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The chronotherm CM700 series are programmable room thermostat based on Resideo's proven CM20 programming philosophy. Designed with simplicity in mind, the CM707 features a clear backlit display and intuitive controls, making it easy to navigate and set your desired temperature. You maybe able to use the "grey wire that is folded behind" for this connection, but you need to find out first what it is connected to at the other end.

Some other thermostats also connect to the TRV heads, EvoHome and Wiser being two good examples, however these also have the option to fit an OpenTherm module and turn boiler up/down rather than on/off which is even better, Nest is odd one out in that does not need a module fitting all built in, but also has no link to TRV heads. You already have a live supply to the thermostat which you can link to the L, but you will also need a neutral for N.

This will also need wiring changes as right now, the wall thermostats control the opening of the valves. For example, they mention it's great for setting differing temperatures, and it'll give you more accurate control over the house temperature. The real beauty of this unit is that you can leave the heating time clock on 24hrs, and control the whole thing through this without faffing around changing time schedules.Fairly easy to programme - gives four different settings (temperature) a day at times to suit you - easy to repeat for repetitive days, or have separate settings daily as needed, eg weekends or regular early starts. I found with the Energenie TRV head the anti hysteresis software was OTT, and it takes a few hours to get to set temperature, I would cheat and set two degrees higher then wanted for first hour to counter this. I’m not an Engineer and so this is a DIY project for my own home so any advice in laymans terms would be extremely helpful.

They say it is a great product that allows them to set differing temperatures during the day and on different days. With over 15 years’ experience of bathroom fitting, coupled with over 10 years plumbing retail experience we are confident we can meet the needs of the most demanding projects. If you do use the PI function, leave it to self learn for a week or so before you change the temperatures and confuse it.What colour is used for what, would have been chosen by the original installer and varies from installation to installation. Wired or Wireless Wired Width 133 mm Voltage 24 V to 230 V Type Programmable Room Thermostat Timer Cycle 7 Days Height 88. To ensure proper operation of the programmable room thermostat, study user guide, presented in a convenient graphical format that contains 16 pages with useful information. If the item comes direct from a manufacturer, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag.