For many novice plumbers there are many mysteries and mysteries. In this article I will try to explain how it will work with a servo drive of three different models. We will look at the operating logic and electrical connection diagram.
Option 1: Price from 6300 to 9200 rubles. There may be variants of articles.
Option 2: The price is about 2500-5000 rubles if you try to find it on a Chinese website and order it from China.
Option 3. An expensive option, but there are a lot of options. The price can be about 15-20 thousand rubles.
Connection diagram of a three-way valve with a servomotor for domestic hot water supply
The valve can be installed both on the supply line (supply) and on the return line of the pipeline (return).
Many will ask the question:- Where is it better? For supply or return?
In terms of DHW functionality, this is not important. But there are some nuances why it is necessary to put it on supply or return.
Nuances between supply and return:
Anyone Do any of you know why it is necessary to install a hydraulic accumulator on the return line of the pump? Or does he think it can be placed anywhere? Do you know why the pump is installed on supply or return? Answer: This is because the distribution of pressure in the air changes depending on where these elements are located. different points pipeline. And in some cases, the reason again becomes the convenience of filling and draining coolant in the heating system. It also helps to avoid airing and much more.
Why Does the boiler equipment manual recommend keeping the pressure at least 1.5 Bar? Because the pressure in the boiler heat exchanger cannot be reduced! A decrease in pressure leads to cavitation of the coolant in the heat exchanger. It also leads to early boiling of the coolant. And all this leads not only to a decrease in boiler power, but also to the deposition of scale in the heat exchangers, which leads to scale deposition and overgrowth of the heat exchangers. Which in turn will lead to a short service life of the boiler equipment.
Do you think, if the pressure gauge shows 1.5 Bar, this means that pressure less than 1.5 Bar cannot be present in the system at the same height. Where is the pressure gauge? Answer: This can happen and more often it happens to owners who independently figure out where the pump and hydraulic accumulator will be located. And they don’t understand how the pressure will be distributed after that.
Also how does a hydraulic accumulator affect pressure distribution: http://santeh-baza.ru/viewtopic.php?f=2&t=93
Why do you need a three-way valve for domestic hot water?
The main task of a three-way valve for domestic hot water is to redirect the movement of coolant from the heating system towards the Boiler indirect heating(another heat exchanger) and back in automatic mode.
As soon as the command comes to heat the indirect heating boiler, you need to redirect the coolant towards the BKN coil. The heating signal is generated by a special relay, which is located at the BKN (Indirect Heating Boiler). That is, the BKN has a built-in electric thermal relay, which provides a switching contact.
What does a three-way valve for domestic hot water look like?
Electrical diagram of the valve operation for the DHW boiler Thermona?
Electrical diagram with boiler and boiler
The servo drive has three contacts, one common. If you give a voltage of 220 Volts to two contacts (direction 1 + common), there will be one position. For another position, you need to give a voltage of 220 Volts to the other contact (Direction 2 + common). Phase and neutral of a 220 Volt network is not important.
Option 3. The most difficult option, which requires more detailed study. Has a variety of functionalities.
If you have a more efficient heating + hot water system with higher costs. It is not possible to use valves of options 1 and 2, since they have low capacity!
This device consists of two parts:
1. Rotary mixing valve (diameter optional)
Servo drive ESBE
Servo drive model: ESBE ARA641 for 220 Volts. 30 seconds. Article number 12101100
Drive characteristics:
1. Rotate 90 degrees. There is a degree adjustment setting. You can do a little more or move it a little to the side.
2. 3 point control. That is, 3 220 Volt contacts for control: Terminal 1, terminal 2 and common terminal.
3. The time it takes for the drive to rotate 90 degrees depends on the model. Model ARA641 30 sec.
4. Wire cable 1.5 meters.
5. Torque force: 6 Nm.
Servo drive electrical circuit: ESBE ARA641
This device has three conductors: Blue, brown and black.
