im in the last stages of retro fitting a radiant floor system with snow melt. this is my first shot at this kind of system. im using a taco radiant mixing block for the floor heat, and also for the snow melt. ive installed both RMB's, and have a heat exchanger with the snow melt RMB. there is an existing tekmar 090 snow/ice sensor installed in the exterior concrete sidewalk. a tekmar rep has told me that i cannot use the 090 sensor to signal the RMB for a call for heat. the 090 sensor uses two 10K ohm sensors. does anyone know how i can combine these two signals to actuate the RMB for the snowmelt system? any help from any snowmelt experts is greatly appreciated.