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Pinging noise in duct work

We have a four story townhouse in Chicago with an upper and lower furnance. We are getting a pinging/water on metal sound coming from the lower unit that is heard on our top floor near the roof line where the vent stack is located. The noise is much more prominent in the overnight hours. Could the cause be the humidifer leaking or putting too much moisture/water into the furnance?

This started a few weks ago with the high winds and severe cold.

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It could be merely condensation or maybe the expansion and contraction of the metal as it heats up and cools down. if possible try insulating the vent if not done so already

Posted on Feb 04, 2009

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Odd for both to be out. Check the water supply sometimes corrosion or scale will block the saddle piercing valve. Run it all the way into the pipe. Usually need to spin the little valve handle clockwise. Then back it all the way back to full open and reset humidifier power and furnace power. After that may want to crack open water supply connection right before the solenoid at each humidifier to make sure water is getting to them.

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Did you just install this unit, or has it been working for a while and just stopped?
1. If you just installed it, the solenoid wires (yellow) must be hooked up to switch in when you have a call for heat.
a) use a current sense relay OR
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2. If it has worked before, maybe the saddle valve is plugged. Turn the "T" handle all the way clockwise, then all the way out CCW. You can hear the water start flowing. Loosen compression fitting at solenoid valve to make sure water is getting there.
3) Also, you must supply 24V to the circuit to open the solenoid valve. Check your wiring. It depends on the model what way to wire it and I cannot go into that here.
4) Testing: Turn off humidistat control. Turn on heat, wait for blower to come on. Turn humidistat control to test posn. Solenoid valve should click. This will put water into top of Aprilaire tray, after few minutes it will dribble out bottom clear vynl tube to the
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You can open the door on the unit, while the furnace is running--
The humidifier is usually installed in the return air duct, so there will be a sucking of air into the open door, when you open it.

There is usually a large wheel, with a wet pad wrapped around the circumference.
This wheel rotates slowly, and picks up water from the sump-- does everything look and sound quiet as it runs? -- The float valve has to open and close, to c ontrol the leve of water in the sump-- (The pool of water the wheel runs the mat thru--
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Is it in the humidifier itself, or the duct work nearby?

It might be that the humidistat wheel scrapes against the side of the sheet metal duct work? -- Sounds travel a long ways in metal duct work!

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Open the door on the return air duct, near the furnace-- See the wheel inside?--
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Maybe you hear the noise more plainly now-- can you see where the noise is coming from?

While you are in there-- can you see the pad?-- does it look like it should be replaced?-- When was the humidifier last serviced? -- You can get a new pad or two from your local hardware store-- and they should be replaced ever few months-- (or as needed) in the heating season..

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