Stable pressure in the heating system is one of the main criteria for normal operation. If the values are higher or lower than specified, the equipment will not start. Why does the water pressure in a gas boiler jump? In the article you will find out the possible causes of the problem. Basic: leak, depressurization, blockage.
We will tell you how to adjust the indicators to restore the operation of the device.
System pressure
In empty pipes without a coolant, the indicators are stably 1 bar. As soon as you open the stopcocks and the coolant enters the circuit, the values increase to 3 bar (depending on the model). If the pressure gauge needle indicates less than 0.6 bar or more than 3 bar, the operation of the boiler is blocked. Until you eliminate the cause of the jumps, the technique will not start.
The power of the pressure is affected by the speed of the circulation pump, the cross-section of the pipes, the heating temperature, air supply and the presence of blockages. Each model of Arderia, "Baksi" has its own indicators. How much should be the working pressure indicated in the instructions.
There are such types of pressure:
- Static The greater the height of the pipes, the higher the value. Lifting per meter equals 0.1 bar.
- Dynamic. Forced fluid movement by the pump or expansion with increasing temperature.
- Working. Includes the two options described above.
- Excessive. It is fixed by a measuring device - a manometer.
- Rated. Depends on the type of construction, materials, production technology.
- The maximum. Permissible for normal operation.
- Pressure testing. High performance during testing in factories.
Why is pressure jumping
If you notice a slow decline, check leak heat exchanger. Microcracks appear as a result of poor-quality material, rapid wear. Frequent use of reagents when descaling also leads to sad consequences.
To mitigate the problem, install softening filters. They draw magnesium and potassium salts from the liquid. Finding cracks is difficult. Sometimes they appear green spots on the surface. In tubular radiators, you can close the hole with cold welding or soldering.
Bithermic heat exchangers suffer from water shocks, which is why their tubes burst. They cannot be repaired, only replaced.
Feed valve not tight. Inspect the part for wear; it should be in the closed position. The valve is used in cases where the pressure in the circuit is lowered, the coolant is insufficient and it needs to be pumped up. If faulty, replace the tap. If you want to leave the valve in the “closed” position forever, then remove the valve, fill the holes with silicone, connect the valve in the closed position.
Three Way Valve Problems. The element is responsible for the movement of hot water in the system. For example, you have a dual-circuit device installed. When the mixer is opened, the valve switches the flow from heating to domestic hot water and vice versa. If it is broken or clogged, a lot of liquid will leak into the heating circuit, which will lead to an increase in values. Clean valve or replace.
Pressure gauge. This device measures the pressure in the boiler. If garbage gets into his pipes, then you need to clean them. During operation, you must constantly monitor the pressure gauge.
Leak in the heating system. Use a dry cloth to locate the leak. Inspect joints, joints, control valves, welding spots, recharge for serviceability. Check for accumulations of water under the radiators. Immediately you can not detect the place of leakage, because moisture evaporates quickly from hot batteries.
In such cases, completely drain the water and connect the compressor to the terminals. During pumping through the slots, air will come out with a certain sound.
Damage must be sealed. You can use sealant, plumbing tow. Before that, clean the repair site.
Expansion tank wear. Inside the tank is divided into two parts by a flexible membrane. In one part is gas under pressure. Excess fluid enters the other. If there is a gas leak or a worn / damaged membrane, compensation will not occur and the values in the circuit will not decrease.
How to pump nitrogen into the tank:
- Turn off the boiler.
- Close the valves from the boiler to the tank (usually it is equipped with two shut-off devices on both sides).
- Drain the water.
- Connect the car pump and pump up gas.
- Wait for higher values.
After some time, does the problem recur? Replace nipple, diaphragm, expansion tank.
Air congestion. An air plug interferes with the normal circulation of the fluid, which means it reduces pressure. Inspect the air vent. If it is overgrown with scale, remove the lid and clean everything. Bleed the air from the system through Mayevsky taps. To do this, substitute the container and open the valve. Air will come out with the liquid.
When you restart, you can hear gurgling sounds? Repeat until the sounds disappear.
How to start the boiler correctly
To avoid problems with pressure, it is necessary to adhere to the rules of installation and connection. What steps you need to go through:
- Compliance with installation standards.
- Confirmation of the tightness of the joints.
- Turn on and configure network settings.
- Issuance of a guarantee sheet (if the launch is carried out by the company).
Through the lower eyeliner, the pipes are gradually filled with liquid. When the pressure gauge needle shows the nominal value, the valve closes. Excess air is removed. If an air vent is installed, the reset is automatic.
Bleed the pump:
- Turn on the unit.
- Remove the cover to allow access to the pump.
- Remove the central bolt until water leaks out.
- Then tighten immediately.
Adaptation can take several days until the batteries warm up. During this time, you will have to bleed air several times. Track the operation of heating equipment, then your home will always be warm.