Recent content by jpadeutsch

I am thinking of fitting a CM907 to replace a Honeywell T6620B Thermostat. I would like to be able to communicate with it by phone. Is this possible, and what interfaces are available in UK? I don't think I can go to CM927 with wireless connection. My boiler is in an outside shed, and I...

Thanks for another useful reply John

But doesn't all this mean that the system takes longer (possibly much longer) to reach the desired temperature? If one uses the optimisation mode then the boiler will be fired earlier and may well therefore waste energy. Also it worries me that the decision about firing and cutting the boiler...

Thanks for replies. I was puzzled because I asked in a local plumbers' suppliers for a price for a CM901 The assistant looked up on their computer system, and said that the CM901 had been superceded by the CMT901. John

How does this differ from a non-programmable thermostat, switching boiler off when the desired teperature is reached, and on again when temperature has dropped by some predefined amount? John

Does anyone know what differences there are between the CM and CMT versions of the 900 series. It seems that current units are CMT, but the info on Honeywell websites seems to refer only to the CM series.

Thanks so much DH. That is a wonderful, clear explanation. So I guess that overall the pump will not be active for any more time than it would be on a unit without this feature. What happens if the calculated time for it to be on in the next 10 minutes is less than the minimum on time?

What does "cycles per hour" mean? Does it mean that the boiler turns on/off at this rate all the time? Can I disable this feature?