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How do I wire an in-line duct fan directly to my furnace so that it runs when my furnace runs?

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Tie the power from the larger room air blower to the duct fan. There may be a few other wires that energize when the blower starts that are there to change your blower speeds. The easy way is to use one of them to power the new fan.

Posted on Feb 07, 2010


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Mid efficient Carrier furnace that wont stop running.

I am assuming for the first explanation, the thermostat is not being satisfied. If this is the case, you may have a duct fallen off and is not heating the interior of the home. I have had several supply ducts fallen off the supply under homes in one subdivision because the original installers only duct taped the supply ducting to the headers and the duct just blew off. This happens more often than I would like to mention in attics spaces also. So if the thermostat is not satisfied look for major leaks.
2nd part, you may need to replace the themostat wire if the wires are shorting out. In particular the white wire is the normal color for thermostat for w connection for furnace control. If a white wire is shorting to any control wire that has 24 volts on it, like the green wire for the fan, red wire for the control voltage to most controls etc, the furnace will run continuously as long as the furnace is getting the voltage on the white wire. To check this out, turn the thermostat to off and check the voltage on the white wire to common. If 26 volts is present, the wire is shorting somewhere and the thermostat wire that is damaged needs to be replaced. I have seen pets, rodents, lawn mower blade damage, bad insulation problems and overdrawing components causing theromostat wire deterioration.
3rd possibility, is remote due to the unit has been installed for 10 years, but if recent addtions were made to home, the unit may not produce enough heat to heat the additional demands of added rooms. In particular, this winter has been really cold in some locals and the unit may just be undersized.
Hope this helps

Feb 05, 2015 | Heating & Cooling


How to Install a New Furnace Yourself

<span style="font-weight: bold;">Installing a new furnace</span> can be done by a good handy type homeowner. There are a few things that you will need to know. I will not be able to convey everything that I know in an article such as this, but I will attempt to give the important things that will help the<span style="font-weight: bold;"> handy person</span> to be able to overcome some of the major hurdles that may be encountered when <span style="font-weight: bold;">changing a furnace.</span><br /><br />The first thing you want to do when <span style="font-weight: bold;">changing out your furnace</span> is to research different new models. Do not assume that you need to same BTU furnace as you have. You may be much better off with a <span style="font-weight: bold;">smaller furnace</span>, especially if you are changing out an older <span style="font-weight: bold;">inefficient furnace</span> with a <span style="font-weight: bold;">higher efficiency</span> model. Also check that the dimensions of the new furnace will allow it to fit into the same space, and adapt to the existing <span style="font-weight: bold;">supply and return duct work.</span><br /><br />Next you will have to remove the <span style="font-weight: bold;">old furnace</span>. When you do this make sure to carefully plan for the installation of the <span style="font-weight: bold;">new furnace</span>. By doing some careful planning you can make the hookup of the new furnace much easier. Do not take apart more then is necessary to remove to old furnace. Then position the new furnace to take advantage of as much of the existing parts from the old furnace as possible.<br /><br />Remove the <span style="font-weight: bold;">electrical supply</span> and the <span style="font-weight: bold;">gas or oil lines.</span> Then carefully take apart the supply and return duct work. Many times the return duct work can simply be reattached to the new furnace after cutting the appropriate hole into the side of the furnace. As long as you do not have <span style="font-weight: bold;">air conditioning</span> on your furnace you can often just strap up the supply duct-work temporarily to the ceiling and hold it there till you can get the new furnace under it again. Many new furnaces are not as tall as the old ones, so you will either need to block up the furnace and shorten the return duct, or you will have to attach it to the existing duct work and then support the supply duct and build new duct to go up to the old supply. Duct-board material is easy to work with and will work well for doing this.<br /><br />If you have air conditioning on you system you can often support the indoor coil along with the duct-work and just make the swap underneath it. If you cannot do that then you will need to get a professional to help you so that you can pump down and recharge the system. That process takes a <span style="font-weight: bold;">special license</span> and special equipment to get the job done.<br /><br />Now that you have everything removed from the furnace and marked so you know how it goes back together, you can slide the new furnace in place. I usually start by hooking up the supply duct, then the return duct. Once these two major things are in place then the <span style="font-weight: bold;">gas line</span> and wiring can be installed to the new furnace. I usually make sure to use an approve <span style="font-weight: bold;">flexible gas line</span> so that the piping part is easier. Often the <span style="font-weight: bold;">electrical lines</span> will fit to the new furnace, however if not then changing the wires is really not that hard.<br /><br />Also <span style="font-weight: bold;">MAKE SURE</span> to keep the manufacturer directions!!! Inside the <span style="font-weight: bold;">installation manual</span> there are very clear<span style="font-weight: bold;"> installation instructions.</span> Make sure to follow all of the directions exactly. There also are instructions for the <span style="font-weight: bold;">start up</span> of the furnace in there, those instructions will help you through the <span style="font-weight: bold;">start up and check procedures</span>. <span>Make sure to keep the installation manual for future reference</span>. There are also<span style="font-weight: bold;"> troubleshooting</span> procedures and <span style="font-weight: bold;">flow charts</span> in there that will make <span style="font-weight: bold;">troubleshooting a problem</span> in the future much easier.<br /><br />After over twenty years of <span style="font-weight: bold;">installing furnaces</span> I still get out the installation manual and read it, as they are always changing things that are needed for <span style="font-weight: bold;">proper operation.</span> However after these many years I also have been able to trim the time down to less then a day for some installations and usually always less then two days for even a difficult one. Your time will be more then that, but with some planning ahead and creating lists of the<span style="font-weight: bold;"> materials and tools</span> needed you can still get the job done well and in a respectable amount of time. Or you may choose to have some else do it for you....

