Overview of electric boilers Evan

Selection Guide

Why do people choose these devices? Obviously, it's all about the advantages over gas and wood counterparts.

Advantages of an electric heating system:

• There is no need to install a chimney to remove combustion products, to connect additional ventilation. Accordingly, there are no restrictions on installation and coordination with housing and communal services.
• Ease of control and programming modes. Devices for heating allow you to set the required temperature of the coolant or air on an external sensor.
• Opportunity to use a differentiated tariff scale. That is, during the day the cost of electricity is more expensive, at night, when the peak of consumption passes, it is cheaper by 40-60%. If thermal accumulators are purchased as a set for the boiler, it will save money by storing heat at night and spending it during the day.
• Safety. The risk of system boiling and explosion is reduced to zero.

Heating a house with an electric boiler has the following disadvantages:

• High cost of electricity.
• Constant power surges disable automation.As a result, rapid defrosting and damage to the entire heating structure.

We list the main parameters and technical characteristics of boilers for heating systems, on which the choice depends:

• Manufacturer. It is better to consider products of famous brands. Concerns have an extensive network of service centers that will provide fast and high-quality repairs.
• Power. Before you go to the store, do not forget to correctly calculate it in accordance with the level of heat loss at home.
• Efficiency - not less than 95%. Electricity is the most expensive fuel, so performance must be maximized.
• Security group. Mandatory: limiting the temperature of the thermal carrier (up to +85 ºC), protection against overheating, dry running, pressure sensors and others.
• The number of contours. Single-circuit boilers should be used strictly for their intended purpose, and for hot water supply, purchase separate storage boilers or indirect heating.
• Optional equipment. A heat accumulator, a stabilizer must be included in the piping of a high-power boiler, and if electricity is often cut off in the area, then generators running on diesel or gasoline fuel. The risk of failure of the heating system is reduced to zero.

To paraphrase well-known authors, we can say that electric boilers are not a luxury, but a means of heating in the harsh Russian winter.

Evan Warmos-IV 21

Electric heating boilers Class "COMFORT" Evan WARMOS IV - 21

Evan WARMOS-IV is a new generation electric heating boiler of the WARMOS family. What makes it different from its predecessors? Extended temperature range Evan WARMOS-IV operates in an extended range from +5 to +85°C. Thanks to this, you can additionally use it in such modes as: “Warm floor” and “Anti-freeze”:

• In the "Warm floor" mode, WARMOS-IV is directly connected to the floor heating system.
• In the “Anti-freeze” mode, the boiler saves energy by operating from +5 to +15°C. This is convenient when people leave the room for a long time.

New design and indicators The design of the new Evan WARMOS is complemented by an improved control panel with LED indication. Bright indicators show power levels, coolant temperature. In this case, when the boiler is started at a negative temperature, a special value is displayed: “-0”. The “Boiler control by room air temperature” mode is displayed on the indicator by flashing a dot. Indication of emergencies is provided. Ease of operation and maintenance of the boiler Evan WARMOS-IV 21 cares about your convenience and safety. In the event of an emergency situation, codes are displayed on the panel that signal if:

• there was a break in the thermal sensor for controlling the temperature of the coolant (code E1);
• a short circuit of the temperature control temperature sensor (E2) has occurred;
• the coolant has warmed up above + 84 ° C (E3);
• the heating medium has warmed up above +90°C (FF).

Additional safety is provided by an independent emergency shutdown circuit. You can easily set the desired coolant temperature from +5 to +85 ° C with an accuracy of 1 degree. The choice of power steps occurs automatically - the boiler itself determines the optimal number of steps. At the same time, the possibility of manual power control remains.In addition, Evan WARMOS-IV 21 has all the advantages that are typical for other models of EVAN electric boilers: resistance to electrical surges, the ability to use water and non-freezing liquids as a heat carrier, the option of time delay turning on and off power levels, reliable stainless steel heating elements manufactured by Backer with rotation of them at each inclusion and so on.

• The possibility of using both water and non-freezing liquids as a heat carrier.
• Heating elements from stainless steel of production Backer.
• Circuit of independent emergency shutdown.
• Setting the temperature of the heat carrier with an accuracy of 1 degree, in the range from +5 to +85°C.
• The expansion of the temperature range from +5 to +85 °C makes it possible to use the boiler in the following modes: "warm floor" and "anti-freeze".
• The possibility of limiting the power of the boiler. Three stages - each stage is 1/3 of the boiler power.
• Time delay for turning on/off the power steps.
• Automatic selection of the required number of steps to control the set temperature of the coolant (thanks to the replacement of the mechanical thermostat with a temperature sensor with an electronic thermal control system).
• Light indicators that display all the necessary information - display the current temperature in the range from 0 to +90 ° C.
• When the boiler is started at temperatures below 0 (the case with a non-freezing liquid in the system), the boiler's operability is maintained, the indicator displays "-0".
• The “Boiler control by room air temperature” mode is displayed on the indicator by flashing a dot.
• Rotation of the heating element each time the boiler is switched on in the "heating" mode.
• Block for connecting the circulation pump and air temperature sensor.
• Guaranteed operation of the device when the mains voltage deviates +/-10% from the nominal value of the network.
• Alarm code indication

