can anyone help me with this thermostat, i know how to set the timer and turn on and off using temperatures but can you use this thermostat without the timer, ie i am going to work weekend and all my times are different from that of the week i would rather just use it as and when i wish i dont want to leave it on all day and just want to turn it on 'constant' when i am at home as i go to bed different times over weekend, it seems i can only use along with time settings, can anyone help?