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How do I wire in my new humidistat to the older thermostat?

Humidistat: Honeywell H46C Thermostat: White-Rodgers 1F86-344

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Posted on Jan 02, 2017

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SOURCE: FROM A CONDO IN FL WITH HEAT PUMP---I HAVE A

I think what he was looking for is a humidistat control that will by pass your thermoneter on his air conditioner and turn off & on by the humidity in the building. I also am looking for the same. Harley

Posted on Mar 31, 2010

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Suggest you people READ the question before giving BS answers !!!!!!!!!!

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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...

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Humiditstat control


Hello harley,Easiest way do is Replace thermostat with a model that has humitistat functiion.Honeywell has a nice one.Adding a seprate control is complicated & sometimes cant be done at all

Mar 31, 2010 | Honeywell Power Humidifier: Furnace...

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FROM A CONDO IN FL WITH HEAT PUMP---I HAVE A WHITE-ROGERS THERMOSTAT (2 STAGE HEAT-1 COOL) AND WANT TO WIRE IN A HONEYWELL H46C HUMIDISTAT FOR HUMIDITY CONTROL. THERMOSTAT HAS THE FOLLOWING WIRE POSTS E O...


It's a little unusual to add a humidifier in Florida. The ambient humidity is usually high enough.

But anyway, if you want to do this and assuming you have central air with forced air heating, you could install the humdifier in a standard configuration, then use a sail switch or differential pressure switch in the supply air duct to turn the humidifier off or on when you are in the heating mode only. The sail or differential switch will ensure that the unit can't run unless air is moving and you can tie the humidistat in to the first heat stage.

Mar 05, 2010 | Honeywell Power Humidifier: Furnace...

1 Answer

I have a Honeywell House humidifier HE 225A-1006.


In order of probability:
1) (incorrect wiring) Make sure that humidistat is in SERIES wired with the furnace.
2) (shorted wires) Check that two wires to humidistat are not touching...use your glasses if you need them!
3) (bad humidistat) disconnect the humidistat and put an ohmmeter accoss the two terminals when it is turned on you should read 0 ohms, and when off it should read infinate ohms, if not pass both these tests, you need new humidistat.
That is it, there are no other possibilites!

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Wiring Honeywell TrueIAQ w/ a non-powered Honeywell humidifier


the soliniod requires 24v to open so if you dont have the power then its not wire properly. Are you using a current sensing relay to allow the humidifier to only come on whe the fan is operatin? if you do have 24v on solinoid and its not opening then you got a bad solinoid. sometimes the humidistat will be a universal, for a power humidifier . A bypass requires external power and the humidistat will need to be switched to BYPASS to regonize this

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1 Answer

Wiring issue with the Honeywell HE360A Humidifier


Maybe I can help. this is 24v so it doestn't matter which wire goes where so here goes. 2 wires from humidistat go to furnace, split one of the wires(not both) so they reach the yellow wires on the humidifier. with marettsconnect one of the split wires to one of the yellow wires. do the same to the other split wire and yellow wire. what you should get is one wire from humidistat to furnace then one wire from humidifier to humidistat and one from humidifier to furnace. hope this helps

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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

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Humidistat installation question


I suppose you are looking at the do-it-yourself model. Depending on the wire that is run up to you Regular Thermostat from your furnace. You may have to run a seperate line for the Humidistat. A digital thermostat that does Humidity and Temperature is recommended. Or you could just place a Humidistat near the furnace room. A wiring diagram will come with the Humidifier discribing the different ways to wire it.

Jan 09, 2009 | Honeywell Power Humidifier: Furnace...

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

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