The expansion tank in the heating system : installation of circuit closed and open

Theory

The name of the heating element of the system - expansion tank - says better explanation.The capacity required for such communication, pipes and other elements which are practically inelastic and are not able to change its volume in accordance with the needs of the system.And the need to be able to occasionally "lose steam" heating needs more than any other domestic communications.This arises from the fact that the water that circulates through the pipes expanding upon heating, which leads to a substantial increase in pressure which, in turn, is fraught with emergencies.Moreover, even if the system did not give up in the first season after the improper installation on the second and third communication certainly not survive.

ideal solution to the situation - the installation of a broad tank.The latter is a tank filled with easily compressible material - air - and can serve as practical to maintain a stable pressure.

device is extremely simple (which you can see in the image).To the inner part of pipe was not subject to corrosion due to oxygen in the tank, the membrane separates the air from the primary coolant.

Where the system is used with extension elements:

• in closed heating systems in private homes;
• open heating that contacts with atmospheric air;
• centralized heating with an upper filling method.

In addition to its core values, the tank allows you to get rid of air pockets.In the case of open-air self-driving system will be replaced in the tank, but for the need to open the closed valve and bleed it.

Where and how to assemble an expansion tank

Before starting construction activities, be sure to choose the right type and volume of the tank is suitable for your system.Be sure to find out those of its kind, because action scheme directly depends on this.

expansion tank in an open system

It's simple.It is important to understand that such heating is a specific vessel communicating with the original lines of convection heat transfer medium movements.Such a system should be fully installed with the priority of specific tasks.In particular:

• speed ascent of hot water to the highest point of the heating system plus Draining by gravity method in pipes and appliances;
• free movement of air bubbles up.

latter problem and determine where you want to install an expansion tank (the most common arrangement in the booster reservoir at the top if the one-pipe system).

This tank can be even easier to the above structure, it does not need any membrane or other additional elements.Even in such a case cover bears only one function - protection of the litter.If necessary, addition of water to the system due to evaporation, it may be carried out in conventional bucket tank.

Expansion tank in a closed system

properly designed closed communication is somewhat more complicated, but also really on their own.Therefore, experts advise:

• tank should be placed where the coolant for the laminar and the pipe does not have a strong gyri (optimally - accommodation before tsirkulyatsionnikom);
• mounting height does not matter;
• pitted excess air through the valves.

Here is a simple system of installation of the expansion tank in a closed heating system.

Most factory tanks are already equipped with safety valves that discharge if necessary excess pressure.However, when buying still make sure it is available, and if still your model is not equipped with them by acquiring separately and set it right next to the tank - heating security guarantees are not redundant.

should know that most modern gas and electric boilers with electronic thermostat and pre-equipped with a circulating pump and expansion vessel, and additional installation of these elements need not be.

important difference mounting the expansion vessel in a closed system to an open - its spatial orientation.The coolant must flow into the tank from above.Only in this way the air is removed from the water, if not completely, almost down to zero.

tank

Choosing the expansion tank for the house, consider the amount of coolant that circulates through the pipes.The calculation is simple: the tank should be at least 1/10 of the volume of water otbschego.And choose a larger model can be, but on the smaller is better not to look, if security plays a role for you.

The sheer volume of water is calculated like this: 15 liters of water per kilowatt power boiler.If you still have miscalculated with the volume (a sure sign - often relieves pressure valve) can be set beside another tank.

An additional advantage of the system will gauge mounted near the tank - so you'll always hold specific information, rather than speculate about the pressure state.