Siemens RDH10RF SET GB Room Thermostat

[daly]

Hi hope some kind soul could help me wire in my new Siemens RDH10RF SET GB Room Thermostat to a VAILLANT ECOTEC EXCLUSIVE 838 HE COMBI boiler I was hoping to install the receiver in place of my old apt thermostat not sure if there are enough wires here though.

 

[Gas2Air]

Bypass it. Connect permanent live from boiler and switch from reciever back in.

 

[daly]

Bypass it. Connect permanent live from boiler and switch from reciever back in.

Bypass what, a bit vague for me m8.

 

[Gas2Air]

Connect receiver into boiler live and neutral. Switch live back to the board for CH.

Leave the old stat where it is.

 

[daly]

Connect receiver into boiler live and neutral. Switch live back to the board for CH.

Leave the old stat where it is.

Sorry but all you've done is confuse me, I don't want to leave the old thermostat in why would I, I want to install the receiver in place of the old thermostat because the boiler is in a utility room and I am sure there would be communication probs due to the distance and proximity of the boiler.

 

[Gas2Air]

Connect receiver into boiler live and neutral. Switch live back to the board for CH.

Leave the old stat where it is.

Sorry but all you've done is confuse me, I don't want to leave the old thermostat in why would I, I want to install the receiver in place of the old thermostat because the boiler is in a utility room and I am sure there would be communication probe due to the distance and proximity of the boiler.

Right lets start from the beginning. What setup do you have right now? Is there a timer that feeds that room stat?

 

[daly]

Ok the boiler is located in a utility room outside of the main house, there is no timer fitted just a simple apt room thermostat in the dining room. wiring as shown in picture.

At the boiler the wires are connected to:
5 = Blue
4 = Yellow
3 = Red
2 = Earth

 

[daly]

Am I right that no earth connection is needed for the Siemens RDH10RF SET GB Room Thermostat, if this is correct do I move the wires 5=Blue neutral and 3=Red Live to the L and N on the boiler and connect these to the Live and Neutral on the RDH10RF receiver, leave the 4=yellow on the boiler connect it to LX or L1 on the RDH10RF receiver which would leave me with a spare earth wire which I could use on L1 or LX.

 

[daly]

Anyone

TIA

 

[daly]

150 views and no one can help.

What happened to Gas2Air?

 

[jackthom]

Red and Blue are Live and Neutral, use to power the receiver.

The Yellow is the switched live and should go to L1

You then need a short wire link to connect the Red live across into the LX terminal.

The Earth wire is unused and should be made safe so it can't come into contact with any of the other wires.

(When the thermostat is calling for heat, LX is switched through to make L1 live which fires up the boiler and pump via the Yellow)

 

[ianmcd]

you need 4 wires for your new receiver and it looks like you have them but you will have to alter where the wires are connected at the other end as the current configuration wont work, also is your earth at present an actual core ? it may be an earth wire which you cant use for a control wire

 

[daly]

You then need a short wire link to connect the Red live across into the LX terminal.

Is this at the receiver or the boiler.

TIA.

 

[daly]

you need 4 wires for your new receiver and it looks like you have them but you will have to alter where the wires are connected at the other end as the current configuration wont work, also is your earth at present an actual core ? it may be an earth wire which you cant use for a control wire

When you say actual core, the earth wire is the 4th wire not separately insulated in the cable where the red, blue and yellow are separately insulated is this what you mean.
TIA.

 

[D_Hailsham]

Red and Blue are Live and Neutral, use to power the receiver.

The Yellow is the switched live and should go to L1

You then need a short wire link to connect the Red live across into the LX terminal.

The Earth wire is unused and should be made safe so it can't come into contact with any of the other wires.

(When the thermostat is calling for heat, LX is switched through to make L1 live which fires up the boiler and pump via the Yellow)

This is correct, but just to make it clear:

Old - Colour - New
1 ----- Red --- L
2 ---- Yellow - L1
3 ---- Gn/Yel - Not used; make safe, e.g a terminal block.
4 ---- Blue --- N

Also, link L to Lx.