Humidifier Is Noisy
Problem: When furnace is on,
central humidifier makes an unfamiliar noise.
Background: Some noise will naturally be produced
by anything that moves air. However, if the central
humidifier on your forced-air furnace makes an unusual
sound, there may be specific causes that can be corrected.
Turn off the electricity at the fuse box or breaker panel
or un plug the unit. Then close the saddle valve, which
feeds water to the humidifier, and remove any drain tubing
so the unit can be taken apart and inspected.
What to do: Remove the lower unit by unfastening
latches and pour out any remaining water. If the
humidifier was installed using a plenum stiffener, check
it to make sure it is securely fastened to the plenum and
that all the screws are tight. Then make sure the
humidifier is securely attached to the plenum stiffener.
Next check to be sure that any set screw in the hub of the
media wheel motor shaft is tight. If not, tighten it. Also
check to see that the media wheel is still round. If it
isn’t, it must be reshaped or replaced. Check the
alignment of the wheel, and also make sure there are no
bent blades in the blower or the motor fan.
Special advice: If the noise persists, it may be
due to the rough edges that were created when the ductwork
was cut to mount the humidifier. If these edges are rough,
straighten them. Also check the water pressure to the
humidifier. If it’s too high, it may cause a vibration
noise in the water line (between the humidifier and the
saddle valve). This can be remedied by cutting down the
flow of water at the saddle valve, or by fastening the
water line to a ceiling joist or wall.
Helpful hint: To find
out if the noise is coming from the motor, remove the
media wheel, reassemble and turn on unit. If the motor is
causing the noise, install a replacement or call a
technician to do the job.
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