Faced with repair work, going on a long trip or becoming a victim of an accident, many are wondering if it is necessary to drain the water from the heating system? In most cases, the answer is yes, although there are situations where you can fix the problem or make repairs with radiators filled with liquid.
Although the drain procedure is not particularly complicated, compliance with the operating rules is an important nuance. If you violate the procedure, you can flood the floors in your own house with water. And if the drain is carried out in a multi-storey building, then neighbors may also suffer from incorrect actions.
Why is it necessary to drain water from heating systems?
Draining the heating system is necessary in the following cases:
- when it is necessary to eliminate leaks in pipes;
- if old radiators are replaced with more modern models;
- when preventive measures are taken to clean the system from accumulated contaminants;
- if you need to replace the coolant.
With filled cavities of batteries and pipes, these works cannot be performed. Water is drained in the event of an emergency or at the moment when the owners of the dwellings intend to leave the premises for a long time.
Features of the design of the drain of the heating system
The heating system of an apartment building and a private house has significant differences. Heating in cottages occurs through an autonomous system, which includes a boiler, pipelines, valves and directly radiators, and sometimes an installed system of underfloor heating.
In multi-storey buildings, the main structural elements are the supply and return risers, the internal piping system, shut-off valves, drain cocks and the batteries themselves. In this regard, the discharge of water from the heating system will be somewhat different for both systems, although the principle of operation is the same.
How to properly drain the heating system?
Having dealt with the main elements of the heating structure, you can begin to empty it. How to properly drain the heating system in private and apartment buildings?
Drainage in a private house
For the drain procedure, the owner of the cottage will have to prepare a hose in advance, through which the liquid released from the system will flow. One end of the hose is connected to the boiler tap, the other is sent to the most convenient place for the owner of the house, where it is possible to empty the structure without damage (on the ground of a personal plot, sewerage).
The sequence of actions for draining water:
- The boiler is turned off, its work stops.
- A hose is put on the boiler return valve (usually the outlet pipe is located on the right side under the boiler), so emptying is faster. If the crane is not under the structure, refer to the autonomous system diagram and find out its location. The reverse part of the hose is sent to the sewer drain, front garden or regular bucket.
- Open the valve and wait until the liquid stops flowing (the pressure in the system decreases during this period), the valve is closed back.
- After draining, you need to take care of the access of air to the cavity of the structure. To do this, it is necessary to open the so-called Mayevsky crane, which is usually located at the highest point of the autonomous system. For example, on a heated towel rail or one of the radiators (if the cottage is two-story, then Mayevsky’s tap will be on the battery of the 2nd floor).
- The air will begin to push out the remaining water from the batteries and the boiler, so the drain must be carried out again.
- Now, when there is practically no liquid left in the system, its insignificant remnants are “blown out” by opening all the Mayevsky taps in the structure, and the next drain of water is carried out.
- Now the end of the hose attached to the return pipe is removed from it and attached to the supply valve.
- The final draining of the liquid from the heating system is carried out. To achieve maximum emptying, it is necessary to install the hose as low as possible in relation to the outlet cocks.
However, if the owner of a private house has an underfloor heating system, then the above scheme will not help him. To dump liquid from it, you will need to use a special compressor.
Drainage in an apartment building
Draining the heating system in a multi-storey building is more difficult in part because it is necessary to obtain permission from the local management company to drain the riser. This service is paid, and the date will be set not by the owner of the apartment, but by the employees of the housing and communal services, which may cause some inconvenience.
It is better to plan work on repairing the heating system at the end of spring — summer — beginning of autumn, since during the heating period it is possible to drain the liquid only for a few hours and for a high fee.
However, it is possible to replace the battery or carry out minor repairs without emptying the entire heating structure. Most radiators are equipped with valves, with which you can block the flow of coolant to a local area.
- The valve is closed to shut off the water supply to the radiators.
- Using an adjustable wrench, the plug is removed or, if available, the outlet cock is opened. The liquid is drained into a basin or bucket.
- If there are no outlets, you will have to disconnect the battery completely and get rid of the coolant through the top.
If a more serious repair is required than a regular radiator change, then you need to drain the riser. This procedure is performed by the employees of the management company as follows:
- The valve in the attic or ceiling of the upper floor is closed.
- Close the valve in the basement or basement.
- The plug is removed or drain valves are opened, the coolant is discharged from the system.
As you can see, the procedure for getting rid of the coolant from the system has significant differences for houses of different types.