How do I wire a whole house humidifier to my furnace

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Old 05-13-14, 12:14 PM
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How do I wire a whole house humidifier to my furnace

My whole house humidifier wired the way that it starts supplying mist when thermostat calls for heat. How do I rewire it to start when the blower starts (90 seconds after thermostat calls for heat)? Furnace model is Bryant / Carrier 394GAW048100.
 
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Old 05-13-14, 04:42 PM
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Welcome to the forums.

What is the make and model of your humidifier and are you using an electronic digital readout humidistat or a mechanical turn knob analog style ?

Your Carrier board has provisions for 120vac control of an electronic air cleaner. That circuit turns on with the blower. You could connect a 120vac > 24vac transformer at those terminals for humidifier power.
 
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Old 05-13-14, 05:59 PM
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PJmax, thanks for reply. The make is herrmidifier but I am not sure about model. It has analog style know (see pic). Currently it is connected between contacts C (white wire to the knob) and W (red wire to solenoid). I wonder if I can use any 24VAC contact without a transformer.
 
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Old 05-13-14, 06:03 PM
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Technically wiring to the C and W terminal is not correct. In your application I would install a small 24vac 20va transformer and connect the 120vac lines to EAC1 and EAC2. Then move the red and white wires to the 24vac terminals of the transformer.
 
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Old 05-19-14, 11:20 AM
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got a transformer and wired it the way you suggested. Works! Thanks again for helping
 
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Old 05-19-14, 11:37 PM
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You're welcome........ Good job
 
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