What is the nominal pressure in a gas boiler

What is the nominal pressure in the boiler? This is the indicator declared by the manufacturer at which the equipment works properly. It is important to know and follow the changes in values ​​during the operation of the equipment. Strong surges can lead to equipment failure and an emergency.

Let’s figure out how to properly monitor and maintain the boiler’s performance.

What should be the normal pressure in a gas boiler

The value may differ for each brand and model of equipment. The exact figures can be found in the passport data. The average gas pressure depends on the design of the boiler:

The “minimum” column indicates the indicator below which the boiler will not work. In this case, the protective automation will turn it off to avoid a serious breakdown or accident.

In a European type gas supply system, the nominal value is 20 mbar, while in our regions it is 12–18 mbar. Consumption depends on the type of fuel consumed: liquefied or main.

In addition, there are other types of pressure – water and atmospheric. Water is indicated by the unit Pa. Until it is filled with water, the system maintains an atmospheric value of 1 bar.

Values ​​in the expansion tank and heating system

The expansion tank is used to collect excess fluid. During heating, the liquid expands, which leads to an increase in values ​​u1,5buXNUMXb(norm XNUMX bar). To avoid breakdowns, the excess is taken into the tank, and after cooling it is returned to the system again.

A pressure gauge is installed to measure the pressure. When a change occurs, the gauge needle points to the minimum or maximum allowable value. To change the situation, air injection is carried out using a nipple.

To properly install the tank, proceed as follows:

• Find out the rating for your model. The setting in the expansion tank must be 0,3 bar lower than in the heating circuit.
• Set these values ​​before connecting the tank.
• After connecting, fill the circuit with liquid. Watch for changes on the gauge. As soon as they reach the norm, turn off the water supply.
• Start the pump.
• Set the thermostat to the highest temperature. This is done so that the liquid expands as much as possible and fills the expansion tank.

The higher the speed of the circulation pump, the faster the coolant moves through the system. Therefore, the thrust force is greater. There are no specific indications of the nominal pressure in the circuit. It is believed that the difference in the pressure force in the inlet and return pipes should not exceed 0,3–0,5 atm.

How to measure readings in a double-circuit boiler? For this, a manometer is also used.

Why is the pressure dropping? Reasons for the plumbing system:

• Leak in pipe connections, heat exchanger. Inspection, sealing and replacement of faulty components will help to fix the problem.
• Three-way valve problems. Clean it of debris.
• Deterioration of the expansion tank membrane. In case of deformation and damage, a replacement is carried out.

Reasons for the gas line:

• A sharp increase in the load on the highway. This happens in extreme cold. It remains to wait for the restoration of the supply.
• Clogged filter, hose, nozzles. Cleaning is in progress.
• Gas valve failure. Perhaps the mechanism is jammed or the valve needs to be replaced.
• Leakage in pipes. If you smell gas, turn off the supply valve and call the emergency service.

Monitor the operation of the boiler and its indicators. Then it will be possible to avoid breakdowns and accidents.