Nest wiring

[fergusfog]

Ah, gotcha.
There are zone valves there (see pic). The pump water flow is in the DOWN direction (surprising) and the zone valves are after/below that.

Untitled

• fergusfog
• 27 Feb 2015
• 1

Does that make sense?


The safety discharge is a lot of work though. It's been mentioned before, in the context of "I can't change anything without making that copper pipe, but that would require a new pipe through the bathroom = £££".

 

[Dean744PiN5]

that box in top right hand corner is the wiring center thats where your heat link needs to be fitted

that is your current setup.

you need to follow the s plan diagram in the nest manual.

 

[fergusfog]

Oh jees. Ok.
It seems like some of these random wires coming from the wall might be connecting to those zone valves then?

I'll check out that box, see what it has to say.

In the mean time I've asked more companies for quotes.

Every day's a learning day.

 

[fergusfog]

Okay, here's what I have upstairs. I've omitted the earth wires.

I guess the DHW switched live/call for heat would go into the other valve (which I didn't include as it's not used).
From your diagram, the brown wire from the valve seems to go to the DHW terminal (3) in the thermostat, but surely it should go to 4 in my case. Maybe I got it wrong.

Is it more obvious where I should plug in the Heat Link, and if I need to use the Common or Satisfied?

Untitled

• fergusfog
• 1 Mar 2015
• 1

 

[Dean744PiN5]

obviously liva and neautral to heat link then put a wire bridge between L and 2 on heat link then wire 3 from heat link to brown on motorised valve but disconnect and isolate the existing wire going to brown.

Just leave your timeclock connected it will be redundant but saves mucking about with it.

use the usb adaptor to power the nest itself don't worry about t1 and t2 no risk of blowing it up then.

 

[fergusfog]

Okay, how does this look?
I disconnect the yellow going to the valve and wrap lots of tape around the end.

Untitled

• fergusfog
• 1 Mar 2015
• 1

 

[Dean744PiN5]

thats it, but terminate that spare wire properly using a terminal connector, just because the rest of the installation looks like dog turd doesn't mean yours should

do it properly and safely and be the better person

 

[fergusfog]

Aye, fair enough. I'll try to do a better job than the last guy.

Many thanks again for your help. I'll try it in the morning and shout if I blow anything up.

 

[Dean744PiN5]

Many thanks again for your help. I'll try it in the morning and shout if I blow anything up.

this is where i put a disclaimer in....fook it up and its your own fault not some random plumber of the internet

 

[igneous]

Again someone treating this forum like a how to manual. Should call this cheapskate.com

 

[fergusfog]

Thanks igneous.

It's a fine line, I know, but I find it easier to learn from people with real life experience than from a manual.

And in my professional life I'm more than happy to help someone for, say, 2hrs when it would otherwise have taken him 10hrs to work it out himself.

F.

 

[Dean744PiN5]

maybe the forum should have a tip jar facility for when we go above and beyond with advice and save people the money of a professional call out

 

[Dean744PiN5]

btw did you get it working foggy?

 

[fergusfog]

I wouldn't be against that deano, although clearly if you did it yourself for money then you'd be liable. this way, I'm in the sheeeet.

So, I thought I'd tinker and investigate more, and I am still a little confused about the wiring.
You're rolling your eyes now, but I wanted to essentially unwire the current thermostat, and I've worked out which one that it.
Currently though, I did what I suggested at the beginning (directly replace the current controller with the Heat Link). I know, I'm a stubborn sod, but an inquisitive one. And it seems to be working.

However, I'm not sure it's not actually still beholden to the old thermostat so I need to work it out tomorrow.
Is this why you suggested putting it upstairs by the pump, because it would essentially then bypass the old thermostat?

Incidentally, the Nest Pro (find a pro installer via the website ) doesn't work too well. I've requested a quote from 6 companies and had one reply!

 

[Dean744PiN5]

I wouldn't be against that deano, although clearly if you did it yourself for money then you'd be liable. this way, I'm in the sheeeet.

fitted well over 30 units now, have a 5 star rating on nest pro site, would have had your job sussed in 10mins if i was on site and had the nest up an running within 30

but i get twitchy if i have to go inside the m25 even more so when its across the water.