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Author Topic: Temperature control using Ver2  (Read 6562 times)

Offline mclauli3

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Temperature control using Ver2
« on: March 20, 2011, 06:04:11 pm »
I would like to use Vera2 to control temperature in a number of rooms. As this is Ireland it is a heating application :).

I would fit a temperature sensor in a room and have vera open and close a heating valve based on the temperature. Is it possible to do this with a scene(s) and if so how?

Thanks, Liam

Offline mclauli3

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Re: Temperature control using Vera 2
« Reply #1 on: April 03, 2011, 09:39:41 am »
Do I need to learn luup or can this be done with a scene?

Has anyone tried to control temperature in this or a similar way. It would eliminate the need for a thermostat to do the controlling?

Thanks, Liam

Offline huogas

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Re: Temperature control using Ver2
« Reply #2 on: April 03, 2011, 12:10:00 pm »
Quite easy to set up a scene that will trigger an actuator for opening or closing a valve, but not sure it will make the job. If doable, maybe not recommendable...

Just think about the strategy to really control the temperature. At what temperature do you close the valve in order the stay on the target ? Today's thermostats have proportional control to keep the temperature on the setup point.

Also I doesn't even want to think at what would happen if Vera fails...

Doable, but a thermostat is definitely recommandable... ;)

By the way, it could be all done with scenes, without programming.
« Last Edit: April 03, 2011, 12:20:05 pm by huogas »
Vera2 UI4(1.1.1245/3.2), Kwikset x1, HM-DW001 x1, ZRP100 x1, HA-04WD x1, ZDP100 x6, HSM100 x2, VRI06-1LX x8, ZW5301 x1, HM-FS001 x2, ZRW103W x1, GE 45606 x2, HA05C x1, TED5000 x1

Offline mclauli3

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Re: Temperature control using Ver2
« Reply #3 on: April 03, 2011, 05:31:09 pm »

Thanks huogas.

Sounds about right.

Are there thermostats available that can accept a remote z-wave temperature setpoint?

Offline huogas

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Re: Temperature control using Ver2
« Reply #4 on: April 03, 2011, 06:50:35 pm »
Yes. All Z-Wave thermostats do that. Please check on your favorite online store.

There is not too many choices. They are all low voltage devices. It should make the job for your situation.

Ask about specifics.
Vera2 UI4(1.1.1245/3.2), Kwikset x1, HM-DW001 x1, ZRP100 x1, HA-04WD x1, ZDP100 x6, HSM100 x2, VRI06-1LX x8, ZW5301 x1, HM-FS001 x2, ZRW103W x1, GE 45606 x2, HA05C x1, TED5000 x1

Offline oTi@

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Re: Temperature control using Ver2
« Reply #5 on: April 03, 2011, 10:25:48 pm »
Are there thermostats available that can accept a remote z-wave temperature setpoint?
And there are Z-Wave radiator thermostats as well, I believe; if that's what you meant. Check Danfoss.
Dezwaved at the moment...

Offline FlyBoyBob

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Re: Temperature control using Ver2
« Reply #6 on: April 04, 2011, 08:37:48 am »
Liam,

I am doing exactly what you describe. Here is an overview and I can post details if you are interested:

I have a z-wave (Trane) thermostat as my master thermostat - with daily schedules programmed.

In 3 separate rooms I have either a temp/humidity sensor or a 3-in-1 with temperature, all z-wave

I have 24v normally-open Honeywell zone valves controlling the cast-iron radiators in each room I want to control, with a dry-contact z wave switch controlling the 24v to the valve.

In the Vera I read the current temperature from the main thermostat, then the temperature in the room I want to control, and if the room is higher I close the valve. Yes there is a tiny bit of Luup code involved but it is as simple as it gets.

I also control the radiator nearest the main thermostat to balance the system.

Note that if the Vera or any device were to fail I would simple get rooms that are warmer than I want.

This can also be done as a proper zone-controlled system by using zone valves that are normally closed and have "end contacts" to trigger your heating system.

More details on any of the above if you want...
Hope this helps,
bob
« Last Edit: April 04, 2011, 08:52:07 am by FlyBoyBob »

Offline markbannister

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Re: Temperature control using Ver2
« Reply #7 on: April 04, 2011, 09:44:53 am »
OT -- what temp/humidity sensors are you using?

Offline FlyBoyBob

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Re: Temperature control using Ver2
« Reply #8 on: April 04, 2011, 09:54:51 am »
HM-TS001 - Z-Wave Temperature / Humidity Sensor

http://smarthome-products.com/p-1435-hm-ts001-z-wave-temperature-humidity-sensor.aspx

These devices are often out-of-stock most places but Jay at Smarthome-products.com seems to be able to get them, and at discounted prices...

Hope this helps,
bob

Offline huogas

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Re: Temperature control using Ver2
« Reply #9 on: April 04, 2011, 12:33:59 pm »
@Bob

What do you achieve as control ? I mean what is the span around the set point ?

