Danfoss RX1 wiring

[nitram76]

I've got a Danfoss TP700 and I'm connecting the RX1 receiver up to a Halstead Ace. The boiler has terminals L1 and L3 linked as it's running on the timeclock. The RX1 has L & N supply and terminal 2 as a common with 3 and 4 zone on and off. It says to connect pin 2 to mains live but I don't think this is correct.

Can anyone help me wire this up please? I think I need to connect 2 and 3 on the RX1 to L3 & L1 on the boiler. Is this right or am I going wrong? The instructions aren't very clear.

 

[D_Hailsham]

I've got a Danfoss TP700 and I'm connecting the RX1 receiver up to a Halstead Ace.

The RX1 needs a 240 supply to run the electronics; this can come from the boiler.

Remove the link between L1 and L3.
Run a 4-core cable or two 2-core cables (earth not required) from boiler to the RX1.
Connect L1 to L and N to N (use brown and blue or one 2-core).
Connect L2 to 2 and L3 to 3 (use other wires or second 2-core).


Hint

Make sure you check communication between the RX1 and the TP700 controller from the proposed controller location before fixing the RX1 to the wall.

 

[nitram76]

Thanks but I'm still confused, sorry if I'm being stupid but you say connect L1 where the link was to L? (240v mains) That doesn't seem right to me.

I get the 240v supply bit and that the L1-L3 link is where I'm wiring in the boiler but the RX1 control end is where I'm confused. See top of page 6 in the link below. It says to link terminal 2 to mains which I'm not sure I need to do. And which of terminal 2,3 and 4 do I need to connect to L1 and L3.

http://randall.danfoss.com/PCMPDF/37038v02s1-24.pdf

Again sorry if I'm being stupid I just don't want to cock this up. Any help is greatly apprecaited

 

[D_Hailsham]

Thanks but I'm still confused, sorry if I'm being stupid but you say connect L1 where the link was to L? (240v mains).

I meant L on the RX1! L1, N and Earth are the mains input to the boiler. Connecting Boiler L1 to RX1 terminal L and Boiler N to RX1 terminal N provides the RX1 with power.

I get the 240v supply bit and that the L1-L3 link is where I'm wiring in the boiler but the RX1 control end is where I'm confused. It says to link terminal 2 to mains which I'm not sure I need to do. And which of terminal 2,3 and 4 do I need to connect to L1 and L3.

This is where I might confuse you more.

The mfr instructions say that L2 and L3 should be linked not L1-L3. The difference is that L1 is permanently live, while L2 is only live when the boiler is ON at the timer.

The mfr instructions for fitting a thermostat assume you are using the internal clock, so you fit the stat between L2 and L3. But you are fitting a programmable thermostat, so the internal boiler clock is redundant.

You have two choices: bypass the internal clock completely, or set the internal clock to run continuously. I think bypassing the clock is better as it avoids any chance of someone causing problems by fiddling with the internal clock.

Here is how you do it:

This is where I change my original instructions

You only need a 3-core (plus earth) cable.

* Remove link in the boiler.
* Brown to Boiler L1
* Blue to Boiler N
* Third wire to boiler L2

At the other end:

* Brown to RX1 terminal L
* Blue to RX1 terminal N
* Third wire to RX1 terminal 3.
* Connect a link between RX1 terminals L and 2

Come back if you are still confused.

 

[nitram76]

Thanks for that but after a bit of head scratching I've got it working now.

Used L and N from boiler L2 & N. Removed link in boiler and wired L3 to terminal 3 on the RX1 and linked terminal 2 to L. Works a treat!

 

[D_Hailsham]

Used L and N from boiler L2 & N. Removed link in boiler and wired L3 to terminal 3 on the RX1 and linked terminal 2 to L. Works a treat!

Good to know you worked it out for yourself - much more satisfying

The only comment I would make is that taking the power from L2 only works if the boiler clock is set to continuous. Taking the power from L1 avoids this potential problem.

 

[diytrying]

hi, sorry to bump such an old post but it looks like it could help me. d_hailsham I have a RX1 with the wiring setup you suggest above (i.e the live is connected to the com). I'm planning to swap it out for a hive system - already discovered this setup doesn't work - the lights are fine but the boiler doesn't fire. Do you have any suggestions?

 

[diytrying]

Cracked it!