Question about Aprilaire 50 Current Sensing Relay Humidifier

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Aprilaire model 50 current sensing relay won't close

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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.

Posted on Dec 09, 2012

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Posted on Jan 02, 2017

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I have an aprilaire model 6303 control panel, and the B and G terminal lights are on, on the equipment output and the fan runs continously. Is the board bad or what please help


[PDF]Aprilaire® Zoned Comfort Control® Product Guide

ftp://ftp.aprilaire.com/...Control/5050_ZCC_productguide.pdf

AprilaireAprilaire Model 6303 Control Panel ... with the Model 6504 Intelligent Zoned Comfort system, we have the right control for your ... A control panel coordinates the operation of the equipment with the ..... Proper control of the fan (G-terminal) for either electric.... Auxiliary output relays available to control humidifiers, electronic.

[PDF]Safety & Installation Instructions - Aprilaire

ftp://ftp.aprilaire.com/Fulfillment/Inbox.../6404_install_guide.p...

AprilaireModel 6404. Zoned Comfort ... Do not mount the control panel on any part of the heating/cooling equipment or ... allowing for control of a humidifier. b. HUM LEDlights when the relay is closed. .... on the fan (G output terminal) with a heat call (W1output ..... Run wire between the HVAC equipment and the control panel. 3.Missing: 6303

Jan 20, 2016 | Aprilaire Humidifiers

1 Answer

I have no idea how to wire my Humidifier to the furnace! I am attempting to wire an Aprilaire Humidifier to an older furnace. The supplied wiring instructions are of no use to me because I have no terminal...


Hello, if the transformer you got with the humidifier is one that plugs into a receptacle than all you need is either a current sensing relay or sail switch. First connect one wire to transformer then connect to humidiistat then to either sail switch or current sensing relay and back to other terminal on transformer. if you use a sail switch then it will mount in the return air duct if you use a current sensing relay it will cradle the blower motors common wire. I will post a pic of both robhvac47_19.jpg current sensing relay

robhvac47_20.jpgSail switch

Feb 20, 2011 | Aprilaire 550 Humidifier

1 Answer

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

I have an Aprilaire 550 model. I just noticed that it is not turning off when the furnace turns off. Please advise


Do you have a current sensing relay or sail switch hooked up to it? If not than you need either one of theses to turn on and off the humidifier when the furnace's blower motortruns on and off. I will post a pic of both robhvac47_1.jpg CURRENT SENSING RELAY.


robhvac47_2.jpg SAIL SWITCH

Dec 25, 2010 | Aprilaire 550 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

Aprilaire 560 not keeping contant power to cause humid. to work


You may be havig problemm w/ the current sensing relay, try bupassing the current relay and see if the hum. comes on and if it comes on the try rapping the wite wire from the main blower 2 times. hope that helps

Feb 02, 2009 | Aprilaire 550 Humidifier

1 Answer

Power is off to aprilaire 550


The Aprilair Hum. donot have a restart button. All there is there is just a 24VAC Solenoid that opens and lets the water flow throu a tube. Check your humidistat, check your wire going to the furnace control board and also your current sensing relay if you have one.

Feb 01, 2009 | Aprilaire 550 Humidifier

2 Answers

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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