WARNING: Thermal expansion of water, if not compensated for in system design, will lead to the early failure of components. Air pressure will force this water out of the expansion tank into the supply once usage resumes. The expanded water is flowing back from the heater and into the pressurized storage bladder of the expansion tank. The pressure should increase only slightly then hold steady throughout the recovery cycle.
The valve will close once the pressure falls below the pressure setting of the valve.
The temperature and pressure relief valve (T&P) or PRV should open and release water once the pressure reaches the maximum setting on the valve.In that case the pressure will increase slightly, hold steady for a short time and then rapidly increase. A small amount of thermal expansion control may be built into the system because of trapped air pockets or a water hammer arrestor. If the system is closed, the pressure will start to climb steadily and rapidly.Turn the thermostat back up to its normal position, so the heater cycles on. Check the water pressure gauge, and turn the pointer so it lines up with the pressure indicating needle.Make sure that outside fixtures, if they are on the same system, are turned off too.
Shut off the drain valve and make sure that no other fixture in the system, hot or cold, is open.Open a hot water tap and allow 15% to 20% of the tank’s volume to run out.Open the drain valve, so the gauge reads system pressure.
#Finding age of water heater install
Turn the heater thermostat all the way down, and install a water pressure gauge with dead hand on the drain valve.The water in a water heating system expands when it is heated and has a greater volume.įollow these easy steps to diagnose thermal expansion: The most common reason a T&P valve is dripping water is thermal expansion.
0 kommentar(er)
