Wiring bypass humidifier to furnace

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Old 10-25-16, 04:06 PM
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Wiring bypass humidifier to furnace

I installed a bypass humidifier last season, and installed a receptacle for it. Iím upgrading my bathroom, and need the circuit.

I want to wire it so it only comes on when the heat turns on, not with the fan. The wife leaves the fan on all the time.

Itís a Honeywell HE120, came with a transformer - labeled ĎPrimary - 120VAC 60Hz; Secondary 24VAC 0.416A 10VAí each connects to the humidistat

The furnace is a Lennox Pulse, circa 1985. Below is the wiring diagram. Any help would be great!!

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Old 10-25-16, 05:43 PM
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What is the part number on that diagram ?
The board limits the size of the pics posted. There is not enough definition for me to help you.

Just curious.... when was the last time you had that furnace checked out ?
They've had major problems with the heat exchangers cracking. Some major recalls too.
It should be checked every year at its age.

Also.... a CO detector is a good investment too.
 
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Old 10-25-16, 06:52 PM
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I have a CO detector. HVAC guy suggested it when we had some new ducts/returns installed. He checked it out then. It was about 2-3 years ago.

Hereís a link for better photos, i hope

https://goo.gl/photos/TNacxfNN41aKPZeq5
 
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Old 10-25-16, 11:57 PM
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I would continue to use that transformer and a 24vac relay for control.
The relay would be controlled by the W terminal of the thermostat.
 
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Old 10-26-16, 12:11 AM
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I donít fully understand your response.

Is there a way to lose the transformer and power the humidifier from the furnace? Itís just a small motor that turns a drum.
 
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Old 10-26-16, 12:40 AM
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It wouldn't just be powered from the furnace. It would get it's 24vac from the furnace thru the thermostat. It's one way to wire a humidifier. Puts a heavier than normal load on the thermostat.

The diagram is the connection. Since it's 24vac.... there is no particular order.
W and C are where your thermostat wires connect to the furnace control board.

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Looking at your new pictures..... I see a custom relay sitting right next to the stat connections.
 
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Old 10-26-16, 06:12 AM
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There is no solenoid valve. It has a float that releases water. Just a small motor that turns the drum. I'm not trying to put any extra strain on my ancient system. I'm pretty sure my wife would rather have heat than humidity. Could this damage the system at all?

Which it the common terminal? Would it be the 'T'?
 

Last edited by MIdCityChef; 10-26-16 at 06:28 AM.
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