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Hello, I have a single pipe steam heating system for a 2 story single family house. Slant fin gxha-160 edpz gas boiler and a total of 8 radiators with all working air vents. 1 main vent on the return line which is a Gorton # 1 and a Honeywell pa404a pressuretrol. Boiler is around 5 years old but not sure if it was ever skimmed when installed. Though water seems clean enough and sight glass water level is pretty solid and not bouncy. Pigtail was recently cleaned and the water in boiler is relatively clean with no mud.
A couple of issues I am having that I can’t figure out is 1. I can’t dial in the pressure to where I need it and 2. A banging radiator that eventually stops working.
For problem 1 I have the pressuretrol set to cut in at .5 and cut out at 1.5. But my boiler cuts out at around 4psi and cuts back on at 2psi. Pressure will rise to 4psi in about 30 minutes cutting the boiler off at which point in 2 minutes pressure will fall back down to 2 psi kicking the boiler back on. Then again pressure will rise to 4psi from 2psi in about 5 minutes. So I have a boiler cycling on and off about every 5 minutes until the thermostat is satisfied. Is this okay?
Also I heard I can further calibrate my pressuretrol. Can someone guide me to which screws exactly calibrate the pressuretrol. I have 2 hex screws right above the diff wheel are those the control?
As for problem 2. I have one problematic radiator which happens to be on the second floor and furthest from the boiler. It was also recently relocated which leads me to believe the contractor probably piped it incorrectly. The problems with it are 1 it bangs. So I raised the radiator and also pitched it correctly. This mitigates the banging quite a bit. But what eventually happens is the air vent starts spilling out a lot of water. I’ve tried a Gorton #6 and maid o mist #4 which both eventually leak water. Surprisingly a Hoffman #40 behaves differently as in it doesn’t leak out the water instead it locks up at which point the radiator stops working. If I unscrew the Hoffman some water spits out of the vent and pressure is relieved as I can hear a bunch of air moving and water gurgling. A few bangs later and the radiator is back working for a day or so until water and/or pressure build up again. Interestingly if I screw on a cheap off brand air vent it seems to malfunction and let’s out a bit of steam. This allows the radiator to stay working with very few small hammering but at the expense of letting some steam vent out.
It’s pretty certain the horizontal piping for this radiator was probably laid incorrectly but I am wondering is there anything else I can do to try and assist this radiator. It seems to me there’s a lot of pressure and air coming into this radiator for some reason and if I can somehow modify the amount of pressure coming into this radiator that it would help. Any ideas?