Programmable thermostat for Vaillant ecotec Pro 28

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Hi
I have just replaced my boiler from BAXI 105e to this one.

I do not like the Honeywell CM921 wireless programmable thermostat that is installed as it has only 3 program settings.
While on Baxi I had Grasslin Digital Timer Clock FM/1 DIGI 20 03.40.5015.1 and it had 20 settings I was using for different times of the day.

I just wondered if I would be able to use the old timer on this new boiler?

Thanks
 
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Not sure what you mean by 3 program settings. The CM921 can be programmed with 6 temperature changes through the day. Do you need more? If you want different programs every day or weekday/ weekend then you need a CM927.
 
why would anybody want 20 settings ? the honeywells are top of the line for their price :confused:
 
Hello

There 3 settings for ON and 3 for OFF also the same on CM927.

I do not want 20 settings but only 6 or 7.

Honeywell may be top of the range but it is not good to me if it can not do what I need.

I need to setup this following timer

1- ON 00:00 OFF 02:00
2- ON 05:00 OFF 08:00
3- ON 10:00 OFF 12:00
4- ON 16:00 OFF 18:00
5- ON 20:00 OFF 21:00
6- ON 22:00 OFF 23:00

Can any of the Honeywell timer do the above on this boiler? please let me know.

I do not want my boiler to run constantly and I really need to have control the whole opreation of the boiler. Which use be much easier with older KNOBS. I really hate these ECO nonsense that suppose to save us bills not run 24 hours.

So the question was can I Install the old digital timer on this new boiler?

Thanks
 
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Hello

There 3 settings for ON and 3 for OFF also the same on CM927.

No, there are six settings for different temperatures through the 24 hour period. They are not intended to switch the boiler on and off, just bring the house to the temperature required at different times of the day. That's the idea of programmable thermostat. So typically you might have 18C at 6am, 15C at 9am, 19C at 5pm, 14C at 11pm.
 
Hello

There 3 settings for ON and 3 for OFF also the same on CM927.

No, there are six settings for different temperatures through the 24 hour period. They are not intended to switch the boiler on and off, just bring the house to the temperature required at different times of the day. That's the idea of programmable thermostat. So typically you might have 18C at 6am, 15C at 9am, 19C at 5pm, 14C at 11pm.

Exactly my point the boiler is running 24 hours I do not want 14C at 11pm

To me it looks like 3 ON/OFF settings as below
say

1- 06:00 22C
2- 08:00 10C (To close the damn boiler)
3- 12:00 22C
4- 16:00 10C (again as above)
5- 18:00 22C
6- 23:00 10C (to close it again)


With the above settings the house is still never warm...

Now compare this with my required timetable in top post.

This is really a nuisance. I am really regrating the boiler change...

Can anybody please answer my original question please. if the Digi 20 timer can be used with this boiler.

Thanks
 
You can replace the CM921 with a simple timer as you had before that will just turn the boiler on and off. Is it the case that you don’t want room thermostat control?

However, you say that the boiler is running 24 hours and also that the house is still never warm? This would suggest that the system is not working correctly.
 
I think there is a misunderstanding of what the CM927 will do.

6 settings is not 3 on, 3 off, it is 6 time zones. 6 on, 6 off.
It will do exactly what you show in your second post.
The boiler is permanently switched on but not permanently running. The stat will call for heat when required. This will fire up the boiler.

Moreover, the 927 is an inteligent stat. It will learn the characteristics for your home and switch the heating on so that it is at the desired temperature when you want, not relying on guesswork re the 'on' time.
I.E: You want heat at 6am. The ambient temp is x°C, you want it at y°C at 6am. The stat setting is 6am.
Based on the ambient temp the stat will call for heat at 5:40 if it will take 20 minutes to get to the desired temp by 6am. If the ambient temp is z°C then the stat will call for heat at the appropriate time.

You can't blame a stat or programmer for the lack of heat.
It's like blaming the light switch because the room is not light enough.

