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Posted on Oct 30, 2007
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My aprilaire 600 humidifier stays on when the blower shuts off

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  • pictureguy Nov 30, 2007

    Mine does the same. Water is constantly flowing when the furnace blower is not running.

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Roger99

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  • Posted on Feb 07, 2008
Roger99
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I have the same issue. Mine is hooked up via Current Sensing Relay. I runs even after blower has stopped. My humistat is set to 30. I can manually turn it off or set it to lower than 30 setting which turns it off. But then it never comes on when Blower starts unless it is set to above 30. I have a 20 year old Rheem furnace and my Relay is connected to a common (White) wire. Any help will be greatly appreciated.
Regards,

  • Roger99 Feb 07, 2008

    I solved my issue. It was my A50 not currently wired. After I connecected to the proper common wire all started to work.

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  • Posted on Feb 05, 2008
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Make shure the 24 volts is hooked up to power that is only powered up when the blower is running. Some furnaces have a HUM terrminal on control (make shure the HUM is 24 volts some are 120 volts then you must use the transformer supplied with the AP 600). You can use a RP # 50 relay that senses current only when the furnace motor is running on the heating speed. Hope this helps

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Related Questions:

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Does the aprilaire 600 plug into an outlet? If so, where is the power cord on the humidifier? I have no water and it makes no noise, so I am wondering if it is an electric problem
Hello, no the humidifier does not have a power cord. It needs to be wired to a transformer to provide 24 volts to power it.
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Dec 01, 2011 • Aprilaire 600 Humidifier
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Mar 15, 2010 • Aprilaire 600 Humidifier
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Keep running
You should have a #50 relay hooked up to the main blower assembley to turn the 24 volts on and off with the blower to the humidistat. Alot of humidifiers sold do not tell you about the #50 relay. They assume that you are a hvac pro and you aready know about.
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Feb 16, 2008 • Aprilaire 600 Humidifier
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If the water is always on make shure the 24 volts is hooked up to 24 volts only when the blower is on. Some furnaces have a HUM terminal but make shure it is 24 volts some are 120 volts you must use the transfomer with the AP 600. You may may use a RP50 relay. The setting 5 or 6 is about the avg setting slowly turn down to see if it shuts off .Also make shure the damper is in the winter setting. Hope this helps
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Chech to see if the out door sensor is hood up,also take off the small panel you will see a small switch make shure it is in the correct position baypass or power. being a AP 600 it should be in the baypass mode. Hope this helps
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Jan 11, 2008 • Aprilaire 600 Humidifier
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