I'm trying to figure out why the pressure gauge on the branch of pipe where my Expansion tanks connected is always 2-3 psi lower than the rest of the system. That is when the system is cold or when it is running. I've tested all 3 pressure gauges I have and they are all within .5 of each other.
I have two tanks because with only the Extol 60 at 170 degrees running my system would get up to 25 psi. This was setting off my relief valve which I need to replace anyway. With the second tank added my system only reaches about 21 psi.
So for example my expansion tanks are set to 13 psi. My system is also set to 13 psi. However when I open the shut off valve going to the expansion tanks the gauge on that section reads ~10.5. When the system ran last night it got up to 21 psi on the gauge in the boiler as well as another gauge I have on the drain valve near the boiler. However on that section of pipe where the expansion tanks are it is 18 psi with the system running. I find this odd. It is 3 psi less no matter if the system is running or cold. I switched gauges around to make sure it wasn't an issue with the gauge.
Is this an issue? I thought with the circulator not running the psi of the system should be the same everywhere?
A though I had are it might have to do with that green Thrush flow control valve No.115 that leads to the Expansion tanks.
*expansion tanks will be supported to ceiling once permanent setup is figured out.
thanks
Jay
I have two tanks because with only the Extol 60 at 170 degrees running my system would get up to 25 psi. This was setting off my relief valve which I need to replace anyway. With the second tank added my system only reaches about 21 psi.
So for example my expansion tanks are set to 13 psi. My system is also set to 13 psi. However when I open the shut off valve going to the expansion tanks the gauge on that section reads ~10.5. When the system ran last night it got up to 21 psi on the gauge in the boiler as well as another gauge I have on the drain valve near the boiler. However on that section of pipe where the expansion tanks are it is 18 psi with the system running. I find this odd. It is 3 psi less no matter if the system is running or cold. I switched gauges around to make sure it wasn't an issue with the gauge.
Is this an issue? I thought with the circulator not running the psi of the system should be the same everywhere?
A though I had are it might have to do with that green Thrush flow control valve No.115 that leads to the Expansion tanks.
*expansion tanks will be supported to ceiling once permanent setup is figured out.
thanks
Jay