So our new up-to-date CH fitted in the summer took us back in time with a rotary thermostat (rather annoyingly the installers took away (and "lost") my Horstmann DRT so I couldn't reinstall it).
I got a good deal on a Honeywell CM907 and installed it this week. But I'm a little confused about "optimum start". The manual says:
I have a constant background temperature of 16c and raise this to 19c during the early morning, mid afternoon and evening periods that we are home.
With the Hortsmann I set the 19c temp to start at 6am ready for us getting up at 6:30.
Does optimum start on the CM907 mean that I can set the 19c temp for 6:30 and the temp will be reached by 6:30 because the stat will call for heat at the right "start" time?
eg, if its 16c in the house then it might start it at 6am,
if its 17c in the house it might start it at 6:10,
and if its 18c in the house it might start at 6:20.
OR
Does optimum start need the external temperature sensor and so I cant use it anyway.
I got a good deal on a Honeywell CM907 and installed it this week. But I'm a little confused about "optimum start". The manual says:
What is Optimum Start?
Optimum Start is a program which ensures that the optimum temperature conditions are achieved at the required times. This is an Energy Efficiency feature that adjusts the start time of your heating system depending upon how cold it is. For example, on cold days your heating system will be started earlier to ensure that your home is warm when you get up (at the target temperature) and on warmer days the heating system will be started later to save energy. So, if the Optimum Start Feature is used, then the time / temperature settings which are entered into the thermostat should be set to when you want to be warm by and not when you want the heating system to start.
I have a constant background temperature of 16c and raise this to 19c during the early morning, mid afternoon and evening periods that we are home.
With the Hortsmann I set the 19c temp to start at 6am ready for us getting up at 6:30.
Does optimum start on the CM907 mean that I can set the 19c temp for 6:30 and the temp will be reached by 6:30 because the stat will call for heat at the right "start" time?
eg, if its 16c in the house then it might start it at 6am,
if its 17c in the house it might start it at 6:10,
and if its 18c in the house it might start at 6:20.
OR
Does optimum start need the external temperature sensor and so I cant use it anyway.