Need a new type of wall stat

[doitmyself]

The Honeywell CM9XX programmable stats have two adjustable System Parameters which might help.

Parameter 1:Ot sets the minimum ON time, which can be from 1 to 5 Minutes.
Parameter 2:Cr sets the cycle rate - 3, 6 or 12 cycles per hour

Setting 1:Ot to 5 and 2:Cr to 3 should help reduce the problem.

 

[petercj]

Another way around the problem could be to fit a wireless stat and leave it in a room that has a more stable temperature.

Either way, I think you will need to break out the thermals and extra socks to insulate against the temperature drop, which is likely to be quite noticeable.

The real problem is the lack of insulation in the room and not the stat, and in the longer-term it might be a better investment to look at ways of insulating the room than to spend out on a more complicated temperature control system that is a "sticking plaster" approach to the problem.

If you are handy, you may well be able to dry-line some of the colder walls at a lesser cost than fitting a fancy temperature control system that might not be as reliable as a simple old fashioned room-stat. Internal glazing is within the scope of the average DIY'er, and heavyweight lined curtains can make quite a different during winter evenings. A door closer costs around 10 pounds and is one of the best energy saving investments around.

Regardless of how often your boiler cuts in and out, you are still losing money by letting the heat escape.

 

[DirksPlumbing]

Hi Dirksplumbing, I have read the PDF manual for these and I can easily see the setting of the upper setting at 70F off, but still cannot find adjustment for the lower setting at 65F on.

Can you explain how it does that from the manual, so I can set the above to get the boiler cycles per hour down (ie, the boiler runs longer and stays off longer). Thanks.

It is the proportional bandwidth parameter. But bear in mind that more than 3 degC would potentially cause draft effects often described as cold radiation.
The Honeywells would not allow to overdo this anyway but if you are fiddeling you might even worsen the problem.