Replace Potterton EP6002 HW+CH programmer with a Wiser Heat Hub

[jparmar91]

Hi all. I am replacing and old Potterton EP6002 with a Drayton Wiser Heat Hub kit.

The property uses a system boiler setup which consists of a boiler in the kitchen, cylinder in the airing cupboard and a room thermostat in the hallway. The current Potterton programmer allows me to control the hot water and central heating separately.

I haven't done this type of DIY before and my only challenge here is identifying the old wiring of the Potterton EP6002 and migrating to the new Wiser hub. Can anybody offer some advice on how to proceed?

This is what my wiring currently looks like:

The Wiser Heat Hub wiring diagram:

Many thanks in advance for any replies!

 

[RandomGrinch]

The EP6002 is designed to take over some of the functions of a separate wiring centre - this is why there are some extra terminals occupied with wiring, that won't be available on the Wiser.
This shouldn't be a problem, but a bit more care needs to be taken.

Could you show us the wiring behind the old thermostat?
If we can work out where that joins to the EP6002, the old stat could be decommissioned and that would make the wiring slightly simpler.

Also, could we have a photo of the back of the EP6002, I just want to be sure that there isn't a rotating switch set to gravity mode on the back.