Question about Aprilaire 550 Humidifier

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Aprilaire550 water clicks on with furnance but wont click off with furnance replaced control transformer and soleniod and out door sensor

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  • joconnll Jan 29, 2008

    this was an exsting humidifier
    1. soleniod yellow wires are hooked up to to h on the auto matic control
    the transformer from the furnance motor is hooked to R and C along with the transformer connected to a light for power
    water flow is not the problem
    it will turn on but wont shut down when furnance and furnance motor turn off .i have to turn switch to off on auto controller
    model 550 is connected to 1-model 56 automatic humidifier control
    pretty sure i got the wiring right

  • joconnll Jan 29, 2008

    refer to this diagram
    there is no diagram

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  • 226 Answers

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.

Posted on Jan 29, 2008

  • earl llanera
    earl llanera Jan 29, 2008

    refer to this diagram:

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