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Thread: Upgrade existing heating to Smart Control

  1. #1
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    Default Upgrade existing heating to Smart Control

    Hello

    I am new here first post so hello to everyone and thanks for the forum some great reading here

    In my house I currently have 3 heating zones which are controlled by 3 Siemens REV24RF Wireless Stats which are bound to 3 Relay boxes which drive Potterton Myson zone valves for each zone and then limits on Valve fulfill call for heat on Boiler


    Basically any Valve open boiler fires all Valves closed Boiler off Valves open and close on Stat Setpoint

    This has Worked very well for last number of years Stats are set at 21c in Living areas and 19 in Bedroom Zone and I never have to adjust Siemens Stats are really Good, PID and optimum start

    I wanted to upgrade to get control on smartphone app but when I investigated its really difficult to get a system that supports 3 wireless Zones

    I dont want to go the full Smart Radiator Valve on each Rad as what I have with the 3 Zones works great House is always comfortable and Gas Bills are modest so paying out big money makes no sense as my margin for saving is low

    I want to be able to control 3 zones remotely The Honeywell Gateway only supports 2 wireless Stats I Think I can Get Evohome controller and 3 wireless stats and relays and set them up as zone actuators will this allow me remote access to 3 zones with full control over each

    I was also looking at Zwave Controller and 3 stats but to be honest I am not sure if anyone knows of a way to achieve what I want with minimum disturbance as I say what I have works great

    Thanks A Lot

    Mylesm

  2. #2
    Automated Home Sr Member electronicsuk's Avatar
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    Three T87RF/BDR91 packs and the evohome controller should do it, but it's still an expensive proposition to only gain web based control. How many radiators do you have? If it isn't many, you might be better spending your money on HR92s.

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    Quote Originally Posted by electronicsuk View Post
    Three T87RF/BDR91 packs and the evohome controller should do it, but it's still an expensive proposition to only gain web based control. How many radiators do you have? If it isn't many, you might be better spending your money on HR92s.
    Thanks for that I have 10 Rads split into 3 Zones with zone valves

    I also thought of 3 stats and relays and evocontroller but I need someone to confirm if the controller can handle 3 Stats I know the Orignal Gateway could only handle 2 Wireless stats

    But am i right in saying evohome controller would act as 1 stat and I would need 2 more for the other zones cant seem to find info on this

    All I want to do is make existing 3 Zones smart but it seems very few systems allow more than 2 Zone valve controls I might have to go the road of a Z wave Controller

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    Quote Originally Posted by electronicsuk View Post
    Three T87RF/BDR91 packs and the evohome controller should do it, but it's still an expensive proposition to only gain web based control. How many radiators do you have? If it isn't many, you might be better spending your money on HR92s.
    Thanks Again

    Just a question how do people Find the Temp sensing on the HR92 valves I always found TRVs to be very inaccurate at measuring as their position is normally not the best either too close to floor or in draughts so the other way is to have a room stat bound to the rad valve but this would be extremely expensive for each room

    If I could switch 3 zone valves with remote access I would be sorted

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    Temp sensing on the HR92 is spot on in my experience.

  6. #6
    Automated Home Sr Member electronicsuk's Avatar
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    Pretty sure you can have a T87RF for every zone (so up to 12) with evo. As far as the controller is concerned, it doesn't care whether the temp sensor is a HR92 or a T87RF. The limit you mention with the gateway doesn't apply - the new evo system doesn't have a separate gateway, and even on the older system, as I understand it, the only device the gateway actually connects to is the evo controller.

  7. #7

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    Thanks all for the replies - Mylesm - as all the post say - you can have a sensor per rad if you wanted. You can even have each rad operate independently under a single zone (multi room setting in evohome).

    If you want remote control for 3 zones - evohome is a good choice. Or you could buy 3 x SZT, but you would need 3 gateways, so not economical.
    getconnected.honeywell.com | I work for Honeywell. Any posts I make are purely to help if I can. Any personal views expressed are my own

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    Quote Originally Posted by Rameses View Post
    Thanks all for the replies - Mylesm - as all the post say - you can have a sensor per rad if you wanted. You can even have each rad operate independently under a single zone (multi room setting in evohome).

    If you want remote control for 3 zones - evohome is a good choice. Or you could buy 3 x SZT, but you would need 3 gateways, so not economical.
    Thanks For reply this is where it gets confusing for me I see Honeywell sell a 2 Zone Solution which has 2 SZT and One Gateway So For 3 Zones is it possible to have 2 SZT on one Gateway and 1 SZT on another therby needing 2 Gateways

    I was really looking to make what I have smart ie control heating from app but its looking like it would not be worth it as what I have with the 3 siemens stats and 3 Zone Vlvs works very well all my ZOnes control to +/- 0.5 degrees

    I might look at remote control relays just to wire across the time clock for each zone

    If anyone has any other idea please let me know

    Thanks for replies
    myles

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    Just came across this looks like it might work to automate my 3 zones

    http://www.fibarouk.co.uk/boiler-con...o-dual-relays/

    mylesm

  10. #10
    Automated Home Sr Member electronicsuk's Avatar
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    Quote Originally Posted by mylesm View Post
    Just came across this looks like it might work to automate my 3 zones

    http://www.fibarouk.co.uk/boiler-con...o-dual-relays/
    Sounds like it would work, if all you want is on/off control. However, in your original post, you spoke about full control over each zone. That, to me, suggests that you should be able to remotely monitor the zone and change setpoints. For that, you need evohome or a similar system. Equally, I suppose you could buy three Nest thermostats and fit one per zone.

    Whatever you choose, doing the job properly is going to require some capital outlay. What are you actually hoping to achieve? If all you want to do is turn your heating off if you've accidentally left it on while away from the house, for example, then perhaps some basic home automation would better suit your application?

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