on Feb 22, 2011 | Heating & Cooling

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We have a Coleman Electric Furnace Serial # AOL6042086, Model # AHP36C3XH21A and the fan runs constantly, will not shut off. We have replaced the thermostat and just replaced the control board. We h

I wish I was a furnace expert but I will give a push in the right direction. When a gas/electric fan runs it has two speeds. When you turn on the FAN ON switch it should run at the slower speed. If it doesn't turn on or turn off again when you turn it back you have a wiring problem or a thermostat problem. Make sure the thermostat is compatible with your unit and wired properly (on both ends). The other time the fan runs is "in session" when heat or cooling is applied to the system. It should run until the system finishes the cycle then a bit more (30 seconds or 1 minute) to blow the treated air completely through the ducts. If it doesn't stop then you may have a bad fan time delay or relay. Check parts for your model and various appliance repair site online.

Nov 25, 2014 | Coleman Mobile Modular Home Electric...

1 Answer

Pleasureway Traverse furnace fan runs when funace is off.

Bad/ stuck fan relay or temerature sensor is not shutting the fan off. Or there is a short on the low voltage fan control circuit. Check to see if the Green terminal is jumpered to the Red terminal at either the furnace control board of the 'stat, if not, ohm the wires with both ends off- I've seen installers accidently shoot a staple thru the wire and short the wires together more often than even I can believe! Hope this Helps! PS Some furnaces have fan switches inside the furnace- check for one and see if it's "on"- sounds too simple, but sometimes the "simplest" is the correct answer.

Mar 22, 2013 | Heating & Cooling

1 Answer

Furnace fan will not run manually or otherwise

Check motor winding resistance (line to line and line to body). If this is okay, check if the wires are cut or disconnected to the terminals. If wires and connections are okay, replace the capacitor.

Nov 12, 2012 | American Standard Trane Ge Gas Furnace...

1 Answer

I just purchased my 3M 16x25x1 air filter, i do not get what the filter should point to, toward the furnace or toward or toward the duct work

There is an arrow on the filter indicating the direction of air flow. The arrow should point toward the ductwork as that is the direction the air flows from the furnace fan.


Feb 02, 2011 | Heating & Cooling

1 Answer

Aprilaire 600 humidier: water continuously runs

sounds like you may have it wired to a continuous power source vs one that shuts off with the furnace. The most common wiring is red to C & white to W

Jan 08, 2010 | Aprilaire 600 Humidifier

1 Answer

Honeywell HE260 leaks somewhere

Neither, even if the solenoid or humidistat stick, it should always drain properly. Is the unit mounted on the cold air return duct or the supply plenum? If it's mounted on the supply plenum, the water panel might be getting blown forward and spilling the water. High efficient furnaces also can leak water on the floor if its drain is restricted. If hum. is mounted on return duct make sure drain is clear by blowing through it. On Honeywell hum's I've seen the rubber hose from the solenoid valve to the distributor tray leak too, check the rubber 1/4" hose.

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

2 Answers

My AC unit wont blow the cold air.

if the ac outside is working, but not the furnace, means there is a control problem with the furnace, check wires in the furnace, make sure there is a blower wire plugged into the contact marked cool on the control panel of the furnace

Jul 09, 2009 | Fedders A&B Chassis A1A07W2B Air...

1 Answer

HE220A1019 Whole House Humidifier

Is the unit on the return side or the supply side of your system ?
Is the system upflow or downflow?
You are right in your assumption about the air needing to be drawn through the Humidifier, now before changing the direction of the motor, we need to look at if the unit should be moved to the other duct, its alot less complicated, now when the fan comes on from the furnace, you have no trouble heating the house right ? if that is the case then moving the humidifier to the other duct would be your best bet, if your heating for some reason is only comming out of the return then yes you will need to change direction on the fan, but I would bet that moving it would do the trick for ya, I have only run into a couple of fans that actually were running the wrong way, thats why I asked, well anyways, you will need some tin, zip screws, tin snips, maybe a little more wire, let me know what ya find, I really appriciate your question back to me, anymore question please ask ! thanks again.

Jan 25, 2009 | Dryers

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