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What is the purpose of the sailswitch - Honeywell HE360A1027 Whole House Humidifier Humidifier

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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

Posted on Nov 17, 2010


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If i hook my Aprilaire 400 Manual (not auto/digital) humidifier up straight to a 24v wall outlet instead of to the furnace, will it still work correctly? Or does it need to be powered by the furnace to...

Your humidifier is a bypass type. The only voltage needed is 24vac to open the water valve. Air only flows through the humidifier when the furnace blower is running, and the wet pad will add very little humidity if the furnace is not running and heating the air before flowing through the wet pad in the humidifier.
It is best the water valve is only energized when the furnace is running. Some furnaces have a connector on their control boards labeled HUM for this purpose. Test it's voltage when the furnace is running because some will output 110vac instead of 24vac you need.

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My water is black. is it now unsafe to use?

The question is why is it black? Is it mold or mildew? Has the unit every been cleaned and flushed regularly? If you answered NO, to the last question, that may be the problem. You can flush the system by using a 50/50 solution of White Vinegar and Bottled Distilled Water. After doing that, wash the interior of the water container with soap and water. Then run another flush cycle of Bottled Distilled Water. In the future, if this was the problem, use bottled distilled water only for humidifying purposes.

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Unit is less than a year old and the water does not seem to be entering the unit. the valve is all the way on and nothing is dripping out of the condensation line. Any ideas?

Check to see if your solenoid valve is receiving 24 volts by using a multimeter and putting each meter lead to each of the incoming wires to the solenoid valve, if you are getting 24 volts and the valve wont open replace the solenoid valve. If you are not getting 24 volts then Start at the transformer and see if you are getting 24 volts there, if you are then the problem is either loose wiring or the humidistat or sailswitch/current sensing relay is bad. If you are not getting 24 volts at the transformer then turn off power to the transformer and set your meter to read continuity, then take your meter and check the secondary side of the transformer for continuity, if none is read then replace the transformer.

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Aprilaire 400 humidifier. No water flowing to the pad. I've checked the supply -- working. Replaced the solenoid, not working. Checked the electrical to he solenoid wnen system callilng for water -- no...

Check to see if you are getting 24 volts from the transformer, if not, turn off power to the transformer and check the resistance of the secondary side, if no resistance the transformer is bad and need to be replaced. Also check to make sure all the wires are secure. If you are getting voltage at the transformer then bring power directly from transformer directly to solenoid valve and it should click open and let the water through, if it does then either the sailswitch/current sensing relay is bad or humidistat is bad.

Jan 17, 2011 | Aprilaire 400 Humidifier

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Whats a sail switch

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. :-)

May 11, 2010 | Aprilaire 550 Humidifier

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