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I just finished installing a 16KW Generac System and am tweaking it some. Part of my tweaking is to desensitize my UPS's and to just try and observe differences between Hydro and GenSet Power.

The one difference I notice is that I have a buzzing sound in our boiler area (off the laundry room).

Our heating setup is boiler fired hot water, low voltage zone valves and circulating pump.

I'm suspecting that the buzzing is coming from the low voltage transformer but haven't been able to confirm that as I'm reluctant to do excessive playing. I figure I'll have time to play at next power outage, which is expected tonight. Thought I'd gather info in the meantime.

As a last resort I am considering not feeding power to the boiler circuit during outages, which I could get away with as we don't get super cold weather as the norm.

Or perhaps I'll make sure I have a spare transformer, just in case :)

Thanks in advance for any ideas/suggestions.

Heinz
 

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That buzz is very likely the 24V transformer. They do buzz louder as they age. It means nothing. Having a spare transformer handy, especially if you live in a rural or remote area, is never a bad idea. They are certainly cheap enough. Since you have zone valves, you may have more than one such transformer for your system.

The relay in the circulator control box can also buzz.
 

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Thanks md, I'll do some snooping around the control box.

The quirk is of course that when on Hydro, no buzz sound. Might be the difference in voltage though as on Hydro we are at about 110 (117 with a True RMS VM) and on GenSet 120-125.

My main concern was that I may have missed a component to check.
 

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The quirk is of course that when on Hydro, no buzz sound. Might be the difference in voltage though as on Hydro we are at about 110 (117 with a True RMS VM) and on GenSet 120-125.
Sure. After all, your generator isn't making as "perfect" of AC as you get from the utility. Realistically, it's nothing to worry much about. Just an interesting oddity, is all.
 

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I have read that some furness are very sensitive to power. Generator power is often clean enough for the electronics to operate.
 
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