Aprilaire 600M installation with no HUM terminal

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Old 01-18-17, 04:50 PM
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Aprilaire 600M installation with no HUM terminal

I recently purchased an Aprilaire 600M but I have been struggling to figure out how to wire it into my HVAC unit to only operate only on a call for heat. My air handler is a Trane 2/4TEC3F60B1000A and doesn't have HUM or EAC terminal, that I can find. Will I be relegated to ordering the current sensing relay for the blower or is there another way? I uploaded a pic of the main wiring box inside the air handler cabinet.
 
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Old 01-18-17, 05:06 PM
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Welcome to the forums.

There us usually not an EAC or HUM terminal on a heat pump system.
Your system can have two calls for heat. Just the heat pump or the electric heat coils.

You have a G green fan wire. You can use that to run the humidifier.
You would connect to the G wire and the B/C connection. The humidistat would be in one of the lines. You would have to turn the h'stat all the way down in the summer to keep the solenoid from being operated.
 
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Old 01-19-17, 12:01 PM
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Thanks Pete! I guess I should have mentioned it was a heat pump. I presume B/C would be ground to complete the 24v circuit?
 
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Old 01-19-17, 12:20 PM
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The blue wire on the terminal strip would be your common to the transformer.
 
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