Amana ASZ14 outside and a Goodman AEPF4260 air handler. I recently replaced the t-stat but it appears that the old one (Honeywell) was never set up for two stage operation and neither is the new one (Sensi).
From what I've been reading, I have two heat stages and two cooling stages and I need more than six t-stat wires to be fully functional - yet that's all I have connected (including the C wire).
Looking at the air handler control module, Y1, Y2, W1, and W2 all have connections. But Y2 and W2 are definitely not connected over at the stat... I have yet to trace the wires.
Any thoughts? PDFs depicting a configuration example?
Edit: imgur album... https://imgur.com/a/1Y7Q0
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