I’ve an Aprilaire 8400 series thermostat and I’m trying to wire up my Nest Learning Thermostat. There are 7 wires Red, Wht, Grn, Blk, Dk Blu, Brn, Yl, and Org. There are two jumpers. One from RC to R and another from W to W2. I can’t find any posts to help with my installation. I have a heat pump with aux heat. I’ve a photo of original wiring to old thermostat.
