Don't forget the water orifice & strainer
I'm an HVAC technician, and have replaced dozens of these. Remember to order an Aprilaire 4004 In-Line Strainer and the correct orifice for your humidifier model when you order this solenoid valve, because it doesn't come with them. If you forget the orifice, don't be surprised when water starts gushing out of the humidifier, because the orifice regulates the amount of water fed to it. The strainer goes in the long end of the solenoid fitting, and the orifice in the short end.
Aprilaire 4231 Yellow Orifice: Aprilaire models 400, 500, 550, 550A, 560, 568 & 600.
#4021 Aprilaire Red Orifice: Aprilaire models 112 & 224.
#4232 Aprilaire Blue Orifice: Aprilaire models 350, 360, 440,...
Excellent part (and far cheaper than a repair man fee!)
About a week ago I noticed that when my furnace was off...my Aprilaire humidifier just kept running. Well, to be more specific, the water flow into the Aprilaire was remaining on. At first I feared the control system in the furnace was failing to send the "close valve" signal. But a bit of investigation uncovered the culprit: the solenoid valve was "leaking"! When the furnace was running, it dutifully sent an "open valve" signal, and the solenoid fired as usual, sending water to the Aprilaire. But when the furnace shut off (and/or the humidity set point had been reached), the signal to "close valve" was properly sent, but the solenoid did not fully close. The water supply decreased, but there was significant leakage passed the seat of the valve, causing the water to run down the drain 24x7.
Option 1 was to call my furnace company and have them come replace it. My guestimate was $100-150 to make that happen. While they are normally worth every penny, in this case I...
Not as in the picture!!!
This company does not ship what is pictured. They ship a cheaper imitation part from China. It will work but does not fit like the original. They should be ashamed of themseves for misleading people with what is described and pictured. I went with this company for all the good reviews and thought that I would get what was pictured to avoid the cheaper imitations. I will complain to Amazon but at least the part does work for now or at least the last 15 minutes as I just installed. I also gave them a 1 star for misrepresentation.
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