Nest 3rd Gen to replace Potterton EP2002, please check my workings out?

[sneakers]

At the moment I have:
Ideal W Gas boiler
Cold water tank in attic
Potterton EP2002 Programmer (can currently control CH & HW independently)
Honeywell 2 port valve next to boiler for CH
Honeywell 2 port valve next to HW cylinder with stat upstairs in the airing cupboard
Honeywell thermostat in sitting room

I'm pretty sure this means it's an S Plan system?

Wiring currently inside the EP2002:

potterton wiring

• sneakers
• 24 Sep 2016

The wiring diagram:

potterton guide

• sneakers
• 24 Sep 2016

I would like to incorporate the Nest 3rd Gen thermostat.

Due to the built in junction box I plan to remove the EP2002 and replace with a pattress box containing a choc block with the same connections as was in the EP2002. I'll then install the Heat Link box next to the pattress box passing the following wires to it:

New Wiring

• sneakers
• 24 Sep 2016

Heat Link wiring diagram:

nest wiring2

• sneakers
• 24 Sep 2016

Firstly is this going to work and secondly, is this a good way of going about it?

Thank you for your time.

 

[muggles]

You've got your ON and OFF connections the wrong way round

 

[hertsboilers]

You've got your ON and OFF connections the wrong way round

Hi Andrew but I think he is right?

OP, don't forget the blue wire from old 5 which is live, but don't know what is it for.

 

[muggles]

He's got his hot water ON connected to the Nest heating OFF, and his CH OFF to Nest hot water ON. Heating ON and hot water OFF are correct

 

[David Murphy]

Hi there. Just need some advise before I install the nest into my home.

To confirm
Nest 1 = CH off
Nest 3 = CH On
Nest 4 = HW Off
Nest 6 = HW On

Also if I have two wires in each terminal currently do both of them need to also share a terminal in the nest devise?

IMG_1326[1]

• David Murphy
• 8 Nov 2016

IMG_1328[1]

• David Murphy
• 8 Nov 2016

 

[zappermac]

At the moment I have:
Ideal W Gas boiler
Cold water tank in attic
Potterton EP2002 Programmer (can currently control CH & HW independently)
Honeywell 2 port valve next to boiler for CH
Honeywell 2 port valve next to HW cylinder with stat upstairs in the airing cupboard
Honeywell thermostat in sitting room

I'm pretty sure this means it's an S Plan system?

Wiring currently inside the EP2002:

potterton wiring

• sneakers
• 24 Sep 2016

The wiring diagram:

potterton guide

• sneakers
• 24 Sep 2016

I would like to incorporate the Nest 3rd Gen thermostat.

Due to the built in junction box I plan to remove the EP2002 and replace with a pattress box containing a choc block with the same connections as was in the EP2002. I'll then install the Heat Link box next to the pattress box passing the following wires to it:

New Wiring

• sneakers
• 24 Sep 2016

Heat Link wiring diagram:

nest wiring2

• sneakers
• 24 Sep 2016

Firstly is this going to work and secondly, is this a good way of going about it?

Thank you for your time.

Hello,

May i know which pattress box containing a choc block youve bought?
Thanks.