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Posted on Feb 08, 2013

How to wire the humidistat to the transformer

I have a standalone aprilaire 360 humidifier. The unit runs on 110V and there are connectins off the side for the humidistat to be wired into it. It runs off of a 24 v transformer, I have a transformer already I can tie into. Question: What is the correct way to wire the unit to the humidistat and transformer?

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dustin358

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  • Posted on Jan 05, 2014
dustin358
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Your transformer should have multiple wires on it. 2 of them are for 120 volt side hook up usually black is your hot 120 v wire and white is the common or neutral wire. on the other side of the transformer you have 2 more wires these are your low 24v side colors can range from red,green, blue, yellow ect. the wires for 24v dont matter about polarity or which one you hook up. one is 24v and the other is common.

5 Related Answers

mrgrzz

Dale Koehn

  • 88 Answers
  • Posted on Jan 20, 2009

SOURCE: 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

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Anonymous

  • 8 Answers
  • Posted on Feb 04, 2009

SOURCE: 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

Anonymous

  • 11 Answers
  • Posted on Feb 09, 2009

SOURCE: No water to my Aprilair model 550.

Some sump pump have a safty switch that will not let the hum. come on if the tank is full of water, I,m not sure if this is the type that you have but make sure that the pump is pumping water. Also your humidistat have an internal switch that it should be set to bypass not to power Note: some humidifier have their own power supply the 550 dose not

Anonymous

  • 661 Answers
  • Posted on Apr 04, 2010

SOURCE: Humidifier will not turn on (no fan, no water flow)

Not good. sounds like it blew a fuse. You will have to either find the fuse or have ti replaced.

Anonymous

  • 43501 Answers
  • Posted on Jan 24, 2011

SOURCE: This regards an Apriaire 700 that was installed

Hi,

You are absolutely thinking correctly....the humidifier should be running when ever the blower is running and the humidistat is not satisfied...in fact in some cases I have advised people even turn the fan switch on to run the blower longer to get more humidity in the air if needed....some furnaces do not have long enough run times to get enough water evaporated...

You have the idea of how it needs to go, so you should just go ahead and wire it up that way and you'll be glad you did!! You can get a relay for a few bucks and have a much better working system...


heatman101

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Hello, in order to turn your humidifier on with the furnace the 120 volts coming from your humidifer you must hook it up to a step down transformer, then the transformer will provide 24 volts to you humidistat and solenoid valve. So you need a wire from the HUM on your control board to transformer primary side and a wire from neutral on the board to primary side of transformer. Then you need low voltage wire from secondary side of transformer to humidistat from humidistat to humidifier.
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Hello, make sure you are getting 24 volts at the transformer, if not turn off power to transformer and check resistance on the secondary side of transformer, you should have resistance if not replace transformer. If you have 24 volts at transformer than check the wiring and make sure it is tight. the last thing to check is to make sure you are getting 24 volts in and out of the humidistat. if you are not replace humidistat.
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The system is 24 volt AC so start by checking the voltage from the transformer to make sure it is approximately 24 volts AC. The current will flow through the humidistat when continuity is made at the control as the humidistat senses that your house needs moisture. Disconnect the wires from the himidistat and set it to a high level, you should hear a click on the way up. With the 24 volt wires disconnected, check for continuity with a volt meter. If you don't have continuity replace it. Current also flows through an inductive sensor switch that hang on a wire from the blower. When the blower wire has current flowing through it, the switch senses that an closes makin the connection. With both wires disconnected from the 24 volts you can test for continuity when the blower is running. Overall, this is a continuous circle of wiring and is not directional like DC so think of the wiring a a big loop. The correct current has to flow through the transformer, through the humidistat, through the blower switch, through the solenoid completing the the circle before the solenoid will activate. Hope this helps.
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If you don't have a volt meter, purchase one. I've seen them as low as $20.00 at Sears and even lower at Home Depot and other discount stores. The HUM terminals are most likely low voltage (24v). The "N" is the neutral. Assuming you have confirmed this is low voltage (24v, you will use HUM and "N" terminals. This control sequence is typically to allow for operation of your humidifier only when there is a call for your fan to run. The brown wires coming from your Humidifier are your low voltage circuit. One should be directly wired to "N". The other should be ran to your humidistat. The other side of the switch of your humidistat should be wired to the HUM terminal.
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