Part of the problem re getting the house warm could be down to the 10°C setting.
The (presumed) inefficiency of your home to retain heat and the fact that it is allowed to drop to 10°C during the day and overnight will mean a longer warm-up time when the heating switches on.
I have mine set at 14°C overnight, but our place is fairly efficient at retaining heat and the boiler never kicks in.
 
really these controls are designed to profile the temperature...its not helpful to think as just on or off...although clearly a lower temperature than actual equates to off...

as a guide when you are not at home you should drop the temperature 5-6c


I would be looking at vaillant's own controls...they give lots of options...
 
Thanks guys for your inputs.

I have to clarify that I only want a Time controlled ON/OFF timer switch that simply On and off the boiler. I am not bothered about Temperature controlled programmer, Also I think it is only effective if you have thermostat in every room in a house and I only have one and my house is not very good at conserving heat at the moment {still working on that}

I just need to know if I remove the Honeywell relay box will I be able to use the same wires on Timer Switch?

Thanks
 
why would anybody want 20 settings ? the Honeywells are top of the line for their price :confused:
iPhones are top of the range.
I have bought one online and the next day I wanted to smash it on the floor. returned it the next day and got myself a Android Sony ARC S instead.
Now I have the exact same feeling about this Honeywell CM921.

;)
 
Thanks guys for your inputs.

I have to clarify that I only want a Time controlled ON/OFF timer switch that simply On and off the boiler. I am not bothered about Temperature controlled programmer, Also I think it is only effective if you have thermostat in every room in a house and I only have one and my house is not very good at conserving heat at the moment {still working on that}

I just need to know if I remove the Honeywell relay box will I be able to use the same wires on Timer Switch?

Thanks

you have no grasp of the basics at all do you ? any advice is a waste of time :confused:
 
Thanks guys for your inputs.

I have to clarify that I only want a Time controlled ON/OFF timer switch that simply On and off the boiler. I am not bothered about Temperature controlled programmer, Also I think it is only effective if you have thermostat in every room in a house and I only have one and my house is not very good at conserving heat at the moment {still working on that}

I just need to know if I remove the Honeywell relay box will I be able to use the same wires on Timer Switch?

Thanks

you have no grasp of the basics at all do you ? any advice is a waste of time :confused:
Sorry mate It was joke.
Just to clear, You only made a useless statement about how good are Honeywell controls. there was no advice and no positive input from you like the rest of the helpers...

If you are easily offended you should be considerate about others too or atleast smile back.
 
There's been ample useful information. Either you can't or won't take it in.

You have a Honeywell CN921 fitted.
It offers what you claim to want; 6 on and 6 off settings.
You show temperatures for each of your time zones, so you do need the thermostat which comes with the CM921.
IT WILL DO WHAT YOU WANT! HAVE YOU READ THE INSTRUCTIONS?

My only suggestion now would be to take a copulative dismount because I'm of the opinion that this is a wind up.
 
There's been ample useful information. Either you can't or won't take it in.

You have a Honeywell CN921 fitted.
It offers what you claim to want; 6 on and 6 off settings.
You show temperatures for each of your time zones, so you do need the thermostat which comes with the CM921.
IT WILL DO WHAT YOU WANT! HAVE YOU READ THE INSTRUCTIONS?

My only suggestion now would be to take a copulative dismount because I'm of the opinion that this is a wind up.

Yes I have read the instructions and there are TOTAL 6 settings so no it does not do what I want. If you mean because when setting 2 is ON it automatically OFF setting 1.. that is just a word play ;)

If it was 6 On and 6 Off then yes I could have use it as I want to.
See these photos below of the actual CM921 I have. It will show you that there are JUST 6 settings which you can set on different Temp on set time.



So if I want to use it a time Switch it only count as 3 ON/OFF Programs. Which obviously it is not made for to be used as Time Switch.


So my question was if I could use a time switch like I had before on another boiler in this new boiler ecotec Pro 28 instead of honewell CM921!
Which has been confirmed by a member above.




Qui audit discit quoque :p
 

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