Help: Installing Lennox Power Humidifier to a Nest Thermostat (pic heavy)

Hi all, First post here. I posted this question on the Nest forums, and one wonderful person has helped me there, but I was hoping I could get some more opinions here since this seems a bit more active. This post is pic heavy! I'm setting up my nest to use with my Lennox HCWP3-18 power humidifier: Healthy Climate® Whole-Home Power Humidifier | Lennox Residential (http://www.lennox.com/products/indoor-air-quality-systems/HCWP18/) . I assume this humidifier is a "Stand Alone" type, since it is a power one, and from my understanding it operates independently of the furnace, since it has it's own fan. I would have gotten the pro to do it when they installed the humidifier, but they only support honeywell. Anyways, I have everything set up according to diagrams online, in this configuration: http://support-assets.nest.com/images/pro-faq/Stand-Alone-Hum-2-wire.png However, when I turn the system on, the relay just buzzes and heats up, and nothing happens. The solenoid does not activate.