Honewell CM927 programmable thermostat advice

jem16

Just had a Honeywell CM927 installed.

Looking for some advice on how people have set up their programmable thermostats. I know everyone's different but just looking for a starting point with times/temperatures.

jem16

So how does that work for having house at a decent temperature on getting up in the morning or coming in from work?

Farway

I do not have same item, but I programme mine to come on 30 mins or so before my normal getting up time, I use 16C, but you may want higher, depends on you

Goes off about two hours later before I normally leave the house [I manually override if going out earlier, or later]

Comes on about 30 mins before due back in, goes of about 30 mins before normal bedtime

manual override is always an option, as is bump up temperature as needs dictate

I have set one day to come on around midday as I am home that day

It really does depend upon your lifestyle, but I find it a boon, just set & forget for most part

Talldave

Farway wrote: »

I do not have same item, but I programme mine to come on 30 mins or so before my normal getting up time, I use 16C, but you may want higher, depends on you

The "30 mins before I want temp X" approach is exactly the kind of thing that the Honeywell is designed to prevent. It has optimum start, so you tell it what time you want the house at a certain temperature and it learns over the first few days how long it takes to warm up the house and gets it to that temp by that time.

I've had an older model of these fitted for many many years - best thing I ever fitted.

You leave the boiler controller (if you still have one) to enable the heating 24/7. Pick a night-time temperature, a daytime "out at work" temperature and an evening temperature - then programme up the days of the week with times/temps to match your lifestyle. If it goes freezing in the middle of the night in June or July, the heating will kick in to keep the house above your desired minimum temperature.

You'll never again need to do that incredibly British thing of deciding whether to have the heating on or off. You simply set the Honeywell to maintain the temps you feel comfortable with - and it does it 365 days a year.

If you take a day off, hit the day off button and it switches to Sunday's temperature sequence.

If you go on holiday, tell it how many days and it keeps a low temp maintained until the day you come back when it goes back to normal operation.

You won't regret getting one!!

jem16

Talldave wrote: »

The "30 mins before I want temp X" approach is exactly the kind of thing that the Honeywell is designed to prevent. It has optimum start, so you tell it what time you want the house at a certain temperature and it learns over the first few days how long it takes to warm up the house and gets it to that temp by that time.

Do you know if this only works for the morning start up time or does it work with the evening time too?

Pick a night-time temperature, a daytime "out at work" temperature and an evening temperature - then programme up the days of the week with times/temps to match your lifestyle. If it goes freezing in the middle of the night in June or July, the heating will kick in to keep the house above your desired minimum temperature.

I know it's individual preference but what temperatures have you chosen?

You won't regret getting one!!

I hope not.

At the moment I have not wall-mounted it and keeping it portable.

Is there a best place for location?

Pincher

Jesus, it's a little sky.net from Terminator!
That is just far too intelligent for its own good.

I much prefer a programer that goes on and off when I decide.
If I leave a few windows open for ventilation on a cold day,
it's going to come on without me knowing because it wants to prepare the house for some learnt behaviour that I don't understand. And waste gas.

Talldave

jem16 wrote: »

Do you know if this only works for the morning start up time or does it work with the evening time too?

I think it works out a speed of heating factor for your house and applies it to all settings.

When we had a really old creaky boiler, it had to start it off very early in the morning in order to reach our "getting out of bed" temperature. But when the boiler was replaced, it quickly adjusted itself to the much quicker heating times and came on a lot later.

Of course it could ideally do with knowing outside temperature as well for better accuracy, but again the optimum start feature compensates for the differences between winter and summer.

jem16 wrote: »

I know it's individual preference but what temperatures have you chosen?

My wife has circulation problems so the house has to be tropical!!
Night time is around 19, unoccupied daytime is 15, occupied daytime/evenings is 21.5.

jem16 wrote: »

At the moment I have not wall-mounted it and keeping it portable.

Is there a best place for location?

Ours is fixed in the hall - which provides a rough average for the house. Ideally, I'd like to be able to zone upstairs and downstairs separately and have two stats controlling the system, but that's not easy to do on a legacy installation. My ultimate solution is to fit radio TRVs to the rads and use a Honeywell Hometronic to control the lot - but that's a big investment!!

jem16

Pincher wrote: »

If I leave a few windows open for ventilation on a cold day, it's going to come on without me knowing because it wants to prepare the house for some learnt behaviour that I don't understand. And waste gas.

I think I'll try both ways until I see what I prefer.

My main interest is to stop the constant time alterations during autumn/spring when I found the heating coming on simply because it was timed rather than the house needed heat.

jem16

Talldave wrote: »

Ours is fixed in the hall - which provides a rough average for the house. Ideally, I'd like to be able to zone upstairs and downstairs separately and have two stats controlling the system, but that's not easy to do on a legacy installation. My ultimate solution is to fit radio TRVs to the rads and use a Honeywell Hometronic to control the lot - but that's a big investment!!

At least I don't need to think about that nowadays.

I'm the only one in the house now - just can't make my mind up whether to keep it beside me in the living room or stick it in the hall which is large and loses heat straight up the starirs.

Talldave

jem16 wrote: »

At least I don't need to think about that nowadays.

I'm the only one in the house now - just can't make my mind up whether to keep it beside me in the living room or stick it in the hall which is large and loses heat straight up the starirs.

Lounge is probably best - but I would suggest the trick is not to keep moving it, as that'll confuse the optimum start calculations.

In reality, you'll go through a phase of adjusting the best temperatures on the stat to suit your comfort level - after that, you'll be able to leave it alone.

Talldave

Pincher wrote: »

Jesus, it's a little sky.net from Terminator!
That is just far too intelligent for its own good.

I much prefer a programer that goes on and off when I decide.
If I leave a few windows open for ventilation on a cold day,
it's going to come on without me knowing because it wants to prepare the house for some learnt behaviour that I don't understand. And waste gas.

You can always override it in those circumstances. But to be honest, the automation works out better almost all of the time.

The concept of thinking "I will turn my heating on at time x and off at time y" - with the thermostat fixed at one temperature is just a bit old fashioned.

I laugh when I hear people having conversations along the lines of "wasn't it cold last night, we had to leave the heating on". I have no idea whether our heating comes on when we're asleep - it's being handled automatically to ensure that we don't freeze, whether it's December or July.