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Switching 24v Thermostat Power with Sonoff SV

Hi all, I'm trying to hookup a sonoff to switch power on/off to a set of thermostats in my radiant floor heating system.  The power supply is a 24v supply thus my trying to do this with a Sonoff SV.  The power supply is here:

http://www.packardonline.com/Shop/PrintProduct/5735


I've attached a picture of how I wired this up, positive (red) to in+.  When I plugged it in the resistors below the input blew/popped.


Did I wire it incorrectly or should I be using a Sonoff Basic?

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