I am just looking for some simple information which I can't find online anywhere. I have an old RD532i boiler and TR2 thermostat. The wires between them are labelled F, 3 and 4. Can anyone tell me which of those three wires are the neutral, the live and the switched live? (I think that's what they actually are)
TR2 thermostat wires - which is the neutral?
- Thread starter Sparkeee
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- rd532i thermostat wiring tr2
D
Deleted member 267285
You might not actually have a neutral, it could be low voltage. A photo may be useful.
Hi,
Are you trying to find out what the existing connections are between the two, or are you trying to connect them together?
If they are already connected (and if this is your model!), The wiring connections are listed on p.8 and p.22
Edit:
TR2's are low voltage only and should never be connected to the mains, hence the F, 3 and 4 labels
Are you trying to find out what the existing connections are between the two, or are you trying to connect them together?
If they are already connected (and if this is your model!), The wiring connections are listed on p.8 and p.22
Edit:
TR2's are low voltage only and should never be connected to the mains, hence the F, 3 and 4 labels
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I may be mistaken, but it sounds as if you are expecting the TR2 to behave as a simple thermostat, i.e. have a live, neutral and switched live (albeit having a low voltage equivalent).
Because the TR2 is fully integrated into the boiler, the wiring may (although I am unsure) be 0V, +V and Data.
It does not behave in the same way as a simple thermostat.
There is some further info here:
https://www.homeownershub.com/uk-diy/worcester-bosch-tr2-room-stat-reverse-engineered-428844-.htm
Why do you want to know what the wires do?
Because the TR2 is fully integrated into the boiler, the wiring may (although I am unsure) be 0V, +V and Data.
It does not behave in the same way as a simple thermostat.
There is some further info here:
https://www.homeownershub.com/uk-diy/worcester-bosch-tr2-room-stat-reverse-engineered-428844-.htm
Why do you want to know what the wires do?
It's to remove the TR2. And a pair of the wires need to be bridged. Believe me I have read all the articles and that one about the reverse engineering isn't clear. It talks about finding the resistance between two pairs of the 3 wires but without making it clear which is which.
I'm sorry, I uploaded the wrong manual for the boiler model you have.
Having read that, may I suggest you do the same?
All the information you need is there.
The article I linked to, did state which connections should be made to where.
However, this article is only relevant where the boiler has no means of external control and you wish to bypass the TR2.
Having read that, may I suggest you do the same?
All the information you need is there.
The article I linked to, did state which connections should be made to where.
However, this article is only relevant where the boiler has no means of external control and you wish to bypass the TR2.
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