If your company's building depends on a boiler to heat the structure, you may walk in one day to find that it is unable to heat the building. After inspection, you may have discovered that the gauges are indicating that the pressure within the system is low, even after attempting to recalibrate the gauges. If so, the low pressure reading could be caused by one of the following possible issues.
Water Level inside the Tank Is Too Low
One possible cause of your boiler's low pressure readings could be that the water level inside the tank is too low. Because the boiler operates using a closed system, the equilibrium between the air, water, and steam within that system needs to remain constant to allow the heat to circulate through the pipes and out into your buildings vents where it can heat the rooms.
Whenever one of those components of the closed system becomes unbalanced, the pressure within it could decrease dramatically. Because water is the heaviest of the three parts of the internal system, any variation in its levels are noticeable sooner.
If the water level has become low, especially if it has done so suddenly because of a leaking tank, the pressure will drastically decrease within the system. If the cause of the water loss is not repaired and more water added to the tank, the pressure will remain low. As a result, your boiler will be unable to do its job of heating your business.
Air or Steam Is Leaking around the Valve Fittings
A decrease in the amount of water is not the only thing that can cause low pressure within the boiler's system. If air or steam is allowed to escape, the pressure can drop. Because the amount of air or steam has decreased significantly, the system is no longer able to force the required amount through the vents, resulting in a cooler building for you and your workers.
The valve fittings are common places where air and steam can escape from the system. If the fittings become rusted, corroded, or otherwise damaged, small holes and cracks form that compromise the integrity of the boiler's system.
When inspecting the boiler for leaks, look carefully at any valves or pipe fittings to see if you find any evidence of leakage. However, do not touch these fittings while the system is running, or you may seriously burn your skin. Any valve fittings that are damaged should be replaced by a professional HVAC repair technician.
Pipe Feeding the Boiler System Is Leaking
If you are unable to find any problems with the water level or valve fittings, another possible reason why your boiler has low pressure is that the pipe feeding the boiler with fresh water has sprung a leak. If the force of water coming into the system does not remain constant, the force of air expelled through the system and into your central heating ducts will be diminished.
If you suspect that a leaking pipe could be the culprit, try to inspect as much of the pipe you can for signs of water dripping or puddling. You can also look along the walls to see if there are any brown water spots or puddles forming on the floor. If so, a plumber or an HVAC company should be consulted.
If you are uncertain as to why your boiler has lost pressure, have a professional take a look at it as soon as possible. Contact an HVAC company that also provides plumbing services so they can fully inspect the entire boiler system and adjunct pipes to discover the cause and discuss with you available solutions for fixing the issue so you can once again have heat for your business.