Heating Help

Auto Radiant Heat

                 Hi,

                 I will start by explaining my system setup, then explain the issue. I have a Buderus GA124 gas fired boiler, that is hooked up to a Buderus Logamatic 2107 controller, which is tied into an automatic valve that feeds a watts radiant heat 6 loop manifold. My problem is, when the temp outside drops below 32F, the radiant heat kicks on automatically. I can go and close the valve that is on the manifold, but the Buderus Logamatic sensing that it is cold outside, will kick it back on within a day. I have a thermostat in the main room where the radiant heat is (set to 59). All the thermostats in the house (3; 1 radiant; 2 forced hot air) are fed into a Taco relay controller. What I want to do is set the Logamatic, so I can control the radiant heat and not have it on automatic. Does anyone know how I would go about it? I included a pic of the automatic valve. Thanks