Results 1 to 10 of 10

Thread: Which FHT thermostat kit to buy?

  1. #1
    Automated Home Lurker
    Join Date
    Dec 2010
    Posts
    2

    Default Which FHT thermostat kit to buy?

    Hi

    I'm very interested in following others on here by buying some of the FHT kits, and Conrad seems to be the place to get them from.

    I'm a little unsure about exactly which to buy, however. I've seen some discussion of the FHT80B vs the FHT80B-II.

    Conrad are selling a kit (currently £40) called 'FHT 8 thermostat set', part number 570055 - 89. Is this the one to get? I'm interested in getting the system set up with computer control via FHEM eventually so I'm keen to get the right stuff.

    I'd be very grateful if anyone could point me in the right direction.

    Thanks

    James

  2. #2
    Automated Home Jr Member
    Join Date
    Dec 2009
    Location
    UK
    Posts
    24

    Wink

    Quote Originally Posted by gw0udm View Post
    I'm a little unsure about exactly which to buy, however. I've seen some discussion of the FHT80B vs the FHT80B-II.

    Conrad are selling a kit (currently £40) called 'FHT 8 thermostat set', part number 570055 - 89. Is this the one to get? I'm interested in getting the system set up with computer control via FHEM eventually so I'm keen to get the right stuff.
    I also find this all a bit confusing as to what works with what. This is what I ordered from Conrad for my system:

    - 620371 - "FHZ 1300 Radio Home Centre PC"
    - 750407 - "Radio heating thermostat FHT 80B-II" (Thermostat and actuator)
    - 570056 - "Actuator for 570055&617499&750404" (An extra actuator)
    - 560098 - "Heat relais FHT 8W" (Boiler connect)

    I have just looked on the Conrad site for the 750407 and notice that is sold out and they are suggesting an alternative which includes the window open sensor - 646463. This set includes the thermostat - 750404 - which I think is the one you need.

    Having looked at the instruction manuals for the 750404 and 570055, I think the 570055 doesn't allow for central control as it doesn't have a way to enter the 'CEnT - DEfault setting for the radio connection to the central system'.

    The 570055 instruction manual (page 65) compared with the 750404 instruction manual illustrates the difference.

    I hope this helps a bit but just to note I am not an expert in this even though I now have it working with FHEM

  3. #3
    Automated Home Jr Member
    Join Date
    Jun 2009
    Posts
    29

    Default

    The FHT 8 is one way only - it will report its status, but is not capable of being controlled.

    The FHT 80 on the other hand allows two way communication hence it being a little more expensive and absolutely the right choice if you want to do funky stuff with FHEM etc.

  4. #4
    Automated Home Lurker
    Join Date
    Jan 2011
    Posts
    2

    Default

    Will the cheaper FHT 8 still work with the boiler interlock?

    Many thanks,

    Angus

    (PS, hello everyone, been reading these threads for a while, trying to get my head around remote thermostats to reduce my ridiculous gas consumption!)

  5. #5
    Automated Home Lurker
    Join Date
    Feb 2011
    Posts
    5

    Default

    I have the same question as lazarette.

  6. #6
    Automated Home Jr Member
    Join Date
    Mar 2010
    Posts
    21

    Default

    The advantage of the 80B is that it is 2 way; the 8 being just one way (sending). I believe the boiler interlock just receives the info that the controller sends to the valve so would work with the cheaper 8.

    This is just my understanding, I only have the 80b and don't have the boiler interlock so I can't speak from experience and could be wrong.

  7. #7
    Automated Home Lurker
    Join Date
    Feb 2011
    Posts
    5

    Default

    I will send an email to Conrad.
    If FHT 8 works with FHT 8W it will save me a lot of money, expecially when buying packs like http://www.germanelectronics.ro/conr...040&pid=570855

  8. #8
    Automated Home Lurker
    Join Date
    Feb 2011
    Posts
    5

    Default

    The answer from Conrad:

    Die Unterschied zwischen FHT 8 und FHT 80B liegt darin, dass
    das FHT 80B eine bidirektionale Funkverbindung nutzt und somit
    mit der Zentrale FHZ 1000 kommunizieren kann.
    Das Wärmebedarfsrelais registriert die Funkinformationen beider Systeme.

    meaning:
    The difference between FHT 8 and FHT 80B is that
    the FHT 80B uses a two-way radio link and thus
    can communicate with the central FHZ 1000
    The heat demand relay records the radio information of both systems.

  9. #9
    Automated Home Lurker
    Join Date
    Jan 2011
    Posts
    2

    Default

    Thanks RoMania. Looks like the FHT 8 deals have stopped now, so I may be stuck with the FHT80 anyway!

  10. #10
    Automated Home Lurker
    Join Date
    Feb 2011
    Posts
    5

    Default

    You are welcome!
    I bought myself a FHT 80BTF for testing.
    It works good.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •