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Why does the pressure in the boiler rise? What to do to restore work? First of all, understand the causes of the problem. In this mode, the equipment works with a double load. In the best case, an error will appear on the display, and the security system will block the operation of the device. At worst, if one of the parts breaks, an explosion can occur. How to determine the increase in pressure and reduce the pressure, we will describe in this article.
Causes of rising pressure. Ways to solve the problem
To understand that there is too much pressure in the system, you can use the pressure gauges. Normal readings are 1-2,5 bar. If the pressure gauge needle reaches 3 bar, sound the alarm. If the increase is constant, it is urgent to find the cause and reduce the pressure.
Also pay attention to the safety valve: to relieve pressure, it will constantly emit water.
Expansion tank issue
This tank can be located separately from the boiler or be part of the structure. Its function is to take excess water when heated. Hot liquid expands, it becomes 4% larger. This excess is sent to the expansion tank.
If the volume of the product is too small, then it will completely fill with water. With a subsequent increase in temperature to 85-90 degrees, the tank will no longer be able to compensate for these 4%. So the pressure will rise.
The size of the tank is affected by the power of the boiler. For gas equipment, its volume is 10% of the total amount of coolant. For solid fuel – 20%.
Membrane rupture. If the part is damaged, the coolant is not restrained by anything, therefore it completely fills the compensation tank. Then the pressure starts to drop. If you decide to open a tap to add water to the system, the pressure will rise above normal. The connections will leak.
The tank or diaphragm needs to be replaced to reduce the pressure.
Pressure below or above normal. A machine pump will help to achieve normal values uXNUMXbuXNUMXb(nominal value) in a gas boiler.
- Drain all water from the system.
- Close the valves.
- Pump the circuit until you are sure there is no water.
- How to release air? Through the nipple on the other side of the supply.
- Download again until the indicators reach the norm indicated in the instructions for Ariston, Beretta, Navien and other brands.
The location of the tank after the pump provokes water hammer. It’s about how the pump works. When it starts, the pressure rises sharply, and then also drops. To avoid such problems, in a closed heating system, install a tank on the return pipe. The next to hit is the pump in front of the boiler.
Why pressure rises in closed systems
Air accumulates in a double-circuit boiler. Why does this happen:
- Wrong filling with water. The fence is from above, too fast.
- After repair work, excess air was not released.
- Mayevsky cranes for air release are broken.
- The pump impeller is worn out. Adjust or replace part.
To relieve or reduce pressure, fill fluid correctly. The fence is carried out from below, slowly, while Mayevsky’s taps are open to bleed excess air.
Open System Issues
Problems are the same as described above. It is important to properly fill water and bleed air. If after that the pressure has not returned to normal, it is necessary to drain the system.
Secondary heat exchanger
The unit is used to heat domestic hot water. Its design consists of two insulated tubes. Cold water flows through one, hot water flows through the other. If the walls are damaged, a fistula appears, the liquids mix and enter the heating part. Then there is an increase in pressure.
If you do not want to repair and solder the heat exchanger, you can replace it. To do this, buy a repair kit and get to work:
- Shut off supply valves.
- Drain the water.
- Open the case, find the radiator.
- The assembly is secured with two bolts. Unscrew them.
- Remove the defective part.
- Install new gaskets at the mounting points and connect the heat exchanger.
Other reasons
There are other reasons for such problems:
- Armature closed. During the intake, the pressure rises, protective sensors block the equipment. Inspect the taps and valves, unscrew them until they stop. Make sure the valves are working.
- Clogged mesh filter. It is clogged with debris, rust, dirt. Remove and clean the part. If you don’t feel like cleaning regularly, install a magnetic or flush filter.
- The feed faucet is out of order. Perhaps its gaskets have worn out, then you can get by with a replacement. Otherwise, you will have to change the valve.
- Automation problems. Faulty thermostat or controller. The reason is wear, factory marriage, incorrect connection. Diagnostics and repairs are underway.
Check whether the boiler protection parts are in good condition: pressure gauge, valve, air vent. Clean radiators and other components from dust, soot, scale. Prevention helps prevent serious damage to gas equipment.