Question about Honeywell HE360A1027 Whole House Humidifier Humidifier

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Wiring problem We are having a similiar problem-- wiring from HUM terminal on furnace to mechanical humidistat to humidifier to common terminal on furnace. Seems right. Everything worked at first, then the solenoid smoked a little and the humidifier stopped. Any insight?

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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.

Posted on Jan 02, 2009

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I have similar isssue with HE220 but in my case the water run through all ththe time, even when unplugged from the power outlet.
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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.

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http://www.appliancefactoryparts.com/humidifiers/helpcenter/breakdowns/honeywell/honeywell-he360a1027.html
A breakdown diagram of parts etc above.
http://www.appliancefactoryparts.com/content/pdfs/110672-4.pdf
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To me it sounds like it is wired incorrectly, the solenoid should NOT get too hot at all. The PDF above shows wiring data.

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1 Answer

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Yes you still need a transformer the hum. port on the furnace goes to the 24 volt transformer. one leg of the primary side goes to the transformer and the other leg of the primary goes to the neutral on the board. Then you have your 24 volt terminals one goes directly to the humidifier and the other goes to the humidistat the other wire from the humidifier goes to the humidistat.

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That will work, The HUM feeds power to the humidifier when the fan is operating even in cooling on most models, However the humidistat must also be calling for humidity and probally won't call during the cooling months

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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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Thanks for your question Mike,
The wiring for your humidistat and solenoid are fairly simple, you will need 24volt t-stat wire, you have the two wires at the Solenoid, one wire goes to the terminal board at the furnace, it connects to the (c) or common terminal, the other wire connects to one leg of the humidistat, run another wire from the other leg of the humidistat, to either the HUM terminal on your furnace circuit board, make sure its not a 120v leg, should say in the owners manual, if if is or your not sure, connect that same leg to the (w) terminal at the furnace, this way it only comes on in heating mode, some models need a second 120v-24v transformer, but you would still wire it through the same way, only exception is that you have to hook up 120v to the transformer, and route your wiring like I told you above but through the transformer to complete the circuit, hope that helped you out Mike, please let us know, thanks again, mr.grzz

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