1 - boiler 2 - inlet pipe G 1¼ 3 - outlet pipe G 1¼ 4 - heating element with stainless steel pipes 5 - rear panel 6 - screw clamp 7 - power cable and clamp for protective conductor PE 8 - screw clamp for connecting the circulation pump and air temperature sensor 9 - contactor for emergency shutdown of the heating element (for W-7.5-12) 10 - control unit with membrane keyboard and cable 11 - fuse for the circulation pump connection circuit 12 - membrane keyboard and cable

History of formation

This domestic manufacturer has been known in the heating equipment market since 1996. It was then that ZAO Evan was organized, the basis of production for which was the use of progressive schemes.

Today the company offers the consumer a wide range of heating equipment, including electric boilers. In 2008, the company was included in the NIBE Energy System. This is one of the divisions of the concern, which is a leader in the field of heating technology in Europe. It includes about 55 enterprises whose products are known for their quality and reliability.

The products of CJSC Evan were highly appreciated by a large number of diplomas and certificates of specialized exhibitions in Russia and Europe. Today the company has a network of representative offices in all regions of the country, as well as abroad.

EVAN Warmos - heating element relays do not work

Control board MK4573.1103(04) for heating boiler EVAN Warmos.

Introduction.Any non-core repair always makes the engineer feel like a toothache, you need to treat it, but you cannot cure it yourself. Therefore, when the payment from the EVAN Warmos heating boiler came in for repairs, the repairs were transferred from one engineer to another, and as a result, the engineer on duty got it. As expected, the repair itself turned out to be simple, but the time spent on studying this device took almost the entire duty (from 18-00 to 23-00), of course, with a distraction for big smoke breaks and chatter on the phone. Malfunction according to the customer. Heating element relays not working. Primary diagnosis. Since the on-site line mechanic identified the relay as faulty, and the relays looked like relays with a UPS, repairs automatically fell to our department. The soldered relay turned out to be absolutely serviceable, so it was necessary to prove the incorrect diagnosis to the line mechanic, the situation was complicated by the fact that this same mechanic started the heaters bypassing the board through the thermostat, which means that the board was inoperable. On the other hand, the presence of only one board without strapping and repair experience made such repairs akin to looking for a needle in a haystack. The board turned out to be “dead”, that is, discontinued and not supported by the manufacturer. Since the relays did not work, the suspicion fell on the relay control circuit. An external examination revealed a defect in the soldering of all 4.7 kΩ resistors in the resistor control circuits.

All 4.7k resistors had a soldering defect, it is not very visible from below, but there the picture is the same as above.

Repair.As expected, the soldering of 4.7 kΩ resistors (R4, R20, R27, R33, R38) did not solve anything, since it is impossible to start the heater relay without a concept of the mechanism of operation. I had to take a pencil and a sheet of paper, as it turned out later in vain, the relays were controlled from the outputs of the microcontroller and it was easier to search by the name of the board MK4573.1103 (04). With the help of google search, we find two documents that complement each other well and allow you to launch the repaired board in a workshop without strapping.

the inscriptions are hard to read and

currently installed in EVAN Warmos heating boilers (does not correspond to the diagram under consideration, but it gives an understanding of the purpose of the contacts in the previous diagram).

After a short experiment, it turned out to check the relay K2, it is necessary to close the contacts X5.1, X5.13 to emulate the operation of the thermostat and the contacts X5.10, X5.7 to emulate the inclusion of the first stage of the heater.

Switching circuit of relay K2, it is not necessary to install the LED.

Unfortunately, they did not catch the logic of the heaters, since when the control unit MK4573.1103 (04) is turned on with the 1st stage key pressed, all three relays are triggered in turn, stopping at relay K2. When contacts X1 (air sensor) or X2 (emergency sensor) are closed, the closed relay K2 opens, regardless of the switched on switch of the 1st stage of heating. The diagnostics is completed, the board is in good condition, the binding elements connected to the connectors X1, X2 are faulty, which are in a closed state, which causes the control board not to turn on the heater contactor relay. Conclusion. After the repair, sketches of the scheme remained, it’s a pity to throw them away, but there is no need for them, they may be useful to other specialists, they turned out to be unnecessary for us.

