"JH" wrote in message
...

"Set Square" wrote in message
...
In an earlier contribution to this discussion,
IMM wrote:


The CM67 is only
optimised on, in the morning period, so I believe.

This does not stack up with my experience! My CM67 is programmed to
provide
a lunchtime boost of 21 degC from 12:30 to 13:30 having been set back to
18
degC for the morning period. The boiler usually fires up just before 12
in
order to achieve the target temperature by 12:30. If you monitor the
target
temperature on the stat, it changes this from 18 to 21 at the point when
it
decides to fire up, rather than at the programmed time.


As some will remember, with the groups useful advice I fitted a CM67RF to
my existing system a few weeks back. It's transformed the level of control
and refinement compared to before (a TRV only system) but if like me you
are
new to these types of stat it does take a bit of mind set change to get
the
best out of programming the device e.g. one error I made was to set the
target temp time too early because I was thinking along the lines of
giving
the house a chance to warm up before getting up. The CM67 started the
system
up in the middle of the night. A bit of tweaking sorted that.out.

I've not changed the factory settings but like most tuning (bikes, cars,
IT
systems etc.) I'm going along the path of changing one user setting at a
time and checking the results over the next or so. I may move on the
factory
settings but I doubt it.

Jules

And I fitted one just after Jules (after tapping you lot up for info). It
has totally transformed our house. It feels comfortable ALL the time now!