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Help restoring Hoffman System
We moved into a 90 year old house in 2016 in Eastern Iowa. Just now getting around to understanding the steam system and my goal is to restore as much as possible throughout the house. Thank you all for the information posted here and on YouTube. Learning about this community was incredibly helpful to undertake this home restoration. My system has issues and I'm asking for advice on what needs to be done and improvements possible. I own and read LAOSH, "We Have Steam Heat" and spend many hours on "The Wall" reading and thinking. Thank you all again!
#1 Cycles on low water - condensate returns about 1-2 mins after shut down.
#2 Occasional mild water hammer - random occurrence.
#3 Hearing a strange sound, similar - but not the same as - air bubbles entering the office water cooler coming from the pipes
#4 Strange piping arrangement on wet returns [see top down photo]
#5 Wet return drains only a trickle from bib, Boiler drain doesn't drain any water.
More about my system:
2 pipe Hoffman vapor heat, with differential loop
Venting: Main: Hoffman #15 and 2x #18 crossover traps, 1 air vent on rad. on 2F BR (I understand this is covering up some other issue).
mostly #18 traps. various working condition
mostly #7 valves. various working condition
16 total radiators and in-wall convectors. (no EDR calculation yet, waiting on E.D.R. book),
Boiler: WM EG-65 approx. 20+ years old
Insulation: Asbestos w/ a little fiberglass
P-troll: in: .5 / out: 1.5psi
LWCO: Safgard 400
Auto feed: VXT-24 on 2min delay/2 gallon feed
Please let me know if you have any follow up questions, I tried to start out with the basics first.