(as an example, if the set point is 20C, what are the lowest and the highest temperatures observed ?)
Vera2 UI4(1.1.1245/3.2), Kwikset x1, HM-DW001 x1, ZRP100 x1, HA-04WD x1, ZDP100 x6, HSM100 x2, VRI06-1LX x8, ZW5301 x1, HM-FS001 x2, ZRW103W x1, GE 45606 x2, HA05C x1, TED5000 x1

Offline FlyBoyBob

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Re: Temperature control using Ver2
« Reply #10 on: April 04, 2011, 12:54:13 pm »
What do you achieve as control ? I mean what is the span around the set point ?

(as an example, if the set point is 20C, what are the lowest and the highest temperatures observed ?)

That all of course depends on your heat delivery system, heat loss in the room, and air infiltration. I have an old Amish Farmhouse built and re-built over several hundred years, currently with a hot water system with cast-iron radiators and some in-floor radiant heating that I am adding.

My reason for controlling the temperatures in individual rooms is due to the variables above - on cold windy days sometimes it's not enough heat, on sunny calm days it's way too much without individual sensors and controls.

The point is, regardless of the variables, if it's too hot in a given room compared to the main thermostat setpoint I (or the Vera I should say) simply stop the hot water going to that radiator. If the temperature at the main thermostat is higher I turn off the radiator in it's room. And turn the radiators back on if it's colder.

I am going to use > +/- 1 degree in my LUUP code right now but am still experimenting. Scenes can vary that = for instance I will be setting my bedroom warmer than the setpoint for the rest of the house at night. I might even take outside temperature, sunlight, and humidity into account: the possibilities are endless for a tinkerer like me!  ;D

bob

Offline huogas

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Re: Temperature control using Ver2
« Reply #11 on: April 04, 2011, 01:29:14 pm »
Thanks Bob for the explanations.
Vera2 UI4(1.1.1245/3.2), Kwikset x1, HM-DW001 x1, ZRP100 x1, HA-04WD x1, ZDP100 x6, HSM100 x2, VRI06-1LX x8, ZW5301 x1, HM-FS001 x2, ZRW103W x1, GE 45606 x2, HA05C x1, TED5000 x1

Offline mclauli3

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Re: Temperature control using Ver2
« Reply #12 on: April 05, 2011, 03:42:06 pm »
Hi Bob,

Thanks for the information. It is very useful. The background to my installation is as follows:

I am building a new house in Ireland with a very high specification for insulation and air tightness (more or less Passiv standard). This will need very little heat and no cooling. The only heating I am putting in is underfloor heating operating at 40C (104F) water temperature (from a high efficiency low temperature air source heat pump) in 3 rooms (2 beds and a bethroom). The house will have a mechanical heat recovery ventilation system which will keep the whole house at the same temperature (I hope!)

The heat pump has a 3 port valve to turn on/off the underfloor heating. I have provision for, but am not yet fitting actuators to the three rooms, i.e. they will all act together and will initially be always open. I am looking to have a z wave solution to control the 3 port valve (on/off) with a smallish deadband.

I was considering putting Vera to control the temperature but based on feedback here I am now considering a z wave thermostat (like you suggest) to control the 3 port valve based on the temperature in a different room (I am hoping that all rooms are the same temperature and the heat finds its way via the HRV to all rooms) to the 3 rooms with underfloor heating. The thermostat would have timers/setpoints I assume. Is there an advantage to having Vera involved as well? Regards, Liam




Offline computerjohn

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Re: Temperature control using Ver2
« Reply #13 on: April 05, 2011, 03:53:36 pm »
Good find my friend!!

HM-TS001 - Z-Wave Temperature / Humidity Sensor

http://smarthome-products.com/p-1435-hm-ts001-z-wave-temperature-humidity-sensor.aspx

These devices are often out-of-stock most places but Jay at Smarthome-products.com seems to be able to get them, and at discounted prices...

Hope this helps,
bob
Vera2 UI4 (1.1.1245), IT-100, 2x Trane Thermostats, 6x Intermatic HA03 Lamp Modules, 1x Intermatic HA07 Remote, 4x GE 45613 3-way Dimmer Switches, 13x GE45606 Dimmers Switches, 2x GE 45605 Receptacles, 16x GE 45604 Outdoor Modules, 3x GE 45603 Appliance Modules, Automated Saltwater Reef System

Offline FlyBoyBob

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Re: Temperature control using Ver2
« Reply #14 on: April 05, 2011, 03:56:58 pm »
Good find my friend!!

http://smarthome-products.com/p-1435-hm-ts001-z-wave-temperature-humidity-sensor.aspx

Get to know Jay at smarthome-products.com - not only does he sell all the good stuff but he has two houses kitted out to the max with zwave toys, and he knows what he's talking about!

In my experience - if you want something you can't find he'll find it for you, or tell you it can't be done.
« Last Edit: April 05, 2011, 04:08:30 pm by FlyBoyBob »