My new property (2006) has underfloor heating controlled by a Raychem TC timer thermostat. I have downloaded the user instructions, but to program it in the user mode (U1) is somewhat unclear as it says 'Select the desired time with the +/- buttons'. But it doesn't say the 'On' time or the 'Off' time and consequently I can' fathom out how to program the thing! Any one out there can help?