Sketches of the circuit for switching on the relay K2.

UPD 12/30/2015. As expected, the control board turned out to be serviceable, the problem was in the harness. When disconnecting all connectors X1, X2, X3, the board started working, so when sending the board for repair, you should disconnect these connectors and check the control board is working.

Electric boilers Evan EXPERT security system:

One of the central tasks set before the engineers of the Evan company was to design the Expert electric boiler with maximum safety parameters. Starting with the simplest - overheating of the coolant.

If, for some reason, the heating temperature reaches 92 ± 3 °C, then the overheating alarm sensor will work, which will lead to the boiler shutdown. By the way, such a sensor is built into all Evan electric boilers. In addition, it is self-returning, so when the boiler cools down to an acceptable value, the device will start working again.

The Expert electric boiler is equipped with a sensor that controls the range of allowable pressure; if the values ​​go beyond the set limit, the device stops working. Additional protection against overpressure, which may arise from excessive expansion of the coolant and which the expansion tank can no longer cope with, is provided by a safety valve. If necessary, the valve discharges excess coolant.

If suddenly, the pressure sensor or the working temperature sensor fails, the device will also block its activity. If the failure was short-term, then the boiler will restore its working capacity on its own. The independence of the EXPERT electric boiler is determined, among other things, by monitoring the presence of phases. For example, if one phase fails, the device will continue to work on the remaining two.

Electric boiler Evan EXPERT phase loss:

If the second phase also disappears, the boiler will not stop and will continue to operate, eating from one phase. But that's not all! When the power is restored and the phases return, the Evan electric boiler will analyze which relays and heating elements were idle and “force” them to work out the missed time. Thus, the resource of the relay and heating elements will be equal.

Another element of the security system is an automatic air vent. Its task is to bleed excess air from the system, preventing the formation of air pockets. Of course, we know that all Evan electric boilers are able to withstand voltage fluctuations. For Evan EXPERT, this range is a record 160 to 260 volts.

Of course, in the event of a complete absence of electricity in the network, the unit will turn off. But when the voltage is restored, the device will reach operating parameters on its own, without human intervention. It remains to be added that from a banal short circuit, the Evan electric boiler protects the circuit breaker from the company DEKraft.

In a word, the Electric boiler Evan EXPERT of the Lux series was designed by the company's engineers so that in any emergency it changes the mode of operation in such a way as to minimize possible negative consequences. As for navigating through the menu of the EVAN EXPERT electric boiler, we suggest you watch a video that describes in detail each purpose and the consequences of pressing the control buttons:

Power levels of the electric boiler Evan EXPERT

Possible malfunctions of the Evan EXPERT electric boiler and their elimination are shown in the table below:

Video review: Electric boiler with intelligence EVAN EXPERT watch video.

Evan range of boilers

Many consumers are concerned about the question of how much an electric boiler costs and what models the manufacturer produces.

Each of the models has its own distinctive features. And this concerns not only the design, but also the cost. In this regard, all Evan units can be divided into three classes: economy, standard and luxury.

Evan economy

Budget electric boilers for home heating Evan are equipped with heating elements, which are made of high-strength, stainless steel. This greatly extends the life of the equipment. The boiler and control panel are not combined into a single unit. The units are suitable for space heating up to 300 sq.m. The economy class includes devices EPO 2.5 and EPO 30. They cost 7,500 and 24,000 rubles, respectively.

Evan standard

But the Evan C1 electric boiler belongs to the standard class. The device has a power range of 3-30 kW. Boilers are designed for heating small houses: up to 300 sq.m. The control panel and a copper represent a monoblock. It is possible to connect a circulation pump. The Evan C1-30 model costs about 27,000 rubles. There is also a cheaper option: Evan C1-3, the price of which is about 8,000 rubles.

evan suite

The luxury class includes electric heating boilers Evan WARMOS-QX. The devices of this series are distinguished by wide functionality and are a mini boiler room. There is a pressure gauge that allows you to control the pressure in the system.The device is equipped with a microprocessor controller, which makes the process of changing power levels smooth.

There is also a programmer that allows you to set a mode in which the room will constantly maintain the optimum temperature level. All information about the operation of the device is displayed on a liquid crystal display. The protection system is multilevel. Models of this class include WARMOS-QX-7.5 and WARMOS-QX-27, the cost of which is in the range of 30,000-40,000 rubles.

Thus, the price of the Evan electric boiler is affordable. Since the manufacturer has developed models for all categories of consumers. There are both budget, simple options, and expensive boilers with many additional options.