How to lower psi on boiler

Jan 19, 2015 · A 15-psi setting will lift the water to 34'. At 12-psi, the boiling point at the fill valve/gauge is 246 F. At 28', it is 212 F. If the level of the water isn't high enough because there isn't enough fill pressure, the suction pressure on the loop may cause the first water to boil that comes from the boiler on a warm-start boiler. Normal boiler pressure should be around 12 PSI. There are some boiler systems that are slightly higher. To determine the proper pressure for the boiler system requires to fill the system and determine the isolated static pressure. Then add 4 PSI. Here is a graphic showing the pressure reducer valve with a pressure gauge. Standard Cold Operating Pressure. The standard cold water operating pressure of most U.S. and Canadian hot water boilers is 12 pounds per square inch (psi). If the boiler pressure drops below 12 psi, the valve will allow new water into the unit to bring up the pressure reading. • Improved boiler life: Low high low or modulating burners allow for a more stable temperature change in the boiler when transitioning from low to high fire. Some incorporate a low fire hold feature to provide a more gradual change from lower water temperatures or steam pressures to higher operating temperatures or pressures. Allow the jug to be half-filled, depending on the amount of water that has to be released to lower the pressure. Firmly twist the radiator key counterclockwise to close the valve; you can check the boiler pressure and repeat the bleeding process until the boiler pressure is set at 1 bar. you lower the pressure by removing some water from the system. tap the pressure guage with you finger to make sure it is not sticking. guages supplied with boilers are not the highest quality. Post Reply