correctly setting digi stat

dori2o

I have a Honeywell CM61NG Digi Stat, it has 6 presets on it.

At the moment I have the stat set as follows.

1) 7.00am 16.5 Degrees
2) 7.30am 22 Degrees
3) 11.30am 18 Degrees
4) 3.15pm 22 Degrees
5) 9.30pm 20 Degrees
6) 11.00pm 16.5 Degrees.

The reason I have the stat set like this is that I have found that if I have setting '1' as 7.30am 22 Degrees, the heating actually comes on at about 5am and the room is at 22 degrees at 7.30.

This is not what I want, I want the heating to come on at 7.30 and heat uop to 22 Degrees from then.I have found that this is wasting so much gas it is unbelieveable.

So I now have to force the system into staying cold then heating up at the last minute.

Does it sound like I have a probklem with the stat, or is this how they should work, i.e. be at the correct temperature as said time.

Any help would be appreciated

rockin_plumber

If you read the instructions.....
It probably mentions something called optimum start....
Basically this works out how long it will take to reach a desired temperature at that given time and it takes into consideration what the temperature is and how long it will take to raise it to your desired temperature.

I would have thought it would be better to have the first time at 7:30.. set at 22 deg c.. (or whatever time you want the room to be 22 deg c)
Then set your other times & temperatures through the day as required.

If you dont use any keep them at the end of the day set to the lowest setting (5 deg c) at a time you dont need them.

billyjojimbob

How To Turn OFF “OPTIMUM START” CM61


STEP 1 PUT THE THERMOSTAT IN THE OFF POSITION

STEP 2 PRESS 3 BUTTONS TOGETHER (at exactly the same time) WHICH ARE:- THE INFORMATION i BUTTON AND PROGRAM BUTTONS 3 & 4
This will show a code of:- ICL 1 - let go of buttons

STEP 3 PRESS PROGRAM BUTTON 2 This will now show a code of 3OT 1

STEP 4 PRESS THE + BUTTON (on the left-hand side of the digital display) TAP THROUGH UNTIL YOU REACH 15 OP 1

STEP 5 WITH THE TEMPERATURE DOWN BUTTON CHANGE THE 01 TO A FLASHING 0. CONFIRM THE FLASHING 0 WITH THE INFORMATION BUTTON i The 0 will now be static

STEP 6 PUT THE THERMOSTAT BACK IN TO THE AUTO POSITION. THE "OPTIMUM START" IS NOW SWITCHED OFF



How To Turn OFF “OPTIMUM START” CM67

STEP 1 PUT THE BOTTOM LEFT-HAND SLIDER IN THE OFF POSITION

STEP 2 PRESS 3 BUTTONS TOGETHER (at exactly the same time) WHICH ARE:-
THE INFORMATION i BUTTON AND PROGRAM BUTTONS 3 & 4
This will show a code of:- ICL 1 – let go of buttons

STEP 3 PRESS PROGRAM BUTTON 2 This will now show a code of 3OT 1

STEP 4 PRESS THE + BUTTON (on the left-hand side of the digital display) TAP THROUGH UNTIL YOU REACH 15 OP 1

STEP 5 WITH THE TEMPERATURE DOWN BUTTON CHANGE THE 01 TO A FLASHING 0. CONFIRM THE FLASHING 0 WITH THE INFORMATION BUTTON i The 0 will now be static

STEP 6 PUT THE THERMOSTAT BACK IN TO THE AUTO POSITION. THE “OPTIMUM START” IS NOW SWITCHED OFF


Traditional Controls operation
In the traditional controls for a heating system, switching times and temperature are set by the householder on a programmer and room thermostat. Once set, the system will come on up at exactly that time and controls at the same temperature each day, until the householder alters the timings or room thermostat temperature.
This adjustment normally only takes place in the middle of winter, when there is a sharp frost and the house is not warm enough for everyone getting up in the morning. To make sure that this lack of comfort does not happen again, the householder sets the heating to come on earlier or the room thermostat to a higher setting. From then on, the heating is forgotten about, as everybody is warm enough, but still the heating comes on at that earlier time to a higher temperature. This is because simple programmers and room thermostats can only switch as and when they are programmed and set to, switching at exactly the set time with no reference to how cold it is.

Programmable temperatures and Optimum start
Extra Savings
Now is the time to consider the extra savings that can be made by varying both the temperature and start times. The heating system has been designed to cope with the coldest expected winter conditions. On warmer days, the heating will come on at the same time and temperature as it would have done for the coldest day of the year. If you have a programmable thermostat that can provide both separate temperatures and times, yet delay the heating start time until the latest possible moment and still achieve the set point temperature when you need it, you can make a saving every day. That is the principle of programmable temperatures with optimum start.


Savings from variable setpoints How optimum start works

By using both variable Temperatures and Optimum start, on a cold morning, the heating is started at, say, 6.00 am, which ensures that the house is warm enough (say, 18oC) by the required time of 8.00 o’clock. As the weather gets warmer, the start time is delayed progressively, so that on even a moderate morning, the start up is significantly later (say, 7.30), whilst the heating still achieves the desired 18oC by 8.00 o’clock.