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Whats a sail switch - Aprilaire 550 Humidifier

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A sail switch is a Blower "on" proof switch. It's purpose is to prevent equipment such as air cleaners and/or humidifiers from energizing unless the blower is running. The sail switch literally has a sail that is put in the ductwork. When the blower starts, the airflow will push the sail so as to close a switch allowing accessory equipment to operate.

I hope you find this information to be very helpful to your moving forward. Let me know if you have any further questions, comments, or concerns.

Please leave a rating. :-)

Posted on May 11, 2010

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He360 fan and water run continuously


Check yor wiring, make sure you have sail or pressure switch wired in series with humidistat to humidifiers 24V power. Pressure or sail switch will disconnect humidifier when furnace fan is off. Humidifier (110V) could be connected to any closest electrical outlet.

Nov 10, 2013 | Honeywell HE360A1027 Whole House...

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

Wired a new 360 through Hum blew 3amp fuse. How to wire so it doesn't blow fuse. Have open EAC and EAC2.


Review figures 5, 6 and 7 on the installation instructions and compare with how you wired your installation.
The red wires are not used if you use a mechanical humidistat, (are used with electronic humidstat - supplies 24 volts and go to "hot", "commod" on humidstat). Yellow wired to "Hum" whether electronic or mechanical humidistat used.
If using sail switch or current sensing relay, cuts into one of the yellow wires. - One yellow goes directly to humidisat, then comes out of other side of humidistat & runs to to relay (or sail switch), and comes out of relay (or sail switch) and runs back to humidifier.

Dec 17, 2010 | Honeywell HE360A1027 Whole House...

1 Answer

I was told by the technician tha insalled my funace that I could wire te humidistat to it bu I cant remember what teminals to use the terminals are lettered G W R Y C the thermostat uses W R Which one...


None of these.

Coming off the humidifier you wil find 2-red and 2-yellow (through a plug).

The red supplies 24 volts and is wired to the "hot" and "common" terrminals of an electronic humidstat. (They are NOT used if using a mechanical humidstat.)

The 2-yellow are wired to the "HUM" terminals of the humidstat (either mechanical or electronic).

If you are using a sail switch or current sensing relay, it cuts into one of the yellow wires. (Yellow from humidifier to to humidstat. Then from other terminal of humidistat yellow runs to to relay (or sail switch). Then from other terminal of relay (or sail switch) yellow back to humidifier.

Dec 14, 2010 | Honeywell HE360A1027 Whole House...

1 Answer

INSTALLED HE360A, FAN MOTOR RUNS, EVEN WHEN FURNACE IS OFF? IS THIS NORMAL


Yes - but it doesn't have to work that way. There are several methods you can use to have the humidifier run only when the furnace runs. Look on the back page of the installation instructions. The method I chose was to install a sail switch. This is a switch with a arm attached which has a "sail' attached to it. When the furnace blower runs, the sail catches the blower airflow and activates the switch; allowing the humidifier to operate.
You can also wire in a current sensing relay (figure 6 on the instructions) or connect the humidifier directly into the furnace motor ignition box (if so equipped. My furnace dates to the late 70's and has no place to plug in a humidifier; which is why I installed a sail switch.)
Now however I probably would go with the current sensing relay option as this looks to be the easiest route to follow. Honeywell has their 32001754-001 avaliable for less than $35 from Sears.

Dec 01, 2010 | Honeywell HE360A1027 Whole House...

1 Answer

What is the purpose of the sailswitch


The sail switch is in the cold air return it is wired in with the humidastat when your furnace goes on the air movement pushs the sail down inside the duct work that makes a contact the lets the 24volts to the humidastat. If the humidastat calls for moisture it turns on the humidifier but only when the blower on the furnace is on So in short it detects air movement

Oct 03, 2010 | Honeywell HE360A1027 Whole House...

1 Answer

I've installed a Honeywell 220A whole house humidifier. I've wired the humidifier, sail switch, humidistat and transformer according to the directions, but nothing happens when I turn it on. No water is...


push sail switch forward by hand to see if that is the problem.
Remove two wires at humidifier and connect them if it starts than it is in wiring, humidistat, or transformer.

Oct 14, 2009 | Honeywell HE220A1019 Whole House...

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