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How do I wire a whole house humidifier to my furnace?

My whole house humidifier wired the way that it starts supplying mist when thermostat calls for heat. How do I rewire it to start when the blower starts (90 seconds after thermostat calls for heat)?

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You could wire the Humidifier to the HUM terminal on the Furnace integrated control board, this would allow the humidifier to start only when the blower motor energizes.

Posted on May 15, 2014

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bmatsson
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SOURCE: Furnace blower won't turn on

You may need to replace the sail switch. It senses the fan speed and when it connects the gas valve should open and furnace should fire up.

Posted on Dec 09, 2013

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Built-in humidifier just stopped working. Any ideas how to fix?


Troubleshoot and Repair a furnace mounted Humidifier

www.instructables.com/.../Troubleshoot-and-Repair-a-furna...

InstructablesThis instructable will explain how to diagnose and, hopefully, repair a broken humidifier... While my humidifier was an Aprilaire 700 model humidifier, I would still expect ...Does it just take several on/off cycles of the furnace to finally stabilize?

Amazon.com: Customer Reviews: Honeywell Easy to Care ...

www.amazon.com/...Humidifier.../B00464E7VE

Amazon.com, Inc.Honeywell Easy to Care Cool Mist Humidifier, HCM-750. byHoneywell .... It does have a light built in, that shines through the falling water, and onto the ceiling. The primary.... It worked fine for a couple nights, then randomly stopped working.

Whole House Humidifier Troubleshooting - YouTube

? 2:42
https://www.youtube.com/watch?v=piKVU3JLQwg
Aug 23, 2009 - Uploaded by ntsupply
This video offers practical tips for troubleshooting whole house(furnace mount) humidifiers from Aprilaire ...

How to Fix a Humidifier ' HomeTips



Feb 03, 2016 | Heating & Cooling

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...

2 Answers

We just bought a home with this humidifier installed on the furnace. There's no activity when the furnace is running. The water is connected but does not flow. Could this be a transformer problem? We guess...


Could be a couple of things. Transformer can be bad. Try connecting the two wires (usually wired red and white) from the transformer to terminal W and C on the circut board. Your bypassing the transformer and if installed a current sensing relay. The furnace transformer will/should handle the extra load. Turn on the furnace, if still not working, loosen the water supply line at the water solenoid on the humidifier, if water flows out then your supply valve isn't clogged, if no water then try screwing in the needle on the supply valve all the way in then back out. If still no water then the valve is clogged. If all is good then it looks like the water solenoid is bad or wiring to valve/humidifier control. Don't find the controls bad that often. Have fun!

Nov 28, 2009 | Honeywell HE260A1010 Whole House...

1 Answer

How do i hook up my humidifier using a seperate transformer


If you chose to install this with an auxilary transformer. Turn the main power off to the furnace. Mount the transformer on the handi box to the furnace or inside the furnace cabinet. Wire the primary wires from the transformer to the main power coming into the furnace. Connect black to black and white to white. Wire the secondary side of the transformer in "series" with a #50 relay, the humidistat, the solenoid valve and back to the transformer. Determine which wire powers the blower motor for the heating speed. Clamp the #50 relay to the wire.
Good luck
HVAC Teacher

Feb 22, 2009 | Honeywell HE260A1010 Whole House...

1 Answer

The water supply will not turn while furnace is off


24v ac cyliniod on the water line, probably mineral deposits or just went bad, it gets its power from the terminal board on newer units have a humidifier output on them, check there to.

Feb 03, 2009 | Honeywell HE260A1010 Whole House...

1 Answer

Water keeps running to Honewell 360A Whole House Humidifier


You may need to replace the valve that is wired to the furnace that controls the water flow

Feb 01, 2009 | Honeywell HE360A1027 Whole House...

1 Answer

HE220A direct wiring to protech 62-24084 control board


it is best to use a seperate transformer for the hummidifier, but in some cases you can use the low voltage t-stat wire that runs your furnace, you will need to have one wire run to common, and the other to the heating side of your low voltage, normally its the red wire hooked to the w circuit of your terminal board, if you do decide to go with an extra transformer, make sure you you have it wired to bring on the humidifier only when the unit calls for heat, hope that helps

Jan 19, 2009 | Honeywell HE260A1010 Whole House...

1 Answer

Looks like my humidistat calls for coil fan and for furnace heat


It sounds like the humidifier may be improperly wired.
It's hard to solve without checking the wiring, but it seems like the humidistat is wired so that as the dial is advanced, it incorrectly turns on the fan, or furnace, or both.  The contacts of the humidistat should be wired so that they turn on the solenoid only.  Also, the power to the humidistat, to turn on the solenoid, should come on only when the fan is on.
Hope this helps!

Jan 03, 2009 | Aprilaire 550 Humidifier

1 Answer

Wiring problem


Sounds like you may have put 120v through a 24v solenoid and humidistat.
Is the HUM terminal on the furnace 120v or 24v?
If it is a 120v terminal you will need a 120x24v transformer and a new solenoid and maybe a new humidistat.

Dec 19, 2007 | Honeywell HE360A1027 Whole House...

1 Answer

Installation problem


I WOULD CHECK TO SEE IF YOU HAVE ENOUGH V/A OUT-PUT ON TRANSFORMER. I DONT KNOW IF YOURS CAME WITH ITS OWN TRANSFORMER. IF IT DIDNT YOU SHOULD HAVE A MINIMUM OF A 40 V/A RATING STAMPED OR PRINTED ON THE EXISTING TRANSFORMER. IF THE TRANSFORMER IS EXTREAMLY HOT ... YOU MAY NEED A 75 V/A TRANSFORMER WITH THE SAME VOLTAGES. INCREASING THE V/A CANNOT DAMMAGE ANYTHING IT JUST GIVES YOU MORE POWER WHEN EXCESIVE CONTROLS AND WIRING ARE ADDED TO A HVAC LOW-VOLAGE (24v) CIRCUIT. IF YOU LIKE YOU CAN CALL ME AT 727-363-7071. I AM A RETIRED HVAC&R CONTRACTOR WITH 45 YEARS EXPERIENCE. I HATE THE NEW SENSORS THEY HAVE TO ACTIVATE THESE NEW HUMIDIFIERS. I USE TO WIRE THE HUMIDIFIER TRANSFORMER (SUPPLIED WITH HUMIDIFIER) TO THE LINE (110V) SIDE TO THE LOW SPEED ON YOUR BLOWER MOTOR. THAT WAY THE ONLY THING THAT INTERUPTS THE CICUIT IS THE HUMIDISTAT. YOU NEVER WANT THE HUMIDIFIER TO RUN IF YOUR SYSTEM IS NOT "CALLING FOR HEAT". NEVER TRY TO ENERGIZE THE WATER SOLENOID THROUGH YOUR HEAT WIRE(USUALLY SMALL THE WHITE WIRE) FROM THE THERMOSTAT. THIS WILL RESULT IN BURNING YOUR HEAT ANTICIPATOR OUT ON THE T-STAT.

Jan 28, 2007 | Honeywell HE360A1027 Whole House...

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