Blue– common conductor, usually Zero is connected to it
Brown and black These are position 1 and 2 conductors.
When there is a voltage of 220 Volts on the blue and black drives, the drive rotates 90 degrees in one direction.
When there is a voltage of 220 Volts on the blue and brown drives, the drive turns 90 degrees in the other direction.
Such servos have a button to disable the direction of movement. That is, you can force the valve to the desired position during repairs or tests.
Please note that the larger the number, the more torque may be required.
In the ESBE catalog You can choose other valves and servos!
For example,
1. Select not three-point (three-contact) control, but two-point control. That is, a constant voltage goes to one contact, and you simply give or take away voltage to the second contact.
2. The rotation angle can be more than 90 degrees. For example, 180 degrees.
3. The closing time is not 30 seconds, but much longer. For example, you may need to smoothly transition up to 1200 seconds.
4. Take a drive with a different torque force.
5. Drive 24 or 220 volts.
6. You can choose not only for switching, but also for obtaining the desired temperature by mixing.
Download ESBE catalog for selection of valve and actuator: esbekatal.pdf
If someone has a two-point signal from an indirect heating boiler or from some thermostat that has only a two-point contact, then an electromagnetic switching relay can be used.
This model should be looked for in specialized electrical and electronics stores.
Model: ABB CR-P230AC2. 220 volts are supplied to pins 1 and 2. The load of the switching contacts must not exceed 8 amperes. 8 A x 220 Volts = 1700 W. Can withstand equipment up to 1700 W. Does not apply to pumps and incandescent lamps since the first start-up requires high currents.
In order to connect it to the wires, a special connector is used:
ABB CR-PLSx (logical) socket for CR-P relay
It should look like this:
That's all. Ask questions! Did you understand everything? Maybe something is missing?
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A series of video tutorials on a private home
Part 1. Where to drill a well?
Part 2. Construction of a water well
Part 3. Laying a pipeline from the well to the house
Part 4. Automatic water supply
Water supply
Water supply for a private home. Operating principle. Connection diagram
Self-priming surface pumps. Operating principle. Connection diagram
Self-priming pump calculation
Calculation of diameters from central water supply
Water supply pumping station
How to choose a pump for a well?
Setting up the pressure switch
Pressure switch electrical diagram
Operating principle of a hydraulic accumulator
Sewage slope per 1 meter SNIP
Heating schemes
Hydraulic calculation of a two-pipe heating system
Hydraulic calculation of a two-pipe associated heating system Tichelman loop
Hydraulic calculation of a single-pipe heating system
Hydraulic calculation of radial distribution of a heating system
Scheme with a heat pump and solid fuel boiler - operating logic
Three-way valve from valtec + thermal head with remote sensor
Why the heating radiator in an apartment building does not heat well
How to connect a boiler to a boiler? Connection options and diagrams
DHW recirculation. Operating principle and calculation
You are not calculating the hydraulic arrows and collectors correctly
Manual hydraulic heating calculation
Calculation of warm water floors and mixing units
Check valve design:
Check valve- type designed to prevent backflow. Check valves allow the flow of the working medium to pass in one direction and prevent its movement in the opposite direction, acting automatically and being a direct-acting valve.
By means of check valves it is protected various equipment, pipelines, pumps and pressure vessels, and it is also possible to significantly limit the flow of the working medium from the system in the event of destruction of its section.
Depending on the design and operating principle constipation organ, check valves can be divided into: lift, ball, hinged and axial, as well as rotary check valves.
The simplest in design and manufacturing technology - lift valves. The shut-off element in them is a spool, which moves back and forth in the direction of the flow of the working medium. In the absence of medium flow through the valve, the spool in the check valve is in the “closed” position under the influence of its own weight or spring, that is, the shut-off element is in the body seat. When a flow occurs, the spool, under the influence of its energy, opens a passage through the seat. If the flow changes direction, the spool returns to closed position and is additionally pressed by the pressure of the medium itself.
