I have found this on the picture but from this thread below
http://www.uk420.com/boards/index.php?/topic/343958-str-15astc-1000-how-to-connect/&
seem interesting tho I don't understand what means at the very end swap to the orange does understand?
It might not be able to be done then i was hoping that a thermostat would be able be wired in somewhere so guessing id just be able to use it manually then