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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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.
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 b) connect 120V & neutral to "HUM" terminal and neutral on heater control board. 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 drain.
Most of the humidifiers are run by 24 volts AC. disconnect the power wire to stat on circuit board and check there with meter and connect to low voltage ground for 24 volts, I'm assuming the two wires that power the humidistat are red and white.typically red is used for power. most likely you have power if the red for the stat is connected to the W on the board and the heat works, but the humidifier only works while heat is on.the next thing in line is the humidistat , it's a switch so if there is only two wires going to it take them off the stat and connect together, if furnace is on heat and running and stat wires are connected it will send power to water solenoid, if its not working yet the problem lies in the water solenoid if you have 24 volts at the two wires at solenoid.check while disconnected, do not connect those two wires together or a 3 amp fuse will blow on the furnace board. if you have 24 volts there then the valve may be bad or the valve may be stuck or clogged, loosen water supply line to make sure water is getting to valve. I spent many years working in the HVAC industry.
Do you feel like looking at the humidifier yourself? 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-- Possibly the valve shutting off, could make a plumbing BANG-- you could duplicate that, by lifting the float mechanism and stopping the water-- does that make the noise?
If you can reach and operate the Humidistat control from near the humidifier, do so a few time-- or Have someone cycle the humidistat a few times, and you listen for that sound-- 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!
It sounds like the little wheel that rotates the wet pad, is rubbing, or jammed or what?
Open the door on the return air duct, near the furnace-- See the wheel inside?-- Raise the Humidistat-- can you see the wheel begin to rotate?
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..
Note: When you open the door, the fan will be sucking air into the opening--- that is alright-- you need to see the humidifier rotating, check the drive motor, the big wheel, and the water sump-- is the float working OK-- Not running over-- but keeping the sump filled just right-- You can bend the float arm to adjust the level..
Check it out, and let us know what you need or want to do next.
I hope this helps you, have the repair person check to see if a furnace filter air freshener was installed at your last furnace check up without your knowledge. Also checked all wall and or floor registers to make sure the source of smell is not coming from them, it may be circulating though the duct system.last thing is to replace media pad in humidifier along with furnace filters, if you have air cleaner wash filters with hot water and baking soda, wipe & let dry before re- installing them. Your repair person may have use a strong smelling cleaning solution in humidifier that is now circulating though out your home, good luck.
theholts220 - Sounds like they needed to install a bit larger transformer . You can also buy a A 50 Sensing relay that attaches to the wires for your motor and when you turn on the furnace it will allow the power to go to the humidistat. Very strange though they do not use a lot of power. Check and make sure the wires are not pinched or touching metal somewhere.
TLuzzo - The humidistat seems to be working when you turn it down. The wires for the solenoid should be hooked up to your furnace circuit board. The instruction manual will tell you where. If you dont have a spot on your circut board the A 50 sensing reley is they way to go. They are inexpensive
A noisy humidifier may be the result of an unlubricated fan motor or a drive mechanism clogged by debris. Periodically clean the water reservoir, fan, and nozzle to ensure that they are clean and working properly. To keep your humidifier working smoothly and efficiently, lubricate the fan motor bearings with SAE #20 oil. Be sure to consult your owner?s manual for proper care and maintenance procedures.
If it seems loose, vibrating parts are causing the noise:
1) Disconnect the power.
2) Remove the cover and look for any vibrating parts. Tighten screws, if necessary.
3) Wiggle the fan to see if it is loose on its shaft. If it is, tighten the mounting fasteners. Lubricate the motor's bearings if suggested in your owner's manual.
4) If it still makes noise, call an appliance repairperson or take the unit into an appliance repair shop.