Lift valves are only installed on horizontal sections pipelines. A prerequisite is the vertical location of the valve axis. The main advantage of a check lift valve is the ability to repair without dismantling the entire valve. Disadvantage: high sensitivity to environmental pollution.
IN ball check valves the locking element is a ball element, and the pressing element is a spring. Ball check valves are usually used on small diameter pipelines, mainly in plumbing.
The most compact design among check valves - the axial and double-leaf flap valves. In a spring-loaded disc valve, the shutter is a disc with a pressure element - a spring. In working condition, the disc is pressed out under water pressure, ensuring free flow. When the pressure decreases, the spring presses the disk against the seat, blocking the flow hole. In complex hydraulic systems, double-leaf valves are used. In them, the locking disc is folded in half under the influence of water flow. The reverse flow returns the disc to its original state, pressing it against the seat. Size range 50 mm – 700 mm, even larger than spring disc valves.
The main advantages of wafer check valves are their smaller size and light weight. Their design does not have flanges for fastening to the pipeline. Due to this, the weight is reduced by 5 times, and the total length is 6-8 times compared to standard ones. check valves given bore diameter. Advantages: ease of installation and operation, the ability to install in addition to horizontal sections of the pipeline, also on inclined and vertical ones. Disadvantage: complete dismantling is required when repairing the valve.
Rotary check valves, or check valves are used for very large pipeline diameters. In this design, the locking element is a spool - a “flap”. The axis of rotation of the “flap” is located above through hole. Under the influence of pressure, the “flap” reclines and does not interfere with the passage of water. When the pressure drops below the permissible value, the spool falls and slams the passage channel. With a pipeline diameter of more than 400 mm, rotary check valves are equipped with special devices that make the flap fit smoother and softer on the seat. Hydraulic dampers and weights installed on the flap directly or using a lever are used as such devices. A significant disadvantage of shockless structures is the impossibility of installing them on any sections of the pipeline except horizontal ones. In general, check valves have a number of advantages over check valves, including less sensitivity to contaminated environments.
A three-way mixing valve is designed to mix two incoming flows (cold and hot) into one outgoing flow at a given temperature. These valves are especially in demand in household systems hot water supply to protect consumers from scalding. They can also provide hot water directly from instantaneous or storage water heaters or be used as a preliminary mixing stage. They are no less often used to maintain a stable supply temperature in underfloor heating systems.
Operating principle.
Internal regulation of the valves is carried out automatically due to the presence of a temperature-sensitive element that is in contact with the mixed flow and contracts or expands depending on the deviation of the mixture temperature from the set output value, thereby increasing or decreasing the inlet openings of the hot or cold water.
How does burn protection work?
Most thermostatic valves currently on the market have a temperature protection device - “scald protection”. In the event of an unexpected interruption in the supply of cold water to the valve, the supply is automatically shut off. hot water, thereby eliminating the possibility of supplying hot water to the consumer without prior mixing.
Direction of flows.
There are two schemes for directing flows in a thermostatic valve - symmetrical and asymmetrical. The choice of a specific scheme depends on the type of installation and ease of installation in a particular heating or hot water system. Let's take a closer look at each of them.
GW- hot water;
HV- cold water;
NE- mixed water.
Symmetrical T-shaped flow direction diagram
Cold and hot water are supplied from opposite sides, mixing occurs in the middle. This scheme very common in Europe due to the compactness of the valves.
Asymmetrical L - shaped flow direction diagram
Hot water is supplied from the side, cold water is supplied from the bottom. It became widespread due to the versatility and simplicity of the resulting mixing unit.
Examples appearance thermostatic valves with symmetrical and asymmetrical flow direction:
 |  |  |
Watts AquaMix (Germany) | Danfoss TVM-H (Denmark) |
It is thermostatic valves with an asymmetrical flow pattern that will be discussed further.
Application areas of thermostatic mixing three-way valves.
