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Old 12-14-2010, 08:41 PM   #1
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Armstrong furnace how to wire humidifier


I want to hook up a humidifier to my armstrong furnace, I don't know how to wire directly to the 24volt terminals in the furnace, so that when the heat kicks on, so does the humidifier. Can anyone help me out?
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Old 12-15-2010, 06:45 PM   #2
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Armstrong furnace how to wire humidifier


what humidifier do you have brand and model number? can you take a picture of the control board?

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Old 12-15-2010, 08:40 PM   #3
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Armstrong furnace how to wire humidifier


Wire it to the G terminal so it comes on with the blower. http://geothermal-pa.com
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Old 12-16-2010, 06:20 AM   #4
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Armstrong furnace how to wire humidifier


My furnace is an Armstrong
Model EFC20LAA-1A
Serial No. 6005H19337
Voltage 240/208

Honeywell HE225DG115 TRUE IAQ By-pass Humidifier


The pics of the wiring schematic is on my first post in this thread. Thanks for all your help. DW
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Old 12-16-2010, 08:23 PM   #5
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Armstrong furnace how to wire humidifier


http://www.alpinehomeair.com/related...de%2001.10.pdf

see page 11
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Old 12-16-2010, 08:50 PM   #6
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Armstrong furnace how to wire humidifier


Thanks for the manual. I looked inside the furnace, but can't determine where the 24v connection would be. Do you know if this humidifier will turn on and off when the furnace turns on and off, if I have it plugged in to a 120 wall outlet separate from the furnace? Thanks
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Old 12-16-2010, 09:30 PM   #7
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Armstrong furnace how to wire humidifier


it would be on the control board located in the blower compartment. the model number of hum that you gave me was for a bypass unit. It should not need 120v other than for the transformer.
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Old 12-17-2010, 06:20 AM   #8
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Armstrong furnace how to wire humidifier


Quote:
Originally Posted by hvactech126 View Post
it would be on the control board located in the blower compartment. the model number of hum that you gave me was for a bypass unit. It should not need 120v other than for the transformer.
I am figuring if I can't hook it directly to the furnace board I will use an outlet to plug it in. Is there anywhere I can get a picture or schematic of the location of the 24V transformer? Thanks again for helping.
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Old 12-17-2010, 07:24 AM   #9
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Armstrong furnace how to wire humidifier


Quote:
Originally Posted by doublewide6 View Post
I am figuring if I can't hook it directly to the furnace board I will use an outlet to plug it in. Is there anywhere I can get a picture or schematic of the location of the 24V transformer? Thanks again for helping.
there should be two terminals on the board one labeled HUM H and one labeled EAC H ....if you have hum on board then use that for the hot leg of the high voltage side of the transformer and take your other leg (common to a neutral post on the control board. If you don't have HUM then you can use EAC
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Old 12-17-2010, 09:43 AM   #10
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Armstrong furnace how to wire humidifier


hvactech,

I really appreciate your effort and help in this matter. I'm pretty good with home wiring and repairs, so I think I can handle this. I am going to go home and try to locate the terminals you are speaking of. I might post a picture or a video for you to check out if I can't find the exact terminals you are speaking of. Once again I will keep you posted and I appreciate you taking the time to help me. Thanks DW
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Old 12-17-2010, 05:16 PM   #11
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Armstrong furnace how to wire humidifier


HVACtech,

This is a video I was not able to find any HUM H or EAC H Neither are on the wiring diagram. Please take the time to see the video and let me know what you think. Thanks again for your needed help. DW

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Old 12-17-2010, 05:31 PM   #12
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Armstrong furnace how to wire humidifier


do you have a heat pump? If you do then please tell me what terminal designations are in your t-stat.
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Last edited by hvactech126; 12-17-2010 at 06:44 PM.
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Old 12-17-2010, 07:23 PM   #13
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Armstrong furnace how to wire humidifier


Thermostat Indoor Unit Outdoor Unit
Red Red Red
Yellow wire nutted Yellow
Orange wire nutted Orange
White Black + White +Brown White *************edited**************
Green Green ------
Blue Blue Blue

These are the wire nuts on the outside of the furnace that connect the thermostat to the furnace + the heat pump.

I do have a heat pump. Here is how it is wired up. The Thermostat and outdoor unit have 20 gauge wire and the indoor furnace has 14 gauge tied together with wire nuts.

The following is what I found behind the Thermostat:

W2 White
G Green
B ------
O Orange
Y Yellow
R Red
C Blue
E Black

Last edited by doublewide6; 12-17-2010 at 08:10 PM.
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Old 12-17-2010, 07:32 PM   #14
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Armstrong furnace how to wire humidifier


Do you have any extra wires going to thermostat from air handler? If you do hook it to B...
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Armstrong furnace how to wire humidifier-air-handler-iaq-humidifier.jpg  
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Old 12-17-2010, 07:57 PM   #15
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Armstrong furnace how to wire humidifier


Thanks for the quick response.

All wires going from the thermostat terminals do wire nut to the indoor unit. However there is one extra wire not in use. It is a brown 20 gauge wire it runs from the thermostat to the furnace, but not connected on either end.

********* I edited posting #13 please see the wiring correction****************


Last edited by doublewide6; 12-17-2010 at 08:11 PM.
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