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silversport 02-04-2012 03:06 PM

Installing VisionPro IAQ - need help
Hi - my deisre to install a whole house humidifier and monitor/adjust RH from the thermostat snowballed into buying a Honeywell VisionPro IAQ thermostat. Overkill but I hope to grow into it. I am having trouble with the wiring. Current system:

Goodman SSZ14 heatpump
Goodman AEPF Air Handler
Honeywell Chronotherm III t-stat with manual heat/cool changeover (circa 1991)

Current system is wired as follows (first photo) and doesn't follow any of the diagrams I have. Trying to figure out how to wire it correctly and looking for advice. Second photo is the diagram I think I should be working from. Thanks! and I apologize for the crude drawing.

hvactech126 02-04-2012 04:25 PM

What make and model humidifier are you installing? Do you also want dehumidification with air conditioning enabled?

silversport 02-04-2012 04:37 PM

I can't thank you enough. Humidifier is an AprilAire 600. No plans for dehumidification right now.

Can you provide insight into the to current wiring? Just to satisfy my own curiosity?


hvactech126 02-04-2012 04:43 PM

current wiring is for the current thermostat requirements and its internal operation. New thermostat uses different internal operation.

silversport 02-04-2012 05:01 PM

Geez, I think I just realized what was confusing me. Lower left of my hand-drawn looks to have four wires (Y1, YCON, O, W2) jumped together. They are actually bundled at the end with electrical tape. I was thinking that was lazy work but now realize it's likely unused wires bundled together. That really clears this up.

Thanks again for the assistance.

silversport 02-07-2012 05:56 PM

The AprilAire 600 humidifier came with a 24V transformer but I assume it's okay to tap into the AH's existing 24V transformer?

hvactech126 02-07-2012 06:25 PM

I prefer to have the humidifier on it's own circuit. The reason for this is so that if the humidifier circuit were to fail due to a bad wire or failed solenoid valve it would not cause the heat or air to not work as well.

silversport 02-11-2012 10:47 PM

New IAQ and humidifier installed; and everything is working. Thanks again for the assistance. I was working within the confines of a previously-installed humidifier (location and bypass routing).

hvactech126 02-12-2012 10:27 AM

glad you got it going! Good job

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