Below
are listed some procedures for troubleshooting humidifier water problems:
I see problems ever now and then with humidifiers where the water will not
flow, or the water will not stop running, even when the humidifier is turned
off. In many cases it could be a bad water solenoid valve. Check the following
before condemning the water solenoid valve.
Make sure the water saddle valve is not restricted by turning the saddle
valve on. Loosen the compression nut slightly where the 1/4" copper
tubing enters the saddle valve. If water comes out then your saddle valve is
not clogged, and is OK. If there is no water coming out then you will need
to replace your saddle valve.
Take the compression nut loose on the end of the solenoid valve that
exits up to the water distribution tray (not the end where the water supply
copper tube enters). After you take the tube off you should see a tiny plastic orifice up inside the tubing. Lots of time I see the orifice stopped
up with lime deposits. The orifices are sold in the Aprilaire Humidifier
links below. This will definitely cause the water to not flow in
your humidifier. You can take a thin needle and reopen the hole or purchase
another orifice to eliminate this problem.
If you water flow continuously and will not shut off when the blower
stops you probably need a new water solenoid valve. You can check to see if
it is the solenoid valve or an electrical malfunction problem by turning
your furnace power off or unplug your humidifier. If the water continues to
flow with the power off then you definitely need one of the Aprilaire 4040
valves listed for sale in the Aprilaire Humidifier links below.
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We also sell parts and replacement water panels for almost
all Aprilaire humidifiers! The water panel should be changed annually.
Below are listed some of the accessories and supplies you might need when
installing your humidifier.
One accessory that I use on many of my humidifier
installations is a Current Sensing Relay. This nifty little relay allows me to
quickly set up the humidifier to run only when the furnace blower is running.
This eliminates the need for a sail switch or more complex wiring. The relay
attaches around the white (most of the time) common lead of your furnace blower
motor. When the blower comes on it senses there is current and turns your
humidifier on. It is easy to install and comes with complete wiring directions
and instructions. The A50 current sensing relay acts like a 24 volt switch. The
A50 is not designed for 110 volts. You would need the A51 current sensing relay
if you plan on running 110 volts through the relay.
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