Wiring a salus t105rf to older Worcester ??

[macka09]

Hi guys. Any advice on fitting the above stat to an older Worcester green star HE? The boiler is existing so already has it’s live neutral earth but the old room stat has been disconnected due to the house being required. Any help would be great thanks.

 

[Burger]

Which greenstar? You ok with electrics and safe isolation? I’m not 100% with why the Salus states 5a fuse rating?
Usually 5 core cable, taking a live and neutral from the boiler or spur to feed receiver, remove the earth cable as not required, the other 2 cables will be live supply (ls) and live return (lr). Neutral will not be required for a wireless stat.

 

[macka09]

Which greenstar? You ok with electrics and safe isolation? I’m not 100% with why the Salus states 5a fuse rating?
Usually 5 core cable, taking a live and neutral from the boiler or spur to feed receiver, remove the earth cable as not required, the other 2 cables will be live supply (ls) and live return (lr). Neutral will not be required for a wireless stat.

It’s the older R25 green star HE COMBI. I’m fine doing it but the instructions with the Salus are terrible. Also I didn’t see anything about a 5a fuse?

 

[ShaunCorbs]

Com eg live from boiler

No eg call

 

[Burger]

Wiring same as what I’ve quoted, however I’ve been onto Salus website for the following:

 

[ShaunCorbs]

Wiring same as what I’ve quoted, however I’ve been onto Salus website for the following:

View attachment 39011

Max rating running rating is 3 amp

 

[Burger]

Max rating running rating is 3 amp

So why does it quote the 5a for wireless?

 

[EvilDrPorkChop]

Is it the Greenstar HE with the computer/digital timer on the front or just the normal model?

If it's the latter as others have said there should just be a LS and LR, then neutral. LS, common, LR NO receiver.

The 5A is the switching load of the relay, not the load required for the receiver.

 

[ShaunCorbs]

So why does it quote the 5a for wireless?

Different relay prob bigger cap to save any spikes

 

[macka09]

Is it the Greenstar HE with the computer/digital timer on the front or just the normal model?

If it's the latter as others have said there should just be a LS and LR, then neutral. LS, common, LR NO receiver.

The 5A is the switching load of the relay, not the load required for the receiver.

It is just the normal model.
So I just need to run a seperate 3 core to the receiver. LS, LR and neutral?

 

[macka09]

Which greenstar? You ok with electrics and safe isolation? I’m not 100% with why the Salus states 5a fuse rating?
Usually 5 core cable, taking a live and neutral from the boiler or spur to feed receiver, remove the earth cable as not required, the other 2 cables will be live supply (ls) and live return (lr). Neutral will not be required for a wireless stat.

It’s the receiver that I’m wiring up?

 

[Burger]

It’s the receiver that I’m wiring up?

So you need power to the receiver (live and neutral), a permanent live and live return (switch) not sure you need a neutral for the receiver.

 

[macka09]

Is it the Greenstar HE with the computer/digital timer on the front or just the normal model?

If it's the latter as others have said there should just be a LS and LR, then neutral. LS, common, LR NO receiver.

The 5A is the switching load of the relay, not the load required for the receiver.

It says in the salus instructions it needs a 4 core going to the receiver? SL off. Live. SL on and a neutral

 

[Burger]

Unless I have the wrong information, then it shows a live, neutral, common and normally open, which on your boiler setup is: live and neutral from your boiler terminals inside on the pcb. Your other 2 wires go to Ls and Lr on boiler pcb and com and No at receiver.

Edit:

 

[macka09]

Unless I have the wrong information, then it shows a live, neutral, common and normally open, which on your boiler setup is: live and neutral from your boiler terminals inside on the pcb. Your other 2 wires go to Ls and Lr on boiler pcb and com and No at receiver.

Edit:

View attachment 39017

That isn’t the info I have for it. I can’t seen to upload the picture.

 

[macka09]

This is all I can see.

 

[ShaunCorbs]

Ls to live
Ns to neutral
Link live to com
Lr to no

 

[Burger]

Ls to live
Ns to neutral
Link live to com
Lr to no

So does the neutral on the receiver use the boilers pcb Ns?

 

[ShaunCorbs]

So does the neutral on the receiver use the boilers pcb Ns?

Yes and designed for use on external controls

 

[Burger]

Yes and designed for use on external controls

Thank you - clears a few things up for me.