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Ongoing De-Knuckleheading Project
This is Memorial Episcopal Church, in the Bolton Hill neighborhood of Baltimore. It once had a steeple which I believe was hit by lightning.
The heating system is mostly one-pipe steam, with several unit heaters in the sanctuary that are set up as two-pipe. Boiler is a Smith 28A, using pumped return.
The system knocked, banged, hissed and leaked, and used a lot of gas. So here are some of the cures:
First, the control system was set up so the boiler maintained 7 PSI all the time. You could have used the boiler room as a sauna. The existing control cabinet was in good shape and plenty big, so we removed the old timers and installed a new set of 24-volt relays which operate the zone valves and control the burner. We installed Honeywell VisionPro 8000 thermostats in the zones which handle the setback function. And we installed a set of LED indicator lights so it's easy to see which zone is calling.
Then we changed the Honeywell V4055 single-rate gas valve actuator to a V4062 with low-high-low firing, under control of a Vaporstat. The PowerFlame people told us which actuator to use. The burner drops to low fire at 1 PSI and shuts off at 2.5 PSI. Finally we tuned the burner on the analyzer. These changes resulted in a savings of 35% during the shoulder seasons, less during very cold weather when the boiler was running a lot anyway.
All Steamed Up, Inc.
"Reducing our country's energy consumption, one system at a time"
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Baltimore, MD (USA) and consulting anywhere.https://heatinghelp.com/find-a-contractor/detail/all-steamed-up-inc