24v myson ufh with nest thermostat

Niall70

Niall70

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Hi guys have 24v myson ufh manifold system set up with 2 zone with actuators. I want to control the zones with nest thermostats I have a cat 5 at the thermostat so that sides all good but I want to know what I need to run from the nest junction box to the manifold. Can anyone help? Cheers
 

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So you’ll need to pick up the permanent live and neutral supplies, 2 and 3 at Nest heatlink(s) to the live and switched at mpe222 and the 12v from room thermostat to the terminal strip.
 
Chris_W said:
So you’ll need to pick up the permanent live and neutral supplies, 2 and 3 at Nest heatlink(s) to the live and switched at mpe222 and the 12v from room thermostat to the terminal strip.
Click to expand...
Hi Chris sorry I attached wrong wiring diagram this is thr one?
 
Ok, not 100% on this, but you definitely need the permanent live an Neutral supplies for the heatlink to power up, then live and switched 24v to 2 and 3 on Nest, then either 2 core wire from nest stat to heatlink or use usb cable.
 
Chris_W said:
Ok, not 100% on this, but you definitely need the permanent live an Neutral supplies for the heatlink to power up, then live and switched 24v to 2 and 3 on Nest, then either 2 core wire from nest stat to heatlink or use usb cable.
Click to expand...
Thanks man that's what I was thinking so I'll give it a go with one and see
 
CBW said:
Ok, not 100% on this, but you definitely need the permanent live an Neutral supplies for the heatlink to power up, then live and switched 24v to 2 and 3 on Nest, then either 2 core wire from nest stat to heatlink or use usb cable.
Click to expand...

Hi Niall and Chris, I have the exact same situation at home. But just to confirm from your post: you don't connect the Neutral from the UFH Junction Box?

I attached a pdf with the suggested wire diagram.

Cheers,

Eric
 

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Sorry Eric, I’m confused, I haven’t said don’t use the neutral from the junction box?
 
CBW said:
Sorry Eric, I’m confused, I haven’t said don’t use the neutral from the junction box?
Click to expand...

Hi Chris, it was because I only read '...then live and switched 24v to 2 and 3 on Nest...' so I was wondering where to connect the third wire :)

I currently have three connections between my thermostat and wiring centre:

L(24v)
N(0v)
L Switch

So I assume I need to connect those 3 to the new Heat link.

L(24v) --> 2
N(0v) --> ?
L Switch --> 3

there are a lot of posts online about connecting a Heat link with a wiring centre, but it is all based on a 230V main connection instead of a 24V system.
 
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