riprock69
New Member
I have periodic discharge (once a day) of water in my oil fired heating system through the pressure release valve. The system is a Weil McLain WGO oil burner (one year old) with 6 zones (1 zone used for indirect water heater). Here is what I've done to troubleshoot: replaced the pressure release valve, replaced the pressure reducer valve (set to 15psi), purged all zones, and emptied the expansion tank (its a steel, 15 gallon tank located between the joists). After the expansion tank is emptied, the system pressure does go down to less than 5psi, but after a day, the system eventually goes back to approximately 27psi and the discharge continues.
Just last night, I shut off the incoming water and drained the expansion tank to reduce the system pressure to around 14 psi. The system pressure started to climb up to 21 psi after 5 hours and the next morning, the system pressure was up to its steady state of ~28 psi (with some discharge that night). So, I think it must be the expansion tank. The tank is a 15 gallon steel expansion tank. Bladderless. Is it too small?
Thanks in advance!
Just last night, I shut off the incoming water and drained the expansion tank to reduce the system pressure to around 14 psi. The system pressure started to climb up to 21 psi after 5 hours and the next morning, the system pressure was up to its steady state of ~28 psi (with some discharge that night). So, I think it must be the expansion tank. The tank is a 15 gallon steel expansion tank. Bladderless. Is it too small?
Thanks in advance!