Author Topic: Danfoss RA-plus - controllable with linuxMCE 0710 ?  (Read 2227 times)

Viking

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Danfoss RA-plus - controllable with linuxMCE 0710 ?
« on: January 09, 2009, 03:35:41 pm »
Hi,

Is it with LinuxMCE 0710 possible to use the Danfoss RA-plus to control the heating in my house ?


Background info.
I am building a LinuxMCE system in my new house and at the moment I am looking into the things I need.
I live in Denmark (Europe) and plan on using Z-wave for doorcontacts and maybe also movement sensors.

Thanks in advance :)
Viking

Emiku

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #1 on: January 09, 2009, 07:50:01 pm »
Hi,

Make sure it is the Danfoss RA-plus__W__ model =)

hari

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #2 on: January 09, 2009, 08:18:34 pm »
be aware that it only supports setback for some degrees and no full controll (it is a setback schedule thermostat :-) )

br Hari
rock your home - http://www.agocontrol.com home automation

Domodude

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #3 on: January 09, 2009, 10:14:41 pm »
be aware that it only supports setback for some degrees and no full controll (it is a setback schedule thermostat :-) )

I don't believe there are any full-range thermostats on the (EU) market; do you know of any?

hari

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #4 on: January 09, 2009, 11:43:26 pm »
yes, some UK company makes regular 3 wire thermostats. But no, I don't know any other valve replacement type devices..

br, Hari
rock your home - http://www.agocontrol.com home automation

Viking

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #5 on: January 11, 2009, 12:49:39 am »
Hallo Hari,
be aware that it only supports setback for some degrees and no full controll (it is a setback schedule thermostat :-) )
Thanks for telling me :) I already read that before and am not 100% happy with that, but maybe there is a good reason for doing it that way. Is it maybe more economic on a daily basis ? But it would be nice if one could turn heat more down when one is on holidy ;)

And thanks for your good work on the z-wave part of LinuxMCE :)

Greetings
Viking

Viking

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #6 on: January 11, 2009, 12:52:07 am »
Hallo Emiku,

Make sure it is the Danfoss RA-plus__W__ model =)
Whats so special about the W model ? It is the right one for Denmark/Europe ? Or the only one that works ?

But I can program a schedule for the RA-plus W then ?

Thanks
Viking

Emiku

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #7 on: January 12, 2009, 08:37:21 am »
Hi Viking,

The W (Wireless (?)) model is z-wave enabled the other one is just programmable.

Btw. I read that the setback method was the only economical way to do it, it would be too expensive to lower the temperature beblow 2-3 degree C and then later heat it up again.

You could also look into remotely controlling your mixing Shunt, that would work but set the same temperature in the whole house.

-Emiku

Viking

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #8 on: January 13, 2009, 12:52:59 pm »
Hi Emiku

I see you live in denmark :) I am also danish.

>Btw. I read that the setback method was the only economical way to do it, it would be too expensive to lower the temperature beblow 2-3 degree C and then later heat it up again.
Where did you read that ?

So is it possible somehow to control "fjernvarme" ? (Sorry folks, but no idea what the English word is.)
I would not mind controling the temperature of the whole house to the same level.

Thanks :)
Greetings
Viking

hari

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #9 on: January 13, 2009, 02:51:19 pm »
Fernwaerme? Think it is called "community heating"

br, Hari
rock your home - http://www.agocontrol.com home automation

Viking

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #10 on: January 13, 2009, 10:21:35 pm »
Yes, "Community Heating" sounds right :)

Greetings
Viking

Phil_in_China

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #11 on: February 17, 2009, 09:26:12 pm »
Hallo Hari,
be aware that it only supports setback for some degrees and no full controll (it is a setback schedule thermostat :-) )
Thanks for telling me :) I already read that before and am not 100% happy with that, but maybe there is a good reason for doing it that way. Is it maybe more economic on a daily basis ? But it would be nice if one could turn heat more down when one is on holidy ;)

I think you all misunderstand a bit, the Danfoss wRA+ does have only two settings such as: (day & night) or (normal & setback) or (your temp & your temp-4C), the unit includes a built-in TRV (Thermostatic Radiator Valve) that you can set just like any other temperature controlled radiator valve. You can still set your living room to 20C and your bedroom to 19C and your office to 21C, all that happens is when this rooms are "setback" they will go to 16C, 15C & 17C. As for the turn the heat down when on holiday this would be via your main thermostat and not via the individual room control. The control it gives is all that's needed as setting a room temperature back more than 4C will take too long to get back to the "normal" temperature. The other advantage is that if your z-wave network goes down these will still control your room temperature.

Phil
 

hari

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #12 on: February 17, 2009, 09:52:52 pm »
The control it gives is all that's needed as setting a room temperature back more than 4C will take too long to get back to the "normal" temperature.
really, that depends on your needs. You cannot make those assumptions for all scenarios. That is the reason why there are other types than setback schedule on the market :-)

Quote
The other advantage is that if your z-wave network goes down these will still control your room temperature.
hu? The other Z-Wave thermostats usuall have local control..

br, Hari
rock your home - http://www.agocontrol.com home automation

Phil_in_China

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Re: Danfoss RA-plus - controllable with linuxMCE 0710 ?
« Reply #13 on: February 18, 2009, 06:12:40 pm »
The control it gives is all that's needed as setting a room temperature back more than 4C will take too long to get back to the "normal" temperature.
Quote
really, that depends on your needs. You cannot make those assumptions for all scenarios. That is the reason why there are other types than setback schedule on the market :-)
A 4C setback was chosen because it's sensible for almost all scenarios. We need to compare eggs with eggs, you seem to me to be comparing it to a conventional thermostat ,a Z-Wave one or otherwise that controls the heat source for the home. The wRA+ is NOT a temperature controller of the home, it controls a room or more correctly a radiator. In all applications the wRA+ would also be used with a thermostat Z-Wave or conventional, after all it can't switch the boiler on or off, that's not its job. 

Now if we compare eggs for eggs, for Z-Wave you can either fit a wRA+ to control rooms or as you suggest a Z-Wave non-setback thermostat and a control valve in each room.
However even now do you have control you think you have? 
What happens when the house thermostat wants 20C and your bedroom thermostat wants 24C?
The house stat detects 20C and switches off the boiler, but your bedroom stat is at 21C and wants heat, what happens then?
The only way to get this total room control that you want is to have each room thermostat control not only its own room valve, but also control the boiler as well.
For me I'd rather plonk a few wRA+ units around the house and use a setback schedule for each room.
Quote
The other advantage is that if your z-wave network goes down these will still control your room temperature.
Quote
hu? The other Z-Wave thermostats usuall have local control..
see above

Phil