The storage electric water heater consists of the following elements:
The thermostat, like the heating element, are important components electric water heaters. The heating element heats the water, and the thermostat is responsible for maintaining, adjusting and heating the water to required temperature. In addition, it is also responsible for the safety of the device, since it turns off the heating element when the water temperature becomes critical and steam begins to form.
Typically used in water heaters the following types thermostats:
The operating principle of the capillary thermostat is pneumatic. The pressure inside the gas flask in which the thermostat is enclosed varies depending on the temperature. The change in pressure is transmitted to electrical contacts through a pneumatic relay along the capillary.
An electronic safety and control thermostat is a more expensive thermostat for a water heater. The water temperature in the boiler is inversely proportional to the resistance of the electronic sensor. It is by this principle that the temperature of the water heater is controlled and adjusted.
Briefly, the operating principle of any thermostat can be formulated as follows:
Such elements are a thin tube of copper or steel with a high-resistance metal wire and magnesium oxide inside for electrical insulation. It is mounted in the same flange where the thermostat for the water heater and the anode (magnesium) are located. Submersible elements reliably protected from water ingress, and their operating temperature reaches 300-400 degrees. Heating elements are distinguished by shape, power, size. The elements are connected to one or three phases.
Advantages of submersible elements:
The design of the element is similar to the submersible type, with the only difference being that the body of such a heating element is made of refractory ceramic tubes. Mounted ceramic heating elements in an enamel housing with a thermostat and anode.
The advantages of such elements:
One of the most important parts for a water heater is the thermostat. It is the thermostat for the water heater that maintains constant temperature water, protects against overheating, and, if necessary, performs operations to turn the water heater off and on. It is the thermostat that makes it possible to set temperatures and maintain automatic modes.
Every water heater thermostat works on the same principle, regardless of the manufacturer. The thermostat is equipped screw design , at which the temperature required by the user is set. After tightening the shut-off valve, cold and hot water begins to flow into the water heater, after which the adjustment processes begin to work.
For getting desired temperature in a water heater has an advantage hot water. It continues until it reaches specified parameters, only under this condition does mixing with cold begin. Depending on the type of water heater - instantaneous or storage, the power of the heating element is selected. Most often, it is in flow heaters it has great power.
When selecting a heater or additional installation thermostat, it should be remembered that on heating tank and the thermostat itself has different warranty conditions. This is due to the fact that many skillful water heater owners, when different types in case of breakdowns they take care of do-it-yourself repair. Most frequent breakdowns thermostat:
If you need to replace a thermostat for a water heater, you need to know what types exist:
The thermostat for a water heater is precisely the part that is the basis for the entire functioning of the boiler. With correctly selected technical specifications and compliance with all operating conditions, the water heater will last a long time without cleaning or breakdowns.
The thermostat for a water heater is a fairly important part. It is he who is responsible for maintaining a certain temperature at a constant level. The thermostat for the water heater is capable of slowly adjusting the temperature, and it is also equipped with a device that protects it from cooling and overheating. When the need arises, he turns the type on and off, that is, the heating element.
This device allows the user to set a specific operating mode and also maintains the temperature level in automatic mode. If the water temperature decreases, it turns on the heating element, due to which the temperature rises to a certain specified level.
The thermostat for a water heater has a certain operating principle. It is worth saying that it is similar for all types of water heaters. On the screw with which each thermostat is equipped, a certain required water temperature is set. When the swelling valve is tightened, hot and cold water begins to flow into the mixer system, and then the adjustment process begins. The temperature of the water is measured in the chamber, after which warm water is mixed with cold water in the required proportions. When supplying water for mixing, hot water has priority, so it will be supplied until its temperature is higher than the set value. After this, the process of mixing it with cold water. Thanks to this fact, it can be explained that the thermostat for the water heater does not respond so quickly. However, the user usually does not experience any particular inconvenience.
If the thermostat for the water heater is installed in a system where there is no circulation warm water, then it is possible to hit cold water into the incoming stream initial stage. In systems where there is circulation of warm water, the thermostat adjusts the required temperature in an instant.
Storage and flow units are usually equipped with different heating elements. Usually heating elements flow models have more high power. That is why the choice should be made only after you have decided on its purpose.
An electric thermostat may have normally closed or normally open bakelite. Often, water heater owners decide to repair it themselves. The thermostat for the water heater "Ariston" and other companies is electrical part, so it’s worth remembering that different warranties are given for the tank itself and for it. If you need to replace any element of the water heater or have it repaired, you should contact service center or directly to the manufacturer, where you can find out whether it is subject to warranty repair. It is important that the appropriate thermostat model is available.
If you are wondering where you can purchase this device when yours is out of order, it is worth noting that most companies involved in the production of such equipment provide delivery throughout the country. For example, you can order a thermostat for a Thermex water heater at home. It is easy to replace it yourself using simple recommendations.
2016-12-14 Evgeniy Fomenko
The first stage of repair is to disconnect the water heater from the electrical network, then drain the water, and remove the heating element from the water heater. Remove the thermostat from the heating element by carefully pulling it out. Drill out the copper rivets holding the body together, disconnect the body from the rod, this must be done carefully so as not to damage anything.
There are two methods for cleaning bimetallic plates: if the contamination (oxidation) is not very strong, try cleaning it with a cloth soaked in alcohol, inserting a piece between the plates and wiping; if such cleaning does not produce results, clean the plates with the finest grit sandpaper. It’s even better if it’s already used, so as not to break contacts.
The breaker contact (rocker) may have stuck to the housing. To fix this problem, disconnect the contacts and clean the area. The break contact should return to the upper position automatically.
If this does not happen, remove the “rocker” from the device and clean it using a fine abrasive sandpaper, clean the place where it is installed (perhaps melted plastic has stuck there), and install it in its original place. If the “rocker” still does not return to its original place, glue a piece of insulating tape under it, selecting such a thickness so that the contact plate returns to the upper position.
Insert the rod back, tighten the housing using self-tapping screws, and insert it back into the heating element.
In addition to those described above, there are the following possible malfunctions thermostat, which can only be eliminated by replacing it:
If you find that your device has stopped working, there are ways to check the problem yourself. To check the operation of the thermostat for the water heater, you will need to remove the thermostat and set it in resistance change mode. We set the maximum possible temperature, measure the resistance in the input and output contacts of the device.
If the device shows infinite resistance, you can safely conclude that it is faulty. And if there is resistance, then turn the regulator to the highest small value and reconnect the contact tester. Next, using a lighter or candle, we heat the tube of the device; if the device is working properly, the relay will operate, which closes the circuit, and the resistance indicator will increase. If this does not happen, the device is faulty.
If you cannot repair the thermostat, in order to select a suitable device, you should follow the following recommendations. The most the right decision will be purchasing the same device, from the same manufacturer.
However, if you haven’t found it, when choosing, pay attention to its dimensions, the method of attachment to the water heater, the number of functions performed (only temperature control, or also protective), and the voltage for which it is designed. When you go shopping for a new one, do not forget to take the technical passport for the boiler, or a failed device.
Video about the thermostat design:
