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Baltimore/Maine Doug

Baltimore/Maine Doug

Joined on June 3, 2009

Last Post on June 12, 2009

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My guess is that

@ June 12, 2009 5:51 PM in Radiant not silent?

you are hearing a harmonic from several vibrations. The low frequency could be generated by vibrations that are close in frequency. These types of vibrations add to each other or subtract from each other to make slower or faster virbations. You could have a 1 Hz vibration if two primary vibrations are very close to each other. This may sound almost like a thrum thrum thrum at about 1 or 2 per second. If the system you heard has multiple circulators I would shut them off one at a time or experiment with pairs to see if the frequency shifts or disappears altogether. Sympathetic vibrations can be hard to trace because the source of the ofending frequencies may be a distance from the point or area of the sound.

This type of activity

@ June 5, 2009 9:32 AM in Nat Grid

is part of the bailout plans for CEOs and execs of energy companies. Ya get stiffed twice.

My \"personal\" heating system

@ June 3, 2009 4:05 PM in Your personal heating system?

lies next to me in bed as she has done for 41 years. Best system still. However, my building in Maine is radiant floor and panel rads, Biasi/Reillo. House in Baltimore is gas/roasted air. Now in son's gas/steam house.

Genny specs?

@ June 3, 2009 3:44 PM in Buderus won't run on generator

Is this a 3600 or 1800 rpm generator? The 2 pole generators that run at 3600rpm for 60 Hz create a crappy sine wave. It can look more like a stepped square wave with noise on top of it. 4 pole 1800 rpm units are better but still not as clean as house AC. I would not even recommend a 2 pole unit. You might try conditioning the output of the 1800rpm unit or as suggested using an inverter to clean it up. Is the generator on a transfer switch which if wired correctly completely isolates the house from the powerline AC and provides a proper ground. The generator ground may require additional external ground rods when it is not connected to the neutral/ground bus that normally would be wired to the powerline AC (interrupted by the transfer switch). Is the boiler circuit and some other circuits just a partial house load for the generator? A smaller generator may have a transfer switch but be wired to just some of the loads like fridge, some lighting and the boiler. In this case I would look at how the wiring was handled. There may be some ground loops because the partial loads are not properly isolated. Is this a case where the partial loads are on a sub-panel off the main panel with a transfer switch between? A sub-panel has its neutral/ground jumper removed when fed by a main panel. When run off the generator, it can be acting as a "main" panel and need the neutral/ground reconnected now that it is isolated from the house main panel. In the case of the Buderus, they must either checking for correct power or just sensitive to incorrect power.