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What's your problem?Wire connection for GeneralAire power hfumidifier #1137

When blower motor turns on I want electrical current to turn on power fan on #1137 power humidifier, but turn off when blower motor turns off.

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You will need a current sensing relay to cradle the blower motors common wire to accomplish this.

Posted on Jan 08, 2013

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1 Answer

Is Aprilaire 500M suppose to turn on when furnace motor turns on?


The humidifier should turn on and off with the blower motor of the Furnace. This can be done by wiring the the humidifier to the HUM terminal on the furnace control board and then stepping down the power with a transformer. If the humidifier has it's own tarnsformer then a current sensing relay can be used by attaching it to the blower motors common wire.

Jan 13, 2013 | Aprilaire Humidifiers

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Aprilaire model 50 current sensing relay won't close


If the relay is not closing then it must be replaced. It works by sensing the current through the common wire of the blower motor.

Dec 08, 2012 | Aprilaire 50 Current Sensing Relay...

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Wiring a generalaire 1042 humidifier to a goodman furnace,when there are no terminals marked hum


24 VAC HUM
The yellow wire connected to the I.D. Blower pressure switch
is powered anytime the pressure switch is closed and provides
24 VAC humidifier control. Remove the yellow wire and connect
the supplied brown jumper wire to the pressure switch
terminal. Reconnect the yellow wire to the "piggyback" terminal
on the brown jumper and then connect the 24 VAC line of the
humidifier to the stripped end of the brown wire. Using a wire
nut or a field-supplied quick connect terminal can make this
connection. The wiring must conform to all local and national
codes. Connect the COM side of the humidifier to the B/C
terminal on the furnace control board (or to the COM side of
the 24 VAC transformer). DO NOT CONNECT 115V HUMIDIFIER
TO THESE TERMINALS.

Feb 21, 2011 | Humidifiers

1 Answer

Water constantly runs when furnace is on or off. I wired it exactly how the diagram said but the water never shuts off.


Hello, In order for the humidifier to turn on and off you need either a sail switch or current sensing relay. A sail switch senses air flow and will turn on the humidifier when the blower motor kicks on and a current sensing relay senses current through the blower motors common wire. If you have either of theses hooked up already and the solenoid valve remains open then the solenoid valve must be replaced.

Jan 24, 2011 | Honeywell HE220A1019 Whole House...

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The water runs constantly, not just when the furnace turns on.


Do you have a sail switch or current sensing relay with this humidifier? In order for the humidifer to turn on and off u need either a sail switch that senses airfllow in the return air duct and will turn off the humidifier when the blower motor stop or a current sensing relay that senses current on the blower motors common wire. I will post of pic of each one

Sail switch robhvac47_3.jpg


Current sensing relay robhvac47_4.jpg

Jan 03, 2011 | Aprilaire 700 Humidifier

1 Answer

My aprilaire won't turn on, no power and it looks like all the conections are good, and power outlet is getting power. Any suggestions?


You need either a sail switch or current sensing relay to turn the humidifier on and off when the blower motor turns on. They both accomplish the same thing but in differant ways, a sail switch senses the airflow in the return air duct and a current sensing relay senses the current from the blower motor.

Dec 20, 2010 | Aprilaire 700 Humidifier

1 Answer

Instructions on how to install the current sensing relay i had my furnace serviced and the tech told me this is what i need but if i can do it myself id rather the part is $60


You take the current sensing relay and put the blower motors common lead thru it, usually will be the white wire going from motor to control board. Then you take one of the wires from the current sensing relay and attach to humidistat and then take the other wire from current sensing relay and connect to transformer. This way everytime the furnaces blower motor turns on the humidifier will turn on and when the blower turns off so will the humidifier.

Dec 17, 2010 | Aprilaire 50 Current Sensing Relay...

1 Answer

I just installed a General 1137 Humidifier. IT


One of the Humidistat yellow wires that was secured with a wire nut had broken off at the insulation line of the wire. While the connection felt secure, the electrical connection was broken.

Dec 17, 2009 | General Filters 1137 Humidifier

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My aprilaire 600 humidifier stays on when the blower shuts off


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

Oct 30, 2007 | Aprilaire 600 Humidifier

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