Working pressure in the heating system causes the fall and growth

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Content of

  • 1 System pressure drops
  • 2 Determination of heat carrier leakage
  • 3 Pressure drop related to boiler equipment failure
  • 4 System pressure exceeds recommended threshold

Modern gas boilers and pragmatic aspiration of heat power engineering to progressive heating solutions in private home ownership, apartments increasingly lead to useclosed heating systems with forced circulation of the coolant. The closed contour of the fluid cycle makes it possible to increase the operating pressure of the system and thereby increase its safety. It is known that as the pressure in the liquid medium increases, the temperature of its boiling rises. In particular, the following relationships are typical for water: 1 atm.- 100 degrees, and 2 atm.- 120 degrees.

The monitoring of the liquid filling state of the system is carried out by measuring devices. First of all, gas boilers equipped with a circulation pump and safety group assume the presence of a mechanical dial or electronic display reflecting the temperature and pressure sensors located at the boiler outlet( feed).Additional manometers are installed on distribution manifolds, which are responsible for supplying the coolant to various parts( floors) of the building. Without indications of auxiliary pressure gauges, systems involving boilers of indirect or combined water heating, as well as complex systems using a high-temperature circuit - radiator heating and low-temperature - warm floors are not bypassed.

Pressure in the system falls

Let's name the reasons that answer the question, why the pressure in the heating system drops, and we will offer the ways of their elimination. So, the reason for the negative phenomenon are:

  • unauthorized leakage of the coolant in the places of connection of the nozzles to the heating devices or directly the rush of the main pipelines, violation of the tightness of the pipes in the warm floors;
  • failure of the direct heating unit, caused by the formation of microcracks in the body of the heat exchanger;
  • breakdown of a membrane-type subversion valve, part of the boiler equipment safety group;
  • rupture of the membrane in the expansion tank, designed to compensate for the linear expansion of the coolant as its temperature increases;
  • depressurization of the hot water supply( DHW) circuit in the bithermal version of the generating heat installation, hence the pressure in the double-circuit boiler drops during intensive parsing of hot water and sharply increases upon its termination.
Tank Pressure Table

Pressure table in the tank

Determination of the leakage of the coolant

The leakage is initially determined visually, for this, as a rule, the system is fed up to the recommended level and stops the forced circulation of the liquid. Particular attention is drawn to the shut-off and control valves installed on the radiators of heating, their direct connection to the main pipes. If it is not possible to determine on its own why the pressure loss in the heating system is dictated, then specialists are recruited. With the help of air pressure, more intensive release of the coolant in the leakage areas is achieved. Sometimes, for elimination, you simply need to repack the connection or replace the defective fitting. A more complex device requires the definition of a rush in pipes hidden in a wall or in "snails" of a warm watered floor. For this purpose, special scanners are used that determine the concentration of excess moisture with high accuracy. Then the matter of technology: the dismantling of the decor of the surfaces of the wall or floor, the removal of the damaged area and its replacement. Ways to eliminate heat in the heating.

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Pressure drops related to boiler equipment faults

If it is determined that the pressure in the gas boiler is falling, only the employees of the service organization, on whose balance the heating unit is located, are engaged in the elimination of malfunctions, as a high-risk device. Qualified personnel of the service center will offer several solutions to the problem: to solder or replace the whole heat exchanger. Everything will depend on the nature of the damage that has occurred as a result of regular washing of the thermal "shirt" of the boiler from scale, a factory hidden defect or ordinary operational wear. After the specialists carry out the work, appropriate records are made about the guarantee or post-warranty repair. Having determined that the pressure in the double-circuit boiler drops due to damage to the rubber membrane of the expansion tank, it is necessary to replace the damaged product with a new tank, so as not to subject the entire heating system to additional risks that will arise after the system is recharged to the established level. The liquid, having lost the possibility of linear expansion, will cause the pressure in the circuit to increase rapidly, causing frequent trips of the safety valve. Damage to the diaphragm( EPDM) in the safety valve leads to the activation of the protective function of the device even in cases where the maximum pressure in the heating system has not been reached, which requires an emergency discharge of excess fluid from the circuit.

Pressure in the heating system

Heating system pressure

System pressure exceeds the recommended threshold

The fact that the pressure in the heating system is rising indicates that there is one of the reasons listed in this list. So:

  • the fall is observed in a certain section of the circuit - the circulation is stopped after the regulating devices;
  • the system is continuously fed;
  • shut-off valves cut off entire contours or sections of main pipelines;
  • obstacle, making it impossible for the coolant circulation in the system due to the critical accumulation of air masses;
  • mechanical clogging of installed in the heating circuit systems and devices for fluid filtration.

Troubleshooting is associated with a sequential examination of the entire heating circuit of the rooms. As a result of oversights, unauthorized intervention of curious children, it may be the closure of valves, latches, ball valves. It can also be affected by switching off the adjustment devices from the electrical network( servo motors for collectors or thermoregulating three-position valves when connecting DHW circuits in a combined boiler).They resort to preventive washing of the mesh of mechanical filters. Special attention is paid to self-cleaning filters, which are necessarily installed on old heating systems, where cast iron radiators and metal pipes of large cross-section are used. They make a pressurization of the heating system, and if necessary, replace the device for automatic air release, repair the crane responsible for replenishing the heating circuit in the boiler.

Thus, by constantly maintaining the operating pressure in the heating system of 1.5-2 atm., We can effectively and safely use the boiler equipment, we achieve the optimal physical load for appliances and heating pipelines, thereby increasing the time of their trouble-free operation.

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