesn t change its settings about the temperature or the work mode 2 If the temperature of the water gets below 3 C and the water heater is off Screen View II the heating element will turn on automatically to prevent the freezing of the wat
13. wer than the set temperature When it reaches the set temperature the heating element turns off There are no other conditions that affect the heating 2 1 2 Smart Control Anode Low Lr Smart control t 60 13 12 A specially developed energy saving algorithm controls the heating in this mode Thus you have hot water whenever you need it on the lowest possible price We recommend this work mode if your consumption of hot water during the day is more than your water heater s volume In this case the water heated during the night won t be enough and you would have to leave the water heater always on In Smart control mode the water heater s work depends on your usual consumption of hot water and it doesn t turn on if you won t need hot water soon Moreover it will try to use the maximum of the night rate for the electricity To reach the maximum efficiency of this mode turn on the water heater and leave it on for at least two days without switching to any of the other work modes This mode doesn t use the set temperature to control the heating because the regulator determines it by itself The buttons amp and YW don t change the set temperature If you turn on the water heater for the first time or if it hasn t been used for a long time we recommend to use the Heating mode first until it gets to the set temperature and switch to Smart control mode after that If the electricity consumption is very low du
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