Wiring Worcester 30i to TADO System

[gtechtwo]

Hoping one of the Guru's out there might help and put my mind at ease.

Background: Recently had a Worcester 30i installed by British Gas, they used a contracted electrician to do the wiring. He also wired in my Honeywell wireless heating controller.

Fast forward to current day and getting rid of Honeywell for Tado. Followed the guides, Installation guide & various video's to check and double check what I was doing.

when I removed the Honeywell receiver I noticed that there was 2 Blue and 2 Brown wires (N & L) twisted together and screwed into the Honeywell. Never thought much about it and did likewise with the Tado receiver, so we have 2 x N & 2 x L.

Onto the Boiler: On dropping the back panel, I see one cable that goes to N & L 230V IN and then the Grey and Black coming out of the same cable, into the relevant locations. There is ONLY 1 cable coming into the back of the boiler and this is it.

Removed the links on the boiler, Moved the N & L over to the OUTPUT Side.

Now as far as I know everything is working as it should, I can control each room (Tado TRV)

But laying in bed and pondering the day, it occurred to me that what I think they have done, instead of running a cable from the fused spur UP to the boiler and installed on the INPUT side, Then another cable from Honeywell to the Input side, they have gone from Fused spur across to the Honeywell and then the one cable similar to what is supplied with Tado, went up to the boiler.

The techie in my tells me to take out all the wiring and start again and do it correctly, but if its working I dont want to cause myself issues, so couple of questions come to mind:

1. I assume the fused spur SHOULD be supplying the boiler with its AC Power unless there is power coming from elsewhere.
2. How the heck was it working before, and now??

Not sure what to do for the best so open to suggestions.

Would really appreciate some advice on this.

 

[stem]

If I read your post correctly, your concern is with the 230V supply and as I understand it from your description, that the mains power supply is wired as per my sketch below. If so, that's fine because the same fused connection unit will isolate the entire heating system. It doesn't matter if the L & N is introduced at the thermostat or boiler. Electrically speaking it's exactly the same thing.

My only comment would be that if the FCU isn't physically near the boiler, then a separate isolator should really be installed adjacent to the boiler for isolation during maintenance.

If I have misunderstood your description please post back.

 

[ianmcd]

post some pics of the wiring please

 

[gtechtwo]

@stem

If I read your post correctly, your concern is with the 230V supply and as I understand it from your description, that the mains power supply is wired as per my sketch below. If so, that's fine because the same fused connection unit will isolate the entire heating system. It doesn't matter if the L & N is introduced at the thermostat or boiler. Electrically speaking it's exactly the same thing.

View attachment 249975

My only comment would be that if the FCU isn't physically near the boiler, then a separate isolator should really be installed adjacent to the boiler for isolation during maintenance.

If I have misunderstood your description please post back.

You got it spot on what I was trying to say. The FCU is near the boiler as is the Wireless Receiver, so all very handy. Really appreciate he time you took to respond. Many thanks

 

[gtechtwo]

post some pics of the wiring please

Below is the pic as to how see it, and I am hoping I have wired up everything as it should be:

I have seen video's of 2 different installs to the Worcester 30i with the Tado Wireless controller, and both had different wiring variations, hence the confusion about it all.

Many thanks

 

[ianmcd]

yes that is correct

 

[gtechtwo]

Below is the pic as to how see it, and I am hoping I have wired up everything as it should be:

View attachment 249991

I have seen video's of 2 different installs to the Worcester 30i with the Tado Wireless controller, and both had different wiring variations, hence the confusion about it all.

Many thanks

you mean I actually got something correct........ Very unusual for me, more down to lack of confidence than anything else. Many thanks to you both for responding to the request, very much appreciated.