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Discuss Wiring a salus t105rf to older Worcester ?? in the Central Heating Forum area at PlumbersForums.net

macka09

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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.
 

CBW1982

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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.
 
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macka09

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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?
 

CBW1982

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

07FA0A14-9400-4A12-9CC9-DA6551FC5955.jpeg
 
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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.
 
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macka09

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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?
 
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macka09

Plumber
GSR
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988
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58
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?
 

CBW1982

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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.
 
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macka09

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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
 

CBW1982

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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:

34FF0121-425D-47DA-9E3F-2629BCF9DD53.jpeg
 
Last edited:
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macka09

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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.
 

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