Question about Aprilaire 550 Humidifier

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My humidfier is not working

I am trying to get the water to flow. i replaced th solenoid,new filter.added a new value fomr mainline/

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Is the water on ? if it is you will need to use a multimeter to test to see if you have 120 volts at the transformer, 24 volts from the transformer to the solenoid, make sure you have the low voltage wiring completing a circuit from the transformer, to the solenoid, from the solenoid to the humidistat, humidistat to the transformer again, make sure your transformer is hooked in to only receive power when you are calling for heat, thats about it, hope that helped ya, and thanks for your question, let us know if that helped, thanks again,
mr.grzz

Posted on Jan 21, 2009

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WHEN I TURN ON THE HUMIDISTAT the water line going into the filter just starts gushing!is this the selenoid?


first its important to understand how humidifiers work ,


they work by using a pressurized source of water (prefer demineralized) that enters a chamber that has a device that wicks the water up into it , then a fan induces a draft across it , this produces evaporation of the water into the air flow , this air is then ducted into the air handler for the structure (home?)
now that being said the water chamber needs constant refilling due to evaporation of water from air flow , most times this is handled from a solenoid valve that is basically an electric operated valve , and yes it's logical that it could be tied to a humidistat for demand use only .

also this type of humidifier requires frequent cleaning or it may back up and spill water in the wrong places ,especially if there isn't a demineralizing filter on water line , as the minerals that naturally occur in water don't evaporate and get left inside the chamber , making less and less room for new water to be added

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