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Logamatic 2107 radiant floor heating and Fm 241 module .

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odium
odium Member Posts: 3
edited December 2021 in Thermostats and Controls
Good evening ! I have a logamatic 2107 installed on my radiant floor heating system . I am using it for the last few years . The last few days i decided to start digging a little bit of my own to it's service menu because i am not completely satisfied about fuel consumption per year . I have noticed that while the manual says that a floor heating system would require an FM 241 module to control the heat , my unit doesn't have one and i can only see CIRQUIT 1 in the service menu . Furthermore i cannot see the PERIM HTG or FLOOR HTG values and my ref temp is at 167 F. My questions are :
1) Can the logamatic 2107 work with floor heating without the fm 241 module ?
2) Does the increased ref temp cause any problem to the floor heating system ?
3) Does the boiler burn more fuel since my ref temp is set to 167 F and not to 113 F which is the recommended value for floor heating ?
4) Should i change the ref temp to 113 F myself even though i don't have the FM 241 module and i cannot see CIRQUIT 2 ?
Sorry for my lack of further knowledge !

Comments

  • Ironman
    Ironman Member Posts: 7,379
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    How many heating circuits do you have besides the floor?
    Is there a separate mixing device for the floor beyond the boiler?
    Some pics would help.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • odium
    odium Member Posts: 3
    edited December 2021
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    If i understand correctly beside the floor there is only one more cirquit that for the hot water . As for the separate mixing device i am not sure . First thing in the morning i will upload a photo of my boiler room if that can help more. 
  • GW
    GW Member Posts: 4,701
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    And while you’re at it take a picture of the thermostat. I suspect you’re running an on-off system. There are ways to make your system more efficient
    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    gary@wilsonph.com
  • odium
    odium Member Posts: 3
    edited December 2021
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    Good morning everyone and ty for your help. I will attach my pictures . I suspect that the technician who initially installed my system skipped for whatever reason on the FM 241 and went with mixing valves ( 4 of them ) that have a fixed temp of around 40 C for the floor .


    My initial questions stand and especially number 4!
  • GW
    GW Member Posts: 4,701
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    its hard to adsorb the details, need to ask a million questions, how many stats total?? How many different systems (how many temps)?? The mixing valves are 'fixed'?? They don't have a motor to change the temps?
    I'm stumped on the 'upper' set of pipes, the bypass is after the circ.

    Pop that cover on the wall unit, pic needed of the innards (there are dials/selection settings in there)

    pop the cover on the 2107, take a pic of the low v wiring on the left of the unit, need to see where that BFU is connected to

    When you move the big blue dial on the 2107, do you see 'room temp' anywhere? If yes, no need to pull the 2107 cover.
    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    gary@wilsonph.com