Now all i have to do is begin computation of that saving in energy achieved…what about you guys in Europe? What report do you get?
there is supposedly a 3.0.6 software update available for Nest thermostat users (heating only mode)…. somehow I am not able to get this yet on my nest.
Can anyone having “heating only” mode setup, share their experience in getting 3.0.6 please?
Since Nest thermostat is not officially supported in EU, I am not expecting much support from the US, just curious…
some of you may say that winter is behind us (which I really hope)… somehow, my heating system did turn on this morning..
as you’re familiar with my blog, you know I am the proud and happy user of a Nest thermostat.
I have had a 2nd yet brand new in its box Nest thermostat (1st generation) seating doing nothing.
I have also a few other RC840T-240, so I have decide to put a “complete pack” for sale on ebay.
the auction starts tomorrow morning April 1st 2013 and there is another 24h before it finishes!
I don’t actually really know how many of you do walk by this blog, nor how frequently you’re checking on new posts.
although the graph below has French content, I wanted to share with you my 2012 gas consumption (quantified in terms of kwH) and the 2013 one “as of today”.
Note this is prior to the installation of the Nest Thermostat. Please note the following facts regarding our apartment:
- building from 1930s, with 3 sides “exposed”
- apartment located on the 2nd and last floor (15cm/2 inches of insulation made of cellulose wading)
- however the attic itself is not insulated
- cast iron radiators equipped with thermostatic heads
- the apartment is about 62m2 (~667 sq ft) and our ceiling is at 2.8m (9 ft 2 inches)
what about yours?
I have gone back in time and I can add the last few years on different chart (note that 2013 is partial at this point of course – note that my year counts from October to Octobers):
- it is too early to say how much Nest is bringing in terms of saving,
- to be noted that this winter appears to be particularly “cold” and lasting a long time.
- I will quantify this and number of days below 18degC (64F) within the period.
- I will also explain the reason why this decline overtime – I have installed insulation (summer 2009) , thermo-mechanical valves (summer 2010?)…
- Last but not least, I have moved a cast iron radiator location in my living room (summer 2012),
- and insulated my daughter’s bedroom from the inside (summer 2012)
Nest thermostat with Baxi caldaia murale – natural gas heater with Perri Termostati a 220 240v thermostat12 Feb
edited on Feb 12th 2013 – futuristic views included
following a request from Massimo a Nest thermostat potential adopter in Italy,
I am trying to assist him in what could be the ad-hoc wiring of a Baxi gast heater mated to a Perri Termostati, a 220 240 thermostat.
the two thermostat wiring options are shown below:
in my opinion, the “red” boxed wiring (if compatible with the Baxi heating unit) is preferred.
Massimo having now confirmed his wiring is not the red box above, but rather the separate circuitry of supply and dry switch as shown below:
…I am starting to think about how is the actual wiring done at the heating unit level – my point being that I do not believe the actual wiring per Massimo’s feedback
is as shown below (from the Baci user manual):
section added on Feb 12th 2013.
so given the status reach previously, here is below what I would advise one may want to setup in order to make the Nest Thermostat work with a heating system not providing both line and neutral.
Please note that my preliminary conclusions are that the RC840T is not per-say compatible as-is.
Now if we want to get a notch more futuristic and ask Nest Lab a serious ease of implementation with “most” heating systems in EU (at least the ones working on 220 240 volts), here is what a good step forward would be….
I just want to point that this version of Nest thermostat does not appear to exist today, but it should not be that complicated to roll out for the European market.
what do you think? Do you concur?
Good evening to all,
I said in my previous post, since we have been talking a lot about wiring and electrical aspects…
at some point comes the “routing” of all those connections. Below you can see if my apartment and
the three key area of interest: the heating system location, the breakers box and last but not least my nest thermostat location.
A couple of comments:
- all rooms are fitted with cast iron radiator
- each cast iron radiator is fitted with a thermostatic head to the exception of the so-called “Bedroom 2″ where the thermostat is located (for obvious reason)
the idea is to regulate the coldest room to whatever temperature I need and let all the other room (warmer in general) get settled via their individual thermostatic heads.
All I can say even before the Nest this setup worked pretty well – but the smartness of Nest is likely still to bring energy savings (hence dollars, Euros or whatever your currency is – I am flexible). the only issue I know with this setup, I will likely have is the auto-away feature not working well given the location of the thermostat (comments are welcome as usual).
- to wire my nest thermostat to the breaker box where the Aube RC840 unit will be located (this requires 3 wires, W/R/C)
- wire the aube RC840 to the Gas heater (this requires also 3 wires Ns/Ls/Lr).
- I may place my Aube RC840 right next to the gas heater (in case I struggle to add an extra wire – see my previous post)
- route W/R/C wires to the “breaker box” and then dispatch them to the nest location by means of proper “jumpers”
I have full flexibility when it comes to the number of wires to be run from the green box (the breaker’s box)
to the Nest Thermostat, however, I am missing 1-wire from the green box (the breaker’s box) to the gas heating system (blue).
As a side comment, a Neutral/Line/Earth are also needed to supply the Gas heating system (hence the 6 wires needed)
talk to you guys soon, any feedback? questions? critics? candid feedback is always welcome!
have verified in full my previously recommended wiring earlier this week – having a 3-wire (220 240 Volts) cable running from my gas heater, to my RC840, and 3-wire from my RC840 to my nest thermostat.
While doing this, I have actually used this to let me Nest get fully charged, updated to the latest software, and exercised it a bit.
A few comments for those who go thru this process:
- it took a few hours to get my nest battery charged up to at least 3.7V
- note that in between it may (at least mine did) reboot a few times – realizing it does not have enough energy to run wifi (required to get the update done – have no idea about the size of the download by the way, do you?)
- 3.7V is critical as it is the minimum Nest needs to be able to launch software updates
- once update was done, an easy trouble-free process, I was able to fully control my nest via my Ipad
I live in an 1930s building, and our apartment got renovated to the current Electricity standard a few years ago (meaning I have a decent amount of extra wires running thru the various electricity access). Frustration rose when I realize I did NOT have a 220 240 Volts with 6-wires but 5-wires!
This means I can’t properly wire the Ns/Ls/Lr from my heating unit to the RC840T (I had planned to locate it near my fuse box – opposite from my heating unit).
So I have paused my installation – and – it looks like the only alternative is to change the heater supply cable and upgrade it to a 6-wires one.That’s assuming of course, I have room to retrofit it!! If you can think of anything else to do… please chime in now!!
In any case, I have updated and confirmed now that the diagram below is fully working.
if you can’t figure out how is laid out the apartment and how the wiring has to run, I will draw up a schematic of the flat and the way the wire will be running thru.
I am going to briefly explain where did I purchase my five Aube’s Relay/Transformer RC840T .
in a previous post, I had mentioned the following:
#1 this product is not available in France and possibly not in Europe as it is not EC “stamped”
#2 Aube (North America) did categorically refuse to sell me a few units – probably for liabilities/warranties reasons.
I just want to make it clear I am not affiliated to Smarthome, but it turned out this is where I have placed my order for five units.
honestly, this turned out to be a smooth process (I even talked to their hotline at first), however it is worth pointing out that shipping costs were high – that’s also the reason why
I did order five units instead of one as originally planned.
The RC840T acquired is located here. I am under the impression those items are currently on sale as I post this message (!)
and I have recently posted feedback and rating which one should be able to read once they approve it.
for those of you interested, I am happy to share details of both shipping and taxes. I will post later…
to all, above is a drawing of my previous configuration using a “2-wire” thermostat, high voltage that is 220 240 Volts, directly connected to my gas heater.
couple of key points:
#1 the thermostat had batteries internally used to trigger the “dry switch” (now on the drawing).
#2 upon “heat” command (ambiant temperature below target) the “dry switch” basically closes the electrical path between Ls and Lr
#3 once Ls and Lr are connected together, this triggers the heater (gas + circulator)
#4 Ns connector is shown although not used in this configuration since thermostat operates from its own supply (internal batteries)