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Condensation/feed tank problem
I am working on a residential two pipe system which stopped working. There is a 440K peerless steam boiler with a condensation feed tank. The boiler would not start. I found the LWcut off blocked, I cleaned it. still no go. i traced the low vol wiring and found that the vaporstat was not working. I removed the pigtail and made sure everything was clear replaced everything and the vapor stat still not responding. replaced vapor stat with same
set main at .5 lbs and dif at 6 oz this is the same settings the old one had. Bingo boiler started working. However banging in pipes ( which owner said was normal) . The atmospheric vent in the cond tank was spewing steam. I started to investigate the system and found thermostatic steam traps many of which wer buried in renovated walls and built in cabinets not accesible for checking or repair. I spoke to my supply house old stem guy and he said i needed a F&T stem trap. This would solve the problem, as the radiator steam traps werent working. The owner decided to leave this situation for a while. the system worked fine. I was called back and i installed the F&T. perfect no more steam escaping the vent, little or no banging. However the boiler would not start. found the second (probe type) LWCO which controls the condensation/ water feed tank not functioning. I replaced it against my vendor advice. He said this would not work. I said it had for years (over 10 according to the owner) thus i replaced . boiler worked fine watched it cycle and appeared to work fine. left received a call that the boiler never started after i left. BTW the pressure gauge is a 30 lbs type and a OZ type is not readily available. I tried changing the pressures and found that the manual reset pressuretrol had tripped. i eliminated the pressuretrol and watched the same thing happen again. no heat. Any advice