Question about Aprilaire 700 Humidifier

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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.
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1 Answer

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3 Answers

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Hello All,

Was having a similar problem. Disconnected the source line and opened saddle valve. I was getting water to the solenoid but nothing out the other side. My humidistat doesn't have a "test" setting, it's either off or the highest humidity. I held the outbound line in my hand and experimented with adjusting both sadlle valve and humidistat. I didn't get any water until I opened the saddle valve MUCH further than I thought was necessary and turned the humidistat to near the highest setting. Once I had water coming though I experimented with the setting on the humidistat, turning it off and then slowly increasing the humidity until the solenoid clunked and water started coming out. I would recommend anyone having this same problem to open the saddle valve all the way (I was surprised how many turns that took) and set the humiditstat to it's highest setting.

Randall

Dec 15, 2007 | Aprilaire 550 Humidifier

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