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1 pipe steam system help. Boiler runs for long time. Return pipe leaking water
Thanks in advance for any help.
I live in an old house with steam system that is probably 20-30 years old. Everything has been working fine till now but running into some issues since I turned the heat on this season.
It is a 1 pipe steam system with 4 radiators on 1st floor and 4 in the 2nd floor. Here is the issue I am having
- The boiler keeps running for a long time until the thermostat turns off the heat.
- The pressure gauge in the boiler says 10psi (not sure how accurate this is)
- The main vents (I am assuming this, they are on the smaller angled pipe going back to the boiler) keep hissing and releasing steam (after the radiators are all hot, 20-30 mins)
- Once the hissing starts, i can see water dripping from one of the joints on the same smaller angled pipe going back to the bottom of the boiler. Not sure it is because of loose joint or overpressure?
- The pressuretrol is set to .5psi for cut-in and 1 psi for diff but it never actually turns the boiler off. It is a Honeywell PA404A 1009 2. When I lift the bottom plate of the pressuretrol manually the boiler does stop running.
- The pigtail is connected to the top of the water level glass and it never seems to get hot to the touch farther than halfway. Not sure how the pressuretrol works
Please advise. Is this a bad pressuretrol, bad pigtail? Is the water leak because of overpressure? I have already had several plumbing companies come in and they all changes one thing or another but the problem is still there.
- 1st plumber said it was a venting problem and replaced all vents on mains and radiators.
- 2nd plumber adjusted pressuretrol and replaced a section of pipe saying it was corroded (pipe that goes from water supply into the boiler for a separate issue.)