Danfoss RMT230 Thermostat

Discussion in 'Electricians' Talk' started by Dave1978W, Nov 8, 2018.

  1. Dave1978W

    Dave1978W New Member

    Hi, I ordered a replacement RMT230, but when going to replace the old one, my old thermostat has 3 wires whilst the replacement does not have the terminal for the Neutral wire (Blue) which goes to the accelerator.

    My question is, can I simply not use the neutral? If so, what effect overall will it have on the heating system without having the accelerator? Will this have a negative impact on the performance?

    I have the earth already not in use, but I've read other threads where when 'upgrading' to a digital thermostat and only 2 wires are required, it has been stated that the blue should be taped off and left unused. I was wondering if it is the same in this circumstance?

    The first image is the same as mine wired. The second is what I have received and looking to replace the old one with.

    Thanks in advance.
     

    Attached Files:

  2. Mike83

    Mike83 Active Member

    What model is the new stat. It doesn’t appear to be rmt230
     
  3. Dave1978W

    Dave1978W New Member

    Yes, its the RMT-230, but two wire rather than the 3 wire version with accelerator.
     
  4. Mike83

    Mike83 Active Member

    Ok. Live into 1. Switched live 2
     
    Dave1978W likes this.
  5. Dave1978W

    Dave1978W New Member

    Thanks Mike

    Does not having an accelerator in the thermostat have a huge affect on its performance?
     
  6. Mike83

    Mike83 Active Member

    I’m not sure.
     
  7. Allsorts

    Allsorts Well-Known Member

    Nor me.

    Will it have some negative effect on performance? Almost certainly.

    I think it was just the wrong one to buy, I'm afraid.
     
  8. Mike83

    Mike83 Active Member

    I didn’t even know there was a 2 wire RMT230 on the market
     
  9. Bazza

    Bazza Well-Known Member

  10. Bazza

    Bazza Well-Known Member

    It will work ok, but not as accurately as one with an accelerator.
    You’ll need to put the blue wire in a bit of insulated terminal block.
     
  11. Mike83

    Mike83 Active Member

    If it can be done with 2 wires then why not just supply the normal stat with neutral but give the option not